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Ostracod Mg/Sr/Ca and 87Sr/86Sr geochemistry from Tibetan lake sediments: Implications for early to mid-Pleistocene Indian monsoon and catchment weathering
Z. D. Jin; MIKE J.BICKLE; HAZEL J. CHAPMAN; J. M. Yu; Z. S. An; S. M. Wang; MERVYN J.GREAVES
2011
Source PublicationBoreas
Volume40Issue:2Pages:320-331
Cooperation Status国际
AbstractLacustrine 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.
Subject Area地质学 ; 地球化学 ; 环境科学
Indexed BySCI
Language英语
WOS IDWOS:000288759400008
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/2533
Collection加速器质谱中心
Recommended Citation
GB/T 7714
Z. D. Jin,MIKE J.BICKLE,HAZEL J. CHAPMAN,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 Z. D. Jin.,MIKE J.BICKLE.,HAZEL J. CHAPMAN.,J. M. Yu.,Z. S. An.,...&MERVYN J.GREAVES.(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 Z. D. Jin,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.
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