SHRIMP zircon U–Pb geochronological and whole-rock geochemical evidence for an early Neoproterozoic Sibaoan magmatic arc along the southeastern margin of the Yangtze Block
SHRIMP zircon U–Pb geochronological and whole-rock geochemical evidence for an early Neoproterozoic Sibaoan magmatic arc along the southeastern margin of the Yangtze Block
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扬子地块东南缘早新元古代四宝安岩浆弧的SHRIMP锆石U-Pb年代学和全岩地球化学证据
DOI：
10.1016/j.gr.2006.09.001
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发表时间：
2007-08
影响因子：
6.1
通讯作者：
中科院分区：
文献类型：
--
作者：
华南陆块是在元古宙四堡期造山作用中由扬子陆块和华夏陆块拼合而成的，这一观点已被普遍接受，但四堡期造山作用的时间和运动学尚未得到很好的限定。本文报道了扬子地块东南缘浙江东北部陶洪和西丘英云闪长岩-花岗闪长岩群的SHRIMP锆石U-Pb年代学和地球化学资料。这些岩石的年龄分别为913±15 Ma和905±14 Ma，是形成于活动大陆边缘的典型富角闪钙碱性花岗岩类。结合前人报道的赣东北4.0Ga蛇绿岩和4.97Ga埃达克质岩石的同位素年龄，认为四堡东段的造山作用时间在4.0 ~ 4.9Ga之间。华南四堡造山带与印度东高止山脉带、东南极Rayner省等新元古代早期造山带（1.0- 0.9Ga）基本同期，表明Rodinia造山带的最终组装是在1.09Ga之前完成的。
It has been generally accepted that the South China Block was formed through amalgamation of the Yangtze and Cathaysia Blocks during the Proterozoic Sibaoan orogenesis, but the timing and kinematics of the Sibao orogeny are still not well constrained. We report here SHRIMP U–Pb zircon geochronological and geochemical data for the Taohong and Xiqiu tonalite–granodiorite stocks from northeastern Zhejiang, southeastern margin of the Yangtze Block. Our data demonstrate that these rocks, dated at 913±15 Ma and 905±14 Ma, are typical amphibole-rich calc-alkaline granitoids formed in an active continental margin. Combined with previously reported isotopic dates for the ∼1.0 Ga ophiolites and ∼0.97 Ga adakitic rocks from northeastern Jiangxi, the timing of the Sibao orogenesis is thus believed to be between ∼1.0 and ∼0.9 Ga in its eastern segment. It is noted that the Sibao orogeny in South China is in general contemporaneous with some other early Neoproterozoic (1.0–0.9 Ga) orogenic belts such as the Eastern Ghats Belt of India and the Rayner Province in East Antarctica, indicating that the assembly of Rodinia was not finally completed until ∼0.9 Ga.
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影响因子：
3.8
作者：
Xian‐Hua Li;Zheng‐Xiang Li;W. Ge;Hanwen Zhou;Wu-Xian Li;Y. Liu;M. Wingate
通讯作者：
Xian‐Hua Li;Zheng‐Xiang Li;W. Ge;Hanwen Zhou;Wu-Xian Li;Y. Liu;M. Wingate
影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
影响因子：
5.8
作者：
R. Larson
通讯作者：
R. Larson
影响因子：
3.8
作者：
Wenjie Li
通讯作者：
Wenjie Li
影响因子：
3.5
作者：
B. Singer;J. D. Myers;C. Frost
通讯作者：
B. Singer;J. D. Myers;C. Frost