...
首页> 外文期刊>Geochemical Journal >Sr—Nd isotope composition of the Bay of Bengal sediments:Impact of climate on erosion in the Himalaya
【24h】

Sr—Nd isotope composition of the Bay of Bengal sediments:Impact of climate on erosion in the Himalaya

机译:孟加拉湾沉积物中Sr-Nd同位素组成:喜马拉雅山气候对侵蚀的影响

获取原文
获取原文并翻译 | 示例
           

摘要

A temporal high-resolution analysis of Sr–Nd isotopic composition, Fe, Al and V concentration and magnetic suscep-tibility (MS) has been carried out in a sediment core from the western Bay of Bengal to trace sediment sources. Significant variations in the Sr and Nd isotopic composition and corresponding MS and elemental Fe/Al and V/Al ratios are observed in the sediment core with depth (time) indicating variable contributions from sources. The observed changes in the sedi-ment provenance correlate well with the climatic record of the region, highlighting the important influence of climate over erosion. Relatively lower ~(87)Sr/~(86)Sr and higher ε_(Nd) corresponding to the Last Glacial Maximum (LGM) suggests proportionally reduced sediment contribution from the Himalaya. Erosion rate over the Himalaya decreased during LGM due to combined influence of reduced intensity of the southwest monsoon and larger extent of glaciations over the Higher Himalaya, the main source of sediments to the Bay of Bengal.
机译:对孟加拉西部海湾的一个沉积岩心进行了Sr-Nd同位素组成,Fe,Al和V浓度以及磁化率(MS)的时空高分辨率分析,以追踪沉积物来源。在沉积岩心中观察到了Sr和Nd同位素组成以及相应的MS以及元素Fe / Al和V / Al比的显着变化,其深度(时间)表明了来源的不同贡献。观测到的沉积物来源的变化与该地区的气候记录密切相关,突出了气候对侵蚀的重要影响。相对较低的〜(87)Sr /〜(86)Sr和较高的ε_(Nd)对应于最后冰川最大值(LGM),表明喜马拉雅山的泥沙贡献成比例降低。在LGM期间,由于西南季风强度降低和喜马拉雅山(孟加拉湾的主要沉积物来源)上更大程度的冰川作用的综合影响,喜马拉雅山的侵蚀率下降。

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