不同类型层状硅酸盐宝玉石矿物的近红外光谱研究
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摘要
目前宝石红外光谱的研究主要集中在中红外波段,对近红外区间的研究相对较少。以层状硅酸盐宝玉石矿物为研究对象,测试分析了该类宝玉石矿物的近红外光谱特征,得出以下结果:1∶1型矿物Si-O基团伸缩振动倍频峰主要位于4600 cm~(-1)附近;2∶1型矿物Si-O基团伸缩振动倍频峰主要位于4500 cm~(-1)附近;而2∶1∶1型矿物由于Si-O基团与[OH]基团合频振动,峰值主要位于4400 cm~(-1)附近。高岭石、蛇纹石、滑石、叶腊石、绿泥石、葡萄石中H_2O弯曲和伸缩振动组合频位于5150 cm~(-1)附近。此类合频峰在层状硅酸盐宝玉石矿物的三种类型中均存在。羟基O-H伸缩振动的倍频位于滑石7223 cm~(-1)、叶蜡石7201 cm~(-1)处,这里主要存在于2∶1型的矿物中。
At present,the researches on the infrared spectra of gemstones mainly focus on the midinfrared band,and there are relatively few studies on the near-infrared range.The phyllosilicate gemstones minerals as the research object,the analysis of the type of gem mineral near-infrared spectroscopy characteristics making following results:the 1∶1 type mineral Si-O group stretching vibration octave peak is around 4600 cm~(-1).The stretching vibration frequency of Si-O group of 2∶1 type mineral is mainly around 4500 cm~(-1).but the 2∶1∶1 type minerals vibrate at a frequency of about 4400 cm~(-1)due to the combined frequency of Si-O groups and[OH]groups.The combined bending and stretching vibration frequencies of H_2O in kaolinite,ophiolite,talcum,pyrophyllite,chlorite,and prehnite are around 5150 cm~(-1).Such complex peaks exist in all three types of phyllosilicate gemstones minerals.The frequency-doubled frequency of the hydroxyl O-H stretching vibration is located at 7223 cm~(-1)of talc and7201 cm~(-1)of pyrophyllite,which is mainly present in the 2∶1 type minerals.
At present,the researches on the infrared spectra of gemstones mainly focus on the midinfrared band,and there are relatively few studies on the near-infrared range.The phyllosilicate gemstones minerals as the research object,the analysis of the type of gem mineral near-infrared spectroscopy characteristics making following results:the 1∶1 type mineral Si-O group stretching vibration octave peak is around 4600 cm~(-1).The stretching vibration frequency of Si-O group of 2∶1 type mineral is mainly around 4500 cm~(-1).but the 2∶1∶1 type minerals vibrate at a frequency of about 4400 cm~(-1)due to the combined frequency of Si-O groups and[OH]groups.The combined bending and stretching vibration frequencies of H_2O in kaolinite,ophiolite,talcum,pyrophyllite,chlorite,and prehnite are around 5150 cm~(-1).Such complex peaks exist in all three types of phyllosilicate gemstones minerals.The frequency-doubled frequency of the hydroxyl O-H stretching vibration is located at 7223 cm~(-1)of talc and7201 cm~(-1)of pyrophyllite,which is mainly present in the 2∶1 type minerals.
引文
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[2]Ndlovu B,Farrokhpay S,Bradshaw D.The effect of phyllosilicate minerals on mineral processing industry[J].International Journal of Mineral Processing,2013,125(3):149-156.
[3]Stack K M,Milliken R E.Modeling near-infrared reflectance spectra of clay and sulfate mixtures and implications for Mars[J].Icarus,2015,250(250):332-356.
[4]白立新.近红外矿物鉴定与分析研究[M].银川:宁夏工程技术,2007,6(4).334-338.
[5]修连存.近红外光谱仪测定岩石中蚀变矿物方法研究[M].南京:岩矿测试,2009:519-523.
[6]Cheng H,Hao R,Zhou Y,et al.Visible and near-infrared spectroscopic comparison of five phyllosilicate mineral samples[J].Spectrochimica Acta Part A Molecular&Biomolecular Spectroscopy,2017,180:19-22.
[7]孙海涛.BJKF-1便携式近红外矿物分析仪在宝玉石鉴定中的应用[M].银川:岩矿测试,2008:418-422.
[8]胡爱萍.采用便携式近红外矿物分析仪鉴别注胶翡翠[M].南京:宝石和宝石学杂志,2009,11(1):35-42.
[9]徐延婿.土河锦景德镇地区高岭石红外光谱分析[M].岩石矿物学杂志,2010,29(9):9-66.
[10]Lu L,Cai J,Frost R L.Desorption of stearic acid upon surfactant adsorbed montmorillonite[J].Journal of Thermal Analysis&Calorimetry,2010,100(1):141-144.
[11]Castellano M,Turturro A,Riani P,et al.Bulk and surface properties of commercial kaolins[J].Applied Clay Science,2010,48(3):446-454.
[12]Reddy B J,Frost R L,Dickfos M J.Characterisation of Ni silicate-bearing minerals by UV-vis-NIR spectroscopy:Effect of Ni substitution in hydrous Ni-Mg silicates[J].Spectrochimica Acta Part A Molecular&Biomolecular Spectroscopy,2009,71(5):1762-1768.
[13]Shankar V.Field characterization by near infrared(NIR)mineral identifiers-a new prospecting approach[J].Procedia Earth&Planetary Science,2015,11:198-203.
[14]Frost R L,Kloprogge J T,Ding Z.Near-infrared spectroscopic study of nontronites and ferruginous smectite[J].Spectrochimica Acta Part A Molecular&Biomolecular Spectroscopy,2002,58(8):1657-1668.
[15]陈廷芳,喻学惠.浙江青田石的岩石学特征及成因[J].现代地质,2011,25(3):522-530.
[16]翁诗甫.傅里叶变换红外光谱分析[M].北京:化学工业出版社,2010.