| 云南思茅三叠纪弧后前陆盆地的沉积特征 |
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| 引用本文： | 谭富文.云南思茅三叠纪弧后前陆盆地的沉积特征[J].沉积学报,2002,20(4):560-567. |
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| 作者姓名： | 谭富文 |
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| 作者单位： | 国土资源部成都地质矿产研究所 成都 610082 |
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| 基金项目： | 中国石油天然汽集团公司资助项目,, |
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| 摘 要： | 思茅盆地位于古特提斯构造域的东段,西侧为澜沧江造山带,东侧为哀牢山造山带.三叠纪沉积盆地建立在晚古生代褶皱基底之上,形成于古特提斯洋闭合后,造山早期的弧陆碰撞阶段.前人提出过后陆盆地、滞后型弧后盆地、裂谷盆地和前陆盆地等多种认识.本文通过对盆地形成的地球动力学背景及盆地内沉积体的性质、结构、时空叠置关系、古流向、特殊沉积体的时空展布及其所表现出的盆地沉降中心的迁移规律等方面的系统研究,认为思茅三叠纪盆地属弧后前陆盆地,其演化阶段始于中三叠统安尼期以前,盆地主要受控于澜沧江造山带,晚三叠世晚期受哀牢山造山带影响,具有复合式前陆盆地特点,三叠纪末过渡为陆内拗陷盆地。
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| 关 键 词： | 特提斯 思茅盆地 前陆盆地 三叠纪 |
| 文章编号： | 1000-0550(2002)04-0560-08 |
| 收稿时间： | 2001-11-05 |
| 修稿时间： | 2001年11月5日 |
The Sedimentary Characteristics of Simao Triassic Rear Arc Foreland Basin, Yunnan Province |
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| TAN Fu,wen.The Sedimentary Characteristics of Simao Triassic Rear Arc Foreland Basin, Yunnan Province[J].Acta Sedimentologica Sinica,2002,20(4):560-567. |
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| Authors: | TAN Fu wen |
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| Institution: | Chengdu Institute of Geology and Mineral Resources,Chengdu 610082 |
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| Abstract: | Simao basin locates in East part of Paleo Tethys tectonic zone. To its west is Lancangjiang orogenic belt and east is Ailao shan orogenic belt. Based on the late Paleozoic fold basement, Simao Triassic sedimentary basin formed in the early continental island arc colliusion stage after the close of Paleo Tethys ocean. Lots of viewpoints have been given to interpret its property, such as rear land basin, "delayed" back arc basin, rift basin and foreland basin. In this paper, the authors argue, on the basis of the study of the texture, property, stacking pattern, the provenance (or paleo current directions) of the deposits, the earth dynamics of the basin and the transfer mode of the basin center, that Simao Triassic basin was a rear arc foreland basin. Its development started before Anisian of Middle Triassic and controlled mainly by Lancangjiang orogenic belt. In Late Triassic, effected by Ailao shan orogenic belt, the basin had the properties of complex foreland basin. At the end of Triassic, it transformed into an intracontinental downwarped basin. |
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| Keywords: | Tethys Simao basin foreland basin Triassic |
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