Knowledge Resource Center for Ecological Environment in Arid Area
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. |
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