摘要
本文将藏东三江构造带划分为三个陆块(由西往东为察隅陆块,昌都一思茅陆块,中咱陆块),二条结合带(即碧土一昌宁、孟连结合带,金沙江—哀牢山结合带),并对各构造带的地质和构造特征进行了系统的阐述,三江构造带演化的基本特点是:晚二叠世时期碧土洋盆向东、金沙江弧后盆地向西俯冲消减于昌都陆块之下;至早三叠世金沙江弧后盆地封闭,中咱陆块与江达弧相碰撞;中三叠世时碧土洋盆封闭,保山陆块与竹卡弧相碰撞;到晚侏罗世—老第三纪时期察隅陆块与保山陆块及澜沧江弧发生碰撞,从而形成了察隅及腾冲地区的燕山—喜马拉雅期花岗岩带。
In this paper the Sanjiang tectonic belt in eastern Tibet is dividedinto three continental blocks (which are the Zayu block, Qamdo-Simao block and Zongza block from west to east)and two junction zones (the Bitu-Changning and Menglian juntion zone and the Jinsha River-Ailao Mountains junction zone) and a systematic exposion is made about the geological and structural features of various tectonic units and the evolutionary stages of the tectonic belt. The basic features of the evolution of the belt are as follows: during the Late Permian the Bitu oceanic basin was subducted eastward and the Jinsha River back-arc basin was subducted beneath the Qamdo block; in the Early Triassic the Jinsha River back-arc basin was closed and the Zongza block collided with the Jomda arc; in the Late Jurassic-Paleogene, the Baoshan and Chuka blocks collided with the Lancang River arc, thus forming the Yanshanian-Himalayan granite belt in Zayu and Tengchong.
出处
《中国区域地质》
CSCD
1993年第2期140-148,共9页
Regional Geology of China
