岩矿测试2025，Vol.44Issue(6)：1131-1144,14.DOI:10.15898/j.ykcs.202503260059
青海断层山绿松石矿物学和谱学特征研究
Mineralogical and Spectroscopic Characteristics of Turquoise from Duancengshan,Qinghai Province
摘要
Abstract
The Duancengshan turquoise mine in Qinghai is an ancient mining site discovered in the northwestern region.Situated in the central distribution zone of Chinese turquoise resources and adjacent to the Tang-Xizang Ancient Road,this mining area holds significant importance for constructing China's turquoise resource database,investigating ancient turquoise material provenance,and studying material-cultural exchanges across the Qinghai-Xizang Plateau.Polarized light microscopy,Raman spectroscopy,infrared spectroscopy,X-ray powder diffraction,scanning electron microscopy,automated mineral quantitative analysis systems,and electron probe microanalysis were employed to systematically investigate the spectral characteristics,surface micromorphology,mineral composition,and chemical constituents of turquoise samples.Through a comprehensive analysis of fundamental mineralogical features,this research aimed to identify the provenance characteristics of the Duancengshan turquoise.Results indicate that the Duancengshan turquoise primarily consists of microcrystalline aggregates exhibiting well-crystallized forms including small flakes,short columns,platy sheets,and spherulites.Associated gangue minerals comprise quartz,hematite,anorthite,biotite,muscovite,schorl,apatite,and barite.Major chemical components include Al2O3(21.97%-35.00%),CuO(5.21%-7.67%),and FeOT(2.70%-9.35%),with a negative correlation between Al2O3 and FeOT concentrations,while CuO shows no significant correlation with FeOT.This suggests a predominant isomorphic substitution of Fe3+for Al3+.Comparative analysis with turquoise from central China's Henan-Shaanxi-Hubei region,Ma'anshan(Anhui),Xinjiang,as well as international sources including Iran,Sonora(Mexico),and Arizona(USA)reveals that Raman and infrared spectral features of Duancengshan turquoise lack distinctive markers for provenance identification.However,the characteristic mineral assemblage(turquoise+quartz+hematite+mica+anorthite+schorl),coupled with the absence or scarcity of malachite and kaolinite-group minerals,along with elevated FeOT content attributed to local iron mineralization,establishes diagnostic criteria.Particularly,the presence of schorl combined with mineralogical associations and geochemical signatures is a key indicator for distinguishing Duancengshan turquoise provenance.关键词
绿松石/光谱学/矿物学/矿业遗址/断层山Key words
turquoise/spectroscopy/mineralogy/ancient mining site/Duancengshan分类
天文与地球科学引用本文复制引用
王雪利,梁云,艾昊,谭宇辰,先怡衡..青海断层山绿松石矿物学和谱学特征研究[J].岩矿测试,2025,44(6):1131-1144,14.基金项目
国家社会科学基金项目(22BKG009) （22BKG009）
国家社科重大基金项目子课题(22&ZD243) （22&ZD243）
国家科学技术部科基础资源调查专项(2022FY101503) （2022FY101503）
