U-Pb and Re-Os geochronology tracks stratigraphic condensation in the Sturtian snowball Earth aftermath
文献类型:期刊论文
作者 | Rooney, Alan D.3; Yang, Chuan4; Condon, Daniel J.4; Zhu, Maoyan1,5,6; Macdonald, Francis A.2 |
刊名 | GEOLOGY |
出版日期 | 2020-06-01 |
卷号 | 48期号:6页码:625-629 |
ISSN号 | 0091-7613 |
DOI | 10.1130/G47246.1 |
英文摘要 | 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. |
WOS关键词 | CAP CARBONATE ; GLACIATION ; CONSTRAINTS ; AGE ; AUSTRALIA ; OSMIUM |
资助项目 | U.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研究方向 | Geology |
语种 | 英语 |
出版者 | GEOLOGICAL SOC AMER, INC |
WOS记录号 | WOS:000539742900019 |
资助机构 | U.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 |
源URL | [http://ir.nigpas.ac.cn/handle/332004/32002] |
专题 | 中国科学院南京地质古生物研究所 |
通讯作者 | Rooney, Alan D. |
作者单位 | 1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China 2.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA 3.Yale Univ, Dept Geol & Geophys, New Haven, CT 06511 USA 4.British Geol Survey, NERC Geochronol & Tracers Facil, Keyworth NG12 5GG, Notts, England 5.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 6.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China |
推荐引用方式 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. |
入库方式: OAI收割
来源:南京地质古生物研究所
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