The basin tectonic model: it is intermont basin during late Jurassic to early Cretaceous, developed into faulted-lacustrine basin in Eogene, and evolved into depression in Neogene and Quaternary.

“盆地”构造发为：从晚侏罗世白垩纪末发的山间“盆地”开始、发展三纪断陷湖盆的发、再演化为晚三纪及四纪地陷发阶段。