坦桑尼亚梅拉尼坦桑石矿床地质特征及成因模式
Geological characteristics and its genetic model of tanzanite deposit at Merelani,Tanzania
孙国锋 1张明云 2闫红圃 1张猛 2张伟杰 3LLOYD Shawarira4
作者信息
- 1. 河南省地质研究院,郑州 450001
- 2. 河南省第二地质勘查院有限公司,郑州 450046
- 3. 中金国检珠宝玉石质量检验中心有限公司,广东深圳 518020
- 4. 津巴布韦地质调查局,津巴布韦哈拉雷ZW192201
- 折叠
摘要
通过野外实地矿区地质填图,对坦桑尼亚梅拉尼坦桑石矿床的地质背景及矿区矿床地质特征进行详细描述,尤其对矿体及矿物宝石学特征进行了剖析和综述,探讨了宝石成因模式.认为坦桑石形成于约5亿年前的泛非运动,仅产于新元古代莫桑比克变质带的蚀变石墨片麻岩中,属于接触交代成因的矽卡岩矿床,主要受地层岩性和构造变形两个因素控制.
Abstract
Through the field geological mapping,the geological setting and its mineralization characteristics for tanzanite deposit at Merelani area,Tanzania are described in details,especially the occurrences of orebodies and characteristics of gemstone are analyzed and reviewed,further its genetic model is discussed preliminarily.It is considered that tanzanite has been formed in the altered graphite gneiss which distributed in the Neoproterozoic Mo-zambique metamorphic belt at proximately 500 Ma when the Pan-African movement was taken place.Being a skarn deposit related to the contact metasomatism,the lithostratigraphic and tectonic deformation are two main controlling factors.
关键词
矽卡岩/地质特征/坦桑石/成因模式/梅拉尼Key words
skarn/geological characteristics/tanzanite/genetic model/Merelani引用本文复制引用
基金项目
河南省地质研究院2023年度地质科技攻关项目(2023-903-XM007-KT03)
出版年
2024
NETL
NSTL
万方数据