苏北超高压变质带榴辉岩型金红石矿床及其成因  

Rutile Deposit in Eclogite of Ultra?high Pressure Metamorphic Belt in the Northeast of Jiangsu Province and Ore Genesis

作　　者：黄建平[1] 马东升[1] 刘聪[1] 王辉[2] 

机构地区：[1]南京大学内生金属矿床成矿机制研究国家重点实验室,南京210093 [2]江苏省地质调查研究院,南京210018

出　　处：《南京大学学报（自然科学版）》2002年第4期514-524,共11页Journal of Nanjing University（Natural Science）

基　　金：国家攀登计划预选项目 (95 -预 - 93) ;国家地质大调查项目 (2 0 0 0 10 30 0 10 4 )

摘　　要：在苏鲁超高压变质带南部数千个榴辉岩体中 ,已发现了 4 0个含金红石榴辉岩体 ,金红石储量达数百万吨 .在综述、分析该带榴辉岩的空间分布、岩石矿物学、含矿性等特征的基础上 ,确定了块状榴辉岩型和片麻状榴辉岩型两种主要矿石类型 .金红石在矿石中主要呈包裹体、粒间充填、蚀变残余和热液充填四种赋存形式 ,分别代表了四个不同的形成阶段 .电子探针分析显示 ,在高压、超高压变质作用期间 ,富含Na的深部流体对金红石的成矿可能起了重要的作用 .该矿床属典型的榴辉岩型金红石矿床 ,在成因上与超高压变质作用有关 ,类似于挪威的Engeb fjellet、俄罗斯的Shubino村和意大利的PianPaludo矿床 。There are thousands of eclogite bodies with different sizes in the ultra_high pressure metamorphic belt in the northeast of Jiangsu province, among which 40 rutile_bearing eclogite bodies have been discovered. This paper summarizes and analyzes the spatial distribution, petrology and mineralogy of the eclogites, and the characteristics of rutile mineralizing. There are several types of rutile_bearing eclogite and most of them are massive and muscovitized and the massive eclogite is the most important ore type. Four stages of rutile mineralization in the eclogites can be recognized by various ore textures, mineral paragenesis and rutile occurrences (inclusion, intergranular infilling, replacement remnant, or hydrothermal infilling). The electronic microprobe analysis shows that a Na_rich liquid during high and ultra_high pressure metamorphism probably plays an important role in rutile mineralization. The typical eclogite_type rutile deposit is related to ultra_high pressure metamorphism in genesis, similar to those at Engebfjellet of Norway, Shubino Village of Russia, and Pian Paludo of Italy, and different from the other important types in China.

关 键 词：超高压变质带 榴辉岩 矿床成因 矿石类型 包裹体 粒间充填 苏北 金红石矿床 

分 类 号：P578.47[天文地球—矿物学]