红河断裂的新观察

据越南马江下游地质观察，确定越南境内马江古生代地层特征和构造位置与中国云南东南部马关相一致，红河断裂的左行滑动最少达４００ｋｍ。哪将红河断裂两侧地质体位置复原，则右江三叠纪复理石将通过黑水河带与松潘－甘孜的巨型浊积岩盆地沟通，共同构成扬子陆块的被动边缘，黑水河带并不同板块缝合带，而是一个三叠纪的裂陷带。

NEW OBSERVATIONS OF THE RED RIVER FAULT

The Early Paleozoic sequence of the lower reaches of the Song Ma, Vietnam, is almost identical with that of the Pingbian-Maguan area, southeastern Yunnan. The sinistral displacement of the Red River fault reaches at least 400 km. If the displacement is removed, the Triassic flysch deposits of the Youjiang area would be connected with the huge Songpan-garze clastic basin by the Song Da zone. They combine to form the passive margin of the Yangtze Block. The Song Da zone is a Triassic rift belt, rather than a plate suture zone.