| Microgranitoid Enclaves in Some I—and S—type Granites from Southern China |
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| 引用本文： | 周金城,陶仙聪,等.Microgranitoid Enclaves in Some I—and S—type Granites from Southern China[J].中国地球化学学报,1994,13(1):24-38. |
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| 作者姓名： | 周金城 陶仙聪 |
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| 作者单位： | [1]DepartmentofEarthSciences,NanjingUniversity,Nanjing210008 [2]ModernAnalyticalCentre,NanjingUniversity,Na |
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| 摘 要： | The three I-type plutons of Guantian(GT),Guidong(GD),Shangbao(SB)and the two S-type plutons of Xucun(XC)and Xiuning(XN) as well as their microgranitoid enclaves in southern China have been studied,Restite in the Motianling(MT) metasomatic granite in this area is described in this paper as well,Microgranitoid enclaves in the I-type granitoids may be divied into autoliths and schlierens which have marked differences both in petrography and geochemistry.In the S-type granitoids,schlierens are the major microgranitoid enclaves,but autoliths are rare.The metasomatic granite contains only restite without other enclaves.The microgranitoid enclaves and their host rocks have close ∈Nd(T)values and the same minerals within them are similar in composition.The microgranitoid enclaves,in general,don‘t represent the products of mixing of the syn-plutonic foreign mafic magma and the host acidic magma.They are the records of the evolution of intermediate-acidic magma itself.The formation of autoliths is related to the interdiffusion of different constituents in magma.Schlierens are the products of immiscible fractionation of the magma.
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| 关 键 词： | I型花岗岩 S型花岗岩 同源包体 纹影法 华南地区 |
Microgranitoid enclaves in some I- and S-type granites from southern China |
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| Jincheng Zhou,Xisheng Xu,Tao Xiancong.Microgranitoid enclaves in some I- and S-type granites from southern China[J].Chinese Journal of Geochemistry,1994,13(1):24-38. |
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| Authors: | Jincheng Zhou Xisheng Xu Tao Xiancong |
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| Institution: | (1) Department of Earth Sciences, Nanjing University, 210008 Nanjing;(2) Modern Analytical Centre, Nanjing University, 210008 Nanjing |
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| Abstract: | The three I-type plutons of Guantian (GT), Guidong (GD), Shangbao (SB) and the two S-type plutons of Xucun (XC) and Xiuning
(XN) as well as their microgranitoid enclaves in southern China have been studied. Restite in the Motianling (MT) metasomatic
granite in this area is described in this paper as well. Microgranitoid enclaves in the I-type granitoids may be divided into
autoliths and schlierens which have marked differences both in petrography and geochemistry. In the S-type granitoids, schlierens
are the major microgranitoid enclaves, but autoliths are rare. The metasomatic granite contains only restite without other
enclaves. The microgranitoid enclaves and their host rocks have close εNd (T) values and the same minerals within them are similar in composition. The microgranitoid enclaves, in general, don’t represent
the products of mixing of the syn-plutonic foreign mafic magma and the host acidic magma. They are the records of the evolution
of intermediate-acidic magma itself. The formation of autoliths is related to the interdiffusion of different constituents
in magma. Schlierens are the products of immiscible fractionation of the magma.
This project was financially supported by the National Natural Science Foundation of China. |
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| Keywords: | microgranitoid enclave granite autolith schlieren southern China |
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