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Significance of allanite-(Ce) in granitic gneisses from the ultrahigh-pressure metamorphic terrane, Dabie Shan, central China

Published online by Cambridge University Press:  05 July 2018

Xiaochun Liu ,
Shuwen Dong ,
Huaimin Xue  and
Jianxiong Zhou
Xiaochun Liu
Affiliation:
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081
Shuwen Dong
Affiliation:
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081
Huaimin Xue
Affiliation:
Nanjing Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences, Nanjing 210016
Jianxiong Zhou
Affiliation:
Institute of Mineral Deposits, Chinese Academy of Geological Sciences, Beijing 100037, China
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Abstract

A recent study of granitic gneisses in the ultrahigh-pressure (UHP) metamorphic terrane from Dabie Shan, central China reveals that allanite-(Ce) is a widespread REE-bearing accessory phase. The microprobe analyses show that allanites-(Ce) have nearly uniform chemical compositions, with total REE contents ranging from 23 to 28 wt.% and a La/Ce ratio of 0.57–0.73. All allanites-(Ce) are replaced or rimmed by epidotes and commonly form a relatively REE-poor rim near the interfaces. The textural relations and mineral chemistry suggest that allanite-(Ce) crystallized prior to metamorphism and therefore was of igneous origin, whereas the surrounding epidote was the product of metamorphism. Granitic gneiss, composed chiefly of sodic plagioclase, microcline and quartz with minor amounts of Mn-rich garnet, biotite, low Si phengitic mica, epidote, chlorite and sometimes amphibole, was formed at 495°C and ∼5 kbar, corresponding to the retrograde metamorphism of UHP rocks. Accordingly, it is believed that granitic gneisses have not experienced UHP metamorphism. This implies that a large scale tectonic juxtaposition developed before the epidote-amphibolite facies retrograde metamorphism of UHP rocks during the late continental collision in Dabie Shan.

Keywords

allanite-(Ce)granitic gneissesUHP rockstectonic juxtapositionDahie Shan
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 4 , August 1999 , pp. 579 - 586
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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