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U-Pb and Re-Os geochronology tracks stratigraphic condensation in the Sturtian snowball Earth aftermath
Rooney, Alan D.1; Yang, Chuan2; Condon, Daniel J.2; Zhu, Maoyan3,4,5; Macdonald, Francis A.6
2020-06-01
Source PublicationGEOLOGY
ISSN0091-7613
Volume48Issue:6Pages:625-629
Abstract

The snowball Earth hypothesis predicts a strong hysteresis resulting in discrete multimillion-year glaciations followed by globally synchronous deglaciation. Here we present new U-Ph zircon and Re-Os sedimentary rock geochronology and Os isotope chemostratigraphy from post-Sturtian sequences in south China to test the synchroneity of deglaciation. Highprecision chemical abrasion-isotope dilution-thermal ionization mass spectrometry (CA-ID-TIMS) U-Pb zircon dates refine the minimum age of deglaciation to 660.98 +/- 0.74 Ma, which is similar to 2 m.y. older than previously reported. We also provide a new maximum age constraint on the onset of the Marinoan glaciation of 657.17 +/- 0.78 Ma. A global compilation of new Os isotope chemostratigraphy reveals a large and systematic trend to unradiogenic values over <1 m of stratigraphy. Together, these data indicate that the Mn-carbonates in south China are not cap carbonates that formed as a response to post-snowball alkalinity, but are authigenic carbonates that formed millions of years after deglaciation. Sturtian cap carbonates tend to be absent or more condensed than their younger Marinoan counterparts. We suggest that this reflects a combination of enhanced accommodation space in early Cryogenian underlined rift basins, stronger hysteresis, larger ice volume, and/or higher CO2 levels needed for deglaciation of the longer Sturtian glaciation. Further, our findings indicate that the apparent diachroneity of deglaciation can be explained readily as a consequence of stratigraphic condensation, itself due to the large post-Sturtian glacioeustatic transgressive sequence that outpaced shallow-water carbonate deposition.

DOI10.1130/G47246.1
Indexed BySCI
Language英语
WOS KeywordCAP CARBONATE ; GLACIATION ; CONSTRAINTS ; AGE ; AUSTRALIA ; OSMIUM
Funding ProjectU.S. National Science Foundation[EAR-1759200] ; U.K. Natural Environment Research Council[NEE6066N/01] ; National Natural Science Foundation of China through the Biosphere Evolution, Transitions and Resilience program[41661134048] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000]
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000539742900019
Funding OrganizationU.S. National Science Foundation ; U.K. Natural Environment Research Council ; National Natural Science Foundation of China through the Biosphere Evolution, Transitions and Resilience program ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences
PublisherGEOLOGICAL SOC AMER, INC
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/32003
Collection中国科学院南京地质古生物研究所
Corresponding AuthorRooney, Alan D.
Affiliation1.Yale Univ, Dept Geol & Geophys, New Haven, CT 06511 USA
2.British Geol Survey, NERC Geochronol & Tracers Facil, Keyworth NG12 5GG, Notts, England
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China
5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
6.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA
Recommended Citation
GB/T 7714
Rooney, Alan D.,Yang, Chuan,Condon, Daniel J.,et al. U-Pb and Re-Os geochronology tracks stratigraphic condensation in the Sturtian snowball Earth aftermath[J]. GEOLOGY,2020,48(6):625-629.
APA Rooney, Alan D.,Yang, Chuan,Condon, Daniel J.,Zhu, Maoyan,&Macdonald, Francis A..(2020).U-Pb and Re-Os geochronology tracks stratigraphic condensation in the Sturtian snowball Earth aftermath.GEOLOGY,48(6),625-629.
MLA Rooney, Alan D.,et al."U-Pb and Re-Os geochronology tracks stratigraphic condensation in the Sturtian snowball Earth aftermath".GEOLOGY 48.6(2020):625-629.
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