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New GSA Bulletin articles published ahead of print in August

New GSA Bulletin articles published ahead of print in August
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UNCW Geologist Digs Into Earth s Oldest Rocks

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UNCW Geology Professor studying 3-billion-year-old rocks in Greenland

UNCW Geology Professor studying 3-billion-year-old rocks in Greenland
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New articles for Geosphere posted online in June

New articles for Geosphere posted online in June
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New GSA Bulletin articles published ahead of print in March

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

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