| 粤西黄岭岩组片麻状花岗质岩石的剪切深熔机理 |
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| 引用本文： | 杨坤光,彭少梅.粤西黄岭岩组片麻状花岗质岩石的剪切深熔机理[J].高校地质学报,1997,3(4):429-437. |
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| 作者姓名： | 杨坤光 彭少梅 |
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| 作者单位： | [1]中国地质大学 [2]广东省地质科学研究所 |
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| 基金项目： | 国家自然科学基金!49572100，广东省地矿局资助!“粤西高州岩群地质特征及金银多金属成矿关系”项目 |
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| 摘 要： | 粤西黄岭岩组片麻状花岗质岩石属于云开地块的基底岩系(2600Ma～1700Ma)。自下而上发育3种均造样式：下部透入性剪切变形带；中部平直均匀变形带；上部为揉皱带。应变分析表明，近水平分层剪切作用以及剪切应变带的向上迁移形成了上述不同构造样式，化学分析显示不同构造样式的花岗质岩石具有陆壳改造S型花岗岩特点。它们可能是形成于浅海一半深海的碎屑原岩在原地或准原地剪切深熔的结果。剪切深熔深度约13km～15km，峰期变形在2000Ma～1700Ma。
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| 关 键 词： | 花岗质岩石 化学分析 剪切深熔 片麻状岩石 |
| 收稿时间： | 1997-12-20 |
| 修稿时间： | 1997-12-20 |
SHEARING ANATECTIC MECHANISM OF GNEISSIC GRANITIC ROCKS IN THE HUANGLING FORMATION,WESTERN GUANGDONG |
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| Yang Kunguang,Peng Shaomei,Zheng Jianping,.SHEARING ANATECTIC MECHANISM OF GNEISSIC GRANITIC ROCKS IN THE HUANGLING FORMATION,WESTERN GUANGDONG[J].Geological Journal of China Universities,1997,3(4):429-437. |
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| Authors: | Yang Kunguang Peng Shaomei Zheng Jianping |
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| Institution: | 1. China University Geosciences, Wuhan 430074; 2. Instiute of Geological Sciences of Guangdong Province, GuangZhou 510080 |
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| Abstract: | Gneissic granitic rocks of the Huangling formation in western Guangdong are the basement metamorphic series (2600Ma -1700 Ma ). Three different structural styles are developed in these rocks:penetrating shear zone in the lower part,regular affine deformation zone in the middle part, and corrugation deformation zone in the upper part. Strain analysis shows that different structural styles are produced by the approximate horizontal shearing and its continuous upward migration. Chemical analysis reveals that gneissic granitic rocks possess the characteristics of crustal reformed S--type granite. In fact, these gneissic granitic rocks are resulted from autochthonous or near autochthonous shearing anatexis, whose protoliths are neritic-hypoabyssal clasolites. The depth of shearing anatexis is above 13km -15km,and the peak of shear deformation occurred on 2000Ma-1700Ma. |
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| Keywords: | granitic rocks strain analysis chemical analysis layering shear anatexis the Huangling formation western Guangdong |
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