| 甘肃敦煌-北山早前寒武纪岩石组合-构造初步框架 |
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| 引用本文： | 梅华林,于海峰,李铨,左国朝.甘肃敦煌-北山早前寒武纪岩石组合-构造初步框架[J].地质调查与研究,1997(4). |
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| 作者姓名： | 梅华林 于海峰 李铨 左国朝 |
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| 作者单位： | 地矿部天津地质矿产研究所!天津３００１７０(梅华林，于海峰，李铨)，甘肃地质矿产局!兰州７３００００(左国朝) |
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| 基金项目： | “九五”地矿部资源与环境科技攻关课题!95—02—011—02 |
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| 摘 要： | 甘肃敦煌－北山地区广泛出露早前寒武纪岩石。这些岩石在早期的《甘肃省区域地质志》中被确定为前长城系、长城系、奥陶－志留系及部分石炭系。本文认为这些岩石应属太古宙和古元古代。据此，重新厘定了该区早前寒式纪岩石－构造框架。自南向北划分为敦煌太古宙杂岩区、北山南带古元古代剪切构造区和北山北带古元古代－太古宙杂岩区，并根据变形特点和岩石组合，进一步划分出次级带。
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| 关 键 词： | 岩石－构造分区 早前寒武纪 敦煌－北山地区 |
PRELIMINARY LTTHO-TECTONIC FRAMEWORK OF EARLY PRECAMBRIAN ROCKS IN DUNHUANG-BEISHAN AREA,GANSU, WEST CHINA |
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| Met Hualin, Yu Haifeng ,and Liquan.PRELIMINARY LTTHO-TECTONIC FRAMEWORK OF EARLY PRECAMBRIAN ROCKS IN DUNHUANG-BEISHAN AREA,GANSU, WEST CHINA[J].Geological Survey and Research,1997(4). |
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| Authors: | Met Hualin Yu Haifeng and Liquan |
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| Abstract: | Early - Precambrian rocks are widely exposed in Dunhuang-Beishan area, GansuProvince. The Precambrian rocks are traditionally defined as strata of Pre-Changchengian,Ordovician-Silurian, Carboniferous and Baihu Group. According to field investigation, the rocksare reinterpreted as Aichaean and Palaeoproterosoic ages. They can be divided into three terrainsfrom south to north: Dunhuang mctamorphic terrain, south Beishan palaeoproterozoic tectonicterrain and north Beishan Archaean-Palaeoproterozoic terrain. These terrains can be furtherdivided into litho-structural zones(belts) according to deformation ard metamorphism, that is:Hongliuxia-Dunhuang Metasedimentary Belt, Anxi-Cijin TTG Belt, Baidunzi-Qiaowan Shearsone within the Dunhuang terrain; Xiaoxigong-Sishilijing Palaeoproterozoic shear zone andYamajie-Mazongshan Palaooproterozoic Shear zone within the south Beishan. |
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| Keywords: | Litho-tectonic Framework Precambrian Dunhuang-Beishan area |
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