NIGPAS OpenIR  > 中国科学院南京地质古生物研究所
Ediacaran seawater temperature: Evidence from inclusions of Sinian halite
Meng, Fanwei (孟凡巍)1,2; Ni, Pei1; Schiffbauer, James D.3; Yuan, Xunlai (袁训来)2; Zhou, Chuanming (周传明)2; Wang, Yigang4; Xia, Maolong4
2011
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume184Issue:1-4Pages:63-69
Abstract

Seawater temperatures throughout Earth's history have been suggested to illustrate a long-term cooling trend from nearly 70 degrees C at similar to 3500 Ma to around 20 degrees C at similar to 800 Ma. The terminal Neoproterozoic prior to the "Cambrian Explosion" is a key interval in evolutionary history, as complex multicellularity appeared with the advent of the Ediacara fauna. These organisms were likely the first that required higher levels of atmospheric and dissolved marine oxygen for their sustainability. It is known that most modern macroinvertebrates are intolerant of temperatures in excess of 45 degrees C. Perhaps more importantly, these high seawater temperatures limit the potential of dissolved oxygen, and therefore become an integral part of this evolutionary story. Previously, our understanding of seawater temperature during the terminal Neoproterozoic comes only from (18)O/(16)O and (30)Si/(28)Si ratios ascertained from a limited number of cherts. Isotopic ratio methods for assessing seawater temperatures are inherently indirect and have a wide range of oscillation. However, maximum homogenization temperatures (Th(max)) of primary fluid inclusions in halite provide a direct means of assessing brine temperature, and have been shown to correlate well with average maximum air temperatures. The oldest halites date to the Neoproterozoic-lower Paleozoic (similar to 700-500 Ma), and Ediacaran representatives can be found in Sichuan Province, China, which do preserve primary fluid inclusions for analysis via cooling nucleation methods. We utilized halite samples from the Changning-2 well, correlative to the Dengying Formation (551-542 Ma), to provide a direct assessment of terminal Neoproterozoic seawater temperature. Our measurements indicate that seawater temperatures where these halites formed are highly similar to tropical Phanerozoic seawater temperature estimates. From compiled paleotemperature data, the decline in seawater temperatures over the course of the Proterozoic, accompanied by the reduction of seawater salinity with the sequestration of salt in massive halite deposits in the Neoproterozoic, allowed the ocean system to accumulate more dissolved oxygen, and potentially paved the way for the evolutionary innovation of complex multicellularity. (C) 2010 Elsevier B.V. All rights reserved.

KeywordEdiacaran Seawater Temperature Inclusion Halite
DOI10.1016/j.precamres.2010.10.004
Language英语
WOS KeywordOxygen-isotope Geochemistry ; Early Animal Evolution ; Fluid Inclusions ; Salinity History ; Billion Years ; South-africa ; Cherts ; Ocean ; Basin ; Life
Funding ProjectChina Postdoctoral Science Foundation ; Jiangsu Province Postdoctoral Science Foundation ; State Key Laboratory of Palaeobiology and Stratigraphy NIGPAS[073108] ; Chinese Academy of Sciences[KZCX3-SW-141] ; Chinese Ministry of Science and Technology[2006CB806400] ; National Natural Science Foundation of China[40703018] ; National Found for Fostering Talents of Basic Sciences[J0630967]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000286541100004
Funding OrganizationChina Postdoctoral Science Foundation ; Jiangsu Province Postdoctoral Science Foundation ; State Key Laboratory of Palaeobiology and Stratigraphy NIGPAS ; Chinese Academy of Sciences ; Chinese Ministry of Science and Technology ; National Natural Science Foundation of China ; National Found for Fostering Talents of Basic Sciences
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/479
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorNi, Pei
Affiliation1.Nanjing Univ, State Key Lab Mineral Deposits Res, Inst Geofluid Res, Dept Earth Sci, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, Nanjing, Peoples R China
3.Virginia Polytech Inst & State Univ, Dept Geosci, Blacksburg, VA 24061 USA
4.PetroChina, SW Oil & Gas Field Co, Explorat & Dev Res Inst, Chengdu, Peoples R China
Recommended Citation
GB/T 7714
Meng, Fanwei ,Ni, Pei,Schiffbauer, James D.,et al. Ediacaran seawater temperature: Evidence from inclusions of Sinian halite[J]. PRECAMBRIAN RESEARCH,2011,184(1-4):63-69.
APA Meng, Fanwei .,Ni, Pei.,Schiffbauer, James D..,Yuan, Xunlai .,Zhou, Chuanming .,...&Xia, Maolong.(2011).Ediacaran seawater temperature: Evidence from inclusions of Sinian halite.PRECAMBRIAN RESEARCH,184(1-4),63-69.
MLA Meng, Fanwei ,et al."Ediacaran seawater temperature: Evidence from inclusions of Sinian halite".PRECAMBRIAN RESEARCH 184.1-4(2011):63-69.
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