Petrology, (isotope)geochemsitry and (ore)mineralogy of alkaline rocks and carbonatites. Several field-based studies on occurrences in Greenland (Gadar Province), Morocco (Tamazeght Complex), Canada (Mont St. Hilaire), Sweden (Norra Kärr), South Africa (Palabora), Russia (Kola Peninsula), and Germany (Katzenbuckel, Urach, Hegau, Kaiserstuhl) with various international cooperations.

• Experimental investigation of phase-stabilities and differentiation trends in peralkaline magmas (cooperation with Marcus Nowak).

• Halogen (F, Cl, Br) and volatile (C, N, S) systematics of magmatic rocks (granitoids, alkaline rocks, carbonatites) and minerals (apatite, mica, amphibole, sodalite, eudialyte).

• Development of microanalytical standards for halogen (F,Cl,Br) analyses (cooperation with Mark Kendrick, Nelson Ebby, Thomas Zack and Thomas Wenzel).

• Geochemistry of apatite from igneous rocks and its use for deciphering magmatic and hydrothermal processes.

• Geochemical and petrological investigations of tourmaline occurrences associated with granitoid rock from SW England (Carnwall) and SW Germany (Schwarzwald).

• Geochemistry and stable isotope composition of pyromorphite-group minerals and their use as recorder for supergene weathering processes in hydrothermal Pb deposits.

• Composition of fluid inclusions from hydrothermal ore deposits and in mine waters (using crush-leach techniques combined with Ion Chromatography and Total Reflection X-Ray Fluorescence Analysis).

• The influence of HFSE-rich mineral fractionation on the geochemical evolution of silicate melts.

• Lithium isotope fractionation in alkaline magmatic systems (cooperation with Roberta Rudnick).

• Development of microanalytical standards for Li isotope analyses (cooperation with Horst Marschall, Thomas Zack, Thomas Ludwig, Roberta Rudnick, Bill McDonough, Ralf Halama, Detlef Rost, Ed Vicenzi).

• Retention and alteration of oxygen and hydrogen isotope systematics in magmatic systems (cooperation with Torsten Vennemann).

• Ion microprobe in situ U-Pb dating of accessory minerals (zircon, titanite) of Cenozoic volcanic rocks of the German Rhine Graben Province (cooperation with Axel Schmitt).

Rock identification (“Schotterkurs”)

This 2 SWS exercise (held during the wintersemester) provides basic knowledge in identifying the major rock forming minerals and identifying and naming major rock types.

1993–1995: B.Sc. in Chemistry, Albert-Ludwigs-University, Freiburg

1996–1999: M.Sc. studies in Mineralogy, Institut für Mineralogie, Petrologie und Geochemie, University of Freiburg.

1999: M.Sc. in Mineralogy. M.Sc. thesis: Phase Equilibria and intrinsic parameters of the augite syenite unit of the Ilímaussaq Intrusion, South Greenland

2000–2003: Ph.D. candidate, Eberhard-Karls-University, Tübingen, Germany

2003: Ph.D.in Mineralogy. Ph.D. thesis: Petrological and geochemical investigations of alkaline, peralkaline and agpaitic magmatic series of the mid-Proterozoic Gardar Province, south Greenland

2004–2008: Post-doctoral fellow, Eberhard-Karls-University, Tübingen, Germany

since 2009: Akademischer Rat, Eberhard-Karls-University, Tübingen, Germany

2015: Habilitation in Mineralogy, Petrology and Geochemistry. Thesis title: Petrology and geochemistry of igneous and hydrothermal rocks.

Deutsche Mineralogische Gesellschaft (DMG)

Mineralogical Society of America (MSA)

European Association of Geochemistry (EAG)

O'Driscoll, B., Petronis, M.S., Marks, M.A.W., McCarthy, W.S., Mariani, E., Stevenson, C.T.E., Clay, P.L. & Geissman, J.W. (2024): Magnetic Fabrics in Laminated Rocks of the Ilímaussaq Igneous Complex, Southern Greenland. The Canadian Journal of Mineralogy and Petrology.

Han, P.-Y., Rudnick, R. L., Hu, Z.-C., He, T., Marks, M.A.W. & Chen, K. (2024): Halogen enrichment on the continental surface: a perspective from loess. Geochemical Perspectives Letters 32, 52–57.

Alam, N., Husain, M. A., Singh, R., Jain, P. K., Eiche, E., Neidhardt. H., Marks, M., Kumar, M. & Biswas, A. (2024): Geochemistry of fluoride mobilization in the hard-rock aquifers of central India: Implication for fluoride-safe drinking water supply. Applied Geochemistry 171, 106106.

Binder, T., Marks, M.A.W., Walter, B.F., Wenzel, T. & Markl, G. (2024): Two Distinct Metasomatized Mantle Sources Produced Two Groups of Alkaline SiO₂-undersaturated Rocks in the Southern Central European Volcanic Province. Journal of Petrology 65 (7), egae070.

Bongiovanni, M., Fusswinkel, T. & Marks, M.A.W. (2024): Unravelling the effects of magmatic fractionation, fluid phase separation and dilution on the composition of magmatic hydrothermal fluids of the Cornubian Batholith (SW England). Chemical Geology 658, 122119.

Binder, T., Marks, M.A.W., Friedrichsen, B.-E., Walter, B.F., Wenzel, T. & Markl, G. (2024): Bimodal volcanism in the Hegau region (SW Germany): Differentiation of primitive melilititic to nephelinitic rocks produces evolved nosean phonolites. Lithos 472-473, 107565 (23 p.).

Gudelius, D., Marks, M.W., Markl, G., Nielsen, T.F.D., Kolb, J. & Walter, B. (2023): The Origin of Ultramafic Complexes with Melilitolites and Carbonatites: A Petrological Comparison of the Gardiner (E Greenland) and Kovdor (Russia) Intrusions. Journal of Petrology 64, 1–26.

Binder, T., Marks, M.A.W., Gerdes, A., Walter, B.F., Grimmer, J., Beranoaguirre, A., Wenzel, T. & Markl, G. (2023): Two distinct age groups of melilitites, foidites, and basanites from the southern Central European Volcanic Province reflect lithospheric heterogeneity. International Journal of Earth Sciences 112, 881–905.

Kendrick, M. A., Marks, M.A.W. & Godard, M. (2022): Halogens in serpentinised-troctolites from the Atlantis Massif: implications for alteration and global volatile cycling. Contributions to Mineralogy and Petrology 77, 110 (18p.).

Han, P.-Y., Rudnick, R.L., He, T., Marks, M.A.W., Wang S.-J., Gaschnig, R.M., & Hu, Z.-C. (2022): Halogen (F, Cl, Br, and I) concentrations of the upper continental crust through time as recorded in ancient glacial diamictite composites. Geochimica et Cosmochimica Acta 341, 28–45.

Walter, B.F., Giebel., R.J., Marlow, A.G., Siegfried, P.R., Marks, M., Markl, G., Palmer, M. & Kolb, J. (2022): The Kieshöhe carbonatites of southwestern Namibia – the post-magmatic role of silicate xenoliths on REE mobilisation. Communications of the Geological Survey of Namibia 25, 1–31.

Eggenkamp, H.G.M., Marks, M.A.W., Bonifacie, M., Bardoux, G., Agrinier, P. & Markl, G. (2022): Cl isotope fractionation in magmatic and hydrothermal eudialyte, sodalite and tugtupite (Ilímaussaq intrusion, South Greenland). Chemical Geology 604, 120932 (12 p.).

Chmyz, L., Guitarrari Azzone, R., Ruberti, E., Marks, M.A.W. & Saraiva dos Santos, T.J. (2022): Olivines as probes into assimilation of silicate rocks by carbonatite magmas: Unraveling the genesis of reaction rocks from the Jacupiranga alkaline‑carbonatite complex, southern Brazil. Lithos 416–417, 106647 (18 p.).

Epp, T., Marks, M.A.W., Neidhardt, H., Oelmann, Y. & Markl, G. (2022): Halogen (F, Cl, Br, I) contents in silt and clay fractions of a Cambisol from a temperate forest. American Mineralogist 107 (5), 946–954.

Neidhardt, H., Lemke, E., Epp, T., Marks, M.A.W., Markl, G. & Oelmann, Y. (2022): Impact of abiotic and biogeochemical processes on halogen concentrations (Cl, Br, F, I) in mineral soil along a climatic gradient. Environmental Science: Processes & Impacts, Advance Article (13 p.) (for electronic supplementary information see here).

Zaitsev, A.N., Arzamastsev, A.A., Marks, M.A.W., Braunger, S., Wenzel, T., Spratt, J., Salge, T. & Markl, G. (2021): Hybridization of Alkali Basaltic Magmas: a Case Study of the Ogol Lavas from the Laetoli Area, Crater Highlands (Tanzania). Journal of Petrology 62 (8), 1–37.

Hoare, B.C., Tomlinson, E.L., Barnes, J.D., Tappe, S., Marks, M.A.W., Epp, T., Caulfield, J. & Riegler, T. (2021): Tracking halogen recycling and volatile loss in kimberlite magmatism from Greenland: Evidence from combined F-Cl-Br and δ³⁷Cl systematics. Lithos 384–385, 105976 (18 p.).

Braunger, S., Scharrer, M., Marks, M.A.W., Wenzel, T. & Markl, G. (2021): Interaction Between Mafic Dike Rocks and Salt Deposits in the Rhine Graben, Southwest Germany. The Canadian Mineralogist 59 (3), 511–531.

Braunger, S., Marks, M.A.W., Wenzel, T., Zaitsev, A. N. & Markl, G. (2021): The Petrology of the Tarosero Volcanic Complex: Constraints on the Formation of Extrusive Agpaitic Rocks. Journal of Petrology 62 (6), 1–34.

Hutchison, W., Finch, A.A., Borst, A.M., Marks, M.A.W., Upton, B.G.J., Zerkle, A.L., Stüeken, E.E. & Boyce, A.J. (2021): Mantle sources and magma evolution in Europe’s largest rare earth element belt (Gardar Province, SW Greenland): New insights from sulfur isotopes. Earth and Planetary Science Letters 568, 117034 (16 p.).

Eggenkamp, H.G.M., Marks, M.A.W., Louvat, P. & Markl, G. (2021): Bromine Isotope Variations in Magmatic and Hydrothermal Sodalite and Stimation of Br Isotope Fractionation between Melt and Sodalite. Minerals 11 (4), 370 (9 p.).

Ladenburger, S., Walter, B.F., Marks, M.A.W. & Markl, G. (2020): Combining Ion Chromatography and Total Reflection X-ray Fluorescence for Detection of Major, Minor and Trace Elements in Quartz-Hosted Fluid Inclusions. Journal of Analytical Chemistry 75 (11): 1477–1485.

Marks, M.A.W., Eggenkamp, H.G.M., Atanasova, P., Mundel, F., Kümmel, S., Hagen, M., Wenzel, T. & Markl, G. (2020): Review on the Compositional Variation of Eudialyte-Group Minerals in the Ilímaussaq Complex (South Greenland). Minerals 10, 1011 (18 p.).

Eggenkamp, H.G.M., Marks, M.A.W., Atanasova, P., Wenzel, T. & Markl, G. (2020): Changes in Halogen (F, Cl, Br, and I) and S Ratios in Rock-Forming Minerals as Monitors for Magmatic Differentiation, Volatile-Loss, and Hydrothermal Overprint: The Case for Peralkaline Systems. Minerals 10, 995 (23 p.).

Epp, T., Neidhardt, H., Pagano, N., Marks, M.A.W., Markl, G. & Oelmann, Y. (2020): Vegetation canopy effects on total and dissolved Cl, Br, F and I concentrations in soil and their fate along the hydrological flow path. Science of the Total Environment 712, 135473.

Braunger, S., Marks, M.A.W., Wenzel, T., Chmyz, L., Guitarrari Azzone, R. & Markl, G. (2020): Do carbonatites and alkaline rocks reflect variable redox conditions in their upper mantle source? Earth and Planetary Science Letters 533, 116041.

Atanasova, P., Marks, M.A.W., Frenzel, M., Gutzmer, J., Krause, J. & Markl, G. (2020): Fractionation of geochemical twins (Zr/Hf, Nb/Ta and Y/Ho) and HREE-enrichment during magmatic and metamorphic processes in peralkaline nepheline syenites from Norra Kärr (Sweden). Lithos 372–373, 105667.

Hecker, G. J., Marks, M.A.W., Wenzel, T. & Markl, G. (2020): Halogens in amphibole and mica from mantle xenoliths: Implications for the halogen distribution and halogen budget of the metasomatized continental lithosphere. American Mineralogist 105 (6), 781–794.

Walter, B. F., Steele-MacInnis, M., Giebel, R. J., Marks, M.A.W. & Markl, G. (2020): Complex carbonate-sulfate brines in fluid inclusions from carbonatites: Estimating compositions in the system H₂O-Na-K-CO₃-SO₄-Cl. Geochimica et Cosmochimica Acta 277, 224–242.

Epp, T., Marks, M.A.W., Ludwig, T., Kendrick, M. A., Eby, N., Neidhardt, H., Oelmann, Y. & Markl, G. (2019): Crystallographic and fluid compositional effects on the halogen (Cl, F, Br, I) incorporation in pyromorphite-group minerals. American Mineralogist 104, 1673–1688.

Hutchinson, W., Babiel, R.J., Finch, A.A., Marks, M.A.W., Markl, G., Boyce, A.J., Stüeken, E.E., Friis, H., Borst, A.M. & Horsburgh, N.J. (2019): Sulphur isotopes of alkaline magmas unlock long-term records of crustal recycling on Earth. Nature Communications 10, 4208.

Dietzel, C.A.F., Kristandt, T., Dahlgren, S., Giebel, R.J., Marks, M.A.W., Wenzel, T. & Markl, G. (2019): Hydrothermal processes in the Fen carbonatite complex, southern Norway. Ore Geology Reviews 111, 102969.

Giebel, R.J., Parsapoor, A., Walter, B., Braunger, S., Marks, M.A.W., Wenzel, T. & Markl, G. (2019): Evidence for magma – wall rock interaction in carbonatites from the Kaiserstuhl Volcanic Complex (Southwest Germany ). Journal of Petrology 60 (6), 1163–1194.

Banks, G.J., Walter, B.F., Marks, M.A.W. & Siegfried, P.R. (2019): A Workflow to Define, Map and Name A Carbonatite-or Alkaline Igneous-Associated REE-HFSE Mineral System: A Case Study from SW Germany. Minerals 9 (2), 97 (28 p.).

Giebel, R.J., Marks, M.A.W., Gauert, C.D.K. & Markl, G. (2019): A model for the formation of carbonatite-phoscorite assemblages based on the compositional variations of mica and apatite from the Palabora Carbonatite Complex, South Africa. Lithos 324–325, 89–104.

Braunger, S., Marks, M.A.W., Walter, B.F., Neubauer, R., Reich, R., Wenzel, T., Parsapoor A. & Markl, G. (2018). The Petrology of the Kaiserstuhl Volcanic Complex, SW Germany: The Importance of Metasomatized and Oxidized Lithospheric Mantle for Carbonatite Generation. Journal of Petrology 59 (9), 1731–1762.

Walter B.F., Parsapoor A., Braunger S., Marks M.A.W., Wenzel T., Martin M. & Markl G. (2018): Pyrochlore as a monitor for magmatic and hydrothermal processes in carbonatites from the Kaiserstuhl volcanic complex (SW Germany). Chemical Geology 498, 1–16.

Babiel, R., Marks, M.A.W., Neumann, U. & Markl, G. (2018): Sulfides in alkaline and peralkaline rocks: textural appearance and compositional variations. Neues Jahrbuch Mineralogie – Abhandlungen 195, 155–175.

Wang, L.-X., Ma, C.-Q., Zhang, C., Zhu, Y.-X. & Marks, M.A.W. (2018): Halogen geochemistry of I- and A-type granites from Jiuhuashan region (South China): Insights into the elevated fluorine in A-type granite. Chemical Geology 478, 165–182.

Walter, B.F., Burisch, M., Fusswinkel, T., Marks, M.A.W., Steele-MacInnis, M., Wälle, M., Apukhtina, O. & Markl, G. (2018): Multi-reservoir fluid mixing processes in rift-related hydrothermal veins, Schwarzwald, SW-Germany. Journal of Geochemical Exploration 186, 158–186.

Elliott, H.A.L., Wall, F., Chakhmouradian, A.R., Siegfried, P.R., Dahlgren, S., Weatherley, S., Finch, A.A., Marks, M.A.W., Dowman, E. & Deady, E. (2018): Fenites associated with carbonatite complexes: A review. Ore Geology Reviews 93, 38–59.

Marks, M.A.W., Kendrick, M.A., Eby, G.N., Zack, T. & Wenzel, T. (2017): Reply to “Comment on The F, Cl, Br and I contents of reference glasses BHVO-2G, BIR-1G, BCR-2G, GSD-1G, GSE-1G, NIST SRM 610 and NIST SRM 612“. Geostandards and Geoanalytical Research 41, 475–478.

Marks, M.A.W. & Markl, G. (2017): A global review on agpaitic rocks. Earth-Science Reviews 173, 229–258.

Giebel, R.J., Gauert, C.D.K., Marks, M.A.W., Costin, G. & Markl, G. (2017): Multi-stage formation of REE minerals in the Palabora Carbonatite Complex, South Africa. American Mineralogist 102, 1218–1233.

Atanasova, P., Marks, M. A. W., Heining, T., Krause, J., Gutzmer, J. & Markl, G. (2017): Distinguishing magmatic and metamorphic processes in peralkaline rocks of the Norra Kärr complex (Southern Sweden) using textural and compositional variations of clinopyroxene and eudialyte-group minerals. Journal of Petrology 58, 361–384.

Zhang, C., Wang, L.X., Marks, M.A.W., France, L. & Köpke, J. (2017): Volatiles (CO2, S, F, Cl, Br) in the dike-gabbro transition zone at IODP Hole 1256D: Magmatic imprint versus hydrothermal influence at fast-spreading mid-ocean ridge. Chemical Geology 459, 43–60.

Marks, M.A.W., Kendrick, M.A., Eby, G.N., Zack, T. & Wenzel, T. (2017): The F, Cl, Br and I Contents of reference glasses BHVO-2G, BIR-1G, BCR-2G, GSD-1G, GSE-1G, NISTSRM 610 and NIST SRM 612. Geostandards and Geoanalytical Research 41, 107–122.

Duchoslav, M., Marks, M.A.W., Drost, K., McCammon, C., Marschall, H.R., Wenzel, T. & Markl, G. (2017): Changes in tourmaline composition during magmatic and hydrothermal processes leading to tin-ore precipitation: The Cornubian Batholith, SW England. Ore Geology Reviews 83, 215–234.

Wang, L.-X., Marks, M.A.W., Wenzel, T. & Markl, G. (2016): Halogen-bearing minerals from the Tamazeght Complex (Morocco): Constraints on halogen distribution and evolution in alkaline to peralkaline magmatic systems. The Canadian Mineralogist 54, 1347–1368.

Zahoransky, T., Friis, H. & Marks, M.A.W. (2016): Luminescence and tenebrescence of natural sodalites: a chemical and structural study. Physics and Chemistry of Minerals 43, 459–480.

Marks, M.A.W., Scharrer, M., Ladenburger, S. & Markl, G. (2016): Comment on "Apatite: A new redox Proxy for silicic Magmas?" (Geochimica et Cosmochimica Acta 132 (2014), 101-119). Geochimica et Cosmochimica Acta 183, 267–270.

Burisch, M., Marks, M.A.W., Nowak, M. & Markl, G. (2016): The effect of temperature and cataclastic deformation on the composition of upper crustal fluids - An experimental approach. Chemical Geology 433, 24–35.

Ladenburger, S., Marks, M.A.W., Upton, B., Hill, P., Wenzel, T. & Markl, G. (2016): Compositional Variation of Apatite from rift-related alkaline igneous rocks of the Gardar Province, south Greenland. The American Mineralogist 101, 612–626.

Wang, L.-X., Ma, C.-Q., Lai, Z.-X., Marks, M.A.W., Zhang, C. & Zhong, Y.-F. (2015): Early Jurassic mafic dykes from the Xiazhuang ore district (South China): Implications for tectonic evolution and uranium metallogenesis. Lithos 239, 71–85.

Ratschbacher, B.C., Marks, M.A.W., Bons, P.D., Wenzel, T. & Markl, G. (2015): Emplacement and geochemical evolution of highly evolved syenites investigated by a combined structural and geochemical field study: The lujavrites of the Ilímaussaq complex, SW Greenland. Lithos 231, 62–76.

Marks, M.A.W. & Markl, G. (2015): The Ilímaussaq alkaline complex, South Greenland. In: Charlier, B., Namur, O., Latypov, R., Tegner, C. (eds.) Layered Intrusions, pp.649-691. Springer Geology, Dordrecht (2015).

Zirner, A.L.K., Marks, M.A.W., Wenzel, T., Jacob, D.E. & Markl, G. (2015): Rare Earth Elements in apatite as a monitor of magmatic and metasomatic processes: the Ilímaussaq complex, South Greenland. Lithos 228-229, 12–22.

Lindhuber, M.J., Marks, M.A.W., Bons, P.D., Wenzel, T. & Markl, G. (2015): Crystal mat-formation as an igneous layering-forming process: Textural and geochemical evidence from the 'lower layered' nepheline syenite sequence of the Ilímaussaq complex, South Greenland. Lithos 224–225, 295–309.

Teiber, H., Marks, M.A.W., Arzamatsev, A.A., Wenzel, T. & Markl, G. (2015): Compositional variation in apatite from various host rocks: clues with regards to source composition and crystallization conditions. Neues Jahrbuch Mineralogie – Abhandlungen 192, 151–167.

Teiber, H., Scharrer, M., Marks, M.A.W., Arzamatsev, A.A., Wenzel, T. & Markl, G. (2015): Equilibrium partitioning and subsequent re-distribution of halogens among apatite-biotite-amphibole assemblages from mantle-derived plutonic rocks: Complexitites revealed. Lithos 220–223, 221–237.

Bons, P.D., Baur, A., Elburg, M.A., Lindhuber, M.J., Marks, M.A.W., Soesso, A., van Miligen, B.P. & Walte, N. (2015): Layered intrusions and traffic jams. Geology 43, 71–74.

Giehl, C., Marks, M.A.W. & Nowak, M. (2014): An experimental study on the influence of fluorine and chlorine on phase relations in peralkaline phonolitic melts. Contributions to Mineralogy and Petrology 167, 977.

Huq, F., Haderlein, S.B., Schröder, C., Marks, M.A.W. & Grathwohl, P. (2014): Effect of injected CO₂ on geochemical alteration of the Altmark gas reservoir in Germany. Environmental Earth Sciences 72, 3655–3662.

Wang, L.-X., Ma, C.-Q., Zhang, C., Zhang, J.-Y. & Marks, M.A.W. (2014): Genesis of leucogranite by prolonged fractional crystallization: A case study from the Mufushan complex, South China. Lithos 206–207, 147–163.

Wang, L.-X., Marks, M.A.W., Wenzel, T., von der Handt, A., Keller, J., Teiber, H. & Markl, A. (2014): Apatites from the Kaiserstuhl Volcanic Complex, Germany: new constraints on the petrogenetic relationship between carbonatite and associated silicate rocks. European Journal of Mineralogy 26, 397–414.

Wang, L.-X., Marks, M.A.W., Keller, J. & Markl, A. (2014): Halogen variations in alkaline rocks from the Upper Rhine Graben (SW Germany): Insights into F, Cl and Br behavior during magmatic processes. Chemical Geology 380, 133–144.

Markl, G., Marks, M.A.W., Holzäpfel, J. & Wenzel, T. (2014): Major, minor and trace element composition of pyromorphite-group minerals as a recorder of supergene weathering processes from the Schwarzwald mining district, SW Germany. American Mineralogist 99, 1133–1146.

Teiber, H., Marks, M.A.W., Wenzel, T., Siebel, W., Altherr, R. & Markl, G. (2014): The distribution of halogens (F, Cl, Br) in granitoid rocks. Chemical Geology 374–375, 92–109.

Hettmann, K., Marks, M.A.W., Kreissig, K., Zack, T., Wenzel, T., Rehkämper, M., Jacob, D.E. & Markl, G. (2014): The geochemistry of Tl and its isotopes during magmatic and hydrothermal processes: The peralkaline Ilímaussaq complex, southwest Greenland. Chemical Geology 366, 1–13.

Markl, G., Marks, M.A.W., Derrey, I. & Gühring, J.-E. (2014): Weathering of cobalt arsenides: Natural assemblages and calculated stability relations among secondary Ca-Mg-Co arsenates and carbonates.  American Mineralogist 99, 44–56.

Mangler, M.F., Marks, M.A.W., Zaitzev, A.N., Eby, G.N. & Markl, G. (2014): Halogens (F, Cl and Br) at Oldoinyo Lengai volcano (Tanzania): Effects of magmatic differentiation, silicate–natrocarbonatite melt separation and surface alteration of natrocarbonatite. Chemical Geology 365, 43–53.

Burmann, F., Keim, M.F., Oelmann, Y., Teiber, H., Marks, M.A.W. & Markl, G. (2013): The source of phosphate in the oxidation zone of ore deposits: Evidence from oxygen isotope compositions of pyromorphite. Geochimica et Cosmochimica Acta 123, 427–439.

Marks, M.A.W., Marschall, H.R., Schühle, P., Guth, A., Wenzel, T., Jacob, D.E., Barth, M. & Markl, G. (2013): Trace element systematics of tourmaline in pegmatitic and hydrothermal systems from the Variscan Schwarzwald (Germany): The importance of major element composition, sector zoning, and fluid or melt composition. Chemical Geology 344, 73–90.

Giehl, C., Marks, M.A.W. & Nowak, M. (2013): Phase relations and liquid lines of descent of an iron-rich peralkaline phonolitic melt: en experimental study. Contributions to Mineralogy and Petrology 165, 83–304.

Zaitsev, A.N., Marks, M.A.W., Wenzel, T., Spratt, J., Sharygin, V.V., Strekopytov, S. & Markl, G. (2012): Mineralogy, geochemistry and petrology of the phonolitic to nephelinitic Sadiman volcano, Crater Highlands, Tanzania. Lithos 152, 66–83.

Hettmann, K., Wenzel, T., Marks, M. & Markl, G. (2012): The sulfur speciation in S-bearing minerals: New constraints by a combination of electron microprobe analysis and DFT calculations with special reference to sodalite-group minerals. American Mineralogist 97, 1653–1661.

Huq, F., Blum, P., Marks, M.A.W., Nowak, M., Haderlein, S.B. & Grathwohl, P. (2012): Chemical changes in fluid composition due to CO2 injection in the Altmark gas field: preliminary results from batch experiments. Environmental Earth Sciences Environmental Earth Sciences 67, 385–394.

Marks, M.A.W., Wenzel, T., Whitehouse, M.J., Loose, M., Zack, T., Barth, M., Worgard, L., Krasz, V., Eby, G.N., Stosnach, H. & Markl, G. (2012): The volatile inventory (F, Cl, Br, S, C) of magmatic apatite: An integrated analytical approach. Chemical Geology 291, 241–255.

Schilling, J., Marks, M.A.W., Wenzel, T., Vennemann, T., Horvárth, L., Tarassoff, P., Jacob, D. & Markl, G. (2011): The Magmatic to Hydrothermal Evolution of the Intrusive Mont Saint-Hilaire Complex: Insights into the Late-stage Evolution of Peralkaline Rocks. Journal of Petrology 52, 2147–2185.

Kaliwoda, M, Marschall, H. R., Marks, M.A.W., Ludwig, T., Altherr, R. & Markl, G. (2011): Boron and boron isotope systematics in the peralkaline Ilímaussaq intrusion (South Greenland) and its granitic country rocks: A record of magmatic and hydrothermal processes. Lithos 125, 51–64.

Schilling, J., Wu, F.-Y., McCammon, C., Wenzel, T., Marks, M.A.W., Pfaff, K., Jacob, D.E. & Markl, G. (2011): The compositional variability of eudialyte-group minerals. Mineralogical Magazine 75, 87–115.

Marks, M.A.W., Hettmann,. K., Schilling, J., Frost, B.R. & Markl, G. (2011): The mineralogical diversity of alkaline igneous rocks: Critical factors for the transition from miaskitic to agpaitic phase assemblages. Journal of Petrology 52, 439–455.

Schilling, J., Marks, M.A.M, Wenzel, T., Vennemann, T., Horváth, L., Tarassoff, P., Jacob, D.E. & Markl, G. (2011): The Magmatic to Hydrothermal Evolution of the Intrusive Mont Saint-Hilaire Complex: Insights into the Late-stage Evolution of Peralkaline Rocks. Journal of Petrology 52 (11), 2147–2185.

Schilling, J., Frost, B.R., Marks, M.A.W., Wenzel, T. & Markl, G. (2011): Fe-Ti oxide-silicate (QUIlF-type) equilibria in feldspathoid-bearing systems. American Mineralogist 96, 100–110.

Markl, G., Marks, M.A.W. & Frost, B.R. (2010): On the controls of oxygen fugacity in the generation and crystallization of peralkaline melts. Journal of Petrology 51, 1831–1847.

Wu, Fu-Yuan, Yang, Yue-Heng, Marks, Michael A.W., Liu, Zhi-Chao, Zhou, Qin, Ge, Wen-Chun, Yang, Jing-Sui, Zhao, Zi-Fu, Mitchell, Roger H. & Markl, G. (2010): In situ U–Pb, Sr, Nd and Hf isotopic analysis of eudialyte by LA–(MC)–ICP–MS. Chemical Geology 273, 8–34.

Pfaff, K., Wenzel, T., Schilling, J., Marks, M.A.W. & Markl, G. (2010): A fast, easy-to-use approach to formula calculation for eudialyte-group minerals. Neues Jahrbuch für Mineralogie 187 (1), 69–81.

Marks, M.A.W., Neukirchen, F., Vennemann, T. & Markl, G. (2009): Textural, chemical, and isotopic effects of late-magmatic carbonatitic fluids in the carbonatite-syenite Tamazeght complex, High Atlas Mountains, Morocco. Mineralogy and Petrology 97, 23–42.

Schilling, J., Marks, M.A.W., Wenzel, T. & Markl, G. (2009): Reconstruction of magmatic to subsolidus processes in an agpaitic system using eudialyte textures and composition: A case study from Tamazeght, Morocco. The Canadian Mineralogist 47, 351–365.

Marks, M.A.W., Coulson, I.A., Schilling, J., Jacob, D.E., Schmitt, A.K. & Markl, G. (2008): The effect of titanite and other HFSE-rich mineral (Ti-bearing andradite, zircon, eudialyte) fractionation on the geochemical evolution of silicate melts. Chemical Geology 257, 153–172.

Pfaff, K., Krumrei, T., Marks, M., Wenzel, T., Rudolf, T. & Markl, G. (2008): Chemical and physical evolution of the ‘lower layered sequence’ from the nepheline syenitic Ilímaussaq intrusion, south Greenland: implications for the origin of magmatic layering in peralkaline felsic liquids. Lithos 106, 280–296.

Schoenberg, R., Marks, M.A.W., Schuessler, J.A., von Blanckenburg, F. & Markl, G. (2008): Fe isotope systematics of coexisting amphibole and pyroxene in the alkaline igneous rock suite of the Ilímaussaq Complex, South Greenland. Chemical Geology. Chemical Geology 258, 65–77.

Marks, M.A.W., Schilling, J., Coulson, I.M., Wenzel, T. & Markl, G. (2008): The Alkaline-Peralkaline Tamazeght Complex, High Atlas Mountains, Morocco: Mineral Chemistry and Petrological Constraints for Derivation from a Compositionally Heterogeneous Mantle Source. Journal of Petrology 49, 1097–1131.

Marks, M.A.W., Rudnick, R.L., Ludwig, T., Marschall, H. Zack, T., Halama, R., McDonough, W.F., Rost, D., Wenzel, T., Vicenzi, E.P., Savov, I.P., Altherr, R. & Markl, G. (2008): Sodic pyroxene and sodic amphibole as potential reference materials for in-situ Li isotope analyses by SIMS. Geost. Geoanal. Res 32, 295–310.

Marks, M.A.W., Rudnick, R.L., McCammon, C., Vennemann, T. & Markl, G. (2007): Arrested kinetic Li isotopic fractionation at the margin of the Ilímaussaq complex, South Greenland: evidence for open-system processes during final cooling of peralkaline igneous rocks. Chem. Geol. 246, 207–230.

Schmitt, A.K., Marks, M.A.W., Nesbor, H.D. & Markl, G. (2007): The onset and origin of differentiated Rhine Graben volcanism based on U-Pb ages and oxygen isotopic composition of zircon. Europ. J. Mineral. 19, 849–858.

Krumrei, T.V., Villa, I.M., Marks, M.A.W. & Markl, G. (2007): Response to the comment by A.K. Baski on „A ⁴⁰Ar/³⁹Ar and U/Pb isotopic study of the Ilímaussaq complex, South Greenland: implications for the ⁴⁰K decay constant and for the duration of magmatic activity in a peralkaline complex“. Chemical Geology 244, 347–349.

Müller-Lorch D., Marks M.A.W. & Markl G. (2007): Na and K distribution in agpaitic pegmatites. Lithos 95, 315–330.

Krumrei, T.V., Villa, I.M., Marks, M. & Markl, G. (2006): A 40Ar/39Ar and U/Pb isotopic study of the Ilímaussaq complex, South Greenland: Implications for the 40K decay constant and for the duration of magmatic activity in a peralkaline complex. Chem. Geol. 227, 258–273.

Mann, U., Marks, M. & Markl, G. (2006): Unusual mineral compositions in highly oxidized peralkaline igneous rocks: The Katzenbuckel volcano, Southwest Germany. Lithos 91, 262–285.

Schönenberger, J., Marks, M., Wagner, T. & Markl, G. (2006): Fluid-rock interaction in autoliths of agpaitic nepheline syenites in the Illimaussaq intrusion, South Greenland. Lithos 91, 331–351.

Halama, R., Marks, M., Brügmann, G., Siebel, W., Wenzel, T. & Markl, G. (2004): Crustal contamination of mafic magmas: Evidence from a petrological, geochemical and Sr-Nd-Os-O isotopic study of the Proterozoic Isortoq dike swarm, South Greenland. Lithos 74, 199–232.

Marks, M., Halama, R., Wenzel, T. & Markl, G. (2004): Trace element variations in clinopyroxene and amphibole from alkaline to peralkaline syenites and granites: Implications for mineral-melt trace-element partitioning. Chemical Geology 211, 185–215.

Marks, M., Vennemann, T., Siebel, W. & Markl, G. (2004): Nd-, O-, and H-isotopic evidence for complex, closed-system evolution of the peralkaline Ilímaussaq Intrusion, South Greenland. Geochim. Cosmochim. Acta 68, 3379–3395.

Marks, M. & Markl, G. (2003): Ilímaussaq "en miniature": closed-system fractionation in an agpaitic dike rock from the Gardar Province, South Greenland. Mineral. Mag. 67, 893-919.

Marks, M., Vennemann, T., Siebel, W. & Markl, G. (2003): Quantification of magmatic and hydrothermal processes in a peralkaline syenite-alkali granite complex based on textures, phase equilibria, and stable and radiogenic isotopes. Journal of Petrology 44, 1247–1280.

Marks, M. & Markl, G. (2001): Fractionation and Assimilation Processes in the alkaline augite syenite unit of the Ilímaussaq Intrusion, South Greenland, as deduced from phase equilibria. Journal of Petrology 42, 1947–1969.

Markl, G., Marks, M. & Wirth, R. (2001): The influence of T, aSiO2, and fO2 on exsolution textures in Fe-Mg olivine: An example from augite syenites of the Ilímaussaq Intrusion, South Greenland. Amer. Mineral. 86, 36–46.

Markl, G., Marks, M., Schwinn, G. & Sommer, H. (2001): Phase equilibrium constraints on intensive crystallization parameters of the Ilímaussaq intrusion, South Greenland. Journal of Petrology 42, 2231–2258.