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- W756491202 abstract "Depositional age of the Xieshuihe Formation in the Nanhua Basin, South China has been controversial in the past two decades, which hampers our understanding of the synchroneity of the 2nd episode of Sturtian glaciation as well as regional stratigraphic correlation. In this study, a new SIMS zircon U–Pb age of 691.9 ± 8.0 Ma (MSWD = 1.3) was obtained from a tuffaceous siltstone bed within the upper Xieshuihe Formation in the Nanhua Basin, which is within errors consistent with the ID-TIMS U–Pb zircon age of 688.6 + 9.5/−6.2 Ma from Yukon, Canada, the SHRIMP U–Pb zircon ages of 685 ± 7 and 684 ± 4 Ma from central Idaho, the SHRIMP U–Pb zircon age of 686 ± 4 Ma from southeastern Idaho, and the SHRIMP U–Pb age of 703 ± 6 Ma from northern Utah, North American Cordilleran margin. All these dated formations conformably underlie the upper Sturtian glaciogenic diamictite. Hence new ages suggest a maximum initiation age of ca. 690 Ma for the 2nd episode of Sturtian glaciation, which is synchronous in at least two geographically separated palaeocontinents. The commonly low δ18O values (3–5‰) from the zircon grains of Xieshuihe Formation suggest an influence of glaciation during their formation, probably by means of an ice–fire interaction process as previously proposed. Additionally, new age data suggest the Xieshuihe Formation is not correlative with the Liantuo Formation/Banxi Group as previously assumed. Rather, it could be correlated with the Liangjiahe Member, Fulu Formation in South China, which is feasible in terms of sedimentology and sequence stratigraphy." @default.
- W756491202 created "2016-06-24" @default.
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- W756491202 date "2015-09-01" @default.
- W756491202 modified "2023-10-16" @default.
- W756491202 title "Global synchronous initiation of the 2nd episode of Sturtian glaciation: SIMS zircon U–Pb and O isotope evidence from the Jiangkou Group, South China" @default.
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- W756491202 doi "https://doi.org/10.1016/j.precamres.2015.06.002" @default.
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