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DOI	10.1016/j.gr.2022.01.008
	Carbon, oxygen and strontium isotopic and elemental characteristics of the Cambrian Longwangmiao Formation in South China: Paleoenvironmental significance and implications for carbon isotope excursions
	Zhang, Pengyuan; Wang, Yongli; Zhang, Xiaojun; Wei, Zhifu; Wang, Gen; Zhang, Ting; Ma, He; Wei, Jingyi; He, Wei; Ma, Xueyun; Zhu, Chenxi
通讯作者	Wang, YL (通讯作者)，Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing, Peoples R China.
发表日期	2022
ISSN	1342-937X
EISSN	1878-0571
起始页码	174
结束页码	190
卷号	106
英文摘要	The biosphere experienced episodic perturbations during the Neoproterozoic-early Cambrian, accompanied by major fluctuations of the carbon cycle. However, compared to the Ediacaran-early Cambrian, geochemical records of the Cambrian Toyonian Stage (Longwangmiao), which contains the significant Redlichiid-Olenellid Extinction Carbon Isotope Excursion (ROECE), are scarce. To address this data gap, we conducted measurements of carbon, oxygen and strontium isotopes and element contents of a continuous series of carbonate samples from the Longwangmiao Formation of Well HS2, located in the central Sichuan Basin of South China. Our specific aims were to reconstruct the paleoenvironment and to determine the origin of the ROECE. Strict sample screening was used to ensure that the isotopes and elements were not affected by diagenesis. The Sr-87/Sr-86 values of Well HS2, and for sites elsewhere, show that sea level gradually decreased during the Cambrian Toyonian Stage. Additionally, the pronounced negative delta C-13 excursion in the late Toyonian is globally associated with the ROECE, which is widely thought to have resulted from extinctions caused by a transgression. However, a transgression is not shown in the Sr-87/Sr-86 profile of Well HS2, which we attribute to local karst formation and erosion caused by frequent regional regressions. The interrelationships among several paleoenvironmental proxies show that continental weathering was climatically controlled, which affected the supply of terrigenous detritus, and that the carbonate platform was semi-restricted. Furthermore, profiles of paleoenvironmental proxies indicate that the environment was warm and humid, favoring high biological productivity and diversity during Interval I (early Toyonian), and that it gradually became colder and drier during Interval II (middle Toyonian). We suggest that by the time of Interval III (late Toyonian), the adverse effects of a cold and arid environment were superimposed on the transgression, triggering the ROECE. Our results provide a reference and possible interpretation for other carbon isotope excursion events. (C) 2022 Published by Elsevier B.V. on behalf of International Association for Gondwana Research.
关键词	FORMATION STAGE 4 YANGTZE PLATFORM SR-ISOTOPE OCEAN CHEMISTRY RADIOGENIC SR C-ISOTOPE BOUNDARY EVOLUTION EDIACARAN TRANSITION
英文关键词	Isotope geochemistry; Paleoenvironment; Redlichiid-Olenellid Extinction Carbon; Isotope Excursion; Cambrian Toyonian; South China
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000752737500004
来源期刊	GONDWANA RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255077
作者单位	[Zhang, Pengyuan; Wang, Yongli; Ma, He; Wei, Jingyi] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing, Peoples R China; [Zhang, Pengyuan; Wang, Yongli; Wei, Zhifu; Wang, Gen; Zhang, Ting; Wei, Jingyi; He, Wei; Ma, Xueyun] Univ Chinese Acad Sci, Beijing, Peoples R China; [Wang, Yongli] Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Beijing, Peoples R China; [Zhang, Xiaojun] Res Inst Petr Explorat & Dev, Northwest Branch, Lanzhou, Peoples R China; [Wei, Zhifu; Wang, Gen; Zhang, Ting; Ma, He; He, Wei; Ma, Xueyun] Chinese Acad Sci, Gansu Prov Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou, Peoples R China; [Zhu, Chenxi] China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Pengyuan,Wang, Yongli,Zhang, Xiaojun,et al. Carbon, oxygen and strontium isotopic and elemental characteristics of the Cambrian Longwangmiao Formation in South China: Paleoenvironmental significance and implications for carbon isotope excursions[J]. 中国科学院西北生态环境资源研究院,2022,106.
APA	Zhang, Pengyuan.,Wang, Yongli.,Zhang, Xiaojun.,Wei, Zhifu.,Wang, Gen.,...&Zhu, Chenxi.(2022).Carbon, oxygen and strontium isotopic and elemental characteristics of the Cambrian Longwangmiao Formation in South China: Paleoenvironmental significance and implications for carbon isotope excursions.GONDWANA RESEARCH,106.
MLA	Zhang, Pengyuan,et al."Carbon, oxygen and strontium isotopic and elemental characteristics of the Cambrian Longwangmiao Formation in South China: Paleoenvironmental significance and implications for carbon isotope excursions".GONDWANA RESEARCH 106(2022).