右江沉积盆地的性质及演化讨论  

NATURE AND EVOLUTION OF THE YOUJIANG BASIN

作　　者：陈洪德[1] 曾允孚[1] 

机构地区：[1]成都地质学院沉积地质矿产研究所

出　　处：《沉积与特提斯地质》1990年第1期28-37,共10页Sedimentary Geology and Tethyan Geology

基　　金：国家自然科学基金

摘　　要：前言右江盆地是指海西—印支期由师宗—弥勒断裂、红河断裂、紫云—南丹—河池断裂和灵山断裂所围限的滇黔桂地区。长期以来,由于该盆地所处的特殊构造背景、独特的岩相-构造格局和丰富的矿产资源,许多地质工作者都予以充分注意,对该盆地的性质提出了众多有益的观点和认识,除传统的槽、台、洼学说外,先后有“弧间盆地或弧后盆地”、“湘桂边缘海”、“弧后裂谷地槽”、“右江裂谷带”和“裂陷槽”等等。笔者参考了这些前人的工作成果,并据自己的研究,参与这一讨论,亦望同行指正。一、右江沉积盆地的性质笔者认为,右江海西—印支期沉积盆地应主要归属于古特提斯构造域,具有被动型裂谷盆地的沉积、构造、成矿与岩浆活动特点。 1.古特提斯于泥盆纪初沿金沙江-红河断裂带开裂。我国著名地质学家王鸿祯教授将扬子地台以西、松潘、甘孜三角地带以及巴颜喀拉地带称为古特提斯。The study of sedimentation, tectonism and magmatism shows that the Hercynian-Indosinian Youjiang Basin may be ascribed to a passive rift basin which was controlled during its formation and evolution by the opening and closing of the palaeo-Tethys. The basin consists of several regional fault-related secondary NW-and NE-trending basins in which lithofacies and tectonic framework are quite variable in character. The NW-trending basins were formed largely by extensional faulting, whereas the NE-trending ones have the characteristics of the strike-slip basins. The following five stages have been distinguished for the evolution of the Youjiang Basin: (1) intracontinental rifting stage; (2) passive marginal rifting stage; (3) back-arc rifting stage; (4) strongly subsiding stage, and (5) filling-closing stage.

关 键 词：沉积盆地 盆地沉积 弧间盆地 裂谷盆地 特提斯构造域 构造格局 古特提斯 岩相 红河断裂带 裂谷带 

分 类 号：P642[天文地球—工程地质学]