硅灰石的单独测定

硅灰石作为工业矿物应用于陶瓷、涂料、塑料及橡胶工业等方面。硅灰石矿物夹杂有方解石、白云石和透辉石;地质工作者欲求得硅灰石矿物组分含量,一般由大量岩石全分析数据来计算;此法不     

硅灰石的单独测定

硅灰石作为工业矿物应用于陶瓷、涂料,塑料及橡胶工业等方面。硅灰石矿物夹杂有方解石、白云石和透辉石;地质工作者欲求得硅灰石矿物组分含量,一般由大量岩石全分析数据来计算;此法不     

硅灰矿石中的硅灰石、方解石、白云石的物相分析法——钙量法

一、前言硅灰石矿物是一种自然产出的偏硅酸钙。它作为工业矿物仅有二十余年的历史。硅灰石的主要用途是作为陶瓷工业的配料,此外还在涂料工业、塑料与胶橡工业、磨料工业、电焊和绝缘产品等方面也得到应用。硅灰石的分子式为〔CaO·SiO_2〕_3,其理论组成是 CaO 48.3%、SiO_2 51.7%,组份中的钙可被少量的铁、锰及镁所置换。它是一种接触变质矿物,与其共生的常见矿物有石英、方解石,透辉石、石榴石、白云石。我省长崴子硅灰石矿经 X 光衍射和镜下观察,     

我国硅灰石矿床成因类型及地质特征

前言在我国,硅灰石是一种新兴的工业矿物原料。自1975年于湖北省大冶县小箕铺发现有一定规模的硅灰石矿床以来,我国硅灰石地质及其工业应用的研究发展很快。短时间内找到并探明了一批质量好、又有一定规模的硅灰石矿床;以硅灰石为主要原料的低温快烧釉面砖的研     

滨海石英砂和石灰岩合成硅灰石的实验研究

硅灰石作用为一种新型工业材料,已得到广泛应用。地壳中硅质和钙质的矿物资源极其丰富,为弥补天然硅灰石矿产的不足,欧美及日本等发达国家部很重视合成硅灰石的研究与生产,并已投入了工业性生产。     

关于硅灰石化学分析项目的研究

硅灰石矿物是一种自然产出的偏硅酸钙,其分子式为[CaO·SiO_2]_3,理论组成是CaO48.3％、SiO_251.7％。它作为工业矿物仅有卅年的历史,由于它具有低温快速烧成的窑业性能,近几年来已引起国内外有关行业的重视。其化学分析项目仍沿用了最初规定的SiO_2、CaO、MgO、Fe_2O_3、Al_2O_3和灼减等6项。从吉林省所发现的几处硅灰石产地来看,其主要矿物成份是硅灰石、方解石、尚有少量白云石、透辉石、石榴石和葡萄石伴生。测定SiO_2、CaO是想知道矿物的主要成份;测定MgO想知道矿物中透辉石、白云石的含量;测定Al_2O_3想知道矿物中石榴石的含量;测定Fe_2O_3想了解矿物中的有害成份;测定灼减想知道矿物中CO_2的大概数。一般说来测定这6个项目基本上能判定硅灰石的质量。对硅灰石矿床进行工业评价时,主要以矿石中有益矿物硅灰石和     

一神潜在的硅灰石资源─—黄磷渣

本文叙述了新型工业矿物硅灰石的矿物学特征、物理性质、应用领域和应用概况，讨论了贵州黄磷渣的化学成分、矿物组成及物理性质，认为黄磷渣是一种可供利用的潜在硅灰石资源。     

一种潜在的硅灰石资源——黄磷渣

本文叙述了新型工业矿物硅灰石的矿物学特征，物理性质，应用领域和应用概况，讨论了贵州黄磷渣的化学成分，矿物组成及物理性质，认为黄磷渣是一种可供利用的潜在硅灰石资源。     

贵州首次发现副硅灰石

铝的偏硅酸盐矿物(Ca〔Si_3O_9〕)或CaSiO_3)有三种变体:①低温变体副硅灰石②低温变体硅灰石③高温变体环硅灰石。在自然界硅灰石分布普遍,副硅灰石、环硅灰石少见。副硅灰石是典型的热变质灰岩中接触变质矿物。     

从玄武岩铸石论月球玄武岩的冷却史

一、引言铸石是利用天然岩石,如玄武岩、辉绿岩或某些工业废渣为原料,经配料或直接熔化、浇铸成型、结晶、退火而成的一种工艺岩石。它的矿物组分主要为单斜辉石,磁铁矿的量很少,在个别情况下可有少量橄榄石。从生产技术来看,铸石就是把天然玄武岩类所含的复杂矿物相用人工转变为单一矿物相,也就是将原料中大量的斜长石和相当量的橄榄石     

Cluster type of silicate vaporization: Newly obtained experimental data

Impact cratering is usually associated with the partial or complete vaporization of the high-temperature impact melts. According to its chemical characteristics, the vaporization of major oxides, silicate minerals, and rock melts can be classified into the following four types: (1) congruent vaporization without decomposition of the compound in the vapor phase, (2) congruent vaporization with the decomposition of the compound in the vapor phase, (3) incongruent vaporization, and (4) cluster vaporization. The latter type of vaporization pertains to the transfer of material into vapor phase in the form of complicated atomicmolecular groups (clusters) of certain stoichiometry. Cluster vaporization takes place at superhigh temperatures typical of impact processes. The clusters can comprise compounds of different individual volatility, and this often results in the enrichment of the vapor phase in elements traditionally thought to be refractory. Examples of cluster vaporization are offered by lately obtained experimental results on laser-pulse vaporization of larnite, merwinite, and wollastonite. Condensed vapor generated at the vaporization of orthosilicates (larnite and merwinite) was proved to be dominated by chain bonds of Si-O tetrahedrons and to contain molecular groups of wollastonite and pseudowollastonite stoichiometry.     

广西平乐硅灰石矿工艺矿物学研究

对广西平乐硅灰石矿的化学成分和矿物组成进行了分析确定，对硅灰石及其伴生矿物的结构构造特征进行了查定，主要对硅灰石中碳质物的赋存特征进行了研究，发现硅灰石矿石中的碳质物分别与硅灰石、方解石、石英等多种矿物以多种形式紧密伴生，认为要提高平乐硅灰石粉的白度，除了要尽可能除去透辉石、石榴石等矿物杂质及含铁、锰等的氧化物杂质外，关键还要使碳质物单体解离，并除去碳质物杂质。     

Hot-fluid Driven Metasomatism of Samalpatti Carbonatites, South India: Evidence from Petrology, Mineral Chemistry, Trace Elements and Stable Isotope Compositions

The magmatic heritage of carbonatites can be identified on the basis of a combination of geological criteria such as, their mode of occurrence, the nature of associated igneous rocks, the presence of minerals of igneous origin, fenitization, characteristic trace element contents and isotopic composition. Late Proterozoic Samalpatti carbonatites were studied in view of these criteria, and were found to contain metamorphic minerals that normally form under thermal metamorphic conditions and which have unusual chemical compositions. A combination of criteria points clearly to a magmatic origin for these carbonatites. Field relations indicate that the dominant modes of intrusion of carbonatite into the encompassing pyroxenites and syenites include small dykes, veins, or lenses. The igneous nature of these carbonatites has been described elsewhere and chemically they are classified as calico-carbonatites. Currently, very little is known about the metamorphic textures and mineralogy observed in the Samalpatti carbonatites. In this study, several metamorphic minerals are reported including diopside, grossularite, vesuvianite, K-feldspar and wollastonite, and a hornfelsic texture is described. These mineral phases and texture characterize thermal metamorphism under low pressure and high temperature (LP-HT) metamorphic conditions (650°_750°C) or metasomatism aided by hot-fluid advection. The metamorphic nature of minerals reported is also confirmed by electron microprobe study. The Samalpatti carbonatite samples show much lower values of characteristic trace elements (P, Sr, Ba, Zr, Nb, Th, Y and REEs) than average concentrations for magmatic carbonatite. Stable isotopic (d¹³C and d¹⁸O) compositions of Samalpatti carbonatites do not fall in the primary igneous carbonatite (PIC) domain. The petrological and chemical signatures of these carbonatites suggest metasomatism in conjunction with fluid advection. Such a metasomatic process may drastically change the chemistry of the rocks in addition to enrichment of heavier stable isotopes. During this metasomatic process, characteristic elements would be dissolved in the high d¹⁸O fluid, and together with Rayleigh fractionation would contribute to enhanced concentrations of ¹³C and ¹⁸O in Samalpatti carbonatites.     

地电化学提取法机理研究

通过系统地研究几种矿物及土壤中的铜离子在电场作用下的溶出机理及迁移规律，得出地电化学提取法中的一般规律。在激发电场作用下，土壤中矿物的成矿元素可被加速溶出，并发生难溶形态→溶解度稍大的形态→可溶形态转化。同时离子的扩散系数最大比未加电场时增大约500倍．离子的迁移速度也增大了约50倍，流量也有明显提高。地电提取法提取的元素异常主要来源于电极周围附近的土壤(及所含的矿物)中。该异常是深部矿物所形成的离子晕的结果．并且与土壤中矿物元素的化学形态有关。     

中国海大陆架沉积物地球化学的若干模式

大陆架是大陆向海底的自然延伸部分,是大陆和海洋之间的过渡区,在这一特定环境中形成的沉积物,一方面对大陆有“继承性”,另一方面也留下了海洋的“烙印”,从而构成独特的地球化学特征。本文基于历年对中国海大陆架沉积物地球化学的研究,试图对大陆架沉积物地球化学的若干模式,进行初步的探讨。     

索伦石的晶体结构

索伦石是1961年在我国发现的一种新矿物。成分为CaO·SiO₂·H₂O,是人工和天然的含水硅酸钙矿物中CaO∶SiO₂∶H₂O=1:1:1的唯一一种矿物,因此索伦石结构的测定对了解这一类矿物的晶体化学当有助益。     

我国东部白垩纪蚀变火山岩中的斜发沸石和丝光沸石

沸石是一种含水的碱和碱土金属的骨架状铝硅酸盐。由于沸石具有分子筛的作用,在应用中通常又将沸石称为分子筛。沸石作为催化剂、干燥剂、吸附剂和离子交换剂广泛地应用于工农业各个方面。天然沸石作为一种新型的矿物资源越来越为人们所重视。     

硅灰石、透辉石在陶瓷中的基本反应和作用

本文以硅灰石和高岭石、透辉石和高岭石为端元组分,推导了二元假相图。根据这两个假相图,提出了四个基本固相反应。用这些基本反应以及硅灰石、透辉石的矿物学性质,说明了它们对陶瓷坯体工艺性能的作用。     

Chemical weathering of granite under acid rainfall environment, Korea

Chemical weathering was investigated by collecting samples from five selected weathering profiles in a high elevation granitic environment located in Seoul, Korea. The overall changes of chemistry and mineralogical textures were examined reflecting weathering degrees of the samples, using polarization microscopy, X-ray diffraction (XRD), electron probe micro analysis (EPMA), X-ray fluorescence spectroscopy (XRF), and inductively coupled plasma–mass spectroscopy (ICP–MS). The chemical distribution in the weathering profiles shows that few trace elements are slightly immobile, whereas most major (particularly Ca and Na) and trace elements are mobile from the beginning of the granite weathering. On the other hand, there were mineralogical changes initiated from a plagioclase breakdown, which shows a characteristic circular dissolved pattern caused by a preferential leaching of Ca cation along grain boundaries and zoning. The biotite in that region is also supposed to be sensitive to exterior environmental condition and may be easily dissolved by acidic percolated water. As a result, it seems that some rock-forming minerals in the granitic rock located in Seoul are significantly unstable due to the environmental condition of acidic rainfall and steep slopes, where they are susceptible to be dissolved incongruently leading some elements to be highly depleted.     

气液包裹体气相色谱分析及其地质意义

矿物中气液包裹体的气体成分的研究,对于了解岩石矿床的形成条件及指导找矿有重要意义。为此我们改造了国产SP2305型气相色谱仪,使它适用于包裹体的气体分析,得到较好的效果。用这种设备,我们曾对几个火山岩铁矿、变质铁矿和热液矿床进行了研究,并获得初步结果。