高校地质学报2017，Vol.23Issue(3)：417-430,14.DOI:10.16108/j.issn1006-7493.2016203
江苏冶山矽卡岩型硼矿成因机制研究:来自硼酸盐矿物学制约
Formation Mechanism of the Yeshan Skarn-type Boron Deposit, Nanjing, Jiangsu Province: Constraints from Borate Minerals
摘要
Abstract
The Yeshan skarn-type boron deposit,located in Nanjing,Jiangsu Province,is one of the most representative boron deposits in China.In this paper,we studied mineral assemblage,petrographic textures,and chemical compositions of borate minerals and associated gangue minerals from this boron deposit,and discussed possible formation mechanisms of this boron deposit.The ore minerals in Yeshan boron deposit are ludwigite and szaibelyite.Ludwigite occurs in the early skarn stages as fibrous or needle-like aggregates.Szaibelyite occurs mainly as flakes and fibers.Four types of the szaibelyite have been distinguished:(1) Amorphous szaibelyite-Ⅰ,usually associated with serpentine;(2) Net-like szaibelyite-Ⅱ,cross-cutting or surrounding early flake-like szaibelyite-Ⅰ;(3) Szaibelyite-Ⅲ,which forms banded texture with fine-grained magnetite;and (4) Interstitial szaibelyite-Ⅳ,which fills the interstitial regions between other phases.We suggest that net-like szaibelyite-Ⅱ and earlier flake-like szaibelyite-Ⅰ could have formed by the interaction between B-rich hydrothermal fluid and brucite.Szaibelyite-Ⅲ could have formed by the interaction between B-rich fluid and earlier ludwigite.Interstitial szaibelyite-Ⅳ could have directly precipitated from the late-stage B-rich fluids.关键词
硼镁石/硼镁铁矿/冶山/矽卡岩型硼矿床Key words
szaibelyite/ludwigite/Yeshan/skarn-type boron deposit分类
天文与地球科学引用本文复制引用
孙浅,赵明,张文兰..江苏冶山矽卡岩型硼矿成因机制研究:来自硼酸盐矿物学制约[J].高校地质学报,2017,23(3):417-430,14.基金项目
国地资源部公益性行业科研专项项目(2010011005-4)资助 （2010011005-4）
