摘要
根据阿尔金山西段前早古生代变质岩的岩石组成、沉积建造、变形变质作用改造历史、岩石地球化学特征等研究,将阿尔金碰撞造山带西段划分为3个构造单元:北阿尔金地块、中阿尔金地块(包括英格里克构造-蛇绿混杂岩带、肖鲁克·布拉克高压变质岩带和塔什萨依玉石矿高绿片岩相—低角闪岩相变质岩带)和南阿尔金地块(包括南阿尔金中—新元古界隆起带和阿尔金南缘复合构造-蛇绿混杂岩带)。提出该碰撞造山带经历了前长城纪古陆核形成阶段、长城纪—青白口纪不同基底联合阶段和早古生代洋陆转换阶段3个阶段的构造演化。
According to the composition, sedimentary formations, history of deformation and metamorphism and petrochemistry and geochemistry of pre-Paleozoic metamorphic rocks in the western segment of the Altyn Tagh Mountains, the western segment of the Altyn Tagh collisional orogen may be divided into three tectonic units:from north to south they are the northern Altyn Tagh block, the central Altyn Tagh block (including the Yinggelike tectonic-ophiolitic mélange belt, Xiaoluke Bulak high-pressure metamorphic belt and high greenschist-low amphibolite facies metamorphic belt of the Taxsay jade mine) and the southern Altyn Tagh block (including the Meso- and Neoproterozoic southern Altyn Tagh uplift and southern Altyn Tagh marginal tectonic-ophiolitic mélange belt). Three stages are proposed for the tectonic evolution of the pre-Early Paleozoic Altyn Tagh coUisional orogen:the stage of pre-Changchengian paleocondnental nucleus formation, stage of combination of Changchengian-Qinghaikouan different basement units and stage of Early Paleozoic ocean-land transition.
出处
《地质通报》
CAS
CSCD
北大核心
2006年第1期104-112,共9页
Geological Bulletin of China
基金
中国地质调查局<新疆1:25万瓦石峡幅
阿尔金山幅区域地质调查>项目(编号19991300008091)成果。
关键词
阿尔金山
前早古生代变质岩
碰撞造山带
构造演化
Altyn Tagh
pre-Early Paleozoic metamorphic rocks
collisional orogen
tectonic evolution