干旱区生态环境知识资源中心(Arid): Middle Miocene climate transition in the Tibetan Plateau: identification and significance

Arid

DOI	10.1017/S0016756821000893
	Middle Miocene climate transition in the Tibetan Plateau: identification and significance
	Song, Shijun; Huang, Lei; Zhang, Yongshu; Zhang, Qi; Zhou, Fei; Liu, Chiyang; Chen, Yan; Wu, Yingxiong; Zhang, Yiming
通讯作者	Huang, L (corresponding author), Northwest Univ, State Key Lab Continental Dynam, Xian, Peoples R China. ; Huang, L (corresponding author), Northwest Univ, Dept Geol, Xian 710069, Shaanxi, Peoples R China. ; Huang, L (corresponding author), Northwest Univ, Inst Oil & Gas Basin, Xian, Peoples R China.
来源期刊	GEOLOGICAL MAGAZINE
ISSN	0016-7568
EISSN	1469-5081
出版年	2022
卷号	159 期号:1 页码:153-172
英文摘要	The Middle Miocene Climatic Optimum is known for abrupt events during the global cooling trend of the past 20 Ma. Its identification in the Tibetan Plateau can help explain the cause of the critical Middle Miocene climate transition in Central Asia. In this study, fine-grained mixed sediments widely distributed in the Miocene Qaidam Lake in the northern Tibetan Plateau were used as a sensitive indicator for palaeoclimate. Their geochemical characteristics were investigated, together with an analysis of 2600 m long successive gamma-ray logging data from the whole JS2 drillcore, to understand the mid-Miocene climate transition in the Tibetan Plateau. By comparing the gamma-ray curve of the mixed sediments with global temperature, the Middle Miocene Climatic Optimum event can be easily identified. Further, the detailed petrological features and geochemical data of lacustrine fine-grained mixed sediments from a 400 m drillcore show oxidizing, high-sedimentation rate and brackish-saline water conditions in a semi-arid climate during the Middle Miocene period, demonstrating a dryer climate in the Qaidam Basin than in the monsoon-sensitive regions in Central Asia. These fine-grained mixed sediments have recorded climate drying before 15.3 Ma that represents a climatic transition within the Middle Miocene Climatic Optimum; increasing carbonate-rich mixed sediments, decreasing algal limestone layers and decreasing lacustrine organic matter are indicators of this transition. Regional tectonic events include the retreat of the Paratethys from Central Asia at similar to 15 Ma and the synchronous tectonic reorganization of the Altyn-Tagh fault system and the northeastern Tibetan Plateau. We find that global climate change is the primary factor affecting the overall characteristics and changes of the Neogene climate in the Qaidam Basin, including the occurrence of the Middle Miocene Climatic Optimum and the cooling and drying tendency, while the regional events are a secondary factor.
英文关键词	fine-grained mixed sediments Middle Miocene Climatic Optimum (MMCO) Yiliping Depression Qaidam Basin
类型	Review
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000725817900010
WOS关键词	ALTYN TAGH FAULT ; QAIDAM BASIN ; SEDIMENTARY-ROCKS ; TIANSHUI BASIN ; CHINESE LOESS ; CENTRAL-ASIA ; SEA-LEVEL ; GEOCHEMISTRY ; UPLIFT ; CONSTRAINTS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/374411
作者单位	[Song, Shijun; Huang, Lei; Zhang, Qi; Liu, Chiyang; Zhang, Yiming] Northwest Univ, State Key Lab Continental Dynam, Xian, Peoples R China; [Song, Shijun; Huang, Lei; Zhang, Qi; Liu, Chiyang; Zhang, Yiming] Northwest Univ, Dept Geol, Xian 710069, Shaanxi, Peoples R China; [Song, Shijun; Huang, Lei; Zhang, Qi; Liu, Chiyang; Zhang, Yiming] Northwest Univ, Inst Oil & Gas Basin, Xian, Peoples R China; [Zhang, Yongshu; Zhou, Fei; Chen, Yan; Wu, Yingxiong] Qinghai Oilfield Co, CNPC, Exploratory Dev Inst, Dunhuang 73200, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Song, Shijun,Huang, Lei,Zhang, Yongshu,et al. Middle Miocene climate transition in the Tibetan Plateau: identification and significance[J],2022,159(1):153-172.
APA	Song, Shijun.,Huang, Lei.,Zhang, Yongshu.,Zhang, Qi.,Zhou, Fei.,...&Zhang, Yiming.(2022).Middle Miocene climate transition in the Tibetan Plateau: identification and significance.GEOLOGICAL MAGAZINE,159(1),153-172.
MLA	Song, Shijun,et al."Middle Miocene climate transition in the Tibetan Plateau: identification and significance".GEOLOGICAL MAGAZINE 159.1(2022):153-172.