Distal Skarns as an Ore-Forming Environment: Insights on Metasomatic Processes from Growth Mechanisms, Mineral and Fluid Geochemistry in the Madan Pb-Zn(Ag-Cu) Deposits, Southern Bulgaria

Diplôme Thèse Distal Skarns as an Ore-Forming Environment: Insights on Metasomatic Processes from Growth Mechanisms, Mineral and Fluid Geochemistry in the Madan Pb-Zn(Ag-Cu) Deposits, Southern Bulgaria eng 2021-10-13 2022-02-11 author Hantsche Aaron Lee 0000-0001-5282-7630 861788 director Kouzmanov Kalin 0000-0002-7327-8949 529239 155 10.13097/archive-ouverte/unige:159673 urn:nbn:ch:unige-1596730 Sc. 5635 Distal skarns host lead and zinc deposits in the Madan ore field in southern Bulgaria. These Mn-rich, pyroxene skarns formed due to cyclic pulses of metasomatic fluid during the early Oligocene, prior to Pb-Zn mineralization. Skarn formation occurs through the dissolution of the host rock, where fluid processes are recorded in calcite at the skarn boundary layer. New techniques for geological mapping relate the skarn body distribution to pyroxene mineral geochemistry. Similarly, host-rock controls on skarn formation caused simultaneous formation of epidote skarns, which are spatially limited to near fluid conduits. The link between pyroxene and epidote skarns can be exploited through district-scale geochemical tracers within skarn minerals. Trace elements such as As, Zn, Mn, and Sb in the epidote mineral structure correspond directly to orebody grades in the district, providing a new tool for potential vectoring and evaluation of base metal districts. Geochemistry Skarn Geology Pyroxene Epidote Distal skarn Bulgaria Madan Fluid inclusions Dewey 550 29 Section des sciences de la Terre et de l'Environnement 15 false 692 Mineral Resources and Geofluids f93a6d9b-b1ca-46aa-9010-380158e193f1 Thesis Public Thesis Stich_Final Publication_0303.pdf 116376941 application/pdf Restricted 2023-03-31 d52d3b6eedc470f923573e6fb0a07b56ea120c91cf79a8fbec952d6136b91cf3 openAccess Faculté des sciences / Section des sciences de la Terre et de l'Environnement

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Distal Skarns as an Ore-Forming Environment: Insights on Metasomatic Processes from Growth Mechanisms, Mineral and Fluid Geochemistry in the Madan Pb-Zn(Ag-Cu) Deposits, Southern Bulgaria				2022	861	509

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Hantsche, Aaron Lee

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