Anna Grosche › Geozentrum Nordbayern EN

Anna Grosche (geb. Schaarschmidt)
PhD Student

Lehrstuhl für Endogene Geodynamik
Schloßgarten 5
91054 Erlangen

+49 9131 85-26071

Evolution of shoshonitic and calc-alkaline arc magmatism and related processes of metal enrichment in the Aegean

The Aegean hosts a range of magmatic-hydrothermal ore deposits of Cenozoic age, many of which are related to arc magmas of the Hellenic subduction zone. My work is focused on key locations like the Maronia-Kassiteres area in NE-Greece and Milos Island, that show successions of calc-alkaline to shoshonitic magmas that host porphyry-epithermal-style mineralization. We study the magma sources, the magma evolution, and the magma emplacement, as well as the physico-chemical conditions and processes that control the metal enrichment and precipitation in the shallow crust. We also investigate the migration of the Aegean subduction and the influence of sediment subduction during the past 30 million years. Thereby, we use whole-rock trace element and Sr-Nd-Pb isotope analysis and mineral chemistry to reveal the evolution arc magmas. In-situ trace element and isotope analysis of ore minerals allows us to define the sources of metals and volatiles, as well as the processes of metal enrichment, which is crucial for the understanding of hydrothermal ore deposits worldwide.

Deutsche Version ->

Publications

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

≤