大兴安岭中北段头道桥一带晚古生代构造沉积环境分析  

LATE PALEOZOIC TECTONIC SEDIMENTARY ENVIRONMENT OF TOUDAOQIAO AREA IN THE NORTH-CENTRAL SECTION OF DAXINGANLING

作　　者：陈安霞 周多 张庆奎 关培彦 马良 邵学峰 费平 

机构地区：[1]辽宁省地质勘查院,辽宁大连116100

出　　处：《地质与资源》2014年第A01期1-7,共7页Geology and Resources

摘　　要：大兴安岭中北段头道桥一带晚古生代整体为弧后盆地构造环境,发育泥盆系—下石炭统泥鳅河组、大民山组与红水泉组地层.研究区泥鳅河组为浅海沉积,化石发育.在弧后拉张作用下地幔物质上涌,形成大民山组一段细碧岩系,并使地壳下沉,水体加深,在大民山组二段达到最深,为半深海沉积.后期由于陆陆碰撞作用,地壳抬升,红水泉组转为浅海环境,并使该组上部地层抬升出水面遭受剥蚀.Toudaoqiao area in the north-central Daxinganling,where Devonian-Lower Carboniferous Niqiuhe,Daminshan and Hongshuiquan formations are developed,belonged to back-arc basin tectonic environment in Late Paleozoic Era.The Niqiuhe Formation was shallow sea sediment rich in fossils.With back-arc extension,the mantle material upwelled along the discordogenic faults to form the spilite series in the first member of Daminshan Formation.Meanwhile,with crustal subsidence,water deepened and reached the deepest at the second member of Daminshan Formation,which became bathyal deposit.Due to the later continent-continent collision,earth crust was compressed and uplifted,when the Hongshuiquan Formation turned to neritic environment and was denuded.

关 键 词：弧后盆地 沉积环境 构造成因 细碧-角斑岩 含放射虫硅质岩 大兴安岭 

分 类 号：P542.3[天文地球—构造地质学] P512.2[天文地球—地质学]