地质论评2017，Vol.63Issue(2)：302-310,9.DOI:10.16509/j.georeview.2017.02.004
班公湖—怒江结合带西段沙木罗组底砾岩的新发现及地质意义
New Discovery of the Basal Conglomerate in the Upper Jurassic—Lower Cretaceous Shamuluo Formation in Western Part of Bangong Lake—Nujiang River Suture Zone and Its Geological Significance
摘要
Abstract
Late Jurassic—Early Cretaceous Shamuluo Formation outcropped along the middle—western segment of the Bangongco—Nujiang Belt.Upper Jurassic shore—shallow marine deposits are formed in relatively stable environments,Shamuluo Formation,was named after Shamuluo area of the southern Yanhu district of Geji country.The Structural Belt has been divided into Mugagangri Group and Shamuluo Formation by many geologists based on in different regions,but the stratigraphic sequence division of the two strata has always been characterized by lithologic assemblage difference or granule change.However,they haven't gotten the solid evidence of angular unconformity.At the bottom of the Shamuluo Formation in the Gengze area,the author discovered for the first time the top clayey weathering crust of the basal conglomerate and the underlying Mugagangri Group,which proved that the unconformitty of the two formations is credible.And then to determine the angle unconformity contact relationship between the Shamuluo Formation and the underlying Mugagangri Group.The discovery of the basal conglomerate is of great geological significance in studying the tectonic evolution of the Neo-Tethys ocean,the paleogeographic environment,the lower age limit of the Shamuluo Formation stratigraphy and the sedimentary facies.关键词
班公湖—怒江结合带/沙木罗组/底砾岩/角度不整合接触Key words
Bangong Co—Nujiang Juctional Zone/Shamuluo Formation/Basal Conglomerate/Angular Unconformity引用本文复制引用
邓金火,钟俊靖,袁振国,余江,杜昌法,唐宗源,孙社良,吕鑫,钟文,万川..班公湖—怒江结合带西段沙木罗组底砾岩的新发现及地质意义[J].地质论评,2017,63(2):302-310,9.基金项目
本文为中国地质调查“西藏康托地区矿产远景调查”项目(编号:12120113037600)资助的成果.This research was financially supported by the project from China Geological Survey Grant (No:12120113037600) （编号:12120113037600）
