准噶尔盆地中部不存在中生代古隆起

中、上侏罗统在准噶尔盆地中部的三个泉-莫索湾-沙门子一带缺层严重, 多年来一直被认为是剥蚀所致, 是一个“古隆起”。这种认识与实际资料多有矛盾: 现今并无隆起形态, 南缘下沉“古隆起”演化为单斜难以成立; 没有隆起剥蚀形迹资料, 与上覆白垩系的沉积特征毫不相干; 与沉积相成果也不一致。相反, 钻井对比等资料证明, 中、晚侏罗世有一个高水位期和水进期的演化过程, 盆地中部由于古地势较低, 因未填平补齐而缺层, 未曾有过隆起剥蚀。“古隆起”并不存在。

Mesozoic Paleo-Uplift Not Occurred in Center of Junggar Basin

Since the Middle-Upper Jurassic in Sangequan-Mosuowan-Shamenzi belt in center of Junggar basin is almost missing, people had been thinking that it was a "paleo-uplift" caused by erosion. This paper argues that such an idea contradicts with the real conditions, for uplift shape and erosion or denudation are not found in available information, which is also in inconsistency to the sedimentary feature of overlying Cretaceous and the sedimentary facies in this area. In contrast, the correlation results based on drilling data indicate that in Middle and Late Jurassic there exists a high water-level stage or water-invaded stage during evolution process. And in the incomplete strata caused by insufficient filling not appear uplift and erosion, the "paleo-uplift" does not occur in the center of Junggar basin.