吉林省长白县虎洞沟硅藻土矿床地质特征及成因浅析  

Geological features and genesis of the Hudonggou diatomite deposit in Changbai County,Jilin Province

作　　者：马骏雨 MA Jun-yu(Jilin Branch of China National Geological Exploration Center of Building Materials Industry,Changchun 130033,Jilin,China)

机构地区：[1]中国建筑材料工业地质勘查中心吉林总队,吉林长春130033

出　　处：《吉林地质》2021年第2期18-23,39,共7页Jilin Geology

摘　　要：长白县虎洞沟一带位于中国东北吉林省的长白山西南麓一带,大地构造位置位于华北陆块,龙岗(吉南)陆块及其北缘陆缘活动带。通过对虎洞沟硅藻土矿床的矿体特征、矿石质量及硅藻类型研究显示,该地区的硅藻土形成于新近纪中新世,矿体总体产状近于水平,矿体顶板倾角一般为0°~4°,底板倾角一般为0°~5°。矿层在含矿层(N_(1)m_(4))中,垂直方向具有明显韵律,推测是以生物沉积为主、机械沉积为辅的淡水湖泊相沉积。矿体的空间形态、分布受湖盆的古地理形态控制,凹处矿层变厚,凸起处矿层变薄,边缘处矿层尖灭。火山喷发物中的SiO_(2)为硅藻的生长提供了丰富的物质来源,同时玄武岩盖层对硅藻土矿起到良好保护作用。The Hudonggou area in Changbai County is located in the southwestern foothills of Changbai Mountain in Jilin Province,Northeast China.The tectonic position is located in the North China block,Longgang(Southern Jilin)block and its northern margin active belt.Research on the ore body characteristics,ore quality and diatom type of the Hudonggou diatomite deposit,it is shown that the diatomite in this area was formed in the Neogene Miocene,the overall occurrence of the ore body is close to horizontal,and the roof dip angle of ore body is generally 0°~4°,and the floor inclination angle is generally 0°~5°.In the ore-bearing layer(N_(1)m_(4)),the ore layer has obvious rhythm in the vertical direction.It is speculated that it was a freshwater lacustrine deposits dominated by biological deposition and supplemented by mechanical deposition.The spatial shape and distribution of the ore bodies are controlled by the paleogeographical shape of the lake basin.The ore bed in the depression becomes thicker,the ore bed at the protrusions become thinner,and the ore bed in the edges pinches out.The SiO_(2)in the volcanic eruption provides a rich material source for the growth of diatoms,and the basalt cover plays a good role in protecting the diatomite.

关 键 词：长白地区 虎洞沟硅藻土矿 地质特征 

分 类 号：P619.265[天文地球—矿床学]