松潘—甘孜地体印支期岩浆侵入和构造变形的研究现状与进展  

Present status and progress in the study of Indosinian plutons and tectonic deformations in the Songpan-Garzêarea

作　　者：刘洋 滕飞 郭硕 LIU Yang;TENG Fei;GUO Shuo(Tianjin Center(North China Geological Science and Technology Innovation Center),China Geological Survey,Tianjin 300170,China)

机构地区：[1]中国地质调查局天津地质调查中心(华北地质科技创新中心),天津300170

出　　处：《华北地质》2025年第1期1-10,共10页North China Geology

基　　金：中国地质调查项目“黄河下游重点生态区生态地质调查”(DD20230462);“华北陆块北缘成矿带区域地质调查”(DD20240027)。

摘　　要：【研究目的】印支运动期间,伴随着华南、华北和羌塘地体的碰撞汇聚,在松潘—甘孜地区引发了广泛的花岗质岩浆侵入和褶皱变形,为此需研究其形成大地构造背景与演化过程。【研究方法】本文根据花岗质侵入岩的矿物组成和地球化学特征,将其划分为4种主要类型。【研究结果】黑云母±角闪石高钾钙碱性型、过铝质钙碱性型、高钾碱性型和淡色花岗岩型。根据宏观、微观构造和区域不整合特征,这一时期的构造变形可以主要划分为D1和D2期。【结论】不同时期不同类型的花岗质侵入体和构造形变分别对应于造山期和后造山期的不同生成环境。[Objective]During the Indosinian orogeny,the collision and convergence of the South China,North China,and Qiangtang terranes triggered extensive granitic magmatic intrusions and fold deformation in the Songpan-Garzêregion.To investigate their tectonic setting and evolutionary processes.[Methods]the authors analyzed the mineral compositions and geochemical characteristics of granitic intrusions.[Results]Four main types of granitic intrusions were identified:(1)biotite±amphibole high-K calc-alkaline type,(2)peraluminous calc-alkaline type;(3)high-K alkaline type;(4)leucogranite type.Based on macro-and micro-structural features and regional unconformities,the tectonic deformation during this period was divided into two principal phases:D1 and D2.[Conclusions]The diverse types of granitic intrusions and structural deformations from different stages correspond to distinct tectonic environments during the syn-orogenic(collisional)and post-orogenic(extension)phases of the Indosinian orogeny.

关 键 词：印支运动 松潘—甘孜 花岗质侵入体 构造变形 后造山期 

分 类 号：P542[天文地球—构造地质学] P588[天文地球—地质学]