摘要
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。
The present paper deals with volcanic rocks of the Changning-Menglian belt (C 1-P 2) and the south Lancangjiang belt (P 1-T 3) in 'Sanjiang' region, Southwest China. Based On geological and petrological characteristics of these volcanic rocks, the authors studied their major elements, REE and trace element and, furthermore, determined their tectonomagmatic types. Volcanic rocks along the Changning-Menglian belt are basalts and ophiolite complex of oceanic ridge paraoceanic ridge type, which represent remnants of the Lancangjiang ocean. The South Lancangjiang volcanic belt is a composite volcanic arc resulting from eastward subducting and collision of the Lancangjiang ocean. The two volcanic belts, distributed in pairs, are products of the Lancangjiang oceanic suture zone.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
1998年第4期296-307,共12页
Acta Petrologica et Mineralogica
关键词
火山岩
地球化学
缝合带
南澜沧江
late Paleozoic and Triassic volcanic rocks
tectonomagmatic type
Southwestern Yunnan
