Formation Process of Bohu Depression of Yanqi Basin and Its Dynamic Mechanism
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摘要: 在综合分析区域地质、构造、沉积等资料的基础上, 结合中国西北地区中生代构造背景、火成岩分布特征、平衡剖面的研究和热史方面的研究成果, 以及参照碎屑矿物系数的时空展布特征, 证实了早中侏罗世的西北地区处在2次构造运动(印支运动和燕山运动) 强烈挤压与碰撞(即羌塘块体和拉萨块体分别向北拼贴于欧亚板块南缘) 之间的相对松弛的弱伸展环境中, 焉耆盆地侏罗系原型性质为拉张背景下的坳陷盆地; 并在此基础上探讨了焉耆侏罗系盆地的形成机制以及后期构造作用对其进一步的改造, 其构造格局最终定型为具有前陆盆地的结构特征, 从而建立了其充填演化序列.Abstract: On the basis of the integrated analysis of the regional geology, tectonic and deposition data, combined with the achievements of the predecessor and the tectonic setting of Northwest China in the Mesozoic, and the research on the distribution feature of igneous rocks, balanced cross section, geothermal history, clastic mineral coefficients, this paper proves that in the Early-Middle Jurassic, the Northwest China formd in a comparatively weak outspread environments between the intensive collision and extrusion of two tectonic movements (Indosinian movement and Yanshan movement).The formation and transformation mechanism of the Yanqi basin in the Jurassic is also discussed.The structure framework was determined as forland basin type and the filled sequence was built.
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图 1 焉耆盆地构造分区及井位图(据河南油田研究院)
Fig. 1. The structure partition and the position of wells in Yanqi basin
图 2 额济纳旗盆地与民和盆地侏罗纪拉张环境示意图(靳久强等, 1999)
Fig. 2. Diagram showing extensive background of Minhe and Ejinaqi basins (Jurassic)
图 3 焉耆盆地侏罗系碎屑矿物成熟度指数等值线及古流向图(刘林玉, 2003)
(a) 八道湾组; (b) 三工河组; (c) 西山窑组
Fig. 3. The maturity isoline of detrital minerals and the map of paleocurrent (Jurassic) in Yanqi basin
图 5 焉耆盆地结构特征(类前陆盆地)
Fig. 5. The structure feature of Yanqi basin (foreland-like basin)
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