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时间:2020-03-23
《南岭成矿带前寒武纪地层区划与岩石地层的厘定.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第30卷第4期华南地质与矿产Vo1.3o,No.4,308—3182014年12月GeologyandMineralResourcesofSouthChinaDec.,2014doi:10.3969/j.issn.1007—3701.2014.04.002南岭成矿带前寒武纪地层区划与岩石地层的厘定牛志军,杨文强,刘浩,宋芳NIUZhi-jun,YANGWen—qiang,LIUHao,SONGFang(中国地质调查局武汉地质调查中心,中国地质调查局古生物与生命一环境协同演化重点实验室,武汉430205)(WuhanCent
2、erofGeologicalSurvey,CGS;KeyLaboratoryforPaleontologyandCoevolutionofLifeandEnvironment,CGS,Wuhan,430205)摘要:南岭成矿带前寒武系为金、铁、锰、磷及铅锌的赋矿层位,近年来由于高精度测年数据的应用,建立了较为清晰的年代地层格架,然而由于历史原因,前寒武系岩石地层序列在湘黔桂赣粤交界地区存在同物异名现象,不利于地质矿产图的编制,需要重新厘定完善。本文以武陵运动构造面为界,将南岭成矿带大地构造演化分为两个阶段,按中元古代至青白
3、口纪早期、青白口纪晚期至震旦纪划分出不同地层区。早期划分出两个地层区一扬子与华夏地层区,晚期同属于华南地层区,依据处于盆地不同位置,再划分为六个地层分区。本文重点对湘黔桂交界地区的青白口系上部层位、赣湘桂地区南华系和震旦系进行了梳理,初步形成前寒武纪岩石地层序列,不再采用部分岩石地层单位,以便于编制该地区地质矿产图。关键词:南岭成矿带;青白口系;南华系;震旦系中图分类法:P534.1文献标识码:A文章编号:1007—3701(2014)04.308.11NiuZJ,YangWQ,LiuH,SongF.Precambrian
4、stratigraphicregionalizationandredefinitionofsomelithostratigraphicunitsinNanlingMetallogenicBelt.GeologyandMineralResourcesofSouthChina,2014,30(4):308-318.Abstract:PrecambriansysteminNanlingMetallogenicBeltisthelayerofocculTenceofgold,iron,manganese,phosphorus,an
5、dlead&zinc.Chronostratigraphicframeworkhasbeenwell-groundedredefined,basedonpubli-c~ionofaseriesofhighaccuracydmingdata.Meanwhile,synonyms,whichhavenegativeeffectsongeologicalmapping,stilloccurinstratigraphicsequencesofPrecambrianSystemofthearea,andthatshouldbeela
6、boratelyredefined.Inthispaper,stratigraphicregionalizationofMesoprotozoictoearlyQingbaikouanandlateQingbaik-ouantoSinianinNanlingMetallogenicBeltdifferonthebasisoftwostagesoftectonicevolution,whichcouldbedividedbyangularunconformitybetweenLengjiaxiandBanxiGroups,g
7、eneratedbyWulingOrogeny.EarlystageisdividedintoYangtzeandCathaysianstratigraphicregions;andthelateintosixstratigraphicsub-regions,allofwhichbelongtoSouthChinaregion,accordingtotheirdifferentlocationsinthedepression.ThepaperfocusesonteasingouttheupperpartofQingbaik
8、ouanSysteminborderlandofHunan,GuizhouandGuangxi,togetherwithNanhuatoSinianSystemsinJiangxi,HunanandGuangxi,abolishingsomelithostratigraphicunits’names,i
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