青海省下中侏罗统含煤岩系沉积特征及聚煤作用  

Coal-bearing Strata Sedimentary Features and Coal Accumulation Process in Lower Middle Series, Jurassic System, Qinghai Province

作　　者：邓文诗 张丽霞 成永盛 

机构地区：[1]青海煤炭地质一0五勘探队,青海西宁810007

出　　处：《中国煤炭地质》2009年第A02期14-18,56,共6页Coal Geology of China

摘　　要：青海省煤炭资源丰富,以侏罗系煤为主,分布于北纬36°线以北的广大地区。下侏罗统由砂砾岩,角砾岩及砂岩,泥岩和煤层交替组成,夹菱铁矿及油页岩,以山间盆地急流河床或三角州堆积为主,间有短暂的湖泊—沼泽相沉积环境,相变迅速、稳定性差,以小煤沟区沉积厚度最大。中侏罗统自下而上分为主含煤段和次含煤段,以江仓地区发育最为完整。根据构造单元及含煤性由北向南可分为祁连山聚煤带、柴达木盆地北缘聚煤带及昆仑山—积石山聚煤带。The Qinghai Province is abundant in coal resources, mainly Jurassic coals, distributed in vast areas to the north of the latitude N36o. Lower Series of Jurassic System is composing of sandy conglomerate, breccia, sandstone and alternating mudstone and coal seams, intercalated with siderite and oil shale. Sedimentary environment is mainly intermountain basin torrent fiver channel or deltaic deposit, occasionally ephemeral lacustrine-marsh facies, and facies changed rapidly brought on poor stability, the maximum sedimentary thickness is in the Xiaomeigou area. From bottom to top, the Middle Series, Jurassic System can be divided into main coal-beating member and secondary coal-beating member, perfectly developed in the Jiangcang area. Based on structural elements and coal-bearing properties, the area can be divided from north to south into Qilianshan Mountains, Qiadam Basin north margin and Kunlun Mountains-Anyemaqen Mountains coal accumulation belts.

关 键 词：沉积环境 聚煤带 下中侏罗统 青海省 

分 类 号：P618.110.2[天文地球—矿床学]