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
Geosphere,
posts articles online regularly. Topics for articles posted for
Geosphere this month include a tale of five enclaves ; evidence
for mantle and Moho in the Baltimore Mafic Complex (Maryland, USA); and the
after effects of the 1964 Mw 9.2 megathrust rupture, Alaska.
From Ordovician nascent to early Permian mature arc in the southern
Altaids: Insights from the Kalatage inlier in the Eastern Tianshan, NW
China
Qigui Mao; Jingbin Wang; Wenjiao Xiao; Brian F. Windley; Karel Schulmann
.
Abstract:
The Kalatage inlier in the Dananhu-Haerlik arc is one of the most important
arcs in the Eastern Tianshan, southern Altaids (or Central Asian orogenic