...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >Late Jurassic fluvial-eolian deposits from the Tianchihe Formation, Ningwu-Jingle Basin, Shanxi Province, China
【24h】

Late Jurassic fluvial-eolian deposits from the Tianchihe Formation, Ningwu-Jingle Basin, Shanxi Province, China

机译：中国山西宁武-金格尔盆地天池河组晚侏罗世河风沉积

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

Eolian systems were widespread in China in the Cretaceous. However, the reports of pre-Cretaceous eolian and its related systems are scarce, which prohibits studying the construction, accumulation and preservation of eolian systems as well as its allogenic and autogenic controlling factors. In this paper, we report on fluvial-eolian successions from the Late Jurassic Tianchihe Formation in the Ningwu-Jingle Basin. These successions represent the oldest reported inland fluvial-eolian systems in China. Fourteen lithofacies types are recognized in the Tianchihe Formation and have been grouped into six facies associations, including meandering fluvial channel, levee and overbank in the lower part, and eolian sandsheet, eolian dune, ephemeral fluvial channel and floodplain in the upper part. The fluvial system comprises a series of wetting upward cycles, which indicate humid climate culminating in high precipitation and shallow water table level. Eolian dune deposits composed of grainflow, grainfall, wind ripple strata and pin stripe laminations currently implies that all deposits types are internally bounded by reactivation surface and superimposition surface, suggesting compound dunes or drags. Eolian sandsheet deposits consist dominantly of subcritical climbing translatent strata and pin stripe lamination. The association of eolian dune and eolian sandsheet is development of a dry eolian system. Twelve drying upward cycles mainly composed of eolian sandsheet-eolian dune successions and four wetting upward cycles consisting of eolian sandsheet/dune-ephemeral fluvial channel/floodplain successions occur in the eolian system. These repeated cycles likely reflect an evolving erg system directly controlled by sediment supply, sediment availability and relative water table. The vertical transition from fluvial to eolian systems indicate a local climatic oscillation from relatively humid to arid conditions, which may be related with the uplift of the East China Plateau in the Late Jurassic.
机译：风尘系统在中国白垩纪很普遍。但是，关于白垩纪前风积及其相关系统的报道十分稀少，这使得人们无法研究风积系统的构建，积累和保存及其异源和自生控制因素。在本文中，我们报道了宁武-金格尔盆地晚侏罗世天池河组的河流风演。这些演替代表了中国最古老的内陆河风系统。天池河组中识别出14种岩相类型，分为6个岩相组合，下部为蜿蜒的河道，大堤和堤岸，上部为风积砂岩，风沙丘，短暂河道和洪泛区。河流系统包括一系列向上的润湿周期，表明潮湿的气候最终导致高降水量和浅水位。风沙丘沉积物由谷粒流，谷粒沉降，风波纹地层和针状条带叠层组成，目前意味着所有沉积物类型都在内部受活化面和叠加面的限制，表明存在复合沙丘或阻力。风积砂岩沉积物主要由亚临界爬升平移地层和针状条纹叠层组成。风沙丘和风沙盘的结合是一种干燥风沙系统的发展。在风积系统中，主要由风积砂-风沙丘演替组成的十二个干燥上升周期和四个由风积砂/沙丘-短暂河道/洪泛平原演替组成的湿润上升周期为四个。这些重复的循环可能反映了不断演变的erg系统，该系统直接受沉积物供应，沉积物可利用性和相对水位控制。从河流系统到风沙系统的垂直过渡表明从相对潮湿到干旱条件的局部气候振荡，这可能与侏罗纪晚期华东高原的隆升有关。

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