...
  • 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 >Lithostratigraphy of the Middle Eocene Dammam Formation in Qatar, Arabian Gulf: effects of sea-level fluctuations along a tidal environment
【24h】

Lithostratigraphy of the Middle Eocene Dammam Formation in Qatar, Arabian Gulf: effects of sea-level fluctuations along a tidal environment

机译：阿拉伯湾卡塔尔中始新世达曼岩层的地层学：潮汐环境下海平面波动的影响

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 Middle Eocene Dammam Formation dominates the surface exposure of Qatar. It consists of shales followed by limestone and is topped by dolomitic limestone. It is subdivided, from oldest to youngest, into the Midra Shale, Dukhan, Umm Bab and Abaruq members. Three patterns of fades dominate the formation. Shale-marl facies in the lower part, mudstone/wackestone/packstone facies in the middle part and argillaceous dolomitic wackestone/packstone facies in the upper part. The main fauna of the Dammam Formation include Nummulites, Alveolines, Linderines, shark teeth, molluscs and echinoderms. The Nummulites species are common, particularly within the middle members (Dukhan and Umm Bab members). Coarsening-upward parasequences reflect the cyclicity of the Eocene Dammam Formation in Qatar. At least three short-lived transgressive/regressive cyclothems can be recognized in sediments of the formation. These small-scale cycles resulted from fluctuations in sea level. A local hiatus is believed to separate these cycles in northeastern Qatar. A warm shallow marine environment was predominant as indicated by extensive dolomitization and the presence of Alveolines, Linderines and Nummulites with globular tests.
机译：中始新世达曼组占卡塔尔地面暴露的主要部分。它由页岩，石灰岩和白云质石灰岩组成。从最老到最年轻，它细分为Midra页岩，Dukhan，Umm Bab和Abaruq成员。褪色的三种模式占主导地位。下部为泥页岩相，中部为泥岩/砂岩/堆积岩相，上部为泥质白云质砂岩/堆积岩相。达曼岩层的主要动物群包括：云母，肺泡，林德林，鲨鱼齿，软体动物和棘皮动物。 Nummulites物种很常见，特别是在中层成员（Dukhan和Umm Bab成员）内。粗略向上的副层序反映了卡塔尔始新世达曼形成的周期性。在地层的沉积物中至少可以识别出三个短寿命的海侵/回归环。这些小规模的循环是由于海平面的波动造成的。据信，卡塔尔东北部的局部裂隙将这些周期分隔开来。广泛的白云石化作用以及以球状试验发现的海泡石，林德林和褐云母表明，这里是温暖的浅海环境。

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