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本文着重根据火山岩的主量元素、稀土元素和微量元素特征厘定了我国西南“三江”地区昌宁－孟连带Ｃ１—Ｐ２火山岩和南澜沧江带Ｐ—Ｔ３火山岩的构造－岩浆类型。昌宁－孟连火山岩带为洋脊／准洋脊型－洋岛型玄武岩、蛇绿混杂岩带，代表澜沧江洋或古特提斯的残迹；南澜沧江火山岩带是一个陆缘火山弧带，是澜沧江洋盆向东俯冲消减、碰撞以及陆内俯冲过程的产物。两带火山岩是成对分布的古特提斯缝合带的产物。
Based on the characteristics of major elements, rare earth elements and trace elements in volcanic rocks, this paper focuses on the tectono-magmatic types of the Chang-Meng associated C1-P2 volcanic rocks and the Pangshen-P-T3 volcanic rocks in the “Sanjiang” region of southwestern China. The Changning-Menglian volcanic belt is a ridge / quasi-ridge-type oceanic basaltic and ophiolitic melange belt, representing the remnant of the Lancang Ocean or the ancient Tethyan. The southern Lancang River volcanic belt is a continental margin volcanic arc belt, Is the product of the subduction, collision and intracontinental subduction processes of the Lancang Ocean basin to the east. The two volcanic rocks are the product of paired ancient Tethys suture.