...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Paleoceanography >Diagenetic behavior of barite in a coastal upwelling setting
【24h】

Diagenetic behavior of barite in a coastal upwelling setting

机译：沿海上升流环境中重晶石的成岩行为

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

Multiproxy data from ODP Hole 1017E (Point Conception, California) provide an excellent opportunity to examine the behavior of barium, within a well-characterized sedimentary system. Bariumexcess is generally considered to be a productivity proxy; however, in nearshore environments, Baexcess records can be compromised by both sediment provenance and barite remobilization. For the last 60 kyr, ODP Hole 1017E exhibits significant changes both in primary productivity driven by coastal upwelling and in the sediment redox chemistry of underlying sediments. Significant barite enrichment occurs at an active diagenetic front that marks the boundary between sulfate-rich and sulfate-poor pore waters. This boundary also intersects a sediment facies change from deposition of relatively coarse-grained sediment before 35 ka to an interval of fine-grained, organic-rich sediment after (i.e., Interstadial Event 8). Changes in diffusion rates associated with the sediment facies change cause a strong but misleading correlation between a mobile zone of barite enrichment and rapid climate change. Thus, within the Ba excess record at ODP Hole 1017E is a history of redox chemistry that has corrupted the paleoproductivity record of Babiogenic.
机译：来自ODP Hole 1017E（加利福尼亚州Point Conception）的多代理数据提供了一个很好的机会，可以在特征明确的沉积系统中检查钡的行为。钡过量通常被认为是生产力的代名词。但是，在近岸环境中，沉积物的来源和重晶石的迁移都会破坏Baexcess的记录。在过去的60年里，ODP孔1017E在沿海岸上升流驱动的初级生产力和下层沉积物的沉积物氧化还原化学上均表现出显着变化。重晶石富集发生在活跃的成岩作用前沿，标志着富硫酸盐和贫硫酸孔水之间的边界。该边界也与沉积相相交，从35 ka之前相对较粗颗粒的沉积物到之后的一定间隔的细颗粒，富含有机物的沉积物（即Interstadial事件8）变化。与沉积相变化相关的扩散速率变化导致重晶石富集活动区与快速气候变化之间存在强烈但具有误导性的相关性。因此，在ODP孔1017E处的Ba过量记录中，有氧化还原化学的历史，它破坏了成因的古生产力记录。

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