气候变化领域集成服务门户(CCPortal): Marine carbon and sulfur cycling across the Ediacaran-Cambrian boundary in Tarim Block and its implications for paleoenvironmental changes

CCPortal

DOI	10.1016/j.palaeo.2020.110011
	Marine carbon and sulfur cycling across the Ediacaran-Cambrian boundary in Tarim Block and its implications for paleoenvironmental changes
	Zhang T.; Li Y.; Fan T.; Lash G.; Gao Z.; Fan Q.
发表日期	2020
ISSN	0031-0182
卷号	560
英文摘要	The Ediacaran-Cambrian transition was a critical period of Earth history because of the coincidence among climate change, bioevolution, and tectonic activity. The nature of carbon and sulfur-cycling processes spanning the Ediacaran-Cambrian boundary remains debatable. This study considers high-resolution stable isotope chemostratigraphy of the Sugetbrak and Yutixi sections of the Keping area of the Tarim Basin, northwestern China. The sections display a pronounced negative δ13Ccarb shift (the Basal Cambrian Carbon Isotope Excursion) that spans the Ediacaran-Cambrian boundary. Deposits overlying the negative excursion are characterized by heavier δ13Ccarb values ranging from −7.8‰ to +4.1‰. The biostratigraphically calibrated δ13Ccarb profiles likely reflect widespread perturbation of the global oceanic carbon cycle and associated mass extinction and subsequent biological evolution. The δ34Spy profiles of the studied sections display a wide distribution of values, ranging from −16.4‰ to 23.8‰. The variable δ34Spy signatures of these sections are partially controlled by microbial sulfate reduction rates, which are sensitive to local sulfate concentration, availability of organic matter and the marine redox state. The strong coupling between enhanced organic carbon and pyrite burial, the appearance of Cambrian-type animals and a shift to a more oxidizing marine environment might suggest a temporal causality of higher oxygen levels of the atmosphere-ocean realm with bio-events during the Ediacaran–Cambrian transition. The development of ecosystems across the Ediacaran–Cambrian transition may have significantly impacted the oceanic carbon and sulfur biogeochemical processes in Earth's history and, in turn, affecting themselves. © 2020 Elsevier B.V.
英文关键词	Black shale; Keping-Aksu area; Northwest China; Stable isotope; Yurtus Formation
语种	英语
scopus关键词	burial (geology); Cambrian; chemostratigraphy; Ediacaran; isotopic composition; landscape evolution; marine environment; mass extinction; pyrite; sulfur cycle; China; Tarim Basin; Tarim Block; Xinjiang Uygur; Animalia
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/150286
作者单位	School of Energy Resources, China University of Geosciences (Beijing), Beijing, 100083, China; Key Laboratory of Strategy Evaluation for Shale Gas, Ministry of Land and Resources, China University of Geosciences (Beijing), Beijing, 100083, China; Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, China University of Geosciences, Beijing, 100083, China; Department of Geology and Environmental Sciences, State University of New York – Fredonia, Fredonia, NY 14063, United States
推荐引用方式 GB/T 7714	Zhang T.,Li Y.,Fan T.,et al. Marine carbon and sulfur cycling across the Ediacaran-Cambrian boundary in Tarim Block and its implications for paleoenvironmental changes[J],2020,560.
APA	Zhang T.,Li Y.,Fan T.,Lash G.,Gao Z.,&Fan Q..(2020).Marine carbon and sulfur cycling across the Ediacaran-Cambrian boundary in Tarim Block and its implications for paleoenvironmental changes.Palaeogeography, Palaeoclimatology, Palaeoecology,560.
MLA	Zhang T.,et al."Marine carbon and sulfur cycling across the Ediacaran-Cambrian boundary in Tarim Block and its implications for paleoenvironmental changes".Palaeogeography, Palaeoclimatology, Palaeoecology 560(2020).