Lake geochemistry reveals marked environmental change in Southwest China during the Mid Miocene Climatic Optimum

doi:10.1007/s11434-016-1095-x

	Lake geochemistry reveals marked environmental change in Southwest China during the Mid Miocene Climatic Optimum
	Lebreton-Anberree, Julie 1,2; Li, Shihu 3; Li, Shu-Feng 1,4; Spicer, Robert A.5; Zhang, Shi-Tao 6; Su, Tao 1; Deng, Chenglong 3; Zhou, Zhe-Kun1,7
	2016-06-01
发表期刊	SCIENCE BULLETIN
卷号	61 期号:11 页码:897-910
摘要	The Mid-Miocene Climatic Optimum (MMCO; similar to 15-17 Ma) was one of the short-term climatic warm events that punctuated the Cenozoic long-term cooling trend. Because there are very few terrestrial records of this event, most of our understanding comes from marine cores. In this report, we first present new palaeomagnetic data that revises the dating of our 400 m-thick lacustrine section in Wenshan (Yunnan), previously thought to be Late Miocene. These new data suggest an older age, ca. 15.2-16.5 Ma, coinciding with the MMCO. We measured delta C-13 on bulk organic matter (delta C-13(org)), total organic carbon (TOC), total nitrogen (TN) and C/N ratios at a high sample resolution to: (1) reconstruct the palaeoenvironmental changes in the lake catchment area, and (2) infer mechanisms responsible for these changes. Our results show that all four geochemical parameters demonstrate that a strong environmental change occurred around the middle of the section, shortly after the C5Cn/C5Br geomagnetic reversal and the Early/Middle Miocene boundary at 15.97 Ma. We propose that the environmental shift may be due to a combination of a change in climate, which became cooler, together with a change in organic matter cycling within the lake. This study provides a new insight into the MMCO and demonstrates that although the MMCO was generally a warm event, it was also a time of climatic instability and abrupt environmental changes.
关键词	Yunnan Mid-miocene Climatic Optimum Bulk Organic Carbon Isotopes (Delta C-13(Org)) C/n Ratio Toc
DOI	10.1007/s11434-016-1095-x
收录类别	SCI
语种	英语
WOS记录号	WOS:000377389700012
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/26272
专题	中国科学院东亚植物多样性与生物地理学重点实验室
作者单位	1.Chinese Acad Sci, Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, State Key Lab Paleobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China 5.Open Univ, Environm Earth & Ecosyst, Milton Keynes MK7 6AA, Bucks, England 6.Kunming Univ Sci & Technol, Fac Land Resource Engn, Kunming 650093, Peoples R China 7.Chinese Acad Sci, Kunming Inst Bot, Key Lab Biogeog & Biodivers, Kunming 650204, Peoples R China
推荐引用方式 GB/T 7714	Lebreton-Anberree, Julie,Li, Shihu,Li, Shu-Feng,et al. Lake geochemistry reveals marked environmental change in Southwest China during the Mid Miocene Climatic Optimum[J]. SCIENCE BULLETIN,2016,61(11):897-910.
APA	Lebreton-Anberree, Julie.,Li, Shihu.,Li, Shu-Feng.,Spicer, Robert A..,Zhang, Shi-Tao.,...&Zhou, Zhe-Kun.(2016).Lake geochemistry reveals marked environmental change in Southwest China during the Mid Miocene Climatic Optimum.SCIENCE BULLETIN,61(11),897-910.
MLA	Lebreton-Anberree, Julie,et al."Lake geochemistry reveals marked environmental change in Southwest China during the Mid Miocene Climatic Optimum".SCIENCE BULLETIN 61.11(2016):897-910.

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