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Ediacaran Cordilleran-type mountain ice sheets and their erosion effec by Ya zhuo Niu, G R Shi et al

Glacial erosion has long been recognized as a significant factor contributing to continental denudation during the Ediacaran Period, consequently leading to geochemical perturbations and biotic evolution in marine environments. However, the role of Ediacaran glaciation in the oceanic geochemical perturbations remains controversial due to ambiguous geochronological correlations and unresolved paleogeographic and tectonic settings. A total of 45 Ediacaran glacial records have been reviewed and categorized into four Ediacaran glaciations: Gaskiers (581–579 Ma), Fauquier (ca. 571 Ma), Bou-Azzer (ca. 565–560 Ma), and Hankalchough (ca. 562–551 Ma) glaciations. Of these glacial records, 53% have been reported in the Avalonian–Cadomian and Altaids accretionary orogenic belts, recognized as representing Cordilleran-type mountain ice sheets (CMISs). This study reports an Ediacaran glaciation in the southern Altaids, NW China, with 18 glacial and non-glacial facies and 1173 new U-Pb-Hf da

Deformational History of the Kanguer Subduction Complex in the Eastern by Qigui Mao, Wenjiao Xiao et al

The Kanguer Subduction Complex in the Eastern Tianshan is critical to understanding the tectonic evolution of the southern Altaids as it marks the terminal suture along which the Paleo-Asian Ocean was consumed. However, the nature and timing of this final collision, as well as the mechanism of shearing and related magmatism, remain enigmatic. The Kanguer Subduction Complex demonstrates obvious sinistral transtensional and dextral compressional deformation in different tectonic events along the Qiugemingtash Shear Zone in Huangshan area. Three sets of asymmetric plunging folds (e.g., basin-like, S-shaped and Z(W)-shaped) were recognized in the sedimentary rocks. Locally, the folds are offset by dextral strike-slip faults, indicating that they were formed by dextral shearing. The Huangshandong mafic-ultramafic complex experienced brittle dextral shearing partitioned around the margins of the intrusion. Detrital zircon U-Pb dates for deformed sedimentary rocks have maximum deposit ages (M

New GSA Bulletin Articles Published Ahead of Print in March

New GSA Bulletin Articles Published Ahead of Print in March
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Paleogeographic evolution of a Carboniferous–Permian sea in the southe by Ya zhuo Niu, G R Shi et al

Paleogeographic evolution of a Carboniferous–Permian sea in the southe by Ya zhuo Niu, G R Shi et al
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New GSA Bulletin articles published ahead of print in June

New GSA Bulletin articles published ahead of print in June
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