气候变化领域集成服务门户(CCPortal): Mercury anomalies within the lower Cambrian (stage 2–3) in South China: Links between volcanic events and paleoecology

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DOI	10.1016/j.palaeo.2020.109956
	Mercury anomalies within the lower Cambrian (stage 2–3) in South China: Links between volcanic events and paleoecology
	Wang Z.; Tan J.; Boyle R.; Wang W.; Kang X.; Dick J.; Lyu Q.
发表日期	2020
ISSN	0031-0182
卷号	558
英文摘要	The early Cambrian period is characterized by not only the explosive radiation of metazoans, but also several mass extinction events. Mercury (Hg) enrichment is now widely used as a proxy for volcanic input, with implications for the CO2 and temperature to which the biosphere was subject during these events. Here, we report the oldest mercury anomaly records from organic matter in the Phanerozoic, taken from two wells (Xa1 and Xb1), which represent early Cambrian slope to basin sections in South China. The first mercury anomaly coincided with both a negative carbon isotope excursion (Shiyantou Carbon isotope Excursion, SHICE) recorded in Cambrian Stage 2, and the disappearance of small shelly fossil assemblages (SSFs). The above events may have been closely related to an unknown large igneous province (LIP) in Earth's history. Two subsequent mercury anomalies occur in conjunction with phases of hydrothermal (submarine volcanic) events. In addition, we find evidence for photic zone euxinia (PZE) in some parts of the depositional environment, with iron-speciation data suggestive of dissolved H2S concentrations close to 10 mM in the basin environment, along with hyper-enrichment of V and Zn in shale suggesting the presence of dissolved H2S in the photic zone. We interpret our results as providing potential evidence for links between volcanism, widespread euxinia, and early Cambrian faunal changes. © 2020 Elsevier B.V.
英文关键词	Cambrian radiation; Extinction; Mercury enrichment; Niutitang shale; Photic zone euxinia; Small shelly fossils
语种	英语
scopus关键词	biostratigraphy; Cambrian; carbon isotope; explosive volcanism; extinction risk; fossil record; large igneous province; mercury (element); paleoecology; photic zone; volcanic ash; China; Metazoa
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/150348
作者单位	Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geosciences and Info-physics, Central South University, Changsha, 410083, China; Global Systems Institute, College of Life and Environment, University of Exeter, Exeter, Devon EX4 4QE, United Kingdom
推荐引用方式 GB/T 7714	Wang Z.,Tan J.,Boyle R.,等. Mercury anomalies within the lower Cambrian (stage 2–3) in South China: Links between volcanic events and paleoecology[J],2020,558.
APA	Wang Z..,Tan J..,Boyle R..,Wang W..,Kang X..,...&Lyu Q..(2020).Mercury anomalies within the lower Cambrian (stage 2–3) in South China: Links between volcanic events and paleoecology.Palaeogeography, Palaeoclimatology, Palaeoecology,558.
MLA	Wang Z.,et al."Mercury anomalies within the lower Cambrian (stage 2–3) in South China: Links between volcanic events and paleoecology".Palaeogeography, Palaeoclimatology, Palaeoecology 558(2020).