| 龙首山地块的归属问题:来自地壳结构和中—新元古代地层的证据 |
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| 引用本文： | 夏明哲,夏昭德,卢荣辉,姜常义.龙首山地块的归属问题:来自地壳结构和中—新元古代地层的证据[J].地球科学与环境学报,2011,33(2):132-136. |
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| 作者姓名： | 夏明哲 夏昭德 卢荣辉 姜常义 |
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| 作者单位： | 1. 长安大学地球科学与资源学院，陕西西安710054;长安大学西部矿产资源与地质工程教育部重点实验室，陕西西安710054
2. 四川华源矿业勘查开发有限责任公司,四川成都,610072 |
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| 基金项目： | 国家自然科学基金重点项目(40534020);国家自然科学基金项目(40872070) |
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| 摘 要： | 为了弄清楚龙首山地块的归属问题,对龙首山地块地壳结构和地层特征进行研究,发现龙首山地块具有由结晶基底和沉积盖层组成的双层地壳结构。该地块结晶基底由龙首山群组成,龙首山群岩性主要为一套条带状、眼球状混合岩夹斜长角闪岩、花岗质片麻岩、黑云斜长片麻岩等,普遍经历了角闪岩相区域变质作用。龙首山地块缺失长城系、青白口系和南华系,下部沉积盖层由蓟县系墩子沟群和震旦系顶部的烧火筒沟组构成。墩子沟群经历了埋藏变质作用,粉砂岩具千枚状构造,砂岩有一定程度的重结晶,地层层理保存完整。烧火筒沟组上部为含砾千枚岩、粉砂质千枚岩,下部为冰碛砾岩,冰碛砾岩总与寒武系含磷层相伴出现。地壳整体结构与华北克拉通基本特征相同,而扬子克拉通具有结晶基底、褶皱基底和沉积盖层3层地壳结构,与华北克拉通和龙首山地块迥异。因此,龙首山地块应归属于华北克拉通。
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| 关 键 词： | 扬子克拉通 华北克拉通 龙首山地块 地壳结构 结晶基底 沉积盖层 中—新元古代 |
Attribution of Longshoushan Terrane:Evidence from the Crustal Structures and Mesoproterozoic-Neoproterozoic Strata |
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| XIA Ming-zhe,XIA Zhao-de,LU Rong-hui,JIANG Chang-yi.Attribution of Longshoushan Terrane:Evidence from the Crustal Structures and Mesoproterozoic-Neoproterozoic Strata[J].Journal of Earth Sciences and Environment,2011,33(2):132-136. |
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| Authors: | XIA Ming-zhe XIA Zhao-de LU Rong-hui JIANG Chang-yi |
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| Institution: | XIA Ming-zhe1,2,XIA Zhao-de1,LU Rong-hui3,JIANG Chang-yi1,2(1.School of Earth Sciences and Resources,Chang'an University,Xi'an 710054,Shaanxi,China,2.Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education,3.Sichuan Huayuan Mining Exploitation Limited Company,Chengdu 610072,Sichuan,China) |
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| Abstract: | In order to study the attribution of Longshoushan Terrane,the crustal structure and stratigraphy of Longshoushan Terrane were discussed.Longshoushan Terrane has a double-crust structure with the crystalline basement and sedimentary cover.The crystalline basement composes of Longshoushan Group.Longshoushan Group is mainly banded-augen migmatite with amphibolite rocks,granitic gneiss,biotite-plagioclase gneiss interbedded and generally experienced amphibolite face regional metamorphism.The lower parts of sedi... |
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| Keywords: | Yangtze Craton North China Craton Longshoushan Terrane crustal structure crystalline basement sedimentary cover Mesoproterozoic-Neoproterozoic |
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