琼东定安翰林地区晚寒武世地层的厘定及其地质意义  

Determination of late Cambrian stratum in Hanlin area of Ding'an in eastern Hainan and its geological significance

作　　者：李孙雄[1] 陈沐龙[1] 云平[1] 江宏伟[1] 汪焰华[1] 龚丹[1] 

机构地区：[1]海南省地质调查院,海南海口570206

出　　处：《矿产与地质》2014年第3期278-283,共6页Mineral Resources and Geology

摘　　要：蒙花岭组是新建的岩石地层单位,指定蒙花岭剖面为正层型剖面。岩性为一套高绿片岩相的变质岩,由变质石英细砂岩、各类片岩、绢云千枚岩夹细粒石英岩及数层变质基性―酸性火山岩组成。在剖面的下部第8层及上部第24层含丰富的藻类化石,地质时代为寒武纪;在剖面中部第16层变质火山岩中采人工重砂样、锆石U-Pb测年结果为499±6Ma^527±48Ma,地质时代为寒武纪中晚期。故将蒙花岭组划寒武系黔东统(∈2)到芙蓉统(∈4)。Menghualing Formation is a newly-created rock stratigraphic unit,which assigns Menghualing pro-file as the holostratotype profile.Its lithology is a set of metamorphic rock of high density greenschist facies, which is composed of metamorphic fine quartz sandstones,different schists,sericite phyllites with fine-grained quartzites and several beds of metamorphic basic-acidic volcanic rocks.In the 8th bed of inferior pro-file and 24th bed of superior profile,there are abundant alga fossil geologically aging in Cambrian.In the metavolcanite of the 1 6th bed of middle profile,artificial panned samples were collected,and the dating re-sult of acorite U-Pb is 499 ± 6 ~ 527 ± 48Ma,which means that its geologic age is middle-late Cambrian. Therefore,in this study the Menghualing Formation is divided into Cambrian Qiandong Series （∈2 ）and Fu-rong Series （∈4 ）.

关 键 词：新建 蒙花岭组 寒武纪 海南 

分 类 号：P534.41[天文地球—古生物学与地层学]