摘要
多阶段地质构造过程和多重地球动力学背景,导致了山东省大地构造演化的复杂历程。自中太古代以来山东地区岩浆活动强烈,花岗岩类分布广泛、演化序列清楚、形成时代多样,为大地构造演化研究提供了重要的地质基础。本文研究了山东省新太古代、新元古代、三叠纪、白垩纪四个重要构造岩浆活动阶段末期花岗岩类的岩石组合、地质特征、地球化学特点、成因、物质来源和构造环境等,这些花岗岩均具A型花岗岩特征,发生于各地壳运动阶段末期,是指示山东地区和华北克拉通地壳演化及构造阶段转折的关键标志。其中,鲁西临沂四海山花岗岩类为A2型花岗岩,属太古宙微陆块陆-陆或弧-陆碰撞的后造山拉张环境花岗岩类;日照岚山头花岗质片麻岩早期为A2型花岗岩,晚期为A1型花岗岩,是与Rodinia超大陆裂解事件有关的新元古代非造山拉张环境花岗质片麻岩;威海石岛花岗岩类为A2型花岗岩,是三叠纪扬子板块与华北板块陆-陆碰撞的后造山拉张环境花岗岩类;青岛崂山花岗岩类和日照大店石英正长岩类由早期A2型和晚期A1型花岗岩组成,为非造山拉张环境的花岗岩类,是早白垩世克拉通破坏峰期后的重要标志。
Multi-stage geological tectonic process and multi-geodynamic background lead to the complex tectonic evolution in Shandong Province.Since the Middle Archean,the Shandong area has been characterized by strong magmatic activity,wide distribution of granites,clear evolutionary sequence and diverse formation ages,and is an important geological basis for studying the crustal evolution of the Shandong area.This paper studies the rock assemblage,geological characteristics,geochemical characteristics,genesis,material sources and tectonic setting of the Neoarchean,Neoproterozoic,Triassic and Cretaceous potassic granites in Shandong area.These granites are all A-type granites,which occurred at the end of each crustal movement stage,and are the key markers of crustal evolution and tectonic transition in Shandong area and North China Craton.Among them,the Neoarchean Sihaishan granitoid in Linyi is A2-type granite,which belong to the post-orogenic extensional environment granitoids of Archean microcontinent continental or arc-continent collision.Lanshantou granitic gneiss is A2-type granites in early stage and A1-type granites in late stage,which is a Neoproterozoic non-orogenic extensional granitic gneiss associated with the breakup of the Rodinia supercontinent.The Shidao granitoid in Weihai is A2-type granitoid in the post-orogenic extensional environment of the continental collision between the Yangtze plate and the North China Plate in the Triassic.The Cretaceous Laoshan granitoid in Qingdao and Dadian quartz syenite in Rizhao are composed of early A2-type and late A1-type granites,which are granites in non-orogenic extensional environment and are important markers after the peak stage of craton destruction.
作者
王斌
宋明春
周建波
丁正江
鲍中义
吕军阳
王珊珊
WANG Bin;SONG Ming-chun;ZHOU Jian-bo;DING Zheng-jiang;BAO Zhong-yi;Lü Jun-yang;WANG Shan-shan(Shandong Provincial No.6 Exploration Institute of Geology and Mineral Resources,Weihai Shandong 264209,China;College of Earth Sciences,Jilin University,Changchun 130061,China)
出处
《华北地质》
2022年第2期1-17,50,共18页
North China Geology
基金
国家自然科学基金项目“胶东深部金矿断裂控矿机理”(U2006201)。
关键词
山东省
A型花岗岩类
构造演化
拉张环境
Shandong province
potassic granite
A-type granitoid
tectonic evolution
