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河南支建铝土矿的矿物学特征研究 总被引：5，自引：0，他引：5
河南支建铝土矿是一水硬铝石型土矿。该矿的矿物组成为一水硬铝石、高岭石、伊利石、绿泥石,赤铁矿、锐钛矿和金红石。此外,还有电气石、锆英石、磷铝锶矿等微量矿物。在扫描电镜中发现一种微量叶片状未知矿物,确定该矿物为叶蜡石。 相似文献
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红外光谱技术,辅以显微镜下鉴定和矿物地球化学分析,通过系统采集达斯矿区地表岩石与钻孔岩芯样品,开展精细蚀变矿物填图,利用绢云母矿物Al- OH基团在2200 nm附近的光谱变化特征,开展勘查区及其外围的找矿预测。结果显示：① 研究区主要矿物为钠长石、微斜长石、石英、绢云母、高岭石、蒙脱石和绿泥石,另含有少量明矾石、电气石、石膏和黑云母等;② 电气石、明矾石、高岭石和绢云母矿物及其组合与成矿关系密切,具有中硫化浅成低温热液型矿床蚀变矿物组合特征;③ 目前已发现的Pb矿（化）体,主要产于300 m以浅,矿体底板为一套蒙脱石+绿泥石为主的蚀变矿物组合。矿体赋存于绢云母（高岭石+少量明矾石+电气石）蚀变带内,蚀变分带特征（矿化体中心向外）表现为：绢云母化→绢云母+高岭石（+少量明矾石+电气石）→绢云母+蒙脱石→蒙脱石+绿泥石;④ 区内长波绢云母指示了深部热源的位置,短波绢云母反映出热液流体与浅部大气降水的混合作用,根据绢云母矿物Al- OH波长插值填图及矿物组合特征变化确定了成矿流体pH值偏中性、温度逐渐降低的变化趋势;⑤ 绢云母矿物在2200 nm附近的光谱吸收深度与Pb品位之间呈正相关关系,10%吸收深度阈值可区分具有相似Al- OH吸收特征的绢云母和高岭石矿物;⑥ 结合GIS空间叠加分析,认为勘查区外围仍具一定找矿潜力。 相似文献
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江苏省句容县铜山红柱石矿床,矿体赋存在二叠系堰桥组、龙潭组上段角岩化地层中。矿石中主要矿物成分为石英、粘土矿物、炭质、白云岩、黑云母、长石、红柱石,少量及微量矿物有褐铁矿、赤铁矿、黄铁矿、电气石、石榴石、金红石、锆石、方解石等。矿石中主要矿物的比重十分相近,加之是角岩型的红柱 相似文献
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赣南麦饭石的特征及其功能的研究 总被引：3，自引：0，他引：3
赣南麦饭石属燕山晚期石英二长斑岩弱蚀变半风化壳型，矿石具斑状结构，坚硬块状构造，矿石主要矿物成分：斜长石、正长石、石英、黑云母、角闪石，以及磁铁矿、钛铁矿、金红石、磷灰石、水云母、高岭石、绿泥石等。ＳｉＯ＿２、Ａｌ＿２Ｏ＿３、Ｋ＿２Ｏ的平均含量分别为６２．５６％、１６．６８％、４．８８％，稀土元素总量２５２．２７μｇ／ｇ，分布曲线呈枝平缓的向右倾斜型，Ｅｕ无负异常，含有几十种对人体有益微量元素，且有毒有害元素含量低，麦饭石溶出液含量达到国家任用矿泉水标准，对水中重金属离子及酒中杂醇油具扳强吸附作用，对细菌具强吸附性，并有明显的生物活性。 相似文献
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云南省丘北县大铁中型铝土矿是近年来在滇东南地区新发现并探明的一水硬铝石沉积型铝土矿床,矿体赋存于上二叠统龙潭组下段。通过矿相学分析,对大铁铝土矿矿石的矿物组成和主要矿物的赋存状态进行了系统研究。研究结果表明,矿石主要矿物组成为一水硬铝石,其次是高岭石、伊利石、绢云母、绿泥石、锐钛矿、赤铁矿、针铁矿、金红石、玉髓等。一水硬铝石呈现出多种结晶形态和复杂的赋存状态,其嵌布特征主要有以下5种：①呈自形、半自形粒状不均匀地嵌布在脉石矿物中;②呈豆状、土豆状、豆鲕状产出;③呈隐晶质、微晶集合体或极不规则的粒状、微粒状产出;④呈脉状、骸晶状产出;⑤一水硬铝石与铝凝胶或脉石矿物的集合体呈环带状或同心圆状产出。 相似文献
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在野外地质工作、镜下观察的基础上,采用电子探针、X射线粉晶衍射、氢氧稳定同位素测试等方法对江西上饶龙门高岭石-叶蜡石矿床矿石进行了分析。其主要组成矿物为高岭石族矿物、叶蜡石和石英,其次有少量的绢云母、黄铁矿和赤铁矿等。矿石中高岭石族矿物Hinckley指数为0.33～0.94,整体属于较无序高岭石,叶蜡石有2M型和1Tc型两种多型,以2M型为主。矿石的δ18O值为4.5‰～6.6‰,δD值为-71.7‰～-98.5‰。综合分析认为该矿床为晶屑玻屑凝灰岩受热液蚀变而成,其成矿热液主要来自大气降水,成矿温度为75℃～300℃,压力<1kb。 相似文献
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《铀矿地质》2019,(6)
热液蚀变是向阳坪花岗岩型铀矿床的重要找矿标志。利用ASD光谱仪对向阳坪矿床两个含矿钻孔进行岩心高光谱测量,基于光谱分析和光谱匹配技术提取了高岭石、蒙脱石、富铝绢云母、贫铝绢云母、赤铁矿、绿泥石+绢云母、碳酸盐等7类蚀变矿物信息。高光谱岩心编录与钻孔岩性、构造、矿化的综合分析结果表明:豆乍山和香草坪岩体对热液蚀变类型及发育程度的影响均不大,铀矿化和相关的热液蚀变发育主要受断裂构造控制,绿泥石+绢云母、蒙脱石、贫铝绢云母形成于矿前期,赤铁矿、富铝绢云母、高岭石及碳酸盐形成于成矿期—成矿晚期,构造带中的赤铁矿+富铝绢云母+高岭石可作为向阳坪地区铀矿化标型矿物组合。 相似文献
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通过对江汉平原主要河流沉积物的重矿物组合、特征矿物以及能够反映沉积物稳定状况、物源及成熟度的重矿物特征指数(ATi,GZi和ZTR)进行对比分析,发现在江汉平原范围内,长江和汉江及其长江主要支流的沉积物中重矿物特征具有显著的差异。长江的重矿物组合模型为： 锆石+绿帘石+辉石+绿泥石+金属矿物,特征矿物是锆石和辉石; 汉江的重矿物组合模型为： 绿帘石+角闪石+石榴石+绿泥石+金属矿物,特征矿物是角闪石、石榴石; 另外,清江、漳河、沮水和玛瑙河的重矿物组合及特征矿物也都完全不同。而且各水系的沉积物的重矿物特征与其源区的岩性分布显示出极好的相关性。研究表明在江汉平原利用重矿物特征及组合模型来进行物源示踪的方法开展水系演化研究是可行的。 相似文献
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铝土矿是生产金属铝的主要来源,用途广泛。利用偏光显微镜、扫描电镜–能谱、X射线衍射、红外及差热分析等手段,研究晋中南石炭系铝土矿矿物特征,分析主要矿物成因。结果表明,铝土矿中所含矿物主要是硬水铝石和高岭石,少量伊利石、绿泥石、赤铁矿、菱铁矿、针铁矿、锐钛矿、金红石、石英、钾长石及方解石等。硬水铝石分隐晶–微晶碎屑、它形粒状晶体、短柱–鳞片状晶体3种类型,差热曲线吸热峰温度偏低,晶胞参数均值a为0.441 546 nm,b为0.945 445 nm,c为0.285 250 nm。硬水铝石主要由高岭石脱硅转变而成,少量为结晶成因。高岭石形成于温暖潮湿气候的风化过程中,部分为复硅化产物。锐钛矿形成于低温低压、TiO2供应充足的环境中。赤铁矿由含水氧化铁矿物风化脱水形成,少部分为成矿早期沼泽相或海相沉积。石英、钾长石及一些重矿物为陆源碎屑来源。 相似文献
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In the Pötürge (Malatya, Turkey) area pyrophyllite occurrences are common in the shear zones, mostly in the form of lenses along faults. Mineralogical investigations (XRD, FTIR and SEM) revealed that pyrophyllite, kaolinite (dickite) and quartz are present in the form of major phases and muscovite (sericite), kyanite, chlorite, and alunite are only present in the form of minor phases. This study revealed that the existence of the kyanite phase points out to high pressure and temperature conditions which the rocks were underwent. On the other hand, the minerals such as pyrophyllite, kaolinite, and alunite are products of a low degree metamorphism (retrograde). The mineral paragenesis in the pyrophyllite deposits suggests that the formation of minerals took place in two ways: (1) the transformation of kyanite into pyrophyllite and quartz through retrograde metamorphism by a high degree temperature, (2) then pyrophyllite and probably muscovite were transformed into kaolinite and alunite through reactions with relatively low temperature hydrothermal fluids. The geochemical data indicate that during the retrograde metamorphism the elements K, Rb, Sr, Ba, S, and Fe were mobile, the elements Si, Al, P moderately mobile to immobile and the HPS elements (Zr, Ti, and Nb) were immobile. It was shown that the formation of pyrophyllite, kaolinite and alunite was associated with depletion in alkalis, Mg, Fe and enrichment of elements including Sr, Ba, and S. Mineralogical and geochemical data suggest that parent rocks (pre-metamorphism) of the Pötürge pyrophyllite were probably kaolinite, Al-rich clays or bauxites. 相似文献
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Rosia Poieni copper deposit,Apuseni Mountains,Romania: advanced argillic overprint of a porphyry system 总被引：2，自引：0，他引：2
The Rosia Poieni deposit is the largest porphyry copper deposit in the Apuseni Mountains, Romania. Hydrothermal alteration and mineralization are related to the Middle Miocene emplacement of a subvolcanic body, the Fundoaia microdiorite. Zonation of the alteration associated with the porphyry copper deposit is recognized from the deep and central part of the porphyritic intrusion towards shallower and outer portions. Four alteration types have been distinguished: potassic, phyllic, advanced argillic, and propylitic. Potassic alteration affects mainly the Fundoaia subvolcanic body. The andesitic host rocks are altered only in the immediate contact zone with the Fundoaia intrusion. Mg-biotite and K-feldspar are the main alteration minerals of the potassic assemblage, accompanied by ubiquitous quartz; chlorite, and anhydrite are also present. Magnetite, pyrite, chalcopyrite and minor bornite, are associated with this alteration. Phyllic alteration has overprinted the margin of the potassic zone, and formed peripheral to it. It is characterized by the replacement of almost all early minerals by abundant quartz, phengite, illite, variable amounts of illite-smectite mixed-layer minerals, minor smectite, and kaolinite. Pyrite is abundant and represents the main sulfide in this alteration zone. Advanced argillic alteration affects the upper part of the volcanic structure. The mineral assemblage comprises alunite, kaolinite, dickite, pyrophyllite, diaspore, aluminium-phosphate-sulphate minerals (woodhouseite-svanbergite series), zunyite, minamyite, pyrite, and enargite (luzonite). Alunite forms well-developed crystals. Veins with enargite (luzonite) and pyrite in a gangue of quartz, pyrophyllite and diaspore, are present within and around the subvolcanic intrusion. This alteration type is partially controlled by fractures. A zonal distribution of alteration minerals is observed from the centre of fractures outwards with: (1) vuggy quartz; (2) quartz + alunite; (3) quartz + kaolinite ± alunite and, in the deeper part of the argillic zone, quartz + pyrophyllite + diaspore; (4) illite + illite-smectite mixed-layer minerals ± kaolinite ± alunite, and e) chlorite + albite + epidote. Propylitic alteration is present distal to all other alteration types and consists of chlorite, epidote, albite, and carbonates. Mineral parageneses, mineral stability fields, and alteration mineral geothermometers indicate that the different alteration assemblages are the result of changes in both fluid composition and temperature of the system. The alteration minerals reflect cooling of the hydrothermal system from >400 °C (biotite), to 300–200 °C (chlorite and illite in veinlets) and to lower temperatures of kaolinite, illite-smectite mixed layers, and smectite crystallization. Hydrothermal alteration started with an extensive potassic zone in the central part of the system that passed laterally to the propylitic zone. It was followed by phyllic overprint of the early-altered rocks. Nearly barren advanced argillic alteration subsequently superimposed the upper levels of the porphyry copper alteration zones. The close spatial association between porphyry mineralization and advanced argillic alteration suggests that they are genetically part of the same magmatic-hydrothermal system that includes a porphyry intrusion at depth and an epithermal environment of the advanced argillic type near the surface.Editorial handling: B. Lehmann 相似文献