Early Paleozoic ridge subduction in the Chinese Altai: Insight from the abrupt change in zircon Hf isotopic compositions |
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| Authors: | Min Sun XiaoPing Long KeDa Cai YingDe Jiang BuYun Wang Chao Yuan GuoChun Zhao WenJiao Xiao FuYuan Wu |
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| Affiliation: | SUN Min1,LONG XiaoPing1,2,CAI KeDa1,JIANG YingDe1,WANG BuYun1,YUAN Chao2,ZHAO GuoChun1,XIAO WenJiao3 & WU FuYuan3 1 Department of Earth Sciences,The University of Hong Kong,Pokfulam Road,Hong Kong,China,2 Key Laboratory of Isotope Geochronology , Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,3 State Key Laboratory of Lithospheric Evolution,Institute of Geology , Geophysics,Beijing 100029 |
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| Abstract: | Zircons were separated from granitoids, gneisses, and sedimentary rocks of the Chinese Altai. Those with igneous characteristics yielded U-Pb ages of 280-2800 Ma, recording a long history of magmatic activity in the region. Zircon Hf isotopic compositions show an abrupt change at ~420 Ma, indicating that prior to that time the magmas came from both ancient and juvenile sources, whereas younger magmas were derived mainly from juvenile material. This may imply that the lithosphere was signifi- cantly modified... |
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| Keywords: | Paleozoic ridge subduction Hf isotope granite Altai |
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