| 苏红图—银根盆地白垩纪沉积相与构造环境 |
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| 引用本文： | 李文厚,周立发.苏红图—银根盆地白垩纪沉积相与构造环境[J].地质科学,1997,32(3):387-396. |
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| 作者姓名： | 李文厚 周立发 |
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| 作者单位： | 西北大学地质系, 西安710069 |
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| 摘 要： | 对苏红图-银根盆地广泛发育白垩系陆相沉积的沉积相和构造环境的分析表明,盆地经历了从早白垩世退积型湖进层序到晚白垩世进积型湖退层序的沉积过程,其间发生过一次重要的地壳破裂事件,间隙式的火山喷发形成了大量火山岩。各种迹象表明,苏红图-银根盆地是典型的中新生代裂谷盆地。在此地质背景上,本区发育了一套良好的生储盖组合。
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| 关 键 词： | 白垩系 裂谷盆地 沉积相 扇三角洲相 深湖相 浊流沉积 |
| 收稿时间： | 1996-09-18 |
| 修稿时间： | 1996-09-18; |
SEDIMENTARY FACIES AND TECTONIC SETTING OF THE CRETACEOUS IN THE SUHONGTU-YINGEN BASIN |
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| Li Wenhou,Zhou Lifa.SEDIMENTARY FACIES AND TECTONIC SETTING OF THE CRETACEOUS IN THE SUHONGTU-YINGEN BASIN[J].Chinese Journal of Geology,1997,32(3):387-396. |
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| Authors: | Li Wenhou Zhou Lifa |
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| Institution: | Department of Geology, Northwest University, Xi'an 710069 |
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| Abstract: | Continental deposits of the Cretaceous are developed extensively in the Suhongtu-Yingen basin. The analyse of sedimentary facies and tectonic seetting shows that the basin underwent lake progression sequence of retrograding-type and lake retrograde sequence of progressive-type from Early Cretaceous to Late Cretaceou. An important crustal break event was occurred during that time. Intermittent volcanic eruption formed a large number of volcanic rock. Deposits of Lower Cretaceous are divided into three stages in the Suhongtu-Yingen basin: early of alluvial fan-fan delta stage that are made up of five sedimentary cycles that have gradually changed coarse sediment into fine-grained sediment from suface to superface, middle of shallow lake-deep lake stage that is developed sediment gravity flow, later of shallow lake and volcanic eruption that is developed a lot of intermediate and basic valcanic rock. Upper Cretaceous experiences two stages: early of piedmont river stage and later of shore shallow lake stage. In this region, fan delta that is outstanding characteristics is distributed in the side of boundary fault close neighbouring basin. Its sedimentary facies belt is developed completely. It is composed of fan-delta plain, fan-delta front and profan-delta. The fan-delta is retrograding ingress of lake water sequence whose lower member is coarse and upper member is fine in vertical direction. It has been shown that fall velocity of lake basin surpass sedimentary compensated velocity then. In this paper, the author advanced sedimentary model of Yingen rift basin by relationship among sedimentary feature of sedimentary facies, vertical sequence, geometric shape and plane spreading of sand body and basement fault. The author think that the geometric shape of the basin is mainly controlled by basement fault in the North-South region and the scope, development, sediment assemblage, two-dimensional distribution and plane spreading of the basin are also controlled by active fault. A variety of sign declare that Suhongtu-Yingen is a typical rift basin.of Mesozoic-Cenozoic era A set of good source-reservoir-cap rocks assemblages are developed in the region under this background. |
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| Keywords: | Cretaceous Rift basin Sedimentary fades Fan delta fades Deep lake facies Turbidity current deposits |
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