岩石矿物学杂志2024，Vol.43Issue(3)：630-642,13.DOI:10.20086/j.cnki.yskw.2024.0311
黑青和田玉宝石矿物学及地球化学特征研究
Gem mineralogical and geochemical characteristics of the black cyan nephrite
摘要
Abstract
In recent years,a kind of black cyan nephrite containing pyrite has appeared in the domestic market.It is mainly produced in Xinjiang and belongs to a relatively rare nephrite variety,which has mining and utilization value.This article systematically analyzed the mineralogical and geochemical characteristics of seven samples using conventional gemological instruments,polarized light microscopy,infrared spectroscopy,Raman spectroscopy,X-ray powder diffraction(XRD),electron probe(EPMA)laser inductively coupled plasma mass spectrometry(LA-ICP-MS),and isotope mass spectrometer(MC-ICP-MS).The results show that the color of black cyan neph-rite is dark green to black,the refractive index is 1.61,the relative density is 3.08～3.17,and the Mohs hardness is 6.0～6.5.The main component mineral is tremolite,the secondary mineral is mainly pyrite,and a small amount of chlorite,epidote,sphene,zircon,and graphite are also contained,with a typical fiber interlaced struc-ture;The characteristic peaks of infrared and Raman spectra are consistent with the standard peaks of nephrite;The main chemical components of the sample are SiO2,MgO,CaO and FeO.The Mg/(Mg+Fe2+)value indicates that some tremolite has transitioned to actinolite.Based on the trace element Cr-Ni mapping,the sample is identified as a dolomite marble type genesis,while the content of rare earth elements is relatively low,in a left leaning mode,The ore-forming hydrothermal fluid is mainly magmatic water,containing a small amount of metamorphic water.The sample contains pyrite with Co/Ni＞1 and small amounts of As,Se,Cu,Zn and Pb,δ34Sranges from 8.87％o to 20.92％o,suggesting that it is of magmatic-hydrothermal origin and the source of sulfur is a mixture of magma and formation sulfur.关键词
黑青和田玉/黄铁矿/宝石矿物学/氢-氧-硫同位素Key words
black cyan nephrite/pyrite/gemology and mineralogy/hydrogen-oxygen-sulfur isotope分类
天文与地球科学引用本文复制引用
付玉蕾,史淼,曹沁元,马世玉..黑青和田玉宝石矿物学及地球化学特征研究[J].岩石矿物学杂志,2024,43(3):630-642,13.基金项目
National Natural Science Foundation of China(42002156) （42002156）
Natural Science Foundation of Hebei Provincial(D2021403015) （D2021403015）
Science and Technology Project of Hebei Education Department(QN2021027) （QN2021027）
National Pre-research Project of Hebei Geology University(KY2024YB01) 国家自然科学基金项目(42002156) （KY2024YB01）
河北省自然科学基金项目(D2021403015) （D2021403015）
河北省高等学校科学技术研究项目(QN2021027) （QN2021027）
河北地质大学国家预研项目(KY2024YB01) （KY2024YB01）
