气候变化领域集成服务门户(CCPortal): Early-Middle Eocene Hydroclimate Variations Recorded by Environmental Magnetism in the Linxia Basin, NE Tibetan Plateau

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DOI	10.1029/2021PA004338
	Early-Middle Eocene Hydroclimate Variations Recorded by Environmental Magnetism in the Linxia Basin, NE Tibetan Plateau
	Feng, Zhantao; Zhang, Weilin; Zhang, Tao; Fang, Xiaomin; Zan, Jinbo; Yan, Maodu; Song, Chunhui; Li, Tao; Ning, Wenxiao; Wang, Hong
通讯作者	Zhang, WL (通讯作者)
发表日期	2021
ISSN	2572-4517
EISSN	2572-4525
卷号	36 期号:11
英文摘要	Although Neogene climate change reconstruction in central Asia is important for understanding global cooling, Asian monsoon evolution, and the Tibetan Plateau stepwise uplift during the Cenozoic, the paleoenvironmental evolution during the Paleogene in this region is still ambiguous due to a lack of corresponding continuous and complete terrestrial records with precise age constraints. Recently, a new fluvial sedimentary sequence with magnetostratigraphic ages spanning from similar to 53 to 40 Ma was found in the Linxia Basin, NE Tibetan Plateau, thereby providing a window to understand Eocene climate change in the Asian interior. From this fluvial sedimentary sequence, we present early-middle Eocene hydroclimate variations based on a combined method of rock magnetism and diffuse reflectance spectroscopy. Our results show magnetic enhancement of fluvial sediments at 51.7 Ma resulted from abundant single-domain magnetite inputs from the surrounding mountains through strong erosion and transport in a relatively wet environment. Subsequently, at 47.6 Ma, magnetic weakening of floodplain sediments corresponds to an increase in hematite concentrations produced via low-temperature oxidation in a prolonged dry environment. Comparisons of paleoclimatic proxies, such as organic geochemistry and rock magnetism from neighboring basins, tectonic deformation of the NE Tibetan Plateau, and sea level change in the Paratethys Sea suggest that the hydroclimate variation from relatively wet to dry climate in the early-middle Eocene in this area was mainly controlled by global climatic change and probably superimposed by the uplift of the Tibetan Plateau.
关键词	NORTHERN QAIDAM BASIN XINING BASIN NORTHEASTERN TIBET ASIAN MONSOONS MAGNETOSTRATIGRAPHY CLIMATE UPLIFT ARIDIFICATION CONSTRAINTS OLIGOCENE
英文关键词	early-middle Eocene; NE Tibetan Plateau; environmental evolution; rock magnetism; diffuse reflectance spectroscopy
语种	英语
WOS研究方向	Geology ; Oceanography ; Paleontology
WOS类目	Geosciences, Multidisciplinary ; Oceanography ; Paleontology
WOS记录号	WOS:000722490500005
来源期刊	PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260124
推荐引用方式 GB/T 7714	Feng, Zhantao,Zhang, Weilin,Zhang, Tao,et al. Early-Middle Eocene Hydroclimate Variations Recorded by Environmental Magnetism in the Linxia Basin, NE Tibetan Plateau[J]. 中国科学院青藏高原研究所,2021,36(11).
APA	Feng, Zhantao.,Zhang, Weilin.,Zhang, Tao.,Fang, Xiaomin.,Zan, Jinbo.,...&Wang, Hong.(2021).Early-Middle Eocene Hydroclimate Variations Recorded by Environmental Magnetism in the Linxia Basin, NE Tibetan Plateau.PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,36(11).
MLA	Feng, Zhantao,et al."Early-Middle Eocene Hydroclimate Variations Recorded by Environmental Magnetism in the Linxia Basin, NE Tibetan Plateau".PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY 36.11(2021).