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