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Zircon U-Pb ages for Wulian granites in northwest Sulu and their tectonic implications

机译：苏鲁西北五莲花岗岩的锆石U-Pb年龄及其构造意义

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摘要

The Wulian complex occurring in the northwestern 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 Neopro-terozoic intrusions in the northern margin of the Yangtze plate, and correspond to the magmatic complex at Luzhen-guan 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.
机译：发生在苏鲁造山带西北部的五连复合体，由绿片岩相中的亚火成岩和沉积沉积岩组成。锆石U-Pb在其中三个花岗岩侵入岩中的年龄分别为（672±4），（742±9）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，与大别造山带北淮阳带东部陆镇关的岩浆复合体相对应。它们是三叠纪俯冲过程中从扬子板块刮下的构造切片，属于扬子板块俯冲带增生楔的一部分。在五莲地区发现了广泛的新元古代岩浆岩，这表明华北与扬子板块之间的缝合位置位于五莲综合体的北部。

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