• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Paleoceanography >Chronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land Margin: Constraints for paleoceanographic reconstruction
【24h】

Chronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land Margin: Constraints for paleoceanographic reconstruction

机译：威尔克斯地缘的IODP远征318岩心的时间地层学框架：古海洋重建的限制

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 Integrated Ocean Drilling Program Expedition 318 to the Wilkes Land margin of Antarctica recovered a sedimentary succession ranging in age from lower Eocene to the Holocene. Excellent stratigraphic control is key to understanding the timing of paleoceanographic events through critical climate intervals. Drill sites recovered the lower and middle Eocene, nearly the entire Oligocene, the Miocene from about 17Ma, the entire Pliocene and much of the Pleistocene. The paleomagnetic properties are generally suitable for magnetostratigraphic interpretation, with well-behaved demagnetization diagrams, uniform distribution of declinations, and a clear separation into two inclination modes. Although the sequences were discontinuously recovered with many gaps due to coring, and there are hiatuses from sedimentary and tectonic processes, the magnetostratigraphic patterns are in general readily interpretable. Our interpretations are integrated with the diatom, radiolarian, calcareous nannofossils and dinoflagellate cyst (dinocyst) biostratigraphy. The magnetostratigraphy significantly improves the resolution of the chronostratigraphy, particularly in intervals with poor biostratigraphic control. However, Southern Ocean records with reliable magnetostratigraphies are notably scarce, and the data reported here provide an opportunity for improved calibration of the biostratigraphic records. In particular, we provide a rare magnetostratigraphic calibration for dinocyst biostratigraphy in the Paleogene and a substantially improved diatom calibration for the Pliocene. This paper presents the stratigraphic framework for future paleoceanographic proxy records which are being developed for the Wilkes Land margin cores. It further provides tight constraints on the duration of regional hiatuses inferred from seismic surveys of the region.
机译：到南极威尔克斯陆地边缘的318号综合海洋钻探计划远征队恢复了从下始新世到全新世的沉积层序。良好的地层控制是通过关键气候间隔了解古海洋事件时间的关键。钻探地点恢复了下中新世，几乎整个渐新世，大约17Ma的中新世，整个上新世和大部分更新世。古磁特性通常适用于地磁地层学解释，具有良好的退磁图，磁偏角的均匀分布以及清楚地分成两种倾斜模式。尽管由于取芯而使序列不连续地恢复，并且有许多空隙，并且沉积和构造过程中存在中断，但是地磁地层模式通常很容易解释。我们的解释与硅藻，放射虫，钙质纳米化石和鞭毛藻囊肿（恐龙囊）生物地层学相结合。磁地层学显着提高了年代地层学的分辨率，特别是在生物地层控制较差的时期。但是，具有可靠地磁学的南大洋记录尤为稀少，这里报告的数据为改进生物地层学记录的校准提供了机会。特别是，我们为古近纪中的狄诺氏囊生物地层学提供了罕见的磁地层学标定，并为上新世提供了显着改善的硅藻标定。本文介绍了为威尔克斯地缘岩心开发的未来古海洋代用记录的地层框架。它进一步限制了根据该地区地震勘测推断的地区中断的持续时间。

著录项

相似文献

  • 外文文献
  • 中文文献
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