The post-collisional Cihai iron skarn deposit,eastern Tianshan,Xinjiang, China |
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| Institution: | 1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;2. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;1. CONICET, Universidad Nacional de La Plata, Instituto de Recursos Minerales (INREMI), Calle 64 y 120, B1900FWA, La Plata, Argentina;2. CIC-BA, Universidad Nacional de La Plata, Instituto de Recursos Minerales (INREMI), Calle 64 y 120, B1900FWA, La Plata, Argentina;1. Development Research Centre, China Geological Survey, Beijing 100037, PR China;2. School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, PR China;1. Universidade Federal de Minas Gerais, CPMTC-Instituto de Geociências, Av. Presidente Antônio Carlos, 6627, Pampulha, Belo Horizonte – MG, Brazil;2. Aurizona Mineração: Avenida dos Holandeses, Ponta do Farol, São Luís – MA, Brazil;3. Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/SETEM, R.Prof. Mario Wernek s/n Campus da Pampulha, Belo Horizonte, MG - Brasil;4. The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;1. School of the Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. MLR Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;3. Centre for Exploration Targeting, University of Western Australia, 35 Stirling Highway, Crawley, WA 6008, Australia;4. Technology and International Cooperation Department, Ministry of Land and Resources, Beijing 100812, China;5. CNNC Beijing Research Institute of Uranium Geology, Beijing 100029, China;1. Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Ak. Koptyga, 3, 630090 Novosibirsk, Russia;2. Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Kryukovskiy tupic, 4, 111020 Moscow, Russia;3. Prospector Ltd, Vostochnaya Str., 56 (818), 620075 Ekaterinburg, Russia |
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| Abstract: | The Cihai iron skarn deposit is located in the southern part of the eastern Tianshan, Xinjiang, northwestern China. The major iron orebodies are banded and nearly parallel to each other. The iron ores are hosted in an early diabase dike and in skarn. Post-ore diabase dikes cut the iron ores and their hosting diabase. Hydrothermal activity can be divided into four stages based on geological and petrographic observations: initial K–Na alteration (stage I), skarn-minor magnetite event (II), retrograde skarn-magnetite main ore event (III), and quartz–calcite–sulfide veining (IV). Zircon U–Pb dating yields ages of 286.5 ± 1.8 Ma for early diabase and 275.8 ± 2.2 Ma for post-ore diabase dikes. Amphibole separated from massive magnetite ore gives a 40Ar–39Ar plateau age of 281.9 ± 2.2 Ma and is the time of ore formation. Formation of the Cihai iron deposit is closely related to post-collisional magmatism and associated Cu–Ni–Au polymetallic mineralization in the eastern Tianshan. |
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