| 冀东太平寨附近太古宙变质岩的构造形式和变形史 |
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| 引用本文： | 徐树桐,张维民.冀东太平寨附近太古宙变质岩的构造形式和变形史[J].地质科学,1984,0(2):117-126. |
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| 作者姓名： | 徐树桐 张维民 |
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| 作者单位： | 安徽省地质科学研究所 |
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| 摘 要： | 研究地区的地层属太古宙迁西群底部上川组。本文涉及其中一部分约4平方公里的面积。岩石都已高度变质,属麻粒岩相的区域紫苏辉石带。由于缺乏顶、底及面向(facing)标志,无法确定其确切层序。
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| 关 键 词： | , |
STRUCTURAL STYLES AND DEFORMATION HISTORY OF ARCHEAN GRANULITES NEAR TAIPINGZHAI, EASTERN HEBEI PROVINCE, CHINA |
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| Xu Shutong,Zhang Weiming.STRUCTURAL STYLES AND DEFORMATION HISTORY OF ARCHEAN GRANULITES NEAR TAIPINGZHAI, EASTERN HEBEI PROVINCE, CHINA[J].Chinese Journal of Geology,1984,0(2):117-126. |
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| Authors: | Xu Shutong Zhang Weiming |
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| Institution: | Geological Institute of Anhui Province, Hefei |
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| Abstract: | The strata studied here are composed of Archean granulite of different kinds(from acid to ultra-mafic), in which fabrics of four generations may be discerned, though the earliest ones were obscured by deep metamorphism. Folds of first generation are isoclinal to close, the axial surface S1(//S’0)of which is gneissic schistosity or layering; fold axes of first generation were dislocated and traced along a great circle at first and a small circle secondly on the sterographical projections. The second generation folds are open(close, locally)in form, most axial surface S2 of which appears as fracture, partialy crenulation cleavage or my-lonitic one where a discontinuous deformation occurred in country rocks on either side of it(the ductile fault). Axes of second generation fold were dislocated during subsequent deformation and traced a small circle on the sterographical projection. The folds of third and fourth generations are of the flexure-slip ones; both of them, especially the latter one, are gentle folds. S3 and S4, the axial surfaces of third and fourth generation folds are fracture cleavage without exception; they are penetrative on the regional scale, though they spaced widely. The ductility of fabrics of these generations mentioned above decreased in turn and the contrast between the fabrics, associated migmatization of first generation and the orthers is so distinct that we can not help concluding that the first generation of deformation and associated migmatization did not take place in the same deformation(or oregenic)cycle with that of the latter ones. |
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