期刊
GEOSCIENCE FRONTIERS
卷 3, 期 5, 页码 635-646出版社
CHINA UNIV GEOSCIENCES, BEIJING
DOI: 10.1016/j.gsf.2011.11.011
关键词
Garnet; A-type granite; Early Cretaceous; East Qinling Orogen
资金
- Key International S & T Cooperation Project of the Ministry of Science and Technology [2007DFA21230]
- Natural Science Foundation of China [40521001, 40334037, 40903017]
- Nature Science Foundation of Hubei Province [2009CDA004]
- Ministry of Education of China
- State Administration of Foreign Expert Affairs of China [B07039]
The Erlangmiao granite intrusion is located in the eastern part of the East Qinling Orogen. The granite contains almost 99 vol.% felsic minerals with accessory garnet, muscovite, biotite, zircon, and Fe-Ti oxide. Garnet is the dominant accessory mineral, shows zoned texture, and is rich in w(FeO) (14.13%-16.09%) and w(MnO) (24.21%-27.44%). The rocks have high SiO2, alkalis, FeOt/MgO, TiO2/MgO and low Al2O3, CaO with w(Na2O)/w(K2O)> 1. Their Rb, Ga, Ta, Nb, Y, and Yb contents are high and Sr, Ba, Eu, Zr, P, and Ti contents are low. These features indicate that the Erlangmiao granite is a highly evolved metaluminous A-type. Garnet crystallized at the expense of biotite from the MnO-rich evolved melt after fractionation of biotite, plagioclase, K-feldspar, zircon, apatite, and ilmenite. The relatively high initial Sr-87/Sr-86 ratios (0.706-0.708), low and negative epsilon(Nd) (120 Ma) values (-6.6 to 9.0), and old Nd model ages (1.5-1.7 Ga) suggest that the rocks were probably formed by partial melting of the Paleoproterozoic granitic gneisses from the basement, with participation of depleted mantle in an extensional setting. (C) 2011, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.
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