吉林南部地区老岭群变质作用特征研究  

A Study of Metamorphic Characteristics of Laoling Group in Southern Jilin Province

作　　者：邢树文[1] 李军[2] 马玉波[1] 孙永杰[2] 李孝文 李宏茂[2] 张增杰[1] 

机构地区：[1]中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室,北京100037 [2]吉林省地质调查院,吉林长春130061 [3]吉林省通化地质矿产勘查开发研究院,吉林通化134001

出　　处：《地球学报》2011年第3期269-278,共10页Acta Geoscientica Sinica

基　　金：中国地质调查局地质调查工作项目"中国东北部陆缘金;有色金属多期成矿作用和勘查选区研究"(编号:1212010012006)资助

摘　　要：吉林南部地区老岭群变质矿物较为发育,本文通过对其中发育的变质矿物进行详细鉴定和大量探针分析,将老岭群下亚群主要变质矿物划分为两个世代,分别代表两期变质作用M1和M2。结合研究区老岭群变质矿物组合、分布特征以及变质相带的研究,认为M1为中-低温区域动力热流变质作用,可以划分为低绿片岩相和高绿片岩相,而M2为局部热变质作用,可以划分为低绿片岩相、高绿片岩相及低角闪岩相。综合研究认为吉南地区老岭群下亚群变质作用由早到晚,范围逐渐缩小,强度逐渐降低的特点,反映出了该地区古元古代地壳由活动向稳定转化的趋势。Metamorphic minerals are widely developed in Laoling Group of southern Jilin Province. Based on a detailed analysis of the metamorphic minerals in rock samples, the authors hold that the main minerals in lower sub-group of Laoling Group can be divided into two generations： M1 and M2, which represent two metamorphic stages. Researches on metamorphic assemblage, distribution characteristics and division of metamorphic facies show that M1 is characterized by low-to-moderate temperature regional dynamic heat flow metamorphism which can be divided into two metamorphic facies： lower greenschist facies and high greenschist facies. By contrast, M2 is represented by local thermal metamorphism which can be divided into three metamorphic facies： lower greenschist facies, high greenschist facies and lower amphibolitic facies. Comprehensive studies show that metamorphism of the sub-group of Laoling Group in southern Jilin Province is characterized by reduction of influencing area and decrease of intensity from early to late. This tendency suggests hat the earth＇s crust became stable in Paleo Proterozoic.

关 键 词：老岭群 变质作用特征 吉林南部 

分 类 号：P534.3[天文地球—古生物学与地层学] P588.34[天文地球—地质学]