| Age of Yingfeng rapakivi granite pluton on the north flank of Qaidam and its geological significance |
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| 作者单位： | XIAO Qinghui1，2，LU Xinxiang1，3，WANG Fei4，SUN Yangui5，WEI Xiangdong3 & XING Zuoyun6 1. Division of Granite Geology，China Geological Survey，Yichang 443003，China; 2. Information Center of Ministry of Land and Resources，Beijing 100812，China; 3. Geological Survey of Henan Province and Institute of Geological Research of Henan Province，Zhengzhou 450053，China; 4. Geological Institute，China Seismological Bureau，Beijing 100029，China; 5. Geological Survey Institute of Qinghai Province，Xining 810032，China; 6. China University of Geosciences，Wuhan 430074，China |
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| 摘 要： | Rapakivi granite is a very rare and special type of rocks in the crust. Nearly all the typical Proterozoic rapakivi occurred in stable craton, and was regarded as representing special anorogenic settings and rifting events of the supercontinents. Therefore, rapakivi has constantly been attracting the attention of researchers from various countries15]. For example, the Protero- zoic rapakivi granites occurring in Miyun, Beijing, has been studied in detail by the researchers both at home and …
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Age of Yingfeng rapakivi granite pluton on the north flank of Qaidam and its geological significance |
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| Authors: | XIAO Qinghui LU Xinxiang WANG Fei SUN Yangui Wei Xiangdong XlNG Zuoyun |
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| Abstract: | The Yingfeng rapakivi granite on the north flank of Qaidam is a newly discovered Proterozoic rapakivi pluton in China, which was found after the discovery of Shachang rapakivi in Miyun County, Beijing and Kuandian rapakivi in Jilin Province. Yingfeng rapakivi pluton is exposed on the north side of the suture belt between Qinling-Kunlun orogenic belt and North China plate. U-Pb zircon isotopic dating and Ar-Ar isotopic dating of both hornblende and K-feldspar from the Yingfeng rapakivi granite have been conducted. The results show that the age of (1776±33)Ma at the upper intercept in Concorde diagram represents the age of formation of the pluton,whereas the age of (526 ± 281) Ma at the lower intercept and Ar-Ar mineral dating of hornblende and K-feldspar correspond to the age of a later event affecting the pluton, suggesting that Yingfeng pluton has ever been affected by strong regional Caledonian-Hercynian tectonic movement after its formation. The discovery of middle Proterozoic Yingfeng rapakivi granite provides a petrologic evidence for the timing of cratonization of both the continental crust basement in western China and the basement of the North China plate and for a rifting event taking place in the mid-Proterozoic, suggesting that an amalgamation of ancient China continents had ever happened during the "L(u) liang Movement" between the early Proterozoic and the mid-Proterozoic. |
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| Keywords: | rapakivi U-Pb dating Ar-Ar dating Kunlun-Qinling orogenic belt |
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