• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Facies >Compositional variations in calciturbidites and calcidebrites in response to sea-level fluctuations (Exuma Sound, Bahamas)
【24h】

Compositional variations in calciturbidites and calcidebrites in response to sea-level fluctuations (Exuma Sound, Bahamas)

机译：响应海平面波动，钙硅钙石和方解石的成分变化（埃克苏马海峡，巴哈马）

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 compositional variation of Pleistocene carbonate gravity deposits from the Exuma Sound Basin, Bahamas, was determined. Two types of gravity deposit were present in the cores of ODP Leg 101, Site 632A, i. e., calciturbidites and calcidebrites. In analogy with earlier studies, the compositional variations in the calciturbidites could be linked to different sources on the carbonate margin, i. e., platform interior, platform edge, and platform slope. Calciturbidites deposited during interglacial, sea-level highstands show a dominance of non-skeletal grains, largely derived from the platform interior, while calciturbidites of glacial, sea-level lowstands, show a dominance of skeletal platform-edge to platform-slope-derived grains. Thus, the calciturbidite composition can be used to reconstruct the position of absolute sea level. In addition, the mud content of the calciturbidites increased after Marine Isotope Stage 11. In contrast, the composition of the calcidebrites remained unaltered through time and showed a clear dominance of platform-edge-derived sediments during varying sea-level positions. The Bahamian carbonate platform is located in a tectonically stable passive-margin setting and the gravity-flow deposits were laid down in an environment exclusively controlled by eustatic sea-level fluctuations. This study shows that all types of gravity-induced carbonate deposits, calciturbidites, and calcidebrites, were deposited in response to global eustatic sea-level variations. The sediment composition could be linked directly to sediment input from specific facies realms along the carbonate platform margin. Hence, sediment composition analysis is a strong tool that may be used to discriminate between gravity-induced deposition triggered by eustatic sea-level changes and that related to tectonic events, when analyzing resedimentation processes in sedimentary basins.
机译：确定了来自巴哈马埃克苏马桑德盆地的更新世碳酸盐岩重力沉积物的组成变化。在ODP Leg 101（Site 632A，即ADP）的核心中存在两种重力沉积。例如钙铝矾石和方解石。与早期的研究类似，钙铝锰矿的成分变化可能与碳酸盐岩边缘的不同来源有关，即。例如，平台内部，平台边缘和平台坡度。在冰间期，海平面高位沉积的钙硅钙石显示出主要来自平台内部的非骨骼晶粒占主导地位，而冰川，海底低位的钙钙碳石显示出骨架平台边缘对源自平台坡度的晶粒占主导地位。因此，钙硅钙石的成分可以用来重建绝对海平面的位置。另外，在海洋同位素第11阶段之后，钙硅钙石的泥浆含量增加了。相反，方解石的组成在一段时间内保持不变，并且在不同的海平面位置上，平台边缘的沉积物表现出明显的优势。巴哈马碳酸盐岩台地处于构造稳定的被动边缘环境中，重力流沉积物是在完全由海平面波动来控制的环境中沉积的。这项研究表明，所有类型的重力诱导的碳酸盐矿床，钙长石和方解石都是响应于全球海平面变化而沉积的。沉积物组成可以直接与沿碳酸盐岩台地边缘的特定相域的沉积物输入有关。因此，当分析沉积盆地的再沉积过程时，沉积物成分分析是一种有力的工具，可用于区分由欣喜的海平面变化触发的重力诱导沉积和与构造事件有关的沉积。

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