广东高要—广宁地区兰源—江屯动力变质带的地质特征...
文章关键词:
动力 变质带 金矿 分布 地质特征
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REA,GUANGDONGPROVINCELiUGuanglongandLiangHanqun(No.19GeologicalPartyofBureauofGeologyandMineralResourcesofGunngdongProvinee.Zhaoqlng1AbstraOtTheLanyuan--JiangtundynamometamofphjcbeltislocatedinthenortheastcontinuationoftheGuangning--LuodingfracturezoneonthesoutheastflankoftheGuangdong--GnangxiupwarpingregionandthenorthWestSideoftheWuchuan--Shihujfoldzone.ItiSdistributedlar—gelYintheGuangninggranitlCcomplexandthesedimentary—metamorphicfOCksofSiniancFormation.Thedynamemetamorphlcbettwhichhasacompresso--shearnatureiSmorethan120kmjn1engthand1—2kminbreadth,withstrlkegenerallyN4o。EandlocallYNTO。E.Secondaryor1ate..stagefaultsarewell—.developedinthedynamo..metamorphicbeltasaconsequenceofrepeatedtectonicactlvity.ItiSindeedawidecompresso~crushedzonecomprlsedofcrushedgranlteandmylozltinedandschjStosizedrockSshowingsha11OW—seatedbritt1edefor—marioncharacterlstlCS.Aboutevery25—3OkmalongthisNE—trendlngzone,thereoccursacompoundingpositionwiththeE—Wtrendingstrut—turewheresecondaryorlate—stagefaultsareparticularlydeveloped.Sincethesecondaryorlate..stagefaultsarethechiefore..control1lugsiructureinthiSurea,thecompoundingposltionsmentionedaboveareoftenthe1ocatlonswherenlobium—tantalumandgoldmineralizationsareconcentrated.ThesepositionsareevidentlYequal1Yspacedatintervalofabout25—3Okm.Moreover,theniobium—tantalumandgolddepositsformtwoNE—trendingbeltssidebyside,withtheniobium—tantalumbeltonthenorthwestandthegoldbeltOnthesoutheast.TheintimateRSSOCiationofthesetwobeltsi11Spaceseamstodemonstratethatt
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