中文摘要：

标明日期的锆石虾 U-Pb 在 Dabie orogen 和它的原岩(忍受石榴石的 epldote-mica-quartzschist ) 的 Beihuaiyang 地区在 Wangmuguan 为橄榄石斑粝岩被执行。结果证明斑粝岩在 635 +- 被使结晶 5 妈，在 lateNeoproterozoic 而非在晚古生代当以前建议了；它在 464 +-7 妈，形成的原岩比围住的斑粝岩年轻。为斑粝岩的 U-Pb 年龄在对为凝灰岩的年龄的好同意内部有从在基本的塘群在华南块的北边缘在湖北省的 Suizhou toZaoyang 的区域上在大规模上散布了的华南 Blockand late-Neoproterozoic 的 Doushantuo 形成的沉积的成层的。这建议 alarge 规模 magmatic 活动在华南块发生在迟了的 Neoproterozoic，以便在在 Beihuaiyang 地区的西方的片断的 Wangmuguan 的斑粝岩是与华南块的北边缘的大地构造的亲密关系。自从橄榄石，斑粝岩与在他们之间的构造接触发生在奥陶纪 protolith 的片岩以内但是在不同构造背景形成， late-Neoproterozoic 斑粝岩在华南块的三叠纪的 subduction 期间从华南块的前寒武纪的地下室被分开，这被结束，并且在在北方中国块的南部的边缘的变形岩石上的 tectonicallythrusted 。

英文摘要：

Zircon SHRIMP U-Pb dating was performed for olivine gabbro at Wangmuguan in the Beihuaiyang zone of the Dabie orogen and its country rock （garnet-bearing epidote-mica-quartz schist）. The results show that the gabbro was crystallized at 635±5 Ma, in the late Neoproterozoic rather than in the late Paleozoic as previously suggested; its country rocks formed at 464±7 Ma, younger than the enclosed gabbro. The U-Pb age for the gabbro is in good agreement with ages for tuff interbedded with sediments from the Doushantuo Formation in the South China Block and late-Neoproterozoic basic dyke swarms distributed on a large scale over areas of Suizhou to Zaoyang of Hubei Province in the northern margin of the South China Block. This suggests a large-scale magmatic activity occurred at the late Neoproterozoic in the South China Block, so that the gabbro at Wangmuguan in the western segment of the Beihuaiyang zone is geotectonic affinity to the northern margin of the South China Block. Since the olivine gabbro occurs within the schist of Ordovician protolith with tectonic contact between them but forming in different tectonic settings, it is concluded that the late-Neoproterozoic gabbro was detached from the Precambrian basement of the South China Block during the Triassic subduction of the South China Block, and tectonically thrusted over the metamorphosed rocks in the southern margin of the North China Block.