江苏省东海县毛北金红石矿区中-北矿段矿体地质特征及成因初探  

Geological Characteristics and Genesis of the Ore-body in the Middle-North Section of Maobei Rutile Mining Area,Donghai County,Jiangsu Province

作　　者：刘跃青 洪连明 赵盛博 张凯[1] LIU Yue-qing;HONG Lian-ming;ZHAO Sheng-bo;ZHANG Kai(The Sixth Geological Brigade of Jiangsu Geology and Mining Bureau,Lianyungang,Jiangsu 222023)

机构地区：[1]江苏省地质矿产局第六地质大队,江苏连云港222023

出　　处：《四川地质学报》2023年第1期75-79,共5页Acta Geologica Sichuan

摘　　要：通过对矿区进行勘查工作,对矿床地质条件、控矿因素及成因进行总结研究。矿区位于苏北超高压变质带,岩浆活动强烈,基底地层为海州群变质岩系。本次工作共发现十条工业矿体,矿床赋存于榴辉岩中,成矿期后矿床受断层切割,使岩(矿)体不连续,走向及倾向发生明显变化。根据赋矿榴辉岩岩体结构构造不同分为块状榴辉岩及云母榴辉岩,前者较后者含矿性相对较好。金红石矿物颗粒主要呈浸染状分布于石榴子石、绿辉石等矿物粒间,矿石中金红石含量区间在1%~6%。榴辉岩的成因已有定论,经历了四个变质阶段,而对榴辉岩相峰期变质的温度及压力的认识观点不一,但不可否认的是本矿床属深成岩浆变质矿床。The geological conditions,ore-controlling factors and genesis of the deposit were summarised and studied through exploration work in the mine area.The mining area is located in the northern Jiangsu ultra-high pressure metamorphic belt,with strong magmatic activity and metamorphic rock series of Haizhou Group.A total of ten industrial ore bodies were found.The deposit was hosted in the gabbro,which was cut by faults after the mineralisation period,resulting in discontinuous rock(ore)bodies and significant changes in orientation and tendency.According to the texture and structure of the ore-bearing eclogite,it can be divided into massive eclogite and mica eclogite,and the former has better ore bearing than the latter.The rutile mineral grains are mainly distributed between the garnet and omphacite grains,with the rutile content in the ore ranging from 1%-6%.The origin of eclogite has been determined and it has undergone four stages of metamorphism.And there are differing views on the temperature and pressure of the metamorphic phase of the garnets,but it is undeniable that this deposit belongs to plutonic magmatic metamorphic deposit.

关 键 词：金红石 榴辉岩 成矿特征 东海县 超高压变质带 

分 类 号：P619.2[天文地球—矿床学]