摘要
无量山地区变质岩系变形变质特征一直存在较大争议。通过1∶50000保甸街幅、林街幅区域地质调查,对无量山主峰区域及无量山复式背斜核心地带变质岩系从构造解析入手,根据岩石组合及变形变质叠加等差异将其进一步划分为无量山岩群及邦伟岩组两大部分。前者斑状绿帘黑云斜长变粒岩中测得单颗粒锆石U-Pb同位素年龄值423±2.6Ma,十字蓝晶黑云斜长变粒岩中获单颗粒锆石U-Pb同位素年龄值448.0±2.1Ma,认为无量山岩群时代应归为早古生代。邦伟岩组明显比无量山岩群少一期构造变形,暂将其划归为晚古生代。
There has been significant controversy overthe deformation and metamorphic characteristics of the metamorphic rock series in the Wuliangshan area.Through geological surveys of the 1:50,000 Baodianjie and Linjie areas,the metamorphic rock series in the main peak area of Wuliangshan and the core area of Wuliangshan complex anticline were conducted structural analysis and further divided into two parts:Wuliangshan rock group and Bangwei rock group,based on differences in rock composition and deformation metamorphic superposition.U-Pb dating of single zircon grains from the porphyritic Porphyritic epidote-biotite-plagioclase granulite in the Wuliangshan rock group yielded an age of 423±2.6 Ma,while those from the staurolite-kyanite-biotite-plagioclase granulite yielded an age of 448.0±2.1 Ma,indicating an Early Paleozoic age for the Wuliangshan Group.The Bangwei rock groupis significantly less deformed than the Wuliangshan rock group,and is temporarily classified as the Late Paleozoic.
作者
董朝芳
蒋石飞
朱毅翔
马安妮
DONG Chao-fang;JIANG Shi-fei;ZHU Yi-xiang;MA An-ni(Yunnan Exploration Institute of Geology and Mineral Resources,Kunming 653100)
出处
《云南地质》
2024年第S01期1-9,共9页
Yunnan Geology
关键词
岩石组合
变形变质特征
邦伟岩组
无量山岩群
云南景东
Rock Assemblages
Deformationand Metamorphic Characteristics
Bangwei Rock Group
Wuliangshan Rock Group
Jingdong,Yunnan
作者简介
董朝芳(1988-),男,云南宣威市人,高级工程师,长期从事区域地质调查及矿产勘查工作。
