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.

“”构造发育模式为：从晚侏罗世到白垩纪末发育的山间“”开始、发展到早第三纪断的发育、再演化为晚第三纪及第四纪发育阶段。