Anna Grosche

Dr. Anna Grosche (geb. Schaarschmidt)
Research assistant

Lehrstuhl für Endogene Geodynamik
Schloßgarten 5
91054 Erlangen

+49 9131 85-26071

Research interests

My research focuses on the enrichment of metals in hydrothermal systems as well as on the composition and evolution of arc magmas. The geochemistry of minerals and rocks can be used to reveal the processes that lead to extensive magmatic activity associated with economically valuable mineral deposits along the convergent plate boundaries of the Earth.

During my PhD work, I investigated the formation of K-rich arc magmas and the effects of magmatic processes on the formation of corresponding porphyry and epithermal deposits in the shallow crust. In addition, I developed a new tectono-magmatic model for the Aegean subduction system that demonstrates the influence of variable subducted crustal material on the arc magma composition during the last 30 million years. Recently, I studied the formation of hydrothermal systems in the shallow crust using Pb-Zn-Ag-Au-Te-rich vein mineralizations on the Island of Milos in the South Aegean Volcanic Arc. In-situ trace element and isotopic analysis of ore minerals allows us to determine the sources of metals and volatiles, as well as the processes of metal enrichment, which is critical for the understanding of hydrothermal ore deposits worldwide.

Projects

In the current project Sources and enrichment processes of metal(loid)s in submarine back-arc hydrothermal systems: A combined Se and multiple S isotope approach (DFG IODP priority programme), we are studying the behavior of metals and metalloids during hydrothermal flow. In doing so, we use samples from black smoker chimneys and subseafloor stockwork zones of active back-arc vent systems in the Pacific Ocean that have a variable input of magmatic volatiles. We aim to determine the combined selenium and sulfur isotopic signature of submarine back-arc hydrothermal precipitates and their host lavas to gain new insights into the sources, fractionation, and precipitation of chalcophile elements in these systems.

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Publications

2024

Falkenberg J., Keith M., Haase K., Klemd R., Kutzschbach M., Grosche A., Scicchitano MR., Strauss H., Kim J.:
Pyrite trace element proxies for magmatic volatile influx in submarine subduction-related hydrothermal systems
In: Geochimica Et Cosmochimica Acta 373 (2024), p. 52-67
ISSN: 0016-7037
DOI: 10.1016/j.gca.2024.03.026
Grosche A., Keith M., Klemd R., Strauss H., Rosca C., König S.:
Temperature-controlled Se-S isotope fractionation during seawater mixing and sulfide precipitation in black smoker chimneys
In: Geochimica Et Cosmochimica Acta 372 (2024), p. 13-27
ISSN: 0016-7037
DOI: 10.1016/j.gca.2024.03.007

2023

Grosche A., Klemd R., Denkel K., Keith M., Haase K., Voudouris PC., Alfieris D., Wiedenbeck M.:
Sources, transport, and deposition of metal(loid)s recorded by sulfide and rock geochemistry: constraints from a vertical profile through the epithermal Profitis Ilias Au prospect, Milos Island, Greece
In: Mineralium Deposita (2023)
ISSN: 0026-4598
DOI: 10.1007/s00126-023-01170-2

2022

Glaser L., Grosche A., Voudouris PC., Haase K.:
The high-K calc-alkaline to shoshonitic volcanism of Limnos, Greece: implications for the geodynamic evolution of the northern Aegean
In: Contributions To Mineralogy and Petrology 177 (2022)
ISSN: 0010-7999
DOI: 10.1007/s00410-022-01940-7
Sotiriou P., Haase K., Schneider K., Grosche A., Nöbel K., Chivas AR.:
Growth of the upper crust in intra-oceanic island arcs by intrusion of basaltic magmas: the case of the Koloula Igneous Complex, Guadalcanal, Solomon Islands (SW Pacific)
In: Contributions To Mineralogy and Petrology 177 (2022), Article No.: 107
ISSN: 0010-7999
DOI: 10.1007/s00410-022-01972-z

2021

Schaarschmidt A., Haase K., Klemd R., Keith M., Voudouris PC., Alfieris D., Strauss H., Wiedenbeck M.:
Boiling effects on trace element and sulfur isotope compositions of sulfides in shallow-marine hydrothermal systems: Evidence from Milos Island, Greece
In: Chemical Geology 583 (2021), p. 120457
ISSN: 0009-2541
DOI: 10.1016/j.chemgeo.2021.120457
Schaarschmidt A., Haase K., Voudouris PC., Melfos V., Klemd R.:
Migration of Arc Magmatism Above Mantle Wedge Diapirs With Variable Sediment Contribution in the Aegean
In: Geochemistry Geophysics Geosystems 22 (2021), Article No.: e2020GC009565
ISSN: 1525-2027
DOI: 10.1029/2020GC009565
URL: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020GC009565
Schaarschmidt A., Klemd R., Regelous M., Voudouris PC., Melfos V., Haase K.:
The formation of shoshonitic magma and its relationship to porphyry-type mineralisation: the Maronia pluton in NE Greece
In: Lithos 380-381 (2021), Article No.: 105911
ISSN: 0024-4937
DOI: 10.1016/j.lithos.2020.105911
Voudouris P., Repstock A., Spry PG., Frenzel M., Mavrogonatos C., Keith M., Tarantola A., Melfos V., Tombros S., Zhai D., Cook NJ., Ciobanu CL., Schaarschmidt A., Rieck B., Kolitsch U., Falkenberg J.:
Physicochemical constraints on indium-, tin-, germanium-, gallium-, gold-, and tellurium-bearing mineralizations in the Pefka and St Philippos polymetallic vein- and breccia-type deposits, Greece
In: Ore Geology Reviews (2021), p. 104348
ISSN: 0169-1368
DOI: 10.1016/j.oregeorev.2021.104348

2020

Melfos V., Voudouris P., Melfou M., Sánchez MG., Papadopoulou L., Filippidis A., Spry PG., Schaarschmidt A., Klemd R., Haase K., Tarantola A., Mavrogonatos C.:
Mineralogical constraints on the potassic and sodic-calcic hydrothermal alteration and vein-type mineralization of the maronia porphyry cu-mo ± re ± au deposit in NE greece
In: Minerals 10 (2020), Article No.: 182
ISSN: 2075-163X
DOI: 10.3390/min10020182

2019

Voudouris P., Mavrogonatos C., Spry PG., Baker T., Melfos V., Klemd R., Haase K., Repstock A., Djiba A., Bismayer U., Tarantola A., Scheffer C., Moritz R., Kouzmanov K., Alfieris D., Papavassiliou K., Schaarschmidt A., Galanopoulos E., Galanos E., Kołodziejczyk J., Stergiou C., Melfou M.:
Porphyry and epithermal deposits in Greece: An overview, new discoveries, and mineralogical constraints on their genesis
In: Ore Geology Reviews 107 (2019), p. 654-691
ISSN: 0169-1368
DOI: 10.1016/j.oregeorev.2019.03.019
de Wall H., Schaarschmidt A., Kämmlein M., Gabriel G., Bestmann M., Scharfenberg L.:
Subsurface granites in the Franconian Basin as the source of enhanced geothermal gradients: a key study from gravity and thermal modeling of the Bayreuth Granite
In: International Journal of Earth Sciences (2019)
ISSN: 1437-3254
DOI: 10.1007/s00531-019-01740-8

2018

Eberts A., Schaarschmidt A., Bauer W., Stollhofen H., de Wall H.:
Morphotectonic analysis of basement and cover units in eastern Bavaria, SE Germany - insights into the deeper crustal architecture?
GeoBonn 2018 (University of Bonn, Bonn, 2. September 2018 - 6. September 2018)
Schaarschmidt A., Haase K., de Wall H., Bestmann M., Krumm S., Regelous M.:
Upper crustal fluids in a large fault system: microstructural, trace element and oxygen isotope study on multi-phase vein quartz at the Bavarian Pfahl, SE Germany
In: International Journal of Earth Sciences (2018)
ISSN: 1437-3254
DOI: 10.1007/s00531-018-1666-y
URL: https://link.springer.com/article/10.1007/s00531-018-1666-y

2015

Schaarschmidt A., Saßenscheidt M., Scharfenberg L., de Wall H., Gabriel G.:
Gesteinsmagnetische Untersuchungen an Doggersandsteinen (Süddeutschland, Fränkische Alb)
In: Geologische Blätter für Nordost-Bayern und angrenzende Gebiete 65 (2015), p. 199-220
ISSN: 0016-7797

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