阿拉克湖幅地质调查新成果及主要进展  

New results and major progress in regional geological survey of the Alag Lake Sheet

作　　者：王国灿[1] 贾春兴[2] 朱云海[1] 向树元[1] 林启祥[1] 王青海[2] 安守文[2] 朱耀生[2] 

机构地区：[1]中国地质大学地质调查院,湖北武汉430074 [2]青海省地质调查院,青海西宁810012

出　　处：《地质通报》2004年第5期549-554,共6页Geological Bulletin of China

基　　金：中国地质调查局青藏高原1:25万阿拉克湖幅(I47C001001)地调项目成果。

摘　　要：将东昆仑造山带划分为东昆北古老基底单元、东昆中早古生代构造混杂岩带、东昆南早古生代构造混杂岩带、马尔争-布青山晚古生代构造混杂岩带和巴颜喀拉山三叠纪浊积盆地5个次级构造单元,重新厘定了东昆仑不同构造混杂岩带的组成、结构、性质和时代,恢复了古海盆的演化历史。通过成分分析和颗粒裂变径迹年龄分析,确定了测区巴颜喀拉山群物源来自北部,基底性质可与马尔争-布青山带相对比,恢复了巴颜喀拉山群经历的构造热历史。运用构造年代学分析方法限定了测区经历的几次重大地质历史转折事件。确定了测区浆混花岗岩的存在。通过构造地貌和第四纪沉积分析,揭示了测区第四纪成山作用过程、水系变迁过程和古环境古气候演变过程。新发现一中型砂岩型铜矿。The East Kunlun orogenic belt is divided into five tectonic units, i.e. the eastern North Kunlun basement unit, central East Kunlun Early Paleozoic tectonic mélange belt, southern East Kunlun Early Paleozoic tectonic mélange belt, Maerzheng-Buqin Mountain Late Paleozoic tectonic mélange belt and Bayan Har Triassic turbidite basin. The components, structures, characters and ages of those different mélange belts are redefined, and history of the paleo-ocean evolution is reconstructed. By composition analysis and grain fission-track dating, the authors have determined that the provenance of the Bayan Har Mountain Group in the survey area is in the north, and that the basement of the group can correlate with that in the Maerzheng-Buqin Mountain mélange belt, and the tectonic-thermal history of the Bayan Har Mountain Group has been reconstructed. Using the tectono-chronology analysis, the authors have defined several important tectonic events experienced by the area. By field investigation and composition analysis, a mixed magmatic granite body has been determined. By analyses of the tectonic geomorphology and Quaternary deposits, the mountain building process, water drainage system change process and plaeoenvironmental-climatic change process have also been revealed. A medium-sized sandstone copper deposit has been found.

关 键 词：东昆仑山 马尔争-布青山 构造混杂岩 角度不整合 华力西造山 巴颜喀拉山群 区域构造与演化 高原隆升 第四纪地质与环境 

分 类 号：P623.12[天文地球—地质矿产勘探]