| 华南地区加里东期前陆盆地演化过程中的沉积响应 |
| 点此下载全文 |
| 引用本文：尹福光,许效松,万方,陈明.2001.华南地区加里东期前陆盆地演化过程中的沉积响应[J].地球学报,22(5):425-428. |
| DOI： |
| 摘要点击次数: 2536 |
| 全文下载次数: 2442 |
|
|
| 中文摘要:华南地区从震旦纪至早古生界经历了从洋盆的形成、直至转换成前陆盆地的过程。被动大陆边缘阶段，在扬子陆块的东南边缘构成了2次从碎屑岩陆架到碳酸盐台地的沉积序列，一次为震旦纪；另一次为寒武纪至早奥陶世。从中奥陶世至志留纪末，华南洋关闭、形成前陆盆地系统。它由前陆推覆体、前陆前渊、前陆隆起和隆后盆地4部分组成。前陆推覆体细分为根带、中带、前锋带。随着推覆体的上叠式的逆冲，形成外前渊盆地（钦防一带）和内前渊盆地（湘西、黔东南）。当前陆推覆体向克拉通推进时，前陆隆起也逐渐向后退。此带表现出一个海平面相对上升的过程，形成碳酸盐缓坡。随着推覆体进一步逆冲，前缘隆起继续隆升，且露出水面，使其后的隆后盆地转变为半局限环境。晚志留世末，前陆盆地回返，海水从东向西逐渐退出扬子大陆。 |
| 中文关键词:华南地区 加里东期 前陆盆地 沉积响应 |
| |
| The Sedimentary Response to the Evolutionary Process of Caledonian Foreland Basin System in South China |
|
|
| Abstract:The sedimentary environment and the tectonic evolution of the cover were more or less affected by the Caledonian tectonic movement. The foreland basin is made up of four tectonic units, namely, thrust, foreland basin, bulge and back-bulge basin. The thrust can be divided into three belts, viz., front belt, middle belt, and root belt. The two stages of Caledonian evolution in South China are Sinian and Early Ordovician rift-passive continental margin subsidence phase and Ordovician and Silurian foreland basin phase. There are two sedimentary sequences from clastic shelf to carbonate platform in the rift-passive continental margin, and the first sequence includes turbid in the fore deep belt, the shale in the back-bulge basin and carbonate in the fore bulge. The fore deep and bulge shifted westwards and towards the platform with the evolution of the basin. The eastern thrust belt is considered to be a typical wedge-top outer fore deep, and the inner fore deep basin belt went through a sedimentary process of the prograding foreland-basin system. The back-bulge basin was formed when early fore deep deposits were subducted beneath the eastern thrust belt and bulge uplift. This shows the control of tectonic setting over the evolution of the basin. |
| keywords:South China Caledonian period foreland basin sedimentary response |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|
