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《Earth Science》 2017-12
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Chronology and Tectonic Implications of Neoproterozoic Volcanics from Chiniot Deposit,Pakistan

Xu Jiannan;Ma Changqian;Yin Shuo;Wang Lianxun;Dun Xinhai;State Key Laboratory of Geological Processes and Mineral Resources,Faculty of Earth Sciences,China University of Geosciences;Wuhan Surveying-Geotechnical Research Institute Co.Ltd.Of MCC;  
This is a hotpoint that the study the breakup of Rodinia supercontinent and the formation of Chiniot iron oxide-apatite deposit,we report zircon U-Pb ages,Hf isotopic composition and REE contents of andesite.All the zircons are magmatic origin with the similar REE patterns which are enriched in HREE with a positive Ce anomaly and a negative Eu anomaly.The zircon U-Pb isotopic analyses yields 206 Pb/238 U ages of 947.8±4.0 Ma and 883.0±5.1 Ma,which can be interpreted as the crystallization ages of two stages of andesites.Besides,the inherited zircons with U-Pb age of 1 523.0±66 Ma may indicate a Mesoproterozoic basement.The igneous zircons have highly variableεHf(t)values ranging from-4.67 to+13.10,indicating that the andesites were derived from partial melting of a mixed mantle sourse.The geochemical and isotopic variation suggest that mantle-derived basic magmas have went through some degree of crustal commination during migration through Mesoproterozoic granitoids.The formation of the andesites were induced by a series of tectono-thermal events,associated with extensional rift and mantle plume during Rodinia supercontinent.There are many similarities between Chiniotiron deposit and Khetri Copper Belt in geological setting of ore-forming processes,indicating that the metallogenetic potentiality of giant IOCG is very well.The northwest of Indian craton may have connection with North China-Congo-S2 o Francisco craton between 960 Ma and 880 Ma.
【Fund】: 国家自然科学基金项目(No.41272079);; “中巴经济走廊”成矿背景综合研究引智计划(No.T2017005)
【CateGory Index】: P588.14
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