Stratigraphic and tectonic implications of a newly discovered glacial diamictite-cap carbonate couplet in southwestern Mongolia

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Stratigraphic and tectonic implications of a newly discovered glacial diamictite-cap carbonate couplet in southwestern Mongolia

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dc.contributor.author Jones, David S.
dc.contributor.author Macdonald, Francis A.
dc.contributor.author Schrag, Daniel
dc.date.accessioned 2009-03-02T02:29:22Z
dc.date.issued 2009
dc.identifier.citation Macdonald, Francis A., David S. Jones, DS, and Daniel P. Schrag. 2009. Stratigraphic and tectonic implications of a newly discovered glacial diamictite-cap carbonate couplet in southwestern Mongolia. Geology 37: 123-126. en
dc.identifier.issn 0091-7613 en
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:2640593
dc.description.abstract We report here the discovery of a new end-Cryogenian glacial diamictite and an overlying basal Ediacaran cap carbonate within the Tsagaan Oloom Formation of southwestern Mongolia. The identifi cation of the Cryogenian-Ediacaran boundary, coupled with new 13C chemostratigraphic profi les, facilitates the integration of the Neoproterozoic stratigraphy of Mongolia with records elsewhere. These correlations indicate that a previously unrecognized, –16‰ Cryogenian 13C anomaly is present in the newly defi ned Tayshir member (informal) of the Tsagaan Oloom Formation. Furthermore, chemostratigraphic and lithostratigraphic relationships suggest an ~35 m.y. depositional hiatus below the phosphorite-bearing Zunne Arts member (informal) of the upper Tsagaan Oloom Formation and that subsidence renewed in the latest Ediacaran–Early Cambrian. We propose that the lower ~1500 m of the Tsagaan Oloom Formation was deposited on a thermally subsiding passive margin after Rodiniaage rifting, whereas the Zunne Arts member and the overlying ~1600 m of Early Cambrian strata were deposited in a foredeep basin that formed as the southern margin of the Dzabkhan terrane was subducted beneath the Khantayshir-Dariv arc. en
dc.description.sponsorship Earth and Planetary Sciences en
dc.language.iso en_US en
dc.publisher Geological Society of America en
dc.relation.isversionof http://dx.doi.org/10.1130/G24797A.1 en
dc.relation.hasversion http://www.eps.harvard.edu/people/faculty/schrag/research.htm en
dash.license META_ONLY
dc.title Stratigraphic and tectonic implications of a newly discovered glacial diamictite-cap carbonate couplet in southwestern Mongolia en
dc.relation.journal Geology en
dash.depositing.author Schrag, Daniel
dash.embargo.until 10000-01-01

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