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白垩纪,在西藏南部地质历史上,是一个重要的阶段,发生了剧烈的火山喷发、岩浆侵入以及褶皱运动。沿雅鲁藏布江一线,以大规模的超基性岩带为标志,又是一条重要的地质界线,被称为“断块缝合线”或“板块缝合线”,近年来受到广泛的重视。在超基性岩带两侧,拉孜—江孜一带,最广泛发育的是白垩纪地层,厚度巨大,岩相极其复杂,而且含有可采煤层。因此,对这一带白垩系的研究,具有重要的经济价值和理论意义。
The Cretaceous, in the geological history of southern Tibet, is an important stage where dramatic volcanic eruptions, magmatic intrusions and folds have occurred. Along the Yarlung Zangbo River, marked by a large-scale ultrabasic rock belt, it is also an important geologic boundary. It is called “fault block suture” or “plate suture” and has received extensive attention in recent years. On both sides of the ultrabasic belt, the most extensively developed area of the Latti-Gyantse is the Cretaceous formation, which is extremely thick with extremely complex lithofacies and contains recoverable seams. Therefore, this study of the Cretaceous has important economic value and theoretical significance.