隆林德峨地区晚泥盆世-早石炭世平行不整合及其意义探讨  

Late Devonian-Early Carboniferous parallel unconformity and its significance in De'e area of Longlin

作　　者：余树青 张喜 陆干强 周辉 李兴鹏[2] YU Shu-qing;ZHANG Xi;LU Gan-qiang;ZHOU Hui;LI Xing-peng(China-ASEAN Geosciences Cooperation Center(Nanning),Nanning 530023,China;No.4 Geological Team of Guangxi Zhuang Autonomous Region,Nanning 530032,China)

机构地区：[1]中国-东盟地学合作中心(南宁),南宁530023 [2]广西壮族自治区第四地质队,南宁530032

出　　处：《桂林理工大学学报》2021年第2期277-284,共8页Journal of Guilin University of Technology

基　　金：广西找矿突破战略行动地质矿产勘查项目(桂国土资函[2015]478,桂国土资函[2018]377)。

摘　　要：右江盆地晚泥盆世—早石炭世,存在着“F-F”事件以及“柳江运动”形成的石炭系与泥盆系的平行不整合界线。通过对隆林县德峨地区上泥盆统与下石炭统平行不整合进行系统的研究,从区域宏观特征、地层(生物带)的缺失,结合地层层序、沉积环境(相)的变化等地质特征进行了分析。研究区上泥盆统-下石炭统台地相存在短暂的暴露剥蚀,并缺失了5个牙形刺化石带;晚泥盆世—早石炭世,由于强烈拉张所形成的一条北西向拉张并伴随强烈左行走滑断裂,将北东盆抬升形成台地相以白云质灰岩、砂屑灰岩为主的局限半局限台地沉积,并形成沉积间断不整合面;南西盆则为深水盆地沉积的硅质岩、扁豆状灰岩,形成“北台南盆”的古地理局面;其与古特提斯海演化、右江盆地的伸展作用为主的构造格局密切相关。There is a "F-F" event and a parallel unconformity in Carboniferous and Devonian formed by "Liujiang movement" between the late Devonian and Early Carboniferous strata in Youjiang Basin. Based on the systematic study of the parallel unconformity between the upper Devonian and the lower Carboniferous in De’e area of Longlin County, this paper analyzes the regional macro characteristics, the lack of strata(biological belt), based on the changes of stratigraphic sequence and sedimentary environment(facies). The study finds out the upper Devonian Lower Carboniferous platform facies exposed and eroded for a short time.Five conodont fossil zones were missing from Late Devonian to Early Carboniferous, due to a NW extension by strong extension and accompanied by a strong left strike slip fault.The northeast basin was uplifted to form a set of restricted and semi-restricted platform sediments dominated by dolomitic limestone and sandy clastic limestone.The sedimentary platform was formed, closely related to the evolution of the paleo Tethys sea and the tectonic framework dominated by the extension of the Youjiang Basin.

关 键 词：晚泥盆世—早石炭世 平行不整合界线 伸展作用 右江盆地 

分 类 号：P534.4[天文地球—古生物学与地层学] P542.34[天文地球—地质学]