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Controls on fossil pyritization: Redox conditions, sedimentary organic matter content, and Chuaria preservation in the Ediacaran Lantian Biota
Guan, C. (关成国); Wang, W. (王伟(女)); Zhou, C. (周传明); A.D.Muscente; Wan B. (万斌); Chen Xiang; Yuan, XL (袁训来); Chen Z (陈哲); ouyang q (欧阳晴)
2017
Source PublicationPalaeogeography, Palaeoclimatology, Palaeoecology
ISSN0031-0182
Volume474Pages:26-35
AbstractPyritization represents a major taphonomic pathway for exceptional preservation of soft tissues. Although various Ediacaran Lagerstatten contain pyritized fossils, the controls on this taphonomic pathway prior to the Precambrian-Phanerozoic transition have only recently received significant attention, and no studies have yet thoroughly investigated environmental conditions facilitating exceptional preservation via pyritization in the early Ediacaran. Here, we investigate the preservational environments of macroscopic fossil Chuaria in the early Ediacaran Lantian Formation of South China using petrographic, electron microscopic, and geochemical data. Chuaria occur as pervasively pyritized (spheroid-shaped) globose and non-pervasively pyritized (disk shaped) subglobose fossils in different stratigraphic intervals. Although these different stratigraphic intervals are similar in terms of total sulfur (TS, similar to 5%), subglobose Chuaria shales have greater total organic carbon (TOC, similar to 7.9%) contents than globose Chuaria shales (similar to 3.6%). Additionally, petrographic observations and TOC-TS cross-plots suggest that, whereas globose fossils were preserved under suboxic bottom waters, the subglobose fossils were preserved in euxinic bottom waters. Overall, these results affirm that pyritization in the Precambrian was generally favored in organic-poor, reactive iron-rich, sulfate-rich environments probably with slow sedimentation rates. When organics were scarce and reactive iron was abundant, bacterial sulfate reduction (BSR) created hydrogen sulfide and reactive iron concentration gradients around fossils, which kinetically and thermodynamically favored rapid and pervasive pyritization, as observed in globose Chuaria. Conversely, when organics were abundant and reactive iron/sulfate availabilities were limited by widespread BSR, fossils were relatively rapidly buried beneath the BSR metabolic zone of sediment, where they were principally preserved as aluminosilicified carbonaceous fossils that were compacted into subglobose forms. Thus, preservational variations among pyritized fossils in the Ediacaran may reflect differences in sedimentary organic matter content and/or bottom water redox chemistry. (C) 2016 Elsevier B.V. All rights reserved.
KeywordLantian Biota Chuaria Pyritization Taphonomy Black shale
DOI10.1016/j.palaeo.2016.05.013
Indexed BySCI
Language英语
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000399261500003
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/12890
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorZhou, C. (周传明)
Recommended Citation
GB/T 7714
Guan, C. ,Wang, W. ,Zhou, C. ,et al. Controls on fossil pyritization: Redox conditions, sedimentary organic matter content, and Chuaria preservation in the Ediacaran Lantian Biota[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017,474:26-35.
APA Guan, C. .,Wang, W. .,Zhou, C. .,A.D.Muscente.,Wan B. .,...&ouyang q .(2017).Controls on fossil pyritization: Redox conditions, sedimentary organic matter content, and Chuaria preservation in the Ediacaran Lantian Biota.Palaeogeography, Palaeoclimatology, Palaeoecology,474,26-35.
MLA Guan, C. ,et al."Controls on fossil pyritization: Redox conditions, sedimentary organic matter content, and Chuaria preservation in the Ediacaran Lantian Biota".Palaeogeography, Palaeoclimatology, Palaeoecology 474(2017):26-35.
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