聚丙烯酸盐/绢云母超吸水性复合材料的表征

通过丙烯酸与绢云母超细粉的接技共聚，制备出吸水率为1100倍的超吸水性复合材料。通过X—射线、傅立叶红外光谱、热分析、偏光显微镜等对样品进行表正和分析。结果表明，丙烯酸与绢云母在接技共聚过程中绢云母的结构没有发生变化，但分散度提高；绢云母粉体OH基团与丙烯酸COO基团发生了某种形式的键合或结合，形成了一种网络结构；复合材料的脱水温度提高，表明与水分子的结合能力增强。     

辽宁小佟家堡子金矿床成矿时代探讨

小佟家堡子金矿床位于辽东金矿集中区,为产于古元古代变质岩系中的微细粒浸染型金矿,矿床类型独特。文章采用了绢云母^40Ar/^39Ar法对样品从450℃进行了8个阶段的加热分析。从绢云母石英交代岩型金矿石中挑选出与金矿化密切共生的绢云母单矿物,通过^40Ar/^39Ar快中子活化阶段加热法获得坪年龄为167Ma。绢云母^40Ar/^39Ar法测年结果与矿床的控矿构造特征、区域岩浆活动的演化规律相吻合,进一步证明了该金矿床为燕山期成矿。同时,绢云母^40Ar/^39Ar的马鞍形年龄谱还表明,在绢云母石英交代岩形成过程中,可捕获部分“过剩剩氩”,这可能是造成K－Ar法年龄值高、范围较大的原因之一。     

绢云母表面改性的实验研究

采用超音速气流粉碎方法对绢云母进行超细粉碎，通过控制进口压力、工作压力和进料速度可生产出不同粒度、径厚比的绢云母超细粉(鳞片)；采用硅烷偶联剂对超细绢云母进行表面化学改性，并利用红外光谱和扫描电镜比较不同改性方法的改性效果；实验结果表明，有机溶剂法的改性效果优于干法，从而制备出应用性能和价值得到较大提高的改性绢云母超细粉。     

滁州绢云母矿物中铁赋存状态的研究

绢云母中含铁量多少是影响产品品质，特别是白度的重要因素，对滁州产出的绢云母的显微结构、化学组成、谱学特征、Fc含量分配等一系列特征进行了分析研究，结果表明，矿物中大部分Fc存在于二八面体中，并且得出其含量分配系数。研究结果对绢云母的具体加工和生产有指导作用。     

安徽滁州李集—三合集地区绢云母矿床地质特征及成矿模式

皖东滁州张八岭地区具有丰富的绢云母矿产资源,近年来陆续发现并探明多处绢云母矿床,是我国重要的绢云母矿产地。文章基于对安徽滁州李集—三合集一带1∶50 000区域矿产地质调查,结合前人资料,论述了该区绢云母矿床的区域地质背景、矿床地质特征、矿床成因及成矿控制因素,建立了绢云母矿床区域成矿模式。研究认为该区绢云母矿床受青白口纪西冷岩组地层控制,西冷岩组原岩为一套海相喷发的火山岩夹陆源碎屑岩,属细碧—石英角斑岩—碎屑岩建造,经低绿片岩相变质变形后形成不同类型的绢云母片岩。该绢云母矿床的成因为火山沉积变质矿床,印支期是西冷岩组变质变形的主构造期,为绢云母矿床的主成矿期。     

福建硬质绢云母表面化学改性的研究

采用超细粉碎和表面化学改性方法对硬质绢云母进行改性，研究表面改性的机理，建立了一整套的改性工艺，制备出应用性能和价值得到较大提高的改性硬质绢云母超细粉。     

航空高光谱识别的高、中、低铝绢云母矿物成因学研究

国内外学者在航空高光谱矿物填图时,根据Al-OH光谱特征吸收波长位置不同将浅色云母类矿物分为2~3类,分别命名为高铝绢云母、中铝绢云母、低铝绢云母,但对它们的成因特点却只有零星的讨论,没有比较系统的有针对性的研究。本文在新疆雪米斯坦铀多金属成矿带获取CASI/SASI航空高光谱数据,并开展矿物填图的基础上,针对高铝绢云母、中铝绢云母、低铝绢云母等三种矿物的成因学专门开展了比较系统的研究。采用的方法主要是在开展详细的野外地质观察、采样的基础上,对采集的上述三类矿物蚀变岩样品进行详细的室内光谱测量、Al-OH吸收波长位置统计、显微薄片观察、全岩X衍射分析、粘土X衍射分析等研究,并结流体成矿理论和已有矿物成因学知识,进行了详细深入的分析讨论。研究表明,高铝绢云母蚀变岩蚀变强烈,云母类蚀变矿物以绢云母、伊利石为主,且主要与叶腊石和微晶石英等矿物伴生,而低铝绢云母蚀变岩蚀变强度中等,以伊利石、伊蒙混层为主,绿泥石增加,主要与方解石、浊沸石等矿物伴生;高铝绢云母蚀变岩具有相对高的石英含量和粘土矿物总量,具有相对较低的钾长石、斜长石以及方解石含量;低铝绢云母蚀变岩则具有相对较低的石英和粘土含量,具有相对较高的斜长石、钾长石和方解石含量。通过深入分析讨论,本文提出了在研究区航空高光谱识别的高铝绢云母形成于相对高温、偏酸性的热液流体环境,低铝形成于相对低温、偏碱性的热液流体环境。这一新认识对航空高光谱遥感矿物填图结果的深入应用和深层次找矿信息反演具有重要意义。     

尾矿中绢云母回收试验研究

经对尾矿中绢云母试验研究，确定尾矿中回收绢云母的工艺采用先粗选后浮选的方法，同时加入捕收剂BK，抑制剂B—1和B—2，使绢云母的纯度达到98％，尾矿中绢云母产出率为6％。     

基于短波红外技术的蚀变矿物特征及勘查模型——以斯弄多银铅锌矿床为例

印度-亚洲大陆的碰撞成就了青藏高原的冈底斯成矿带,位于该成矿带的斯弄多银铅锌矿床赋存于林子宗群火山岩中,经过勘查确认该矿床属于低硫化浅成低温热液型矿床。通过对5个钻孔进行短波红外测量,发现钻孔中的蚀变矿物主要有绢(白)云母、钠云母(富Na云母)、伊利石和蒙脱石,并在垂向形成绢(白)云母→绢(白)云母+钠云母+蒙脱石+伊利石→绢(白)云母+伊利石→绢(白)云母的组合特征。通过总结归纳蚀变矿物分布、分带特征并与地质编录相结合,构建了基于短波红外技术的斯弄多找矿勘查模型。笔者在数据分析与模型构建中发现:(1)伊利石-蒙脱石混合矿物组成是寻找深部及外围矿体的重要线索;(2)绢(白)云母属于成矿前期的蚀变,与矿体之间的关系不明显;(3)矿床深部表现为两种不同的化学反应:SW方向深部反映了绢云母被交代形成伊利石的过程;NE方向深部表现为绢(白)云母二八面体结构的变化;(4)未被剥蚀的青磐岩化带是寻找浅成低温热液型金矿的主要依据。     

云南墨江金厂金矿床含铬层状硅酸盐矿物成分标型特征

含铬绢云母类矿物在云南墨江金厂金矿床中广泛出现于黄铁铬绢英岩、黄铁硅质岩、黄铁铬云母岩和石英脉中。含铬绿泥石类矿物主要出现在石英脉、硅质岩、黄铁铬绢英岩中。蒙脱石出现于蚀变围岩中，而高岭石出现于富金石英脉中。本文通过对72个上述矿物电子探针数据的分析，确定了与其成因产状对应的含铬绢云母、含铬伊利石、含铬绿泥石、含铬蒙脱石、高岭石矿物的系列成分标型。研究表明，具最高铬含量的上述矿物样品均位于近金厂岩体穿脉的最北端。在铬铝云母SiO2-Cr2O3关系图上可以看出，不同成矿背景的铬铝绢云母，其Cr、Si离子数有分区特点，而本矿床的铬铝云母成分标型反映其富硅富铬的特点，与金厂超基性岩体的变质热液有关。     

田黄的X射线衍射研究

用X射线衍射分析的方法测定了12个田黄样品,其中,青田石1个,寿山石9个,昌化田黄石2个。确定青田石由叶蜡石(58%)、绢云母(36.1%)和高岭石(5.9%)组成;昌化田黄石由迪开石组成;寿山石分别由迪开石、高岭石、叶蜡石及绢云母组成。     

ASTER spectral analysis for alteration minerals associated with gold mineralization

This study presents classifications of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery based on spectral analysis of alteration minerals associated with gold mineralization in Abo Marawat area which is located in the Central Eastern Desert of Egypt. Spectral analysis of continuum removed reference spectra of alteration minerals alunite, kaolinite, sericite, and calcite from USGS and JPL spectral libraries show shifts in position, shape, and strength most probably related to changes in sample purity and particle size of analyzed samples. Spectral Information Divergence (SID) classification method proved successful for mapping sericite, calcite, and clay minerals. Spectral Angle Mapper (SAM) classification identified only sericite and calcite alteration minerals. The identified alteration zones are coincidence with the field sampling and geological map of the study area. The microscopic examination of samples collected from the quartz veins and hydrothermally altered wall-rocks from near surface and subsurface at Abu Marawat gold mine shows sericitization, argillaceous, and carbonatization alteration zones. Gold occurs as very fine inclusions in pyrite, chalcopyrite, and sphalerite and also found filling the fractures between chalcopyrite grains. This study concludes that ASTER image classifications using reference spectra are a stable and reproducible technique for mapping gold related hydrothermal alteration zones in areas with no dominant vegetation cover.     

应用X射线衍射-扫描电镜-光学显微镜鉴定黑龙江石墨尾矿中的绢云母

石墨尾矿作为一类二次资源,当云母类矿物的含量在10%以上时,具有回收利用价值。黑龙江某地石墨尾矿中含有10%以上的云母类矿物,但其细度(500~800目)低于常规的云母矿,本文采用X射线衍射(XRD)分析矿物组成,再结合化学分析、扫描电镜-能谱、光学显微镜与纯矿物进行对比,由此鉴定云母类矿物种属。XRD研究初步表明石墨尾矿含有的云母族矿物属于白云母亚类或黑云母亚类。扫描电镜分析表明尾矿中的云母矿物与纯绢云母矿物均以片状和鳞片状为主要存在形态,而纯黑云母主要以片状形式存在。尾矿的Si O2含量为5%~13%,Al2O3含量为4%~8%,与纯绢云母接近。光学显微镜鉴定显示在正交偏光下石墨尾矿中的云母颜色和纯绢云母类似,而与纯黑云母截然不同。综合以上结果最终可确定该地石墨尾矿中的云母族矿物为白云母亚类中的绢云母。本研究为后续石墨尾矿的选矿工艺奠定了基础,也可应用于类似细度绢云母的鉴定。     

西藏玉龙斑岩铜矿床绢云母族蚀变矿物短波红外光谱特征及对勘查的指示意义

玉龙斑岩铜矿晚期绢云母化、黏土化蚀变强烈叠加在早期的钾硅酸盐化带内,模糊了蚀变分带特征及其与铜矿化之间的相关性.利用短波红外光谱(SWIR)可快速识别斑岩铜矿床内含羟基蚀变矿物,根据该类矿物的空间分布特征与矿化的对应关系,指导找矿勘查工作.本文对玉龙铜矿床靠近斑岩体中心的三个钻孔进行了详细的蚀变-矿化编录和SWIR分析...     

Potassium–Argon Ages of the Epithermal Gold–Silver Mineralization in the Haenam–Jindo Area,Southwestern Korea

The Haenam–Jindo area, located on the southwestern margin of the Korean Peninsula, was the site of vigorous volcanic activity during the Late Cretaceous and Early Tertiary periods. Large parts of the area record strong hydrothermal alteration, and there exist many clay–alunite and gold–silver deposits. We undertook potassium–argon (K–Ar) age dating of five mineral samples (including adularia, sericite and alunite) from the Eunsan, Moisan and Gasado epithermal gold–silver deposits in this area. The purities of the samples were confirmed by X‐ray diffraction analysis. The K–Ar ages of adularia from the Eunsan deposit and adularia and sericite from the Moisan deposit (related to gold–silver mineralization) are 75.0 ± 1.6, 74.7 ± 1.6 and 75.1 ± 1.6 Ma, respectively. The similarity of these ages, combined with the close proximity and similar geochemical characteristics of the deposits, indicates that the mineralization occurred as part of a single hydrothermal system. The K–Ar ages of alunite at the surface and adularia at depth within the Gasado deposit are 82.2 ± 1.9 and 70.7 ± 1.9 Ma, respectively, revealing that the clay–alunite and gold–silver mineralization formed at different ages. K–Ar age data indicate that the gold–silver mineralization in this area occurred mainly at 75–70 Ma, resulting from hydrothermal activity in the Haenam–Jindo area (82–70 Ma). This is the first time that the mineralization of precious metals in Korea has been identified during this period.     

硅烷偶联剂-PMMA复合接枝包覆绢云母及其改性机理

通过硅烷偶联剂-PMMA复合接枝聚合在超细绢云母粉体表面接枝上聚合物,得到核壳型PMMA/绢云母。经红外光谱(IR)分析知其改性机理为:硅烷偶联剂KH570与超细绢云母表面的羟基发生化学键合而实现预先接枝不饱和基团;在适当的聚合条件下,粉体表面的乙烯基与甲基丙烯酸甲酯单体共聚合,得到核壳型PMMA/绢云母。用热分析(DSC-TG)方法研究了偶联条件及共聚合的条件,得出核壳型PMMA/绢云母的制备条件是:偶联剂浓度7.5%,偶联温度70℃,偶联时间3h;单体用量12.5mL/g,引发剂用量0.015g/mL,温度80℃,时间9h。增加聚合度可以得到绢云母/PMMA复合粉,透射电镜(TEM)观察知绢云母在聚合物中高度分散无团聚。     

基于红外光谱技术研究云南普朗斑岩铜矿的蚀变和矿化特征

近年来红外光谱技术作为一种绿色、快速、无损、精确探测矿物的技术手段而倍受关注,针对斑岩型矿床蚀变矿物高度叠加、蚀变分带界线不明显、细粒蚀变矿物多、黏土蚀变矿物多等特征,该技术在蚀变矿物识别和勘探信息解读等方面优势突出。本文应用红外光谱技术对云南普朗斑岩铜矿区钻孔ZK1801岩心进行矿物识别和蚀变分带划分的研究,识别出钾硅酸盐化带、绿帘石-绿泥石化带、绿泥石-伊利石化带、石英-伊利石化带和泥化带。研究表明:普朗铜矿整个钻孔的蚀变矿物主要有石英、钾长石、绢云母、绿泥石、绿帘石、高岭石、蒙脱石、伊利石等;根据矿化特征,发现铜矿体广泛赋存在钾硅酸盐化带和绿帘石-绿泥石化带中,与矿化关系密切的蚀变矿物"石英+钾长石+绢云母"和"绿帘石+绿泥石",可以作为普朗矿床勘查的标型蚀变矿物组合;研究区广泛发育的绢云母Al—OH波长随钻孔深度增加而逐渐从2210～2205nm减小到2202～2198nm, Al—OH波长2210～2205nm(长波绢云母)与矿化关系密切,可以作为普朗矿床勘查的指示信息。     

Application of Principal Component Analysis and Spectral Angle Mapper in the Mapping of Hydrothermal Alteration in the Jebal–Barez Area,Southeastern Iran

The southeastern part of the central Iranian Cenozoic magmatic belt contains many areas with copper mineralization. In an analysis of this region, we used the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Enhanced Thematic Mapper plus (ETM⁺) images to map the distribution of hydrothermally altered rocks, based on their mineral assemblages. The spectral measurements, based on the field samples and satellite‐image‐derived spectra, show dominantly Al–OH (sericite and clays) and Fe–O absorption features in the visible–near infrared to shortwave infrared regions of the spectrum. Silica–bearing rocks, as well as silicic alteration, show an intense Si–O vibrational feature in the thermal infrared wavelength region. We analyzed ASTER/ETM⁺ images, performed a directed principal component analysis, and used spectral angle mapper to map areas of hydrothermal alteration and iron oxide/hydroxide minerals. The individual principal component images compiled by directed principal component analysis reveal the distribution of individual alteration minerals such as sericite, kaolinite, chlorite, epidote, and quartz. The best results, in terms of mapping the distribution of alteration, were obtained using the spectral angle mapper method. The altered areas were then sampled and the samples subjected to X–ray diffraction analysis, spectral analysis, and thin sections were observed under a microscope. Field observations reveal that more than 98% of the known copper mineralization occurs within the interpreted alteration areas. The present results indicate the great potential of ASTER and ETM⁺ data for mapping the distribution of alteration and exploring for copper mineralization in areas with a similar climate and geological setting to those of the present study.