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Jian Xu; Xiao-Ping Xia; Qiang Wang; Christopher J. Spencer; Bin He . Abstract: The mechanisms and processes by which subducted slab interacted with mantle plume remain controversial, as direct observation of such interaction is difficult to impossible. Compositional heterogeneity of large igneous provinces (LIPs) additionally makes plume-slab interaction hard to detect. Oxygen isotopes are sensitive enough to trace the source of magmas. Here we provide evidence for plume-slab interaction mainly based on in situ zircon Hf-O isotope analyses, as well as whole-rock elemental and Sr-Nd-Hf isotope analyses, on the Late Permian and Early Triassic A-type granites on the margin of the Emeishan LIP in SW China. These granites show typical A-type ....
Boulder, Colo., USA: Several articles were published online ahead of print for GSA Bulletin in February. Topics include earthquake cycles in southern Cascadia, fault dynamics in the Gulf of Mexico, debris flow after wildfires, the assembly of Rodinia, and the case for no ring fracture in Mono basin. Jurassic evolution of the Qaidam Basin in western China: Constrained by stratigraphic succession, detrital zircon U-Pb geochronology and Hf isotope analysis Tao Qian; Zongxiu Wang; Yu Wang; Shaofeng Liu; Wanli Gao . Abstract: The formation and evolution of an intracontinental basin triggered via the subduction or collision of plates at continental margins can record ....