| 中国西北地区侏罗纪原型盆地与演化特征 |
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| 引用本文： | 靳久强,孟庆仟.中国西北地区侏罗纪原型盆地与演化特征[J].地质论评,1999,45(1):92-104. |
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| 作者姓名： | 靳久强 孟庆仟 |
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| 作者单位： | [1]中国石油天然气总公司石油勘探开发研究院 [2]中国科学院地球物理研究所 |
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| 摘 要： | 西北地区各板块于古生代末－三叠纪初连为一体，形成了造山带围绕稳定地块的构造格局，为侏罗纪盆地的发生发展奠定了基础。早－中株罗世时，西北地区整体上处于伸展构造环境，它是南方特提斯洋板块两次俯冲挤压运动之间应力松弛的产物，西北地区的侏罗纪盆地经历了两期盆地类型的发育和叠加，中株罗世西山窑结束时的中燕山运动是盆地类型的转型期，早期为伸展型断兀盆地，晚期为挤压型坳陷盆地，根据盆地的力学性质，几何形态，大地
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| 关 键 词： | 侏罗纪 原型盆地 断陷盆地 拉分盆地 盆地演化 |
Proto-Types and Evolution of Jurassic Basins in NW China |
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| Jin Jiuqiang,Zhao Wenzhi,Xue Liangqing.Proto-Types and Evolution of Jurassic Basins in NW China[J].Geological Review,1999,45(1):92-104. |
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| Authors: | Jin Jiuqiang Zhao Wenzhi Xue Liangqing |
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| Abstract: | At the end of the Paleozoic or the beginning of the Triassic, the plates in northwestern China coalesced to form the tectonic framework of stable massifs surrounded by orogenic belts, which provided the basement for the origination and development of basins in the Jurassic. During the Early-Middle Jurassic, the whole of NW China was in an extensional tectonic environment, which resulted from the stress relaxation between two northward subductions of the Tethys Ocean plate in the south. The Jurassic basin in NW China experienced the development and superimposition of two types of basins. The middle Yanshanian orogeny at the end of the Xishanyaoan Period of the Middle Jurassic was the transformation time of basin types, during which the extensional rift basins in the early stage changed into the compressed downwarped basins in the late stage. According to the mechanical features, geometric configuration, tectonic location, basement characteristics, and depositional evolution of basins, the Early-Middle Jurassic basins can be classified into four types: paracratonic (rift) basin, intermont and rift basin, piedmont rift basin and shear pull-apart basin. Correspondingly, the Middle-Late Jurassic basins in the compressional setting can also be divided into four types: paracratonic (downwarped) basin, intermontane downwarped basin, piedmont downwarped basin and com-presso-shear basin. The formation mechanism of the Jurassic proto-basins in NW China can be attributed to the combination of two crustal movements in vertical and lateral directions. The basin evolution shows close relationship to orogenic belts. The evolution of basins inside or outside the Tianshan Mountains mainly reflects the vertical movement produced by the isostatic adjustment of the lithosphere, while the movement style of the Altun fracture zone, which was mainly derived from the lateral plate movement, exerted influence on the basins on the sides and at the ends of the zone. |
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| Keywords: | Jurassic proto-basin paracratonic basin rift basin pull-apart basin north-western China |
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