金沙江构造带是纵贯三江地区北段的一条十分显目而复杂的重要构造带。构造线由北往南,自北西走向转为近南北走向,略呈朝北东弯曲的弧形带。区域磁场图反映(费鼎, 1983),北起玉树经白玉、巴塘至得荣为一条巨大的线性排列变化异常带。它是三江地区内通过磁场特点反映出来的,最醒目、最规则的一条断裂构造带(图1). The Jinsha River structural belt is a very obvious and complex important tectonic belt running through the northern part of the Sanjiang area. The tectonic line goes from north to south and from northwest to near north-south, with a slightly curved arc toward the north east. Regional magnetic field map (Fei Ding, 1983), north of Yushu via white jade, Batang to Tak Wing as a huge linear arrangement of abnormal bands. It is the most prominent and most regular fault structure (Figure 1), which is reflected in the magnetic field in Sanjiang area.