气候变化领域集成服务门户(CCPortal): Re-Os geochronology and coupled Os-Sr isotope constraints on the Sturtian snowball Earth

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DOI	10.1073/pnas.1317266110
	Re-Os geochronology and coupled Os-Sr isotope constraints on the Sturtian snowball Earth
	Rooney A.D.; Macdonald F.A.; Strauss J.V.; Dudás F.Ö.; Hallmann C.; Selby D.
发表日期	2014
ISSN	0027-8424
起始页码	51
结束页码	56
卷号	111 期号:1
英文摘要	After nearly a billion years with no evidence for glaciation, ice advanced to equatorial latitudes at least twice between 717 and 635 Mya. Although the initiation mechanism of these Neoproterozoic Snowball Earth events has remained a mystery, the broad synchronicity of rifting of the supercontinent Rodinia, the emplacement of large igneous provinces at low latitude, and the onset of the Sturtian glaciation has suggested a tectonic forcing. We present unique Re-Os geochronology and high-resolution Os and Sr isotope profiles bracketing Sturtian-age glacial deposits of the Rapitan Group in northwest Canada. Coupled with existing U-Pb dates, the postglacial Re-Os date of 662.4 ± 3.9 Mya represents direct geochronological constraints for both the onset and demise of a Cryogenian glaciation from the same continental margin and suggests a 55-My duration of the Sturtian glacial epoch. The Os and Sr isotope data allow us to assess the relative weathering input of old radiogenic crust and more juvenile, mantle-derived substrate. The preglacial isotopic signals are consistent with an enhanced contribution of juvenile material to the oceans and glacial initiation through enhanced global weatherability. In contrast, postglacial strata feature radiogenic Os and Sr isotope compositions indicative of extensive glacial scouring of the continents and intense silicate weathering in a post-Snowball Earth hothouse.
英文关键词	Neoproterozoic glaciation; Osmium isotopes; Rhenium-osmium geochronology; Strontium isotopes; Windermere Supergroup
语种	英语
scopus关键词	osmium; strontium; article; Canada; chronology; geochronology; glaciation; glacier; priority journal; Sturtian; weathering
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159112
作者单位	Rooney, A.D., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States; Macdonald, F.A., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States; Strauss, J.V., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States; Dudás, F.Ö., Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Hallmann, C., Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States, Max-Planck-Institute for Biogeochemistry, 07745 Jena, Germany, Center for Marine Environmental Sciences (MARUM), University of Bremen, 28359 Bremen, Germany; Selby, D., Department of Earth Sciences, Durham University, Durham DH1 3LE, United Kingdom
推荐引用方式 GB/T 7714	Rooney A.D.,Macdonald F.A.,Strauss J.V.,et al. Re-Os geochronology and coupled Os-Sr isotope constraints on the Sturtian snowball Earth[J],2014,111(1).
APA	Rooney A.D.,Macdonald F.A.,Strauss J.V.,Dudás F.Ö.,Hallmann C.,&Selby D..(2014).Re-Os geochronology and coupled Os-Sr isotope constraints on the Sturtian snowball Earth.Proceedings of the National Academy of Sciences of the United States of America,111(1).
MLA	Rooney A.D.,et al."Re-Os geochronology and coupled Os-Sr isotope constraints on the Sturtian snowball Earth".Proceedings of the National Academy of Sciences of the United States of America 111.1(2014).