岩矿测试
巖礦測試
암광측시
ROCK AND MINERAL ANALYSIS
2014年
3期
353-358
,共6页
金伯利岩%尖晶石族矿物%化学成分%晶胞参数%矿物种类及指示意义
金伯利巖%尖晶石族礦物%化學成分%晶胞參數%礦物種類及指示意義
금백리암%첨정석족광물%화학성분%정포삼수%광물충류급지시의의
kimberlite%spinel group minerals%chemical composition%cell parameters%mineral classification and its implications
晶体矿物学理论认为不同成岩环境金伯利岩中尖晶石族矿物由于形成物理化学条件不同，其晶体结构和化学成分会发生明显的变化，通过对无矿、贫矿、富矿金伯利岩岩管中的尖晶石族矿物晶胞参数和化学成分的测定，研究尖晶石族矿物化学成分和晶胞参数变化与无矿、贫矿、富矿金伯利岩的内在关系，可以提高金伯利岩型金刚石矿床找矿效率。为了确定辽宁瓦房店金伯利岩中的尖晶石族矿物种属，探讨辽宁瓦房店金伯利岩中尖晶石族矿物化学成分和晶胞参数与金伯利岩含矿性关系，本文运用电子探针波谱仪对50件尖晶石族矿物中的MgO、FeO、TiO2、Al2 O3、MnO及Cr2 O3进行微区化学成分分析，运用单晶X射线衍射仪对136个尖晶石族矿物晶胞参数进行测定。数据统计显示：瓦房店金伯利岩中尖晶石族矿物为铬铁矿和镁铬铁矿，以化学分子式中A、B组主要阳离子占位特征为基础，可把矿区的尖晶石族矿物划分为10个亚种；如果用尖晶石族矿物化学成分中Cr2 O3与（ Cr2 O3+Al2 O3）含量的比值Cr′来表示尖晶石族矿物与金伯利岩含矿性的关系，金伯利岩岩体含矿性由富矿→中等含矿→贫矿，相应岩体中尖晶石族矿物Cr′值分别为89.5%、83.4%~87.1%和70.2%，逐渐变低；从无矿金伯利岩岩体→贫矿和中等含矿金伯利岩岩体→富矿金伯利岩岩体，金伯利岩体中第一世代尖晶石族矿物晶胞参数分别为0.831~0.832 nm、0.834~0.836 nm、﹥0.837 nm，有逐渐变大的趋势。本文认为，辽宁瓦房店金伯利岩中第一世代尖晶石族矿物晶胞参数大小和Cr′参数可以作为判断辽宁瓦房店金伯利岩含矿性的指示标型。
晶體礦物學理論認為不同成巖環境金伯利巖中尖晶石族礦物由于形成物理化學條件不同，其晶體結構和化學成分會髮生明顯的變化，通過對無礦、貧礦、富礦金伯利巖巖管中的尖晶石族礦物晶胞參數和化學成分的測定，研究尖晶石族礦物化學成分和晶胞參數變化與無礦、貧礦、富礦金伯利巖的內在關繫，可以提高金伯利巖型金剛石礦床找礦效率。為瞭確定遼寧瓦房店金伯利巖中的尖晶石族礦物種屬，探討遼寧瓦房店金伯利巖中尖晶石族礦物化學成分和晶胞參數與金伯利巖含礦性關繫，本文運用電子探針波譜儀對50件尖晶石族礦物中的MgO、FeO、TiO2、Al2 O3、MnO及Cr2 O3進行微區化學成分分析，運用單晶X射線衍射儀對136箇尖晶石族礦物晶胞參數進行測定。數據統計顯示：瓦房店金伯利巖中尖晶石族礦物為鉻鐵礦和鎂鉻鐵礦，以化學分子式中A、B組主要暘離子佔位特徵為基礎，可把礦區的尖晶石族礦物劃分為10箇亞種；如果用尖晶石族礦物化學成分中Cr2 O3與（ Cr2 O3+Al2 O3）含量的比值Cr′來錶示尖晶石族礦物與金伯利巖含礦性的關繫，金伯利巖巖體含礦性由富礦→中等含礦→貧礦，相應巖體中尖晶石族礦物Cr′值分彆為89.5%、83.4%~87.1%和70.2%，逐漸變低；從無礦金伯利巖巖體→貧礦和中等含礦金伯利巖巖體→富礦金伯利巖巖體，金伯利巖體中第一世代尖晶石族礦物晶胞參數分彆為0.831~0.832 nm、0.834~0.836 nm、﹥0.837 nm，有逐漸變大的趨勢。本文認為，遼寧瓦房店金伯利巖中第一世代尖晶石族礦物晶胞參數大小和Cr′參數可以作為判斷遼寧瓦房店金伯利巖含礦性的指示標型。
정체광물학이론인위불동성암배경금백리암중첨정석족광물유우형성물이화학조건불동，기정체결구화화학성분회발생명현적변화，통과대무광、빈광、부광금백리암암관중적첨정석족광물정포삼수화화학성분적측정，연구첨정석족광물화학성분화정포삼수변화여무광、빈광、부광금백리암적내재관계，가이제고금백리암형금강석광상조광효솔。위료학정료녕와방점금백리암중적첨정석족광물충속，탐토료녕와방점금백리암중첨정석족광물화학성분화정포삼수여금백리암함광성관계，본문운용전자탐침파보의대50건첨정석족광물중적MgO、FeO、TiO2、Al2 O3、MnO급Cr2 O3진행미구화학성분분석，운용단정X사선연사의대136개첨정석족광물정포삼수진행측정。수거통계현시：와방점금백리암중첨정석족광물위락철광화미락철광，이화학분자식중A、B조주요양리자점위특정위기출，가파광구적첨정석족광물화분위10개아충；여과용첨정석족광물화학성분중Cr2 O3여（ Cr2 O3+Al2 O3）함량적비치Cr′래표시첨정석족광물여금백리암함광성적관계，금백리암암체함광성유부광→중등함광→빈광，상응암체중첨정석족광물Cr′치분별위89.5%、83.4%~87.1%화70.2%，축점변저；종무광금백리암암체→빈광화중등함광금백리암암체→부광금백리암암체，금백리암체중제일세대첨정석족광물정포삼수분별위0.831~0.832 nm、0.834~0.836 nm、﹥0.837 nm，유축점변대적추세。본문인위，료녕와방점금백리암중제일세대첨정석족광물정포삼수대소화Cr′삼수가이작위판단료녕와방점금백리암함광성적지시표형。
According to crystal mineralogy theory,under the diagenetic environments with different physical and chemical conditions,crystal structure and chemical composition of spinel group minerals in kimberlite will be obviously different. Through the determination of the lattice parameters and chemical compositions of spinel group minerals from non-lean ore mines and Bonanza kimberlite pipe, the study of internal relations of chemical composition and lattice parameter changes in spinel group minerals among no ore,lean ore and bonanza kimberlite plays an important role for kimberlite diamond deposits prospecting. In order to determine the species of spinel group minerals,MgO,FeO,TiO2 ,Al2 O3 ,MnO and Cr2 O3 of 50 spinel group minerals were analyzed by using micro area chemical analysis with Electron Microprobe. The lattice parameters of 136 spinel group minerals were determined by single-crystal X-ray Diffraction. The results show that spinel group minerals in kimberlite Wafangdian of Liaoning province are magnesium-rich chromite. Based on the main cations occupying chemical formulae groups A and B,the spinel group minerals in mining can be divided into 10 subspecies. If the ratio of Cr2 O3/( Cr2 O3 +Al2 O3 )content( Cr′ values)in spinel group minerals represent the degree of mineralization of kimberlite ore-bearing deposit,the Cr′values in high-grade ore,medium-grade ore and lean ore of kimberlite rock in Wafangdian Liaoning are 89. 5%,83. 4% -87. 1% and 70. 2%,respectively. Lattice parameters of the spinel group minerals were 0. 831 -0. 832 nm,0. 834 -0. 836 nm and larger than 0. 837 nm from non-rock,lean ore rock,medium-grade ore and high-grade ore. A case that the spinel mineral lattice parameter of the first generation and Cr′value are the indicators of the ore bearing in Wafangdian kimberlite,Liaoning province is described.
