摘要
龙井市天宝山水泥用大理岩矿大地构造位置为柴达木-华北板块(Ⅲ)、华北陆块北部陆缘造山带(ⅢA)、哈兰达岭-英额岭新元古代-古生代叠覆造山亚带(ⅢA1)、石咀子-山秀岭晚古生代弧盆系(ⅢA12)。根据矿体特征、矿石质量、矿床成因研究显示,该地区水泥用大理岩矿形成于石炭系上统天宝山组。地层总体产状走向320°~340°,倾向230°~250°,倾角45°~60°,大理岩矿体赋存于二段(C_(2)t^(2))中。在古生代晚石炭世由浅海滨海相沉积了天宝山组碳酸盐岩建造,形成了以灰岩为主,泥灰岩、粉砂岩次之的岩石组合类型;后期由于印支期、燕山期构造及喜马拉雅运动,使区内古生代地层普遍遭受了区域变质作用,致使原始沉积的岩石发生区域变质重结晶,形成了大理岩矿床及结晶灰岩、粉砂质板岩与碳质板岩。古生界石炭系天宝山组大理岩是本区的主要找矿标志。
The tectonic location of the Tianbaoshan and mudstone marble mine in Longjing City is the Qaidam North China Plate(Ⅲ),the northern margin orogenic belt of the North China Block(ⅢA),Halandaling-Ying'eling Neoproterozoic Paleozoic overlapping orogenic subbelt(ⅢA1),Shizuizi-Shanxiuling Late Paleozoic Arc Basin System(ⅢA12).According to the characteristics of the ore body,the quality of the ore,and the genesis of the ore deposit,it is shown that the cement using marble ore in this area was formed in the Tianbaoshan Formation of the Upper Carboniferous System.The overall orientation of the strata is between 320°340°,Tend towards 230°250°,Tilt angle 45°60°,The marble ore body occurs in the second section(C_(2)t^(2)).The Tianbaoshan Formation carbonate rock series was deposited from shallow marine to coastal facies in the Late Carboniferous of the Paleozoic era,forming a lithological assemblage primarily composed of limestone,with mudstone and siltstone as secondary components.Due to the tectonic activities of the Indosinian,Yanshanian and Himalayan movement in the later stage,the Paleozoic strata in the area have generally undergone regional metamorphism.Causing regional metamorphism and recrystallization of the original sedimentary rocks,Formed marble deposits and crystalline limestone,silty slate,and carbonaceous slate.The Paleozoic Carboniferous Tianbaoshan Formation marble is the main prospecting indicator in this area.
作者
冯时
FENG Shi(Jilin Branch of China National Geological Exploral Exploration Center of Building Materials Industry,Changchun 130033,Jilin,China)
出处
《吉林地质》
2025年第3期59-63,共5页
Jilin Geology
关键词
龙井市
水泥用大理岩
地质特征
成矿浅析
Longjing City
marble for cement use
geological features
preliminary analysis of mineralization
