| Tectonic setting of the Helong Block: Implications for the northern boundary of the eastern North China Craton |
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| 作者姓名： | ZHANG Yanbin WU Fuyuan ZHAI Mingguo & LU Xiaoping . Institute of Geology and Geophysics Chinese Academy of Sciences P.O. Box Beijing China . Regional Geological and Mineral Resources Survey of Jilin Province Changchun China |
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| 作者单位： | ZHANG Yanbin1，WU Fuyuan1，ZHAI Mingguo1 & LU Xiaoping1，2 1. Institute of Geology and Geophysics，Chinese Academy of Sciences，P.O. Box 9825，Beijing 100029，China; 2. Regional Geological and Mineral Resources Survey of Jilin Province，Changchun 130062，China |
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| 基金项目： | 国家自然科学基金，China Geological survey |
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| 摘 要： | The Helong block, located in southeastern Jilin Province, was thought to be an Archean geological unit in the most northeast part of the North China Craton (NCC)1,2]. Previous geological survey sug-gested that this block is mainly composed of two parts: Jinchengdong Archean metamorphic supracrustal rocks intruded by Archean TTG complex3―5], and the Bailiping granite6,7] distributed in the Shiliping-Bai- liping-Guangping area. Both of them were thought as the Jinchengdong (or Helong…
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Tectonic setting of the Helong Block: Implications for the northern boundary of the eastern North China Craton |
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| ZHANG Yanbin,WU Fuyuan,ZHAI Mingguo & LU Xiaoping, . Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O. Box ,Beijing ,China, . Regional Geological and Mineral Resources Survey of Jilin Province,Changchun ,China.Tectonic setting of the Helong Block: Implications for the northern boundary of the eastern North China Craton[J].Science in China(Earth Sciences),2005,48(10). |
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| Authors: | ZHANG Yanbin WU Fuyuan ZHAI Mingguo LU Xiaoping |
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| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;Regional Geological and Mineral Resources Survey of Jilin Province, Changchun 130062, China |
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| Abstract: | LA-ICP-MS zircon U-Pb dating indicates that the Bailiping granitic pluton was emplaced during Late Paleozoic to Early Cretaceous (285―116 Ma) by four distinct magmatic episodes, arguing against the previous thought that the Bailiping granites were emplaced during Archean, Proterozoic or Early Paleozoic. It is suggested that the so-called Archean Jinchengdong granite-greenstone belt, mainly composed of Bailiping granites, should be broken down. Sr-Nd isotopic compositions of the Bailiping granites are similar to those of the Phanerozoic granites in the Xing'an-Mongolian orogenic belt, suggesting that their parental magmas were mainly derived from a juvenile crust with some contamination of ancient crustal materials during magma rising and/or emplacement. Therefore, the basement of the Helong Block is similar to that in the northern Xing'an-Mongolian Orogenic Belt, but different from that of the North China Craton. It is proposed that the Archean Jinchengdong complex in this area is probably an exotic slice from the North China Craton, which indicates that the Fu'erhe-Gudonghe Fault, located in northern part of the Helong area, is not the boundary between the North China Craton and the Xing'an-Mongolian Orogenic Belt. The possible boundary should be located further southward more than 50 km and near the Baitoushan volcano. |
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| Keywords: | LA-ICPMS ziron U-Pb dating Bailiping complex Helong Block North China Craton Sr-Nd isotope |
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