南海北缘琼南缝合带的锆石U-Pb年龄制约

发布时间：2018-04-11 08:17

本文选题：琼南缝合带 + 琼南海盆　；参考：《海洋地质与第四纪地质》2016年04期

【摘要】：为了获得南海北缘琼南缝合带南北两侧地块的碰撞时间,对九所陵水东段采集的中高级变质石榴石石英片岩和花岗质片麻岩进行了LA-ICP-MS锆石U-Pb定年。实验结果发现:原岩为沉积岩的石榴石石英片岩形成于晚泥盆纪;3个锆石变质壳谐和/近谐和年龄表明碰撞事件发生在(233±4)Ma左右;花岗质片麻岩原岩为同构造侵位的花岗岩,其8个锆石增生年龄显示的是深熔作用的时间,为(206±3)Ma。这些研究成果对重建南海北缘琼南缝合带在研究区内的演变历史具有重要意义。
[Abstract]:In order to obtain the collision time of the northern and southern Qiongnan suture belt of the South China Sea, LA-ICP-MS zircon U-Pb dating was carried out for the middle and high grade metamorphic garnet quartz schist and granitic gneiss collected in the eastern segment of Jiushengshui.The experimental results show that garnet quartz schist with sedimentary rocks was formed in the late Devonian, three zircon metamorphic crust harmonic / near harmonic ages indicated that the collision event occurred around #number0# 卤4)Ma, and the granitic gneiss was a syntectonic emplacement granite.The age of 8 zircon accretion shows the time of deep melting, which is 206 卤3 Ma.These results are of great significance for reconstructing the evolutionary history of the Qiongnan suture zone in the northern margin of the South China Sea.
【作者单位】：中国科学院南海海洋研究所边缘海与大洋地质重点实验室;中国科学院大学;
【基金】：国家自然科学基金项目(41276048;91328205;41476039;41206035) “中国海及邻域地质地球物理及地球化学系列图”项目(GZH200900504-WX02)
【分类号】：P597.3;P736.1

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