Fluid evolution in the Pote Shear Zone Harare-Shamva-Bindura greenstone belt (northeast Zimbabwe) |
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| Institution: | 1. Department of Geography & Environmental Science, University of Zimbabwe, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe;2. Institute for Water Studies, Dept of Earth Sciences, University of the Western Cape, Private Bag X17, Bellville, 7535, South Africa;3. Department of Physics, University of Zimbabwe, P.O. Box MP 167, Mount Pleasant, Harare, Zimbabwe;1. CPRM – Serviço Geológico do Brasil – SUREG-PA, Brazil;2. USP – Universidade de São Paulo, Brazil;3. UFRGS – Universidade Federal do Rio Grande do Sul, Brazil;1. Orebusters Pty Ltd, Gwelup 6018, Western Australia, Australia;2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;3. Centre for Tectonics Resources and Exploration, Dept. of Earth Sciences, University of Adelaide, SA 5005, Australia;4. Division of Interdisciplinary Science, Faculty of Science, Kochi University, Kochi 780-8520, Japan;1. Communicable Disease Research Laboratory, St. Joseph’s College, Irinjalakuda, India;2. Department of Zoology, Christ College, Irinjalakuda, University of Calicut, India;3. Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum, 695 019, India;4. School of Civil and Environmental Engineering, Yonsei University, Seoul, South Korea;5. Center for Innovation and Translational Research, CSIR- Indian Institute of Toxicology Research, Lucknow, 226 001, India;6. Frontier Research Lab, Yonsei University, Seoul, South Korea |
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| Abstract: | A fluid inclusion study was completed on syn-deformational quartz veins of the Pote River Shear Zone, which is situated on the border between the Harare-Bindura greenstone belt and the granitoids of the Chinamora Batholith. The fluid inclusions were studied by means of microthermometry and Laser-Raman microspectrometry. The fluid inclusions consist of three major compositional types: (1) H2OCO2±N2±halite inclusions in clusters and trails; (2) H2OCO2 inclusions (H2O = 30–60 vol. %) in trails; and (3) H2O-halite inclusions in trails. These fluid generations are explained by trapping at different P-T conditions of two different fluids: a high salinity aqueous fluid and a low salinity H2OCO2 fluid with XH2O around 0.8. High salinity aqueous fluid inclusions are characteristic for the granite-greenstone contact and are absent within the Harare-Shamva-Bindura greenstone belt. The high salinity aqueous fluid has, therefore, been interpreted as magmatic in origin. The low salinity H2OCO2 fluid is most likely metamorphic in origin. |
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