气候变化领域集成服务门户(CCPortal): Paleoenvironmental implications of molecular and carbon isotopic distributions of n-alkanes in the hominoid-bearing upper Miocene sediments from the Zhaotong Basin; southwestern China

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DOI	10.1016/j.palaeo.2020.109627
	Paleoenvironmental implications of molecular and carbon isotopic distributions of n-alkanes in the hominoid-bearing upper Miocene sediments from the Zhaotong Basin; southwestern China
	Zheng L.; Huang X.; Ji X.; Deng C.
发表日期	2020
ISSN	0031-0182
卷号	544
英文摘要	It is crucial to understand the relationship between hominoid primates and their living environment. Located at the southeastern margin of the Tibetan Plateau, the Shuitangba (STB) outcrop from the Zhaotong Basin is famous for bearing the remains of the youngest known ape fossil in the terminal Miocene (~6.2 Ma). In this study, the molecular and carbon isotope compositions of n-alkanes, together with the loss on ignition and the bulk carbon isotope composition of total organic matter, were investigated in the STB outcrop to infer the paleoenvironmental conditions in this uppermost Miocene sedimentary sequence, with the emphasis on the habitat of the STB hominoid. In the hominoid-bearing peaty clay layer and the surrounding lignite layers, the n-alkane molecular and carbon isotope compositions support a primary contribution from terrestrial higher plants. In contrast, n-alkanes in the upper shallow lake sediments are derived from multiple origins, mainly from aquatic plants and bacteria. Both carbon preference index (CPI) and average chain length (ACL) vary closely with the lithology, but the CPI record shows the larger amplitude of change than the ACL and varies sharply during the lithological boundary. It is notable that the changes of the molecular and carbon isotope compositions of long-chain n-alkanes do not parallel with the abrupt increase of Poaceae pollen percentage during the STB hominoid appearing stage. Such an inconsistency between herb pollen percentage and n-alkane ratios may result from the different sources. Our results clearly support that these organic matter-based ratios have the potential to record the paleoenvironmental changes in ancient lacustrine sediments. © 2020 Elsevier B.V.
英文关键词	Compound-specific carbon isotope; Habitat; Late Neogene; Leaf wax; Lignite
语种	英语
scopus关键词	alkane; carbon isotope; fossil; fossil record; herb; hominid; lacustrine deposit; lignite; Miocene; molecular analysis; Neogene; organic matter; outcrop; paleoenvironment; pollen; sediment chemistry; wax; China; Qinghai-Xizang Plateau; Yunnan; Zhaotong; Embryophyta; Hominoidea; Poaceae; Primates
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150579
作者单位	School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; Hubei Key Laboratory of Critical Zone Evolution, School of Geography and Information Engineering, China University of Geosciences, Wuhan, 430078, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430078, China; Department of Paleoanthropology, Yunnan Institute of Cultural Relics and Archeology, Kunming, 650118, China; Joint Research Center for Human Evolution and Environmental Changes of Yunnan, Zhaotong, 657000, China; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Zheng L.,Huang X.,Ji X.,et al. Paleoenvironmental implications of molecular and carbon isotopic distributions of n-alkanes in the hominoid-bearing upper Miocene sediments from the Zhaotong Basin; southwestern China[J],2020,544.
APA	Zheng L.,Huang X.,Ji X.,&Deng C..(2020).Paleoenvironmental implications of molecular and carbon isotopic distributions of n-alkanes in the hominoid-bearing upper Miocene sediments from the Zhaotong Basin; southwestern China.Palaeogeography, Palaeoclimatology, Palaeoecology,544.
MLA	Zheng L.,et al."Paleoenvironmental implications of molecular and carbon isotopic distributions of n-alkanes in the hominoid-bearing upper Miocene sediments from the Zhaotong Basin; southwestern China".Palaeogeography, Palaeoclimatology, Palaeoecology 544(2020).