桂西北隆或地区晚古生代地层沉积特征及台地沉积演化  

Sedimentary characteristics of Late Plaeozoic stratigraphy and evolution of isolated carbonate platform in Longhuo area,northwest Guangxi

作　　者：覃洪锋 李昌明 邓宾 蒋剑 尹庭旺 王学恒 李玉坤 QIN Hong-feng;LI Chang-ming;DENG Bin;JIANG Jian;YIN Ting-wang;WANG Xue-heng;LI Yu-kun(Guangxi Institute of Geological Survey,Nanning 530023,China;China-ASEAN Geosciences Cooper Center(Nanning),Nanning 530023,China)

机构地区：[1]广西壮族自治区地质调查院,南宁530023 [2]中国—东盟地学合作中心,南宁530023

出　　处：《桂林理工大学学报》2022年第1期1-14,共14页Journal of Guilin University of Technology

基　　金：中国地质调查局项目(121201009000172005);广西关键矿产资源深部勘查人才小高地项目(桂组通字[2019]85号)。

摘　　要：晚古生代右江盆地分布有众多规模不等的孤立碳酸盐岩台地,对台地形成与演化的研究对于认识右江盆地的构造演化、全球海平面变化等具有重要的意义。通过对隆或台地研究认为,盆地-台地间可划分为孤立台地相及斜坡-盆地相两大相区,并可以进一步细分为局限台地、开阔台地、台地边缘浅滩、台地边缘礁、台沟、台地前缘斜坡及深水盆地相7种沉积相类型。台地孕育于早泥盆世晚期,并逐步演化发展,至早三叠世最终消亡,可划分为孤立碳酸盐岩台地孕育阶段(D_(1)-D_(2))、孤立碳酸盐岩台地成型阶段(D_(3))、孤立碳酸盐岩台地持续演化阶段(C_(1)-P_(2))和孤立碳酸盐岩台地淹没收缩阶段(P_(3)—T_(1))等4个阶段。隆或台地是右江盆地在晚古生代发生了强烈的扩张、沉降,扬子台地边缘破裂形成规模不等的块体逐步向盆地内滑移并接受沉积形成的,其后逐步发展演化直到最终淹没消亡,该过程与右江盆地的构造演化密切相关,同时受全球海平面变化和盆地内陆源物质的输入影响。There are isolated carbonate platforms of different scales in Late Palaeozoic of Youjiang Basin.Longhuo platform is a small platform in the northwestern of the basin.The studies indicate that two facies regions and seven kinds of sedimentary facies can be identified.There are mainly isolated platform facies region,slope-basin facies region,and restricted platform,open platform,shoal of platform margin,reef of platform margin,the trench facies in platform,front slope of carbonate platform and deep water basin between platforms facies.The isolated carbonate platforms,most bred in early Devonian and submerged in the Early Triassic,can be divided into four evolutional stages,embryonic stage(D_(1)-D_(2)),forming stage(D_(3)),sustained development stage(C_(1)-P_(2))and submerged stage(P_(3)-T_(1)).During the Late Paleozoic period,the Youjiang Basin evolved from rifting to a small oceanic basin with intensive expansion and subsidence,while the southern margin of the Yangtze Platform experienced extension and breaking splitting.The formation and evolution of the platform are closely related to the tectonic evolution of Youjiang Basin,and are also affected by the global sea level rise and fall,and the input of terrigenous materials in the basin.

关 键 词：孤立台地 沉积特征 演化 晚古生代 右江盆地 

分 类 号：P512.2[天文地球—地质学]