...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Latest Paleozoic-Early Mesozoic basin-range interactions in South Tian Shan (northwest China) and their tectonic significance: Constraints from detrital zircon U-Pb ages
【24h】

Latest Paleozoic-Early Mesozoic basin-range interactions in South Tian Shan (northwest China) and their tectonic significance: Constraints from detrital zircon U-Pb ages

机译：南天山（中国西北地区）最新的古生代-早中生代盆地-地层相互作用及其构造意义：碎屑锆石U-Pb年龄的约束

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

Since the Late Cenozoic, the Tian Shan area, as for most ranges in continental Asia is rejuvenated by the far-field effects of the India-Asia collision. However, the tectonic processes that affected the area prior to the Cenozoic are still poorly known, especially in the South Tian Shan block. An extensive record of this earlier tectonic history is provided by the thick Paleozoic to Mesozoic sedimentary sequences preserved in the Kapushaliang and Heiyingshan sections in southern Tian Shan. U-Pb (LA-ICP-MS) dating of detrital zircons from eight sandstone samples from these two close sections ranging in age from latest Paleozoic to Early Mesozoic is used to investigate changes in sediment provenance through time and to correlate them with major tectonic phases in the range. The results show that the detrital zircons are mostly magmatic in origin, with some minor metamorphic input. The U-Pb detrital zircon ages range widely from 224 to 3320. Ma and can be statistically divided into four main groups: 224-250. Ma (4%), 251-380. Ma (40%), 380-520. Ma (35%) and 545-3320. Ma (21%). Data analysis associated to already published sedimentary and geochronology information indicate that the zircons were largely derived from the Tian Shan area to the north since the Permian initiation of the basin. From latest Paleozoic to Early Mesozoic, the sediment provenance and basin-range pattern evolution of South Tian Shan can be generally divided into two stages: (1) during Early Permian, the South Tian Shan basin was in a half-graben most probably post-orogenic extensional context. (2) From Late Permian to Early Jurassic times, the South Tian Shan became a passively subsiding basin, with a geographically wider source area characterized by a relatively low topography.
机译：自晚新生代以来，天山地区，以及亚洲大陆大部分地区，都因印度-亚洲碰撞的远场影响而焕然一新。但是，影响新生代之前地区的构造过程仍然知之甚少，尤其是在南天山地块。在天山南部的卡普沙梁和黑营山段保存的厚的古生代至中生代沉积层序提供了较早的构造历史的广泛记录。从最近古生代到早中生代两个年龄段的八个近距离剖面的八个砂岩样品中的碎屑锆石的U-Pb（LA-ICP-MS）年代，用于研究随时间的沉积物来源变化并将其与主要构造相联系起来。在范围中。结果表明，碎屑锆石的来源多为岩浆，有少量的变质输入。 U-Pb碎屑锆石的年龄范围从224到3320。Ma可以从统计学上分为四个主要组：224-250。马（4％），251-380。马（40％），380-520。马（35％）和545-3320。马（21％）。与已经公布的沉积和年代学信息相关的数据分析表明，自盆地二叠纪开始以来，锆石主要来自北部的天山地区。从最新古生代到早中生代，南天山盆地的沉积物源和盆地分布模式的演化大致可分为两个阶段：（1）在二叠纪早期，南天山盆地处于半透明的状态，很可能是后造山带扩张背景。 （2）从二叠纪晚期到侏罗纪早期，南天山成为被动沉降盆地，其源区地理范围较宽，地势相对较低。

著录项

相似文献

  • 外文文献
  • 中文文献
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