Study on Slope Breaks in Large Down Warped Lake Basins and Its Significance——A case study from Jurassic lake in northwestern Junggar Basin
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摘要: 准噶尔盆地西北缘侏罗纪坳陷湖盆坡折带十分发育,具有断裂坡折带、挠曲坡折带、侵蚀坡折带和沉积坡折带等多种成因类型。坡折带在顺源方向具有多级特征,把坡折带按地理位置的差异分成盆缘坡折带和盆内坡折带。其中深部逆冲构造、继承性古隆起、盆内次级断层活动等构造运动是坡折带发育最主要的成因机制,坡折带发育规模与构造活动的大小、期次息息相关。由于构造在不同时期不同地域范围内其活动强度的差异,所形成的坡折带具有明显的多期、幕次性、差异活动以及继承与转化性等特征。同时坡折带在对地层超覆叠置、岩性纵向组合以及沉积体的纵横向展布上具有重要的控制作用,以此为基础建立了坡折带控制非构造圈闭的模式,对进一步寻找大规模的非构造圈闭或非构造圈闭群具有参考意义。Abstract: The slope breaks are developed widespread in Jurassic large down warped lake basin, the Northwestern Area, Junggar Basin. Their genetic types can be divided into fracture slope break, bending slope break, sedimentary slope break and erosional slope break. For their showing mutual grades characteristics along source area direction, they also can be divided into basin margin slope break and inner basin slope break according to their natural geographical positions.The genetic mechanism of the slope breaks includes deep seated thrust structure, inherited paleohigh and interior basin secondary fault,etc., and the scale of slope breaks intimately relates with the size and the period of tectogenesis. Because of the variance of tectonic activity in different period and district range, the slope breaks formed by tectonic have multi period, episode, differential motion, inherited and invert characteristics. The slope breaks obviously control the stratigraphic overlap, the longitudinal lithologic combination and the longitudinal and lateral distribution of depositional systems. So, we establish a reasonable pattern that the slope breaks control nonstructural traps and guide the regional exploration of nonstructural traps, which has the significance to further prospect for large scale nonstructural traps and traps group.
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Key words:
- Junggar Basin /
- down warped lake /
- slope break /
- nonstructural trap /
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