| 丹池晚古生代盆地的沉积和构造演化* |
| |
| 引用本文： | 陈洪德,李孝全.丹池晚古生代盆地的沉积和构造演化*[J].沉积学报,1989,7(4):85-96. |
| |
| 作者姓名： | 陈洪德 李孝全 |
| |
| 作者单位： | 1.成都地质学院沉积研究所; |
| |
| 基金项目： | 国家自然科学基金资助项目 |
| |
| 摘 要： | 丹池盆地属右江裂谷带靠近江南古陆南缘的次级裂陷盆地，其中的沉积可分为五个相区，十三种相类型。研究认为丹池盆地的形成、沉积作用、相和相序的分布均明显受到同沉积期断裂活动的影响。构造演化从泥盆纪初开始即有北西向丹池断裂的张裂作用，此种张裂与其派生的北北东向走滑断裂的复合作用，到二叠纪时，演变为北西向断裂的走滑活动，丹池盆地最初由半地堑式发展为地堑式盆地，到二叠纪成为-走滑盆地。
|
| 关 键 词： | 沉积盆地 岩相古地理 同沉积断裂活动 |
| 收稿时间： | 1989-03-13 |
EVOLUTION OF THE SEDIMENTATION AND TECTONICS OF LATE PALEOZOIC DANCHI BASIN |
| |
| Institution: | 1.Chengdu College of Geology;2.The Regional Survey Brigade of Guangxi |
| |
| Abstract: | The Danchi Basin belongs to the secondary rift basin of Youjiang Rift Belt near the Jiangnan Oldland.The sedimentary fades can be divided into five fades area and thirteen facies belts, including dellaic, shoreline ， tidal Hat, lagoonal clastic shelf, carbonate-clastic shelf, Restricted platformal, open platforraal, bioherm, platform-marginal slope, platform-shelf and basinal sediments.The main characteristics of the sedimentary facies are listed in table 4.The gross tendency of sedimentation is that terrigenous elastics are deposited near the margin of the oldland, and carbonates and silicalites are deposited far from the oldland, and mixed deposites consisting of carbonates and elastics are favourable in the transitional area. During the Devonian to Permian, the clastic deposits decrease with the carbonates increasing. The formation of the basin, sedimentation and distribution of facies and sequences in the area are controlled by the activities of synsedimentary faultings.The main characteristics of which are as follows: 1) The facies belts extend in the trend of the faults. The rifting forms linear depressional belts, and strike-slipping causes local rises and depressions, and the facies zones are distributed in "S" or "counter-S" type. 2) The bioherms were distributed in linear along the margin of platforms which is controlled by the activities of synsedimentary faults. They are asymmetrical on the profiles, and the reef-front talus occurs usually on the side near the faults. 3) There are special sedimentary types. When the linear depressional zones caused by the activities of the faults strentch to the margin of the oldland,- they often are as some passageways along which a large quantity of terrigenous elastics is transported into the basin, so that the very thick turbidite fans are formed.The activities of the faults on the transitional belts betwwen the platform and basin can cause so steep slopes that the large- scale debris flow deposition, turbidite deposition, slump and collapse accumulations occurred in the belts. 4) There are some distinctive syndepositional deformative structures, for example, extensive syndepositional slump folds, pillow sedimentary bodis and convolute layers, one of whose main characteristics is that they are limited in some layers. 5) The isopach strike is closely relative to the extension of the synsedimentary faults. 6) The activities of synsedimentary faults usually cause the suddenly change of facies. The evolution of the activities of the synsedimentary faults are from startion with the rifting of the faults with NW- trend, through the NW trend extensional fracturing in coupling faults with NNE trend strike-sliping, and finally, finishing with the NW strike-ship faulting.On the profile, the evolution of the Danchi Basin is characterized in form of a semi-graben to graben type. |
| |
| Keywords: | |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
