Discovery of Ophiolitic Mélange in the North Region of Geji County, Northwest Tibet and Its Zircon U-Pb Age

Objective The Bangong Co–Nujiang River suture zone is the great boundary between the Lhasa and Qiangtang terranes in the Tibetan Plateau.A series of major scientific issues are still controversial at present such as the subduction polarity and evolutionary process of this suture（Wei Shaogang et al.,2017）.

析楚亡汉兴的行政区划原因

实行不同的行政区划制度是导致楚亡汉兴的重要因素。落后于时代的分封制,是项羽功败垂成的重要原因之一;同样的道理,刘邦实行了适合社会实际情况的郡国制,尽可能地团结了不同阶层的人,不但取得了与项羽斗争的胜利,也为西汉的兴旺、发展提供了制度上的保障。