塔里木盆地北部早古生代早—中奥陶世一次典型的碳酸盐岩台地沉没事件  

A TYPICAL CARBONATE PLATFORM DROWNING EVENT DURING EARLY MIDDLE ORDOVICIAN IN NORTH TARIM BASIN

作　　者：蔡忠贤 贾振远 肖立新[1] 

机构地区：[1]新疆石油管理局地质调查处

出　　处：《现代地质》1998年第1期32-39,共8页Geoscience

摘　　要：沉没事件是碳酸盐岩台地发育、演化终止的一个重要标志，它具有特定的地质、地球化学及地震反射特征。地质上它是一个具阶段性的沉没过程，并由两个阶段的沉没层序来反映。两层序间可以是过渡的或以一真正的沉没不整合分割。早期阶段的沉没层序不总是向上变深的，它可以与Ｖａｉｌ等提出的层序具类似的特征。地球化学上响应为常量和微量元素的突变性增高。地震剖面上则表现为明显的双相位反射和界面之上的盆底上超。研究表明塔里木盆地以晚期阶段的沉没为主。The drowning event is a key marker representing the termination of carbonate platform development and has some features of geology, geochemistry and seismic reflection. Geologically, it is a drowning process with stages reflected by two drowning sequences. Gradational strata or a true unconformity exist between the two sequences. Early drowning sequence is not always upword deeping and is similar as Vail′s sequence. Geochemically, abrupt increase in the constant and trace elements content responds to the drowning. Seismically, it shows obvious double phase reflector and basinal marine onlap above the carbonate sequence boundary.

关 键 词：沉没事件 沉没层序 碳酸盐岩 盆地 奥陶世 地层 

分 类 号：P534.42[天文地球—古生物学与地层学] P512.2[天文地球—地质学]