Ostracod Mg/Sr/Ca and 87Sr/86Sr geochemistry from Tibetan lake sediments: Implications for early to mid-Pleistocene Indian monsoon and catchment weathering

	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.