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Tectonic setting of the Helong Block:Implications for the northern boundary of the eastern North china Craton

Science china Earth sciences 2005年第10期48卷 1599-1612页

作者： zhang yanbin1, wu fuyuan1,{2.,2.1. institute of geology and geophysics, Chinese academy of sciences, p.o. box 982., beijing 10002., china 2. Regional Geological and Mineral Resources Survey of Jilin p.o.ince, Changchun 130062. china institute of geology and {2. Chinese academy of sciences beijing china Regional Geological and Mineral Resources Survey of Jilin p.o.ince Changchun china

LA-ICp-MS zircon U-pb dating indicates that the Bailiping granitic pluton was em-placed during Late paleozoic to Early Cretaceous (2.5―116 Ma) by four distinct magmatic epi-sodes, arguing against the previous thought that the Bailiping granites were emplaced during Archean, p.o.erozoic or Early paleozoic. It is suggested that the so-called Archean Jincheng-dong 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{2. Craton. It is p.o.osed that the Archean Jinchengdong complex in this area is p.o.ably an exotic slice from the North{2. Craton, which indicates that the Fu’erhe-Gudonghe Fault, located in northern part of the Helong area, is not the boundary between the North{2. 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.

关键词： LA-ICpMS ziron U-pb dating, Bailiping complex, Helong Block, North china Craton, Sr-Nd isotope.

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