Neoproterozoic subduction-accretionary tectonics of the South Qinling Belt, China
作者： Yunpeng Dong , Shengsi Sun , Zhao Yang , Xiaoming Liu , Feifei Zhang
DOI: 10.1016/J.PRECAMRES.2017.02.015
关键词: Geology 、 Diorite 、 Supercontinent 、 Subduction 、 Island arc 、 Gabbro 、 Earth science 、 Geochemistry 、 Rodinia 、 Basalt 、 Geochronology
摘要: Abstract The Neoproterozoic magmatism in the South Qinling Belt and northern margin of China Block is important key to understanding tectonic evolutionary history Block, reconstruct tectonics supercontinent Rodinia. Xiaomoling magmatic complex consists mainly basalts Mogouxia area, gabbros diorites Chishuigou, Lengshuigou Qianyouhe areas. are characterized by depletion LREEs LILEs, non- differentiation HFSEs, suggesting their deviation from a slightly depleted MORB mantle source. Taken together with geochemical geological data, basalt area interpreted have derived subduction-related back-arc basin setting. both Chishuigou sections display clear LREE, Th, LILEs enrichment, Nb, Ta Ti, highly which similar that typical Island Arc Basalts. areas strong LREE Ta, P enrichment flat distribution pattern HFSEs primitive mantle-normalized trace element pattern. According geochemistry, different localities were mostly likely formed an island-arc zircons concentrated gabbro diorite yield LA-ICPMS U-Pb ages 753 ± 4 Ma 843 ± 5 Ma, respectively, representing formation ages. Integrated all available geological, geochronological we propose represents northernmost accretionary belt north while Hannan-Huangling intrusions mark southernmost belt. Therefore, most southern wide subduction times. Our new geochronology previously published reliable estimate long-lived during ca. 850–700 Ma at present Block.
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