华东地质2025，Vol.46Issue(1)：68-78,11.DOI:10.16788/j.hddz.32-1865/P.2024.21.014
安徽怀宁地区象山石墨矿床的晶质石墨矿物学特征研究
Study on the mineralogical characteristics of crystalline graphite from Xiangshan graphite deposit in Huaining County,Anhui Province
摘要
Abstract
In this paper,the researchers have employed a variety of analytical testing methods and research techniques to conduct the first study on the crystalline graphite mineralogical characteristics of Xiangshan graphite deposit in Huaining County,Anhui Province.The crystalline graphite of the Xiangshan deposit has a rel-atively complete crystal form and appears as flake aggregates.Energy spectrum analysis shows that the content of C atom in the crystalline graphite ranges from 91.99%to 92.74%.Laser Raman spectroscopy shows that graphite has a high degree of crystallinity and an orderly complete carbon atomic structure.Its laser Raman characteristic spectrum lacks D1 and D2 peaks,similar to the Raman spectroscopy in graphene.Powder X-ray diffraction(XRD)reveals that the crystalline graphite exhibits characteristics of 2H type graphite,with an axis length a=0.246 1～0.246 6 nm,c=0.669 3～0.670 0 nm,and a unit cell volume V=0.035 1～0.035 29 nm3.The thickness of graphite flake varies from 37.1～43.3 nm,the degree of graphitization 82～96,the estimated metamorphic tem-perature 542.4～587.2℃,the content of 3R polymorphism 9.03%～10.37%and δ13C value-29.223‰～-26.926‰.These findings all suggest that the graphite carbon derived from bio-organic carbon deposited in the strata,which is closer to the level of peat and modern organic matter.Besides,there is no evidence of carbon-con-taining fluid brought in by magma and inorganic carbon resulting from carbonate rock decomposition.关键词
安徽怀宁地区/象山石墨矿床/晶质石墨/矿物学特征Key words
Huaining County,Anhui Province/Xiangshan graphite deposit/crystalline graphite/mineralogi-cal characteristics分类
地质学引用本文复制引用
李小东,李勇..安徽怀宁地区象山石墨矿床的晶质石墨矿物学特征研究[J].华东地质,2025,46(1):68-78,11.基金项目
安徽省公益性地质工作"宣城地区晶质石墨矿调查评价(编号:2022-g-1-6)"项目资助. （编号:2022-g-1-6）
