摘要
华南泥盆纪是在加里东运动之后,从地槽转化为地台,扬子板块和华夏板块联为一体,形成统一的华南板块的基础上接受沉积的。作为加里东构造面上第一个沉积盖层的泥盆纪陆源碎屑岩,广泛分布于滇、黔、桂、川、湘、赣、闽、粤等地,受古陆边缘断裂,特别是走滑和拉张断裂的影响,以及古地理格局的控制,其厚度大,沉积类型丰富。根据岩石组合、结构构造、沉积序列、古生物组合以及遗迹化石种类等基本原则,将华南泥盆纪陆源碎屑岩划分为大陆、海陆交互和浅海3大环境,7个相区,以及冲积扇、河流、湖盆等14种相类型,和20多个亚相。系统阐述了各种沉积相的分布规律和沉积特征,为研究华南泥盆纪扬子海盆的发展和演化提供了丰富的资料。
After Caledonian orogeny,the geosyncline of South China was changed into platform,the South China plate was formed by the conjunction of Yangtze plate and Cathaysia plate. The Devonian system in South China was formed on the above united plate. As the first sedimentary cover above Caledonian structural plane,the Devonian terrigenous clastic rocks with large thickness and abundant sedimentary types are widespreadly distributed in Yunnan, Guizhou, Guangxi, Sichuan, Hunan, Jiangxi, Fujiang and Guangdong provinces, and are influenced by the faults of old land margins, especially the strike-slip faults and extension faults,and are controlled by paleogeographical pattern. According to rock association .texture,structure,sedimentary sequence,paleobiological assemblage and the kind of trace fossils,the Devonian terrigenous clastic rocks in South China are divided into three kinds of environments such as continent, transition and shall marine with sevenfacies areas and fourteem facies such as alluvial fan , river, lake basin,lake delta, river-controlled delta, tide-controlled delta, river-mouth bay, coastal plain, barrier clastic coast, mixed-deposit coast, clastic shelf and mixed-deposit shelf, and more thar twenty subfacies. The authors also expound the regulars and sedimentary characteristics of above facies, and provide abundant information for studying the development and evolution of Devonian Yangtze marine basin in South China.
