• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >The unusual sedimentary rock record of the Early Triassic: Anachronistic facies in the western United States and southern Turkey.
【24h】

The unusual sedimentary rock record of the Early Triassic: Anachronistic facies in the western United States and southern Turkey.

机译：三叠纪早期的不寻常沉积岩记录：美国西部和土耳其南部的时代时代相。

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 end-Permian mass extinction occurred ∼251 million years ago and represents the largest extinction in the history of life. Following end-Permian mass extinction, a large-scale reorganization of marine communities occurred after a delay of 4--7 million years. To better understand why this recovery was delayed, the Early Triassic has been widely studied to understand the mechanisms responsible for the suppression of metazoans during this time. The widespread occurrence of anachronistic facies has been documented globally from Lower Triassic sections. Anachronistic facies are facies that commonly formed in marine environments much earlier in time (Proterozoic-Ordovician) and thereafter became geologically rare for hundreds of millions of years. Anachronistic facies include microbial reefs, carbonate seafloor fans, flat-pebble conglomerates, and wrinkle structures. In addition to true anachronistic facies, a variety of other unusual facies are reported and described here. The unusual resurgence of anachronistic facies in the Early Triassic has been documented in this research from the Spathian Virgin Limestone of the Moenkopi Formation and Union Wash Formation, southwestern United States and the Griesbachian Katarsi, Kokarkuyu, and Sapdere Formations from southern Turkey. Anachronistic facies occur at two intervals of time that bracket the Early Triassic, and this indicates that prolonged stressful environmental conditions such as low oxygen levels and carbon dioxide poisoning persisted through much of the Early Triassic. These conditions would have suppressed the recovery of metazoans, and this suppression is reflected in the low diversity of organisms as well as low levels of bioturbation. As part of this study, trends in bioturbation were documented from Lower Triassic sections in the southwestern United States. The results of this study illustrated that equatorial regions likely recovered more slowly from the end-Permian mass extinction than mid-high latitudes. Through study of anachronistic facies and the unique bioturbation record of the latest Early Triassic, it can be concluded that deleterious environmental conditions played a role both in the formation of the anachronistic facies and the suppression of marine organisms. This suppression likely delayed the biotic recovery from the end-Permian mass extinction.
机译：二叠纪末的大灭绝发生在大约2.51亿年前，是生命史上最大的一次大灭绝。在二叠纪末期大灭绝之后，延迟了4--7百万年，海洋社区发生了大规模的重组。为了更好地理解为什么恢复迟缓，对三叠纪早期进行了广泛的研究，以了解这段时期内抑制后生动物的机制。下三叠纪地区已广泛记录了时代错相的广泛存在。过时相是通常在海洋环境中较早地形成的（元古代-奥陶纪）相，其后在数亿年的地质上变得稀少。过时相包括微生物礁，碳酸盐海底扇，扁平卵石砾岩和皱纹结构。除了真正的过时相，这里还报告和描述了各种其他不寻常相。这项研究已从Moenkopi地层和Union Wash地层的Spathian初生石灰岩，美国西南部以及土耳其南部的Griesbachian Katarsi，Kokarkuyu和Sapdere地层中记录了早三叠世异常时代相的异常复苏。过时相出现在三叠纪早期的两个时间间隔内，这表明长期的压力环境条件（如低氧水平和二氧化碳中毒）在整个三叠纪中持续存在。这些条件将抑制后生动物的恢复，这种抑制作用体现在生物多样性低以及生物扰动水平低下。作为这项研究的一部分，从美国西南部的下三叠纪剖面记录了生物扰动的趋势。这项研究的结果表明，与中高纬度地区相比，赤道地区从二叠纪末期大灭绝中恢复的速度可能更慢。通过研究时代相和最新的早三叠世独特的生物扰动记录，可以得出结论，有害的环境条件在时代相的形成和海洋生物的抑制中都起着作用。这种抑制作用可能延迟了二叠纪末生物大灭绝的生物恢复。

著录项

  • 作者

    Pruss, Sara Brady.;

  • 作者单位

    University of Southern California.;

  • 授予单位 University of Southern California.;
  • 学科 Paleontology.; Geology.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 286 p.
  • 总页数 286
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 古生物学;地质学;
  • 关键词

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