地质通报Issue(1)：171-182,12.
腾冲-冈底斯新生代造山带的垮塌及陆间裂谷的形成
The collapse of Tengchong-Gangdise Cenozoic orogenic belt and the formation of intercontinental rift:Petrological records of Pliocene-Pleistocene dacite in Tengchong
摘要
Abstract
The study of Cenozoic intermediate-acidic volcanic rocks in Tengchong has been very insufficient in the past. Based on geochemical studies of intermediate-acidic volcanic rocks, the authors divided the Cenozoic volcanic rocks into Sr-high, Yb-low Adak-type dacite and Sr-low, Yb-medium Zhe-Min (Zhejiang-Fujian) type dacite, with the time limit being N 2(2.78~4.04Ma) and Q1(0.73~1.19Ma)respectively. These intermediate-acidic volcanic rocks were formed during the transform process from stable⁃ness to collapse after the orogenic uplift of the Tengchong- Gangdise belt. In Miocene, the stress of Tengchong-Gangdise plateau was transformed from the domination of EW-trending compression to NS-trending strike-slip, and the orogenic belt began break⁃up. Blocked by the Luxi-Baoshan land mass, the direction of the strike-slip was deflected and resulted in the detachment and forma⁃tion of rift basin among axial fault slices at the turning end in the early period of the formation of rift, the mantle was decompressed and intruded upward, and the high-pressure part of the lower crust was partly melted to form Adak-ype granitic magma. In early Pleistocene, with the intensification of the rifting, the crust became further thinner, and the lower crust was partly melted under the condition of low pressure to form Zhe-Min type granitic magma.关键词
腾冲/上新世-更新世/英安岩/埃达克型/浙闽型/造山带垮塌/陆间裂谷Key words
Tengchong/Pliocene-Pleistocene/dacite/adak-type/Zhe-Min type/orogenic collapse/continental rift分类
天文与地球科学引用本文复制引用
张虎,吴中海,叶培盛,陈光艳,田素梅,姚雪..腾冲-冈底斯新生代造山带的垮塌及陆间裂谷的形成[J].地质通报,2015,(1):171-182,12.基金项目
中国地质科学院项目（编号:1212011120166）、中国地质调查局项目 （）
