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ID:8268169
大小:4.57 MB
页数:6页
时间:2018-03-15
《基于重磁 遥感数据的昌都地区煤田构造格局研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第45卷第5期煤炭科学技术Vol?45No?52017年5月CoalScienceandTechnologyMay2017基于重磁-遥感数据的昌都地区煤田构造格局研究111123马志凯,曹代勇,宋时雨,乔小军,乔军伟,杨成(1?中国矿业大学(北京)地球科学与测绘工程学院,北京100083;2?中国煤炭地质总局航测遥感局,陕西西安710054;3?青海煤炭地质局,青海西宁810003)摘要:为了解决昌都地区煤田勘查基础薄弱、地质调查难度大的问题,利用重磁-遥感数据对昌都地区断裂分布及深部结构特征进行研究。重磁异常显示,澜沧江断裂为区域性深
2、大断裂,表现为相对低的长条状重力带,带内-540mGal,两侧-460mGal,以区域性的重力梯度带相隔。澜沧江断裂南侧表现出高密度、高磁性的特征;北侧重力场一般为-470~-500mGal,宽缓平稳,煤系多出露于相对重力高与相对重力低之间的过渡地带。基于OLI和DEM影像处理可知,盆地内断裂以北西-南东向为主,局部发育北东向断裂,断裂密度由南向北逐渐降低。昌都地区煤田构造格局以挤压为特色,煤系变形分区呈平行条带结构,变形强度由南向北递减,煤系主要分布于昌都盆地中段、北端及西北部。关键词:昌都地区;遥感解译;重磁异常;煤田构造中图分类号
3、:P631.2;P627文献标志码:A文章编号:0253-2336(2017)05-0148-06StudyoncoalfieldstructurecharacteristicsinChangduAreabasedonremotesensingandgravity-magneticdata111123MaZhikai,CaoDaiyong,SongShiyu,QiaoXiaojun,QiaoJunwei,YangCheng(1?CollegeofGeoscienceandSurveyingEngineering,ChinaUnivers
4、ityofMining&Technology,(Beijing)Beijing100083,China;2?Aerophotogrammetry&RemoteSensingBureauofChinaNationalAdministrationofCoalGeology,Xi’an710054,China;3.QinghaiBureauofCoalGeology,Xining810003,China)Abstract:InordertosolvetheweaknessofcoalfieldexplorationinChangduAreaa
5、ndthedifficultproblemofgeologicalsurvey,inthisarti⁃cle,thefracturedistributionanditsdeepstructurewereanalyzedthroughremotesensingdataandgravity-aeromagneticdata.GravityandmagneticanomaliesshowedthatLancangRiverfaultwastheregionaldeepfault,whichwascharacterizedbyrelativel
6、ylowandlongstripsofgravity.Gravityanomalywas-540mGalwithinthezone,-460mGalonbothsides,separatedwithregionalgravitygradientbelt.SouthsideofLancangRiverfaultshowedahighdensity,highmagneticcharacteristics.Thegravityfieldwascommonly-470~-500mGalonnorthside,andcharacterizedby
7、gentleandstablechanges.ThecoalmeasuresweremoreexposedintransitionalzonesbetweenrelativegravityhighandrelativegravitylowinChangduBasin.AccordingtotheOLIimagesandDEM,itcouldbeknownthatthefaultswerenorthwestmainly,andnortheastpartly.Fracturedensitygraduallyreducedfromthesou
8、thtothenorth.CoalfieldstructureframeworkofChangduAreawascharacterizedbyextrusion.Coaldeformationpartiti
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