滇东北上二叠统煤系火山碎屑岩特征及意义  

Upper Permian Coal Measures Pyroclastic Rock Features and Significance in Northeastern Yunnan

作　　者：李聪聪[1,2] 郭英海[2] 孙顺新[1] 张光超[1] 乔军伟[1] 

机构地区：[1]中国煤炭地质总局航测遥感局,陕西西安710054 [2]中国矿业大学,江苏徐州221008

出　　处：《中国煤炭地质》2015年第7期11-14,共4页Coal Geology of China

基　　金：中国地质调查"云南省彝良县彝良-两河煤矿区煤炭资源调查评价"(1212011220764);中央地质勘查基金"云南省昭通市彝良向斜南翼东段勘查区煤炭资源普查"(2007531006)项目

摘　　要：上二叠统煤系是滇东北地区主要的含煤岩系,该含煤组合是在晚二叠世早期峨眉山玄武岩喷发的基础上沉积形成的,间歇的火山活动贯穿了整个晚二叠世含煤地层沉积的过程。以研究区及邻区以往研究成果为基础,结合野外地质调查、钻探等资料,对含煤地层中火山碎屑岩发育特征及其对聚煤作用和煤系矿产的指示意义进行了分析,认为该区晚二叠统含煤地层中火山碎屑岩从下至上大致分为三类:凝灰岩、凝灰质泥岩及高岭石泥岩(Tonsteins),且符合从西向东层数逐渐减少,厚度逐渐变薄的规律,揭示了从早期到晚期火山活动逐渐减弱。同时火山碎屑岩是煤系矿产稀散元素(镓、铌)的赋矿层位,其对应的自然伽马曲线呈现高异常,建议下一步工作中注意煤系矿产的调查研究。The upper Permian coal measures is the main coal-bearing rock series in northeastern Yunnan. The coal-bearing assemblage was deposited on the basis of earlier late Permian Emeishan basalt eruption. Based on study area and neighboring areas past studied results, comprehensively analyzed field geological investigation and drilling data, in allsion to pyroclastic rock development features in coal-bearing strata and its indicative significance on coal accumulation and minerals in coal measures carried out analysis. The result considered that the upper Permian coal-bearing strata pyroclastic rocks in the area can be classified into three kinds from bottom to top： tuff, tuffaceous mudstone and tonstein; it is conformed to regulation of layer numbers and thickness gradually decreasing from west to east, thus revealed volcanic activities gradually weakening from initial stage to later period. Again, pyroclastic rocks are hosting horizons for coal measures dispersed elements（gallium, niobium）, and corresponding to high anomaly on gamma-ray traces. It is suggested that should pay attention to investigation and study on coal measures minerals.

关 键 词：滇东北 晚二叠统 火山碎屑岩 

分 类 号：P588.211[天文地球—岩石学]