滇黔桂盆地及其邻区晚古生代层序地层格架及相对海平面变化  

SEQUENCE-STRATIGRAPHIC FRAMEWORK AND RELATIVE SEA- LEVEL CHANGES OF LATE PALEOZOIC IN THE DIANQIANGUI BASIN AND ITS ADJACENT AREAS

作　　者：梅冥相[1] 马永生[1] 高金汉[1] 孟庆芬[1] 易定红[1] 李东海[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083

出　　处：《现代地质》2002年第4期365-373,共9页Geoscience

基　　金：中国石油化工集团公司科技工程项目 (NPJ -0 180 0 -2 )。

摘　　要：受同生断裂的控制 ,在晚古生代滇黔桂盆地及邻区形成特殊的“台—盆—丘—槽”的古地理格局 ,发育了复杂而有序的盆地充填序列。根据三级沉积层序的两大特性 ,在滇黔桂盆地及邻区的晚古生代地层中识别出 2 5个三级沉积层序 ;以地层记录中的的两种相变面和两种穿时性界面为关键 ,建立了晚古生代的区域层序地层格架。研究表明 ,地层记录中的层序界面大致可以划分为 4种类型 ,即构造不整合面、沉积不整合面、淹没不整合面以及它们的相关面 ,而且它们还可以进一步归为暴露间断面以及加深间断面两种范畴的界面。Controlled by the syn-depositional faults, a special paleogeographic pattern of Late Paleozoic that is marked by 'platform-basin-hill-trough' and a regular and sophisticated filling succession of sedimentary basin are formed in the Dianqiangui Basin and its adjacent areas. In terms of two elementary natures of third-order sequences, 25 third-order sequences could be discerned in the strata of Late Paleozoic in the Dianqiangui Basin and its adjacent areas. On the basis of two facies-changing surfaces and two diachronisms, the regional sequence-stratigraphic framework of Late Paleozoic in the Dianqiangui Basin and its adjacent areas could be constructed. According to this study, sequence boundaries could be divided into four types: tectonic unconformity, sedimentary unconformity, drowning unconformity and their correlative surfaces; they could be still grouped into an exposed punctuated surface and a deepened punctuated surface.

关 键 词：海平面变化 晚古生代 层序地层格架 滇黔桂盆地 同生断裂 

分 类 号：P534.4[天文地球—古生物学与地层学] P539.[天文地球—地质学]