...
  • 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 >Constraints on the nature of the Marinoan glaciation: Cyclic sedimentary records from the Nantuo Formation, South China
【24h】

Constraints on the nature of the Marinoan glaciation: Cyclic sedimentary records from the Nantuo Formation, South China

机译：马里诺冰川作用的性质约束：来自中国南方南拓组的循环沉积记录

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

Detailed sedimentological investigations of the Cryogenian glacial deposits are critical for constraining the true nature of the Sturtian and Marinoan glaciations. The entire succession of the Nantuo Formation, which corresponds to the Marinoan glaciation, is well developed in South China. Here a detailed lithological and sedimentological analysis of two cores of the Nantuo Formation in Guizhou, South China, is presented in which two continuous ice advance-retreat cycles are identified. The base consists of a massive diamictite lithofacies that is representative of glacier-dominated subaqueous debris flow deposits. These proximal glaciomarine deposits are overlain by a gravel-free sandy mudstone lithofacies that is lacking in diamictites, which implies distal glaciomarine deposits. This ice advance-retreat sedimentary cycle is overlain by a weakly laminated diamictite lithofacies, which represents subaqueous debris flow deposits that formed during the second episode of ice advance. These proximal glaciomarine deposits are overlain by an interbedded sandstone-mudstone lithofacies, which is indicative of distal glaciomarine deposits that formed during another episode of ice retreat. These sedimentary cycles imply that the climate switched twice from relatively warm to extremely cold and back during the Marinoan glaciation. The global sea-level and sedimentary environments fluctuated in response to these climate changes. This co-evolution of the climate, sea-level, and sedimentary environments, which is represented by the lithofacies and sedimentary sequence of the Nantuo Formation, as well as the corresponding strata of other sections worldwide, suggests that the Marinoan glaciation is characterized by a progressive and dynamic course.
机译：对低温冰河沉积物进行详细的沉积学调查对于限制斯特里特和马里诺期冰川的真实性质至关重要。南海组的整个演替都对应着马里诺期的冰期作用，在华南地区发育得很好。在此，对中国南方贵州南投组两个岩心的岩心和沉积学进行了详细分析，确定了两个连续的进退冰循环。该基地由大量的铁矾石岩相组成，代表了以冰川为主导的水下泥石流沉积物。这些近端的冰川海洋沉积物被铁砂石所缺乏的无砾石的砂质泥岩岩相所覆盖，这暗示着远端的冰川海洋沉积物。这种退冰-退冰的沉积循环被薄弱的叠氮化铁矿岩相覆盖，这表示在第二次进冰期间形成的水下泥石流沉积物。这些近端的冰川海洋沉积物被互层的砂岩-泥岩岩相覆盖，这表明在另一次冰撤退期间形成了远端的冰川海洋沉积物。这些沉积循环表明，在马力诺冰川期，气候从相对温暖到极冷再两次转变。全球海平面和沉积环境随这些气候变化而波动。这种气候，海平面和沉积环境的共同演化（以南拓组的岩相和沉积序列以及全球其他地区的相应地层为代表）表明，马里诺期冰川化的特征是进步和动态的过程。

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