• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Provenance of Jurassic sediments in the Hefei Basin, east-central China and the contribution of high-pressure and ultrahigh-pressure metamorphic rocks from the Dabie Shan
【24h】

Provenance of Jurassic sediments in the Hefei Basin, east-central China and the contribution of high-pressure and ultrahigh-pressure metamorphic rocks from the Dabie Shan

机译：中东部合肥盆地侏罗纪沉积物来源及大别山高压超高压变质岩的贡献

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The provenance of the Jurassic sediments in the Hefei Basin is constrained by compositions of the detrital K-white micas and garnets, and SHRIMP dating of the detrital zircons, which can help to understand the evolution and to reconstruct the paleogeographic distribution of HP-UHP rocks in the Jurassic Dabie Shan. (1) For the oldest Mesozoic sediments at the bottom of the Fanghushan Formation (J(1)), the predominance of the early Paleozoic and Luliang (1700-1900 Ma) zircons indicates a major source from the North China Block. However, Neoproterozoic zircons as the major component in other Jurassic sediments indicate that the source rocks were mainly derived from the exhumed Yangtze Block in the Dabie Shan. (2) The co-occurrence of high-Si phengites and Triassic zircons provides stratigraphic evidence that the first exposure of the UHP rocks at the Earth's surface in the Dabie Shan occurred in the Early Jurassic during deposition of the Fanghushan Formation. (3) From the cast to the west of the Hefei Basin, there is a spatial variation in the compositions for detrital micas and garnets, and in the U-Pb ages of detrital zircons. Evidently, HP-UHP rocks were widely distributed at outcrop in the eastern Dabie Shan. In contrast, they were less important in the western Dabie Shan during the Jurassic. (c) 2004 Elsevier B.V. All rights reserved.
机译：合肥盆地侏罗纪沉积物的来源受到碎屑K-白云母和石榴石的成分以及碎屑锆石的SHRIMP定年的限制，这有助于了解其演化并重建HP-UHP岩石的古地理分布在侏罗纪的大别山。 （1）对于房虎山组（J（1））底部最古老的中生代沉积物，早古生代和陆良（1700-1900 Ma）锆石的优势表明是华北地块的主要来源。然而，新元古代锆石是其他侏罗纪沉积物中的主要成分，这表明烃源岩主要来自大别山的扬子地块。 （2）高硅变质岩和三叠纪锆石的共生提供了地层学证据，即大别山地表超高压岩石的首次暴露发生在房虎山组沉积的侏罗纪早期。 （3）从合肥盆地西部的铸件开始，碎屑云母和石榴石的成分以及碎屑锆石的U-Pb年龄都有空间变化。显然，HP-UHP岩石广泛分布在大别山东部的露头。相反，在侏罗纪时期，它们在西部大别山的重要性较低。 （c）2004 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号