Zircon U-Pb ages for Wulian granites in northwest Sulu and their tectonic implications
Zircon U-Pb ages for Wulian granites in northwest Sulu and their tectonic implications
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DOI：
10.1007/bf03183234
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发表时间：
2003-02
影响因子：
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通讯作者：
Jian‐Bo Zhou;Yong‐Fei Zheng;Y. Wu
中科院分区：
文献类型：
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作者：
Jian‐Bo Zhou;Yong‐Fei Zheng;Y. Wu
产于苏鲁造山带西北部的五莲杂岩由绿片岩相的变质火成岩和变质沉积岩组成。其中3个花岗岩侵入体的锆石U-Pb年龄分别为(672±4)Ma、(742±9)Ma和(747±14)Ma。这些年龄表明，这些花岗岩是扬子板块北缘的新元古代侵入岩，与大别造山带东段北淮阳带东段陆镇关的岩浆杂岩相对应。它们是三叠纪俯冲过程中从扬子板块上刮下来的构造岩片，属于扬子板块俯冲的增生楔体的一部分。五莲地区大量新元古代岩浆岩的发现表明，北中国板块与扬子板块的缝合位置在五莲杂岩以北。
The Wulian complex occurring in the north-western part of the Sulu orogen consists of metaigneous and metasedimentary rocks at greenschist-facies. Zircon U-Pb dating for three granite intrusions within it yields concordant ages of (672±4), (742±9) and (747±14) Ma, respectively. These ages indicate that the granites are the Neoproterozoic intrusions in the northern margin of the Yangtze plate, and correspond to the magmatic complex at Luzhenguan in the eastern part of the Beihuaiyang belt in the Dabie orogen. They were tectonic slices scraped off from the Yangtze plate during Triassic subduction and thus belong to a part of the accretionary wedge of the Yangtze plate subduction. The discovery of extensive Neoproterozoic magmatic rocks in the Wulian area suggests that the suture location between the North China and the Yangtze plates lies north of the Wulian complex.