胶东地区中生代花岗岩划分  

Division of Mesozoic Granites in Jiaodong Area

作　　者：王来明[1] 任天龙[1] 刘汉栋[1] 宁振国[1] 于晓卫[1] 郭瑞朋[1] 侯建华[1] 朱学强[1] WANG Laiming;REN Tianlong;LIU Handong;NING Zhenguo;YU Xiaowei;GUO Ruipeng;HOU Jianhua;ZHU Xueqiang(Shandong Institute of Geological Surveying, Shandong Ji'nan 250013, China)

机构地区：[1]山东省地质调查院,山东济南250013

出　　处：《山东国土资源》2021年第8期1-14,共14页Shandong Land and Resources

基　　金：山东地勘基金项目胶东地区中生代花岗岩调查及与金矿关系研究(鲁勘字(2018)19号);山东省莱州-招远金矿整装勘查区综合研究(鲁勘字(2014)7号)联合资助。

摘　　要：胶东地区是山东省中生代花岗岩最发育、最典型的地区,并与金矿关系密切。花岗岩的划分主要依赖20世纪80—90年代开展的1∶5万区域地质调查工作,由于完成单位众多,完成时间不同,不同图幅对侵入岩的划分有别,因此对花岗岩的划分并不统一。本课题首次按“时代+岩浆事件+岩性”的划分方法对中生代花岗岩进行了详细划分。将胶东区域性广泛分布、具有成因联系、岩性相同、形成时代相同的花岗岩划分为同一期岩浆事件的产物,岩浆事件名称为期,是时代单位“世”以下区域性岩浆活动事件单位,共划分为晚侏罗世玲珑期(146~166 Ma)、早白垩世早期郭家岭期(123~135 Ma)、早白垩世晚期伟德山期(110~123 Ma)和崂山期(108~120 Ma),其中玲珑期为地壳重熔型花岗岩,郭家岭期、伟德山期为壳幔混合型花岗岩,崂山期为A型花岗岩。对于局限分布、特殊岩性的花岗岩称之为独立岩体,按“时代+岩性”的方法进行划分,划分为4个独立岩体:分别为晚三叠世宁津所岩体、晚三叠世槎山岩体、晚侏罗世垛崮山岩体、晚侏罗世文登岩体。胶东地区中生代构造岩浆演化反映了中国东部中生代构造体制转换过程,即由扬子板块和华北板块SN向挤压EW向伸展,到太平洋板块和欧亚板块NW向挤压NE方向伸展的转换过程。Jiaodong area is the most developed and typical area of Mesozoic granite in Shandong province,which is closely related to gold deposits.The division of granite mainly depends on regional geological survey with the scale of 1∶50000 carried out in 1980s to 1990s.Due to many completion units,different completion times and different map sheets,the division of intrusive rocks is different,so the division of granite is not unified.In this paper,Mesozoic granites are divided in detail according to the division method of"age+magmatic event+lithology"for the first time.The granites widely distributed in Jiaodong area,with genetic connection,the same lithology and the same formation age are divided into the products of the same magmatic event.The magmatic event is named as the regional magmatic activity event unit below the"epoch",which is divided into Linglong period of late Jurassic(146~166Ma),Guojialing period of early Cretaceous(123~135Ms)Weideshan period(110~123Ma)and Laoshan period(108~120Ma)in late period of early Cretaceous.Linglong period is crustal remelting granite,Guojialing period and Weideshan period are crust mantle mixed granite,and Laoshan stage is A type granite.Granite with limited distribution and special lithology is called independent rock mass.According to the method of"age+lithology",it is divided into four independent rock masses,they are Ningjinsuo rock mass of late Triassic,Chashan rock mass of late Triassic,Duogushan rock mass of late Jurassic and Wendeng rock mass of late Jurassic.The Mesozoic tectonomagmatic evolution in Jiaodong area reflects the transformation process of Mesozoic tectonic system in eastern China.It is the transformation process of SN compression to EW extension of Yangtze plate,and NW compression of North China plate to NE extension of Pacific plate and Eurasian plate.

关 键 词：花岗岩 中生代 划分 胶东 

分 类 号：P544[天文地球—构造地质学]