Cenozoic magmatism in Kalimantan and its related geodynamic evolution |
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| Institution: | 1. Graduate School of International Resource Sciences, Akita University, Japan;2. Unconventional Geo-resources Research Group, Faculty of Engineering, Universitas Gadjah Mada, Indonesia;3. Research Center for Geological Resources, The National Research and Innovation Agency (BRIN), Indonesia;4. Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Indonesia;1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Department of Earth Science, University of Ghana, P. O. Box LG 58, Legon-Accra, Ghana;1. SE Asia Research Group, Department of Earth Sciences, Royal Holloway University of London, Egham TW20 0EX, UK;2. Department of Earth Sciences, University College London, London WC1H 0BT, UK;3. Department of Earth Sciences, Royal Holloway University of London, Egham TW20 0EX, UK |
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| Abstract: | The NE–SW Tertiary magmatic belt of central Kalimantan is related to two separate periods of subduction; during the Eocene–Oligocene and Late Oligocene–Miocene. The younger magmatic belt is superimposed upon the earlier belt. This magmatic belt is characterized chiefly by Late Oligocene–Miocene volcanic products, among which limited exposures of the Eocene volcanics have also been mapped by previous investigators. This calc-alkaline magmatic belt has become known as the ‘gold belt’ of Central West Kalimantan on account of a number of discoveries of Neogene epithermal gold mineralization. This mineralization is found in central to proximal volcanic settings and occurred at relatively shallow depths. The earliest known subduction-related magmatism took place in the Eocene–Early Oligocene with the emplacement of calc-alkaline silicic pyroclastics, followed by a period of continental collision. Subsequent subduction-related magmatism continued from Late Oligocene–Pleistocene, during which time the magma evolved from calc-alkaline to potassic calc-alkaline. Plio-Pleistocene magmatism resulted in the formation of basalt flows. The present available K–Ar ages of the Cenozoic volcanics range from 51 to 1 Ma. |
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