...
  • 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 >Stratigraphy and ammonite fauna of the upper Shemshak Formation (Toarcian-Aalenian) at Tazareh, eastern Alborz, Iran
【24h】

Stratigraphy and ammonite fauna of the upper Shemshak Formation (Toarcian-Aalenian) at Tazareh, eastern Alborz, Iran

机译：伊朗东部阿尔伯兹的塔扎雷赫上闪姆沙克组（Toarcian-Aalenian）的地层学和mon虫动物区系

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

With a thickness of 3900 m, the Tazareh section is one of the thickest developments of the Shemshak Formation in the Alborz range. It overlies with sharp and disconformable contact the limestones and dolomites of the Lower-Middle Triassic Elikah Formation and is topped, again with a disconformable contact, by the marls and limestones of the Middle Jurassic Dalichai Formation. The nearly exclusively siliciclastic succession represents a range of environments, from fluvial channels, flood plains, swamps and lake systems to storm-dominated shelf, and a comparatively deep marine and partly dysoxic basin. The segment of the section between 2300 and 3500 m is exclusively marine and contains a moderately diverse ammonite fauna, ranging from the Middle Toarcian to the Upper Aalenian. The ammonite fauna comprises 21 taxa, among them the new genus Shahrudites with two new species, Shahrudites asseretoi and S. stoecklini from the Middle Aalenian Bradfordensis Zone. The other ammonites from the Shemshak Formation at Tazareh (as elsewhere in North and Central Iran) are exclusively Tethyan in character and closely related to faunas from western and central Europe. An ammonite-based correlation of Toarcian-Aalenian successions of the eastern Alborz with time-equivalent strata of the Lut Block, part of the Central-East Iranian Microcontinent (ca. 500 km to the south), suggests a strong influence of synsedimentary tectonics during the deposition of the upper Shemshak Formation.
机译：Tazareh断面厚度为3900 m，是Alborz山脉的Shemshak组最厚的发育之一。它与上中下三叠统伊利卡组的石灰岩和白云岩形成尖锐且不可变形的接触，并被侏罗系中段达利猜组的泥灰岩和石灰岩再次覆盖，并形成不规则的接触。几乎唯一的硅质碎屑演替代表了各种环境，从河道，洪泛平原，沼泽和湖泊系统到以风暴为主的架子，以及相对较深的海洋和部分缺氧盆地。 2300至3500 m之间的部分仅是海洋部分，包含中等多样性的am石动物群，范围从中Toarcian到Upper Aalenian。 mon生物群包括21个分类单元，其中包括新的Shahrudites属，其中有两个新物种Shahrudites asseretoi和S. stoecklini来自中亚伦尼亚布拉德福德地区。 Tazareh（与伊朗北部和中部的其他地方）的Semshak组中的其他炸药的特征完全是Tethyan，并且与西欧和中欧的动物区系密切相关。阿尔伯兹东部Toarcian-Aalenian演替与伊朗中东部微大陆（南部约500公里）一部分Lut块的时间等效地层的基于铵铁矿的相关性表明，在此期间，同沉积构造强烈影响Shemshak上层的沉积。

著录项

相似文献

  • 外文文献
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