山西五台山地区早前寒武纪年代构造格架  

THE EARLY PRECAMBRIAN CHRONOTECTONIC FRAMEWORK IN THE WUTAISHAN AREA,SHANXI

作　　者：王汝铮[1] 颜耀阳[1] 李惠民[1] 林源贤[1] 

机构地区：[1]地矿部天津地质矿产研究所,天津300170

出　　处：《前寒武纪研究进展》1997年第2期44-50,共7页Progress in Precambrian Research

基　　金：国家自然科学基金!49273179

摘　　要：根据作者等近１０多年来在五台山地区的早前寒武纪同位素地质研究，采用单颗粒锆石Ｕ－Ｐｂ、单颗粒结石蒸发Ｐｈ、常规钻石Ｕ．Ｐｈ、全岩Ｐｈ－Ｐｈ、全岩Ｒｂ－Ｓｒ、全岩Ｓｉｎ．Ｎｄ和角门石４０Ａｒ－３９Ａｒ等多种同位素测年方法获得的２７个数据，并以单粒颗锆石Ｕ－Ｐｂ法的９个年龄作为定年的基准，通过与其它同位素测年结果相互印证的综合研究，遂对五台山地区早前寒武纪重大地质事件年代给予了更进一步的限定，同时勾勒出了它的年代构造格架。The Wutaishan area is situated in the contral part of North China Platform. TheWutai Group consists of a volcanic-sedimentary formation of basic-intermediate acid volcanics andis intercalated with Algoma-type banded iron-formation. Its types of rocks principally includeamphibolite, leptynite, green-schist and phyllite. This group has been diVided into Shizui, theTaihuai and the Gaofan three subgroups and unconformably overlies rocks of the Fuping Group.The Hutuo Group is a huge Sedimentary Cycle consisting of the Deucun, the Dengye and theGuojiazhai three subgroups. This group is made up crystalline dolomite, Phylite, slate,metaconglotnerate, quartzite and metabasic volcanics. It has a contact relation of angularunconformity with the strata of underlying the Wutai Group and is overlain by the ChangchengSystem.This paper represents some results of U-Ph single zircon Sin--Nd whole rocks et al. sevenmethod isotope determinations. U-Pb 2450±10Ma (2a) and Sin-Nd 2369±30Ma (2) havebeen gaind from the Deucun Subgroup, U-Ph 2400±20Ma (2a) and Sin-Nd 2322±31Ma (2)from the Dengye Subgroup, and U-Ph 1758±14Ma (2) from the Fengkuangshan graniteinvaded the Hutou Group. The zircons represented by Bat, Wang (1992) from the Shifuo Gneissin the Xigou area have an age of 2549 f 22Ma (2a), and the different zircon populations from thesame Gneiss in the Xiarnatigou area have ages of 2483 i IMa (2a) and more than 2800Marespectively. The zircons from the Jinganku granite-gneiss which intruded the Wutai Group havean age of 2607±36Ma(2).These dating data are interpreted in this paper. It has been that about 2500Ma is the age ofWutai MoVement (Ⅲ) and the chronological boundary between the Archaean Wutai Group andthe Proterozoic Hutuo Group 2607Ma could be the age Of Wutai MoVement (Ⅱ), 2800Ma couldbe the age of zircons which crystallized during the Wutai MOvement (Ⅰ), 1760Ma is the age ofLuliang Movement (Ⅲ).

关 键 词：五台山 早前寒武纪 地质年代 年代构造格架 

分 类 号：P597.3[天文地球—地球化学]