Constraining the role of the Qinling orogen in the assembly and break-up of Rodinia: Tectonic implications for Neoproterozoic granite occurrences

被引:145
作者
Chen, Zhihong
Lu, Songnian
Li, Huaikun
Li, Huimin
Xiang, Zhenqun
Zhou, Hongying
Song, Biao
机构
[1] Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China
[2] Chinese Acad Geol Sci, Beijing 100037, Peoples R China
基金
中国国家自然科学基金;
关键词
U-Pb geochronology; zircon; Neoproterozoic; Qinling orogen; geochemistry; Rodinia;
D O I
10.1016/j.jseaes.2005.03.011
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
New SHRIMP and ID-TIMS dating results in this study reveal that the widespread Early-Neoproterozoic granites in the Qinling orogen were emplaced mainly between similar to 960 and similar to 900 Ma. Major elements, mineral compositions, and trace elements data also indicate that all these Early-Neoproterozoic granites are characterized by the features of crust-derived and typical continent-continent syn-collisional granites. This imply that continent-continent collisional event could have occurred in the Qinling orogen during the period of similar to 960 to similar to 900 Ma, which was closely related to the formation of Rodinia. Thus, our study argues that the final assembly of Rodina occurred at similar to 900 Ma. On the other hand, K-feldspar granite (DQ05) (A-type granite) and granodiorite (DQ07) from the study area are dated at 711 +/- 11 and 717 +/- 10 Ma, respectively, and are considered to have generated in an extensional setting. This extensional tectonic regime originated from similar to 810 Ma when large scale continental bimodal volcanic rocks were formed in South Qinling and lasted at least until the time of similar to 710 Ma, which is consistent with the break-up of Rodinia. This study also suggests that the North China Craton did not collide and join together with the South China Craton in the Neoproterozoic, and both of them were probably far away from each other. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:99 / 115
页数:17
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