Ostracod Mg/Sr/Ca and 87Sr/86Sr geochemistry from Tibetan lake sediments: Implications for early to mid-Pleistocene Indian monsoon and catchment weathering | |
MIKE J.BICKLE; MERVYN J.GREAVES; J. M. Yu; HAZEL J. CHAPMAN; S. M. Wang; Z. D. Jin; Z. S. An | |
刊名 | Boreas
![]() |
2011 | |
卷号 | 40期号:2页码:320-331 |
英文摘要 | Lacustrine sediment serves as a valuable archive for tracing catchment weathering processes associated with past climatic and/or tectonic changes. High-resolution records of fossil ostracod Mg/Ca, Sr/Ca and 87Sr/86Sr ratios from a lake sediment core from the central Tibetan Plateau reveal a temporal link between lake-water chemistry and catchment weathering and distinct monsoonal oscillations over the early to mid-Pleistocene. Between 2.01 and 0.95 Ma, lake-water chemistry was dominated by a high proportion of carbonate weathering related to variations in the Indian monsoon, resulting in relatively low and constant ostracod 87Sr/86Sr but obvious fluctuations in Mg/ Ca, Sr/Ca and d18O. Across the mid-Pleistocene transition (MPT), a significant increase in 87Sr/86Sr and frequently fluctuating ratios of ostracod Mg/Ca, Sr/Ca and d18O are coincident with increases in both Chinese loess grain size and Arabian Sea lithogenic flux. This correlation indicates an increased glaciation and a strong monsoon seasonal contrast over the plateau. The increase in lake-water 87Sr/86Sr across the MPT highlights a change in catchment weathering patterns, rather than one in climate-enhanced weathering intensity, with an increased weathering of 87Sr-rich minerals potentially induced by marked extensive glaciation and strong seasonality in the central plateau. |
学科主题 | 地质学 ; 地球化学 ; 环境科学 |
语种 | 英语 |
WOS记录号 | WOS:000288759400008 |
公开日期 | 2011-10-19 |
内容类型 | 期刊论文 |
源URL | [http://210.72.146.199/handle/361006/2533] ![]() |
专题 | 地球环境研究所_加速器质谱中心 |
推荐引用方式 GB/T 7714 | MIKE J.BICKLE,MERVYN J.GREAVES,J. M. Yu,et al. Ostracod Mg/Sr/Ca and 87Sr/86Sr geochemistry from Tibetan lake sediments: Implications for early to mid-Pleistocene Indian monsoon and catchment weathering[J]. Boreas,2011,40(2):320-331. |
APA | MIKE J.BICKLE.,MERVYN J.GREAVES.,J. M. Yu.,HAZEL J. CHAPMAN.,S. M. Wang.,...&Z. S. An.(2011).Ostracod Mg/Sr/Ca and 87Sr/86Sr geochemistry from Tibetan lake sediments: Implications for early to mid-Pleistocene Indian monsoon and catchment weathering.Boreas,40(2),320-331. |
MLA | MIKE J.BICKLE,et al."Ostracod Mg/Sr/Ca and 87Sr/86Sr geochemistry from Tibetan lake sediments: Implications for early to mid-Pleistocene Indian monsoon and catchment weathering".Boreas 40.2(2011):320-331. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论