| 丹凤地区刘岭群倒转变质带及其地质意义 |
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| 引用本文： | 胡能高,安三元,甘云兰.丹凤地区刘岭群倒转变质带及其地质意义[J].地球科学与环境学报,1990(1). |
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| 作者姓名： | 胡能高 安三元 甘云兰 |
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| 作者单位： | 西安地质学院地勘系
(胡能高，安三元)，西安地质学院地勘系(甘云兰) |
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| 摘 要： | 根据变质矿物组合和变质带的特征,结合变形构造研究,认为丹凤地区的刘岭群曾遭受过中压相系的变质作用,随后又被褶皱及剪切推覆作用改造,使变质带倒转、变薄。文章认为,本区刘岭群在时代上不能与西部邻区的中泥盆统地层对比。
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| 关 键 词： | 东秦岭 变质带 刘岭群 |
THE REVERSED METAMORPHIC ZONE OF LIULINGGROUP IN DANFENG DISTRICT AND ITSGEOLOGICAL SIGNIFICANCE |
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| Hu Nenggao An Sanyuan Gan Yunlan.THE REVERSED METAMORPHIC ZONE OF LIULINGGROUP IN DANFENG DISTRICT AND ITSGEOLOGICAL SIGNIFICANCE[J].Journal of Earth Sciences and Environment,1990(1). |
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| Authors: | Hu Nenggao An Sanyuan Gan Yunlan |
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| Institution: | Xi'an College of Geology |
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| Abstract: | The mineral associations are described, the metamorphic zones are divided, and the metamorphic conditions are discussed in this paper. The characteristics of the mineral associations and the sequences of the metamorphic zones of the Liuling Group in the Danfeng district are similar to those of the Barrow type metamorphic terrain, which shows that these metamorphic rocks are the products of medium pressure metamorphism. The kyanite-zone is the highest temperature zone in the terrain.lt is distributed along the narrow district which is several kilometers long from the Shang-dan fault. The metamorphic zones in the north of this terrain arc reversed and thinned by the napping and folding movement which take place after the main metamorphic phase. The age of the Liuling group in the Danfeng district is discussed in this paper.The authors think that the Liuling group in this district can not be compared with the middle Devonian in the western neighbouring district.The strata which are metamorphosed under the conditions of the kyanite and garnet zones are the nappe sheets which can not be compared with the strata in the western neighbouring district.It is possible that the age of the nappe sheets is older that the middle Devonian. |
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| Keywords: | East Qinling metamorphic zone Liuling group |
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