福建东山坑北复式岩体的地质特征及其变质变形作用  

On the Geologic Characteristics and the Metamorphic and Deformation of the Kengbei Complex Massif in Dongshan County, Fujian Province

作　　者：姜平[1] 

机构地区：[1]福建信息职业技术学院,福州350019

出　　处：《福建地质》2005年第1期25-32,共8页Geology of Fujian

摘　　要：在平潭—东山构造带南段深变质的东亚带和浅变质的西亚带的过渡带 ,出露一套变质变形特征极其复杂的动力变质岩系。其主体是一个由早侏罗世、晚侏罗世及晚侏罗世—早白垩世石英闪长岩、花岗闪长岩、二长花岗岩、正长花岗岩等组成的坑北复式岩体。该岩体可划分 6个基本单元 ,并与区域上同时代侵入岩的谱系单位划分进行对比 ,归并为东山序列、古美山、漳浦超单元。该区发育三期韧 - (脆 )性变形及动力变质作用。据 R1- R2图解及巴尔巴林岩浆构造分类 ,坑北复式岩体中各超单元 (单元 )侵入岩分别形成于不同的构造环境。A suit of dynamometamorphic rocks with extremely complicate metamorphism and deformation is distributed over the transitional belt between the eastern hypometamorphic subzone and western epimetamorphic subzone of the southern section of Pingtan-Dongshan tectonic belt. Their principal part is the Kengbei complex massif which is composed of Lower Jurassic, Late Jurassic and Late Jurassic-Lower Cretaceous quartzdiorite, granodiorite, adamellite and syenogranite. This rock body can be divided into six basic lithological units and is able to be contrasted with lithological lineage of cotemporary intrusive rock in area coverage. They can be grouped into Dongshan Sequence, Gumeishan Supper Unit and Zhangpu Supper Unit. Three stages of ductile(brittle)deformation and dynamic metamorphism are well distributed over the surveyed area. According to the R1-R2 diagrammatic drawing and the barbarin magmatic and structural classification, it is inferred that the different supper-unit intrusive rocks in the Kengbei complex massif form from the dissimilar tectonic setting for each.

关 键 词：复式岩体 变质变形作用 地质特征 福建 动力变质作用 晚侏罗世 石英闪长岩 花岗闪长岩 二长花岗岩 变质岩系 变形特征 早侏罗世 早白垩世 单位划分 构造环境 侵入岩 超单元 过渡带 构造带 岩浆 

分 类 号：P588.3[天文地球—岩石学]