文象花岗岩的成分、结构和成因机制

徐海军; 张超; 武云; 陶明

doi:10.3799/dqkx.2016.115

Volume 41 Issue 9

Sep. 2016

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Xu Haijun, Zhang Chao, Wu Yun, Tao Ming, 2016. Compositions, Texture and Formation Mechanism of Graphic Granites. Earth Science, 41(9): 1511-1525. doi: 10.3799/dqkx.2016.115

Citation:

Xu Haijun, Zhang Chao, Wu Yun, Tao Ming, 2016. Compositions, Texture and Formation Mechanism of Graphic Granites. Earth Science, 41(9): 1511-1525. doi: 10.3799/dqkx.2016.115

Xu Haijun, Zhang Chao, Wu Yun, Tao Ming, 2016. Compositions, Texture and Formation Mechanism of Graphic Granites. Earth Science, 41(9): 1511-1525. doi: 10.3799/dqkx.2016.115

Citation:

Xu Haijun, Zhang Chao, Wu Yun, Tao Ming, 2016. Compositions, Texture and Formation Mechanism of Graphic Granites. Earth Science, 41(9): 1511-1525. doi: 10.3799/dqkx.2016.115

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Compositions, Texture and Formation Mechanism of Graphic Granites

doi: 10.3799/dqkx.2016.115

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
College of Computer Science, China University of Geosciences, Wuhan 430074, China

Received Date: 2015-11-21
Publish Date: 2016-09-15

Abstract

Abstract

Graphic granite, found predominantly in granitic pegmatite, is a leucocratic granitic rock consisting of an intimate intergrowth of alkali feldspar and quartz with a distinctive texture as ancient cuneiform writing when viewed in certain cross sections. Deciphering the graphic texture is important for understanding its origin and the crystallization process of granitic rocks. In this paper, we present investigations on petrology, mineral compositions, crystallographic relationship and topotaxy of quartz and alkali feldspar in graphic granites from the Fangshan pluton, North China and Huilanshan, Central China. The results indicate follows (1) The volume content of quartz usually ranges from 20% to 45%, and the composition of feldspar in graphic granites depends greatly on the formation conditions. However, the quartz-feldspar ratio and the composition of feldspar in graphic granites are relatively stable in coeval graphic granites in the same area. (2) The euhedral to subhedral coarse-grained feldspar host in graphic granites can be alkali feldspar or plagioclase. Microscopically, the feldspar host is usually a perthite, which is decomposed into irregular intergrowth of sodic and potassic feldspar. (3) The majority of the quartz grains undergrown with host feldspar are in the form of sub-parallel tabular, long rods and unconnected dendritic crystals, which only show a distinctive graphic texture in certain cross sections. (4) Under cross polarized light microscopy, multiple domains of quartz grains exhibit a nearly simultaneous extinction within a single crystal of feldspar. (5) Dauphiné twin of quartz, occasionally accompanied by Japan twin, is commonly developed in graphic granites. (6) Intergrowth of sodic and potassic feldspar, resulted from sub-solidus exsolution of precursor host feldspar solid solution, has almost the same orientations of (100), (010) and (001) planes and [001] axis. (7) A definite crystallographic orientation relationship between the majority of quartz grains and the feldspar host is identified in that[1123]_Quartz//[001]_Feldspar. These results suggest that the nucleation and growth of quartz are controlled by the host feldspar, which supports the simultaneous growth model of quartz and feldspar in graphic granites.
- graphic granite,
- graphic texture,
- electron backscatter diffraction,
- Dauphiné twin,
- topotaxy,
- crystallographic optics,
- mineralogy

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References(47)

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