The Dorn gold deposit in northern Victoria Land,Antarctica: Structure,hydrothermal alteration,and implications for the Gondwana Pacific margin |
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| Authors: | Laura Crispini Laura Federico Giovanni Capponi Franco Talarico |
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| Institution: | 1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;3. Geology Department, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada;4. Institution of Earth Science, Chinese Academy of Sciences, Beijing 100029, China;5. School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China;6. Department of Earth Science, University of Adelaide, Adelaide, SA 5005, Australia;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;3. College of Resources, Shijiazhuang University of Economics, Shijiazhuang 050031, China;4. Center for Isotope Geochemistry, University of California, Berkeley, CA 94720, USA;5. Department of Earth and Space Sciences, University of California, Los Angeles, CA 90024, USA;6. State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;7. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an 710069, China |
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| Abstract: | The Dorn gold deposit in northern Victoria Land, Antarctica is a fault related gold-only deposit and it represents the first described occurrence of gold mineralization in Paleozoic terranes of the Antarctic continent. The deposit is hosted in lower greenschist facies Middle Cambrian metavolcanic and metasedimentary rocks of the Bowers terrane. Gold-bearing veins are located in a brittle–ductile reverse high-strain zone, which was produced by transpressional deformation that overprints the structures of the Cambrian–Ordovician Ross Orogeny. The vein system is surrounded by a hydrothermal alteration zone that is as much as 300-m-wide, where the host rocks are partially to completely transformed into Fe–Mg carbonate-rich rocks with different degrees of replacement of the original mineralogy and texture.The type of host rock, the temperature estimates for mineralization from 290–320 °C, the quartz dominant vein system with sulfides and Fe-rich carbonates, and the controlling structures linked to a convergent margin tectonic setting together suggest that this mineralized vein system can be classified as an orogenic gold deposit. Close analogies are found with deposits of the Stawell zone in western Victoria, which is consistent with the correlation between units and hydrothermal events in northern Victoria Land and southeastern Australia. |
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