an early cretaceous garnet-bearing metaluminous a-type granite intrusion in the east qinling orogen, central china: petrological, mineralogical and geochemical constraints

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ID: 199085
2012
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Abstract
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 87Sr/86Sr ratios (0.706–0.708), low and negative εNd (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.
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zhang2012geosciencean Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Jinyang Zhang;Changqian Ma;Zhenbing She
Journal neuroscience research
Year 2012
DOI
10.1016/j.gsf.2011.11.011
URL
http://www.sciencedirect.com/science/article/pii/S1674987111001150
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