| 楚雄前陆盆地的构造特征与沉积演化 |
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| 引用本文： | 谭富文,尹福光,许效松,陈明.楚雄前陆盆地的构造特征与沉积演化[J].大地构造与成矿学,2004,28(3):345-352. |
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| 作者姓名： | 谭富文 尹福光 许效松 陈明 |
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| 作者单位： | 成都地质矿产研究所,四川,成都,610082 |
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| 基金项目： | 中石化南方公司“楚雄盆地类比及油气分析 ( 2 0 0 3 )”项目资助 |
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| 摘 要： | 对楚雄前陆盆地西部及相邻构造格架进行了分析 ,认为原形盆地的西南部及相邻造山带受到了新生代红河断裂的强烈改造 ,而盆地西北部的盆 -山体系保留了盆地演化时期的基本格架。利用当代前陆盆地演化模式理论 ,对原形盆地的沉积特征及其与西部推覆构造的耦合关系进行了综合分析 ,认为扬子西部被动陆缘向楚雄前陆盆地转化的时期发生在晚三叠世卡尼早期 ,前陆盆地经历了 3个发展阶段 :卡尼期深水复理石沉积、诺利期浅水复理石沉积和瑞替期磨拉石沉积 ,并提出了相应的沉积 -构造演化模式。
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| 关 键 词： | 楚雄盆地 三叠纪 沉积层序 扬子地块 |
| 文章编号： | 1001-1552(2004)03-0345-08 |
| 修稿时间： | 2004年2月9日 |
RELATIONSHIP OF TECTONICS TO SEDIMENTARY EVOLUTION OF CHUXIONG FORELAND BASIN |
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| TAN Fuwen,YIN Fuguang,XU Xiaosong and CHENG Ming.RELATIONSHIP OF TECTONICS TO SEDIMENTARY EVOLUTION OF CHUXIONG FORELAND BASIN[J].Geotectonica et Metallogenia,2004,28(3):345-352. |
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| Authors: | TAN Fuwen YIN Fuguang XU Xiaosong and CHENG Ming |
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| Abstract: | Chuxiong basin, being a narrow body between Ailaoshan orogenic belt, Lijiang fold belt and Yangtze platform, and located on the Paleozoic passive-continental margin of western Yangtze platform, is a Triassic peripheral foreland basin. The southwest of the original basin and the adjacent thrust belt have been almost completely dismembered by Red-river Cenozoic fault. Firstly, based on the discussion of the relationship between Chuxiong foreland basin, Red-river fault, Ailaoshan orogenic belt and Lijiang fold belt, it is suggested that the original basin contains three tectonic units: western thrust belt, central depression and eastern rise belt. Lijiang fold belt was the same thrust system as its east adjacent thrust belt. They were thrust wedges propagating from west to east. So the western thrust belt is not an exotic block but a body intergrown with Chuxiong basin. Secondary, based on the sedimentary characteristics of Chuxiong basin, the Upper Triassic strata can be divided into four second-order sequences. The isochronous surfaces between the sequences can be regionally traced, showing that the sediments are successive from the east to west of the basin. The wedge-top sediments contain four sequences in the western thrust belt, three sequences in the central depression, and two sequences in the eastern rise belt on the margins of the basin, which shows that the deposition was propagating from west to east. At last, based on the evolution model for foreland basin, the relationship of the sedimentary characteristics of Chuxiong foreland basin with its western thrust belt is discussed. It suggests that the time when the passive continental margin basin in western Yangtze plate was changed into Chuxiong foreland basin was Camian of Late Trassic. The evolution of Chuxiong foreland basin can be divided into three phases: the deep-water sedimentary phase of flysch in Camian, the shallow-water sedimentary phase of flysch in Norian, and the sedimentary phase of molasses in Rhaetian. Also, the corresponding evolution model of sedimentation to tectonics is described in this paper. |
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| Keywords: | Chuxiong basin Triassic Sedimentary sequence Yangtze block |
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