准东构造隆升对砂岩型铀成矿作用的制约:磷灰石裂变径迹证据  

Uplift-Denudation of Orogenic Belts Control on the Formation of Sandstone Type Uranium(U) Deposits in Eastern Junggar, Northwest China:Implications from Apatite Fission Track(AFT)

作　　者：宋继叶[1,2] 秦明宽 蔡煜琦[1,2] 郭强 何中波[1,2] 刘章月 曹煦[3] 陈志国 Song Jiye;Qin Mingkuan;Cai Yuqi;Guo Qiang;He Zhongbo;Liu Zhangyue;Cao Xu;Chen Zhiguo(Beijing Research Institute of Uranium Geology,Beijing 100029,China;Key Laboratory of Uranium Resources Prospection and Evaluation Technology,CNNC,Beijing 100029,China;China University of Geosciences,Beijing 100083,China;Tianjin North China Geological Exploration Bureau,Tianjin 300170,China)

机构地区：[1]核工业北京地质研究院,北京100029 [2]中核铀资源与评价技术重点实验室,北京100029 [3]中国地质大学,北京100083 [4]天津华北地质勘查局,天津300170

出　　处：《地球科学》2019年第11期3910-3925,共16页Earth Science

基　　金：国防预研项目(No.3210402);国防科工局核能开发科研项目(No.D1302);中核集团“龙腾2020”科技创新计划项目

摘　　要：通过实测磷灰石裂变径迹方法,并结合前人研究结果,分析了准东构造隆升特征,探讨了其与地层沉积、构造响应及对砂岩型铀成矿的制约.研究表明,210~180 Ma,准东缘卡拉麦里地区持续隆升遭受剥蚀,而卡拉麦里山北部奥克什山地区隆升-剥蚀时间相对较晚,于160~80 Ma快速隆升,该期快速隆升控制了五彩湾-老君庙-将军庙与卡姆斯特地区沉积地层发育、古水流方向、区域不整合与构造掀斜等,从而控制着2个地区的砂岩型铀矿成矿条件.五彩湾-老君庙-将军庙地区下侏罗统物源充足、砂体与氧化发育,是该地区主要找矿目的层,而卡姆斯特地区随着晚侏罗世-晚白垩世,盆地东北部奥克什山乃至青格里底山的隆升,增加了物源供给,下侏罗统沉积地层在该地区表现出了更好的成矿潜力.Apatite fission track dating and thermal history modeling were carried out on 12 granite samples collected from Kalamaili and Aokeshi Mountain in Eastern Junngar to investigate the uplift-denudation processes and characteristics of mountains,and then to discuss its control on sandstone U mineralization.Analyses results reveal the tectonic differential uplift-denudation of Kalamaili and Aokeshi Mountain,with Kalamaili area having been uplifting and being eroded since Late Triassic,much earlier than Aokeshi Mountain with uplifting in Late Jurassic,which plays an essential role in sandstone type U mineralization,including U source condition,the formation of tectonic-slope,favorable metallogenic structure and stable groundwater dynamics.The sandstone type U mineralization is different between the areas of Wucaiwan-Laojunmiao-Jiangjunmiao and Kamusite due to the differential uplift-denudation of the mountains under the tectonic background of transition from Indosinian to Yanshanian periods.Generally speaking,the conditions were better in Wucaiwan-Jiangjunmiao area in Early-Middle Jurassic while the conditions were better in the latter in Late Jurassic.Our study is a kind of sandstone type U mineralization which is going to provide the basic geology criteria for U resource prognosis.

关 键 词：磷灰石裂变径迹 构造隆升-剥蚀 砂岩型铀矿成矿条件 准东 构造地质 

分 类 号：P612[天文地球—矿床学]