Early Paleozoic ridge subduction in the Chinese Altai: Insight from the abrupt change in zircon Hf isotopic compositions
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- 作者：Min Sun (1)
XiaoPing Long (1) (2)
KeDa Cai (1)
YingDe Jiang (1)
BuYun Wang (1)
Chao Yuan (2)
GuoChun Zhao (1)
WenJiao Xiao (3)
FuYuan Wu (3) - 关键词：Paleozoic ; ridge subduction ; Hf isotope ; granite ; Altai
- 刊名：Science China Earth Sciences
- 出版年：2009
- 出版时间：September 2009
- 年：2009
- 卷：52
- 期：9
- 页码：1345-1358
- 全文大小：1247KB
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XiaoPing Long (1) (2)
KeDa Cai (1)
YingDe Jiang (1)
BuYun Wang (1)
Chao Yuan (2)
GuoChun Zhao (1)
WenJiao Xiao (3)
FuYuan Wu (3)
1. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China
2. Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
3. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China - ISSN：1869-1897
文摘
Zircons were separated from granitoids, gneisses, and sedimentary rocks of the Chinese Altai. Those with igneous characteristics yielded U-Pb ages of 280-800 Ma, recording a long history of magmatic activity in the region. Zircon Hf isotopic compositions show an abrupt change at ?20 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 significantly modified in composition by a rapid addition of melt from the mantle. We suggest that this dramatic change was due to the onset of ridge subduction, which can account not only for the formation of voluminous granitoids, mafic rocks with complex compositions, and the association of adakite + high-Mg andesite + boninite + Nb-enriched basalt, but also for the coeval high-T, low-P metamorphism.