气候变化领域集成服务门户(CCPortal): A late Pliocene to early Pleistocene (3.3-2.1 Ma) orbital chronology for the Qaidam Basin paleolake (NE Tibetan Plateau) based on the SG-1b drillcore record

CCPortal

DOI	10.1127/nos/2020/0555
	A late Pliocene to early Pleistocene (3.3-2.1 Ma) orbital chronology for the Qaidam Basin paleolake (NE Tibetan Plateau) based on the SG-1b drillcore record
	Kaboth-Bahr, Stefanie; Koutsodendris, Andreas; Lu, Yin; Nakajima, Kai; Zeeden, Christian; Appel, Erwin; Fang, Xiaomin; Roesler, Wolfgang; Friedrich, Oliver; Pross, Joerg
通讯作者	Kaboth-Bahr, S (通讯作者)
发表日期	2020
ISSN	0078-0421
起始页码	479
结束页码	496
卷号	53 期号:4
英文摘要	To contribute to a better understanding of Neogene climate evolution in Central Asia, we here present the first orbitally tuned time scale for a drillcore record from the Qaidam Basin (NE Tibetan Plateau) that consists of lacustrine sediments and spans the late Pliocene to early Pleistocene (similar to 3.3 to 2.1 Ma). Our tuning of Core SG-lb is based on the ln(Rb/Sr) ratio derived from XRF core scanning and grain-size distribution data that trace wet-dry climate alternations predominantly paced by orbital obliquity. Based on our ln(Rb/Sr) record, obliquity-precession interferences persisted during the mid-Pliocene warm period, but disappeared during the early Pleistocene. This could indicate that over the course of the late Pliocene a low-latitude-derived climate modulator gained an increasingly prominent role in shaping the environment of the Qaidam paleolake. At the same time, the consistent presence of the precession signal during the early Pleistocene hampers a refinement of the entire tuning on precession time scales. The inferred changes in sedimentation rate from the late Pliocene to the early Pleistocene indicate a long-term decrease in sediment supply into the Qaidam paleolake. This finding is in line with the previously proposed notion of a long-term aridification trend across the Plio-Pleistocene transition in Central Asia.
关键词	CENOZOIC TECTONIC EVOLUTION CLIMATE-CHANGE GRAIN-SIZE ASIAN MONSOON CORE SG-1 CHINA LAKE CIRCULATION SEDIMENTS MARGIN
英文关键词	Qaidam Basin; astronomical tuning; Plio-Pleistocene; XRF core scanning
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000571990500006
来源期刊	NEWSLETTERS ON STRATIGRAPHY
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/260009
推荐引用方式 GB/T 7714	Kaboth-Bahr, Stefanie,Koutsodendris, Andreas,Lu, Yin,et al. A late Pliocene to early Pleistocene (3.3-2.1 Ma) orbital chronology for the Qaidam Basin paleolake (NE Tibetan Plateau) based on the SG-1b drillcore record[J]. 中国科学院青藏高原研究所,2020,53(4).
APA	Kaboth-Bahr, Stefanie.,Koutsodendris, Andreas.,Lu, Yin.,Nakajima, Kai.,Zeeden, Christian.,...&Pross, Joerg.(2020).A late Pliocene to early Pleistocene (3.3-2.1 Ma) orbital chronology for the Qaidam Basin paleolake (NE Tibetan Plateau) based on the SG-1b drillcore record.NEWSLETTERS ON STRATIGRAPHY,53(4).
MLA	Kaboth-Bahr, Stefanie,et al."A late Pliocene to early Pleistocene (3.3-2.1 Ma) orbital chronology for the Qaidam Basin paleolake (NE Tibetan Plateau) based on the SG-1b drillcore record".NEWSLETTERS ON STRATIGRAPHY 53.4(2020).