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841.
河北金家庄金矿是一产在透辉石岩体中的矿床。本文用多种方法对该床中的主要矿石物进行了矿物化学、矿物标型和金、银赋存状态等方面的研究。不仅发现了含铂、钯的黄铜矿和闪锌矿,而且还找到了针镍矿。为探讨此金矿床的成矿特点提供了一些矿物学依据。 相似文献
842.
Fluid Inclusion Study of Skarns in the Maruyama Deposit, the Kamioka Mine, Central Japan 总被引:1,自引:0,他引:1
Abstract: Fluid inclusions in skarn minerals in the Maruyama deposit, the Kamioka mine, central Japan were studied. Homogenization temperatures (Th) of fluid inclusions in 48 skarn minerals (hedenbergite, andradite, epidote and quartz) were measured, and gas composition of fluid inclusions in 12 skarn minerals was measured with a quadrupole mass spectrometer. The maximum Th value of primary inclusions in hedenbergite is 380C with peaks around 360C. Primary inclusions in hedenbergite near contact between skarn and limestone have slightly lower Th values and their distribution has a tendency of long trail skirt toward low temperature, which indicates ceasing of skarnization coincides with temperature decrease. Fluid inclusions in andradite and quartz in the hedenbergite skarn have lower Th values, in this order, than those in hedenbergite. CH4–detected fluid inclusions are localized around the Maruyama fault. Gas composition of the fluid inclusions indicates that fluid trapped in the hedenbergite has CO2 content less than 1 mole % and is not in equilibrium with graphite. 相似文献
843.
兰村泉域地下水是太原市经济发展和人民生活的重要水源,近年来,由于不合理的开采和水资源利用量的不断加大,已造成采域地下水位持续下降,甚至干枯,同时度污水排放量与日俱增,水体污染范围在扩展,水质污染程度有所加重.本文利用兰村采城地下水的水化学特征和类型变化,分析了采城地下水的污染程度、污染现状和发展趋势,并提出了保护采城水资源的措施. 相似文献
844.
柱撑粘土矿物材料的晶体结构和晶体化学特征 总被引:13,自引:0,他引:13
以铝基柱撑粘土矿物和钛基柱撑粘土矿物为例,讨论了柱撑粘土矿物材料的晶体结构和晶体化学特点,Al多核笼状阳离子基团的结构形式为1:12Keggin型离子,Ti多核笼状阳离子基团的结构形式为2:19Dawson型离子,两类笼状阳离子的直径均在1nm左右,前者的高度约为0.9nm,后者的高度约为1.4nm,经与粘土矿物层间阳离子交换后,择位固定在粘土矿物层间,由于多核笼状阳离子与粘土矿物硅氧四面体之间形成了较强的化学键,其具有不可交换性,铝基柱撑粘土和钛基柱撑粘土的层间孔道分别为1.2nm*1.2nm*1.2nm,和0.52nm*0.52nm*1.60nm。柱粘土矿物材料有很好的化学稳定性和耐热性,且又有一定的层间化学活性,可用于催化剂载体,由于它又具有选择性吸附能力,有望制造成新一代环保材料。 相似文献
845.
846.
呼斯特岩体位于新疆西天山博罗科努岛弧带中北缘,是博罗科努成矿带东段典型的与矽卡岩矿床成矿有关的中酸性杂岩体。对岩体中的二长花岗岩、花岗闪长岩和暗色包体进行了系统的矿物化学研究,探讨了岩浆的成岩演化过程以及矿物成分与成岩成矿的关系。造岩矿物的化学成分研究表明,呼斯特岩体为典型的I型花岗岩,形成于与俯冲有关的大陆边缘弧环境,成岩物质来自壳幔混源,成岩过程中经历了岩浆混合作用。岩体形成于较高温度(738~770 ℃)、较低压力(057~142 kbar,1 kbar=01 GPa)和高氧逸度环境。二长花岗岩和花岗闪长岩的侵位深度(22~42 km)和高氧逸度有利于可克萨拉—艾木斯呆依铁铜矿床的形成。岩石中的黑云母相对富镁且氧化系数较高,角闪石富镁、富硅且化学成分变化较大,二者均表现出与铁铜矿化有关的成分特征。岩浆混合作用与矿床的形成关系密切,对区内斑岩-矽卡岩型多金属矿床的找矿具有指示意义。 相似文献
847.
Samples of fog water collected in the area of Guangzhou during February, March and April of
2005 are used in this work to study the chemical composition of fog water in polluting fog there. Three
typical episodes of polluting fog are analyzed in terms of ionic concentration and their possible sources. It
is found that the concentration of various ions in fog water is much higher than those in rainwater. Fog not
only blocks visual range but contains liquid particles that result in high degree of pollution and are very
harmful to human health. SO4= is the anion with the highest concentration in fog water, followed by NO3-.For the cation, Ca++ and NH4+ are the highest in concentration. It is then known that rainwater is more
acidic than fog water, indicating that ionic concentration of fog water is much higher than that of rainwater,
but there are much more buffering materials in fog water, like NH4+ and Ca++. There is significant
enrichment of Ca++, SO4=, and Mg++ in fog water. In the Guangzhou area, fog water from polluting fog is
mainly influenced continental environment and human activity. The episodes of serious fog pollution
during the time have immediate relationships with the presence of abundant water vapor and large amount
of polluting aerosol particles. 相似文献
848.
喀斯特地区梯级水库建造对水化学分布的影响 总被引:1,自引:0,他引:1
为深入了解河流梯级筑坝对喀斯特地区河流水化学分布的影响,于2017年1、4、7和10月别对乌江干流洪家渡水库(多年调节)、乌江渡水库(季调节)和索风营水库(日调节) 3个具有不同滞留时间的水库进行水样采集,分析入库水、坝前剖面水和下泄水的水化学特征,探讨河流梯级筑坝对水化学分布及风化速率估算的影响.研究结果表明:3个水库深层水比表层水HCO3-浓度分别高12.9%、5.5%和8.0%,Ca~(2+)浓度分别高15.9%、2.4%和8.5%.河流梯级筑坝一定程度上改变了水体水化学组成,从而影响碳酸盐岩风化速率估算.整体上,洪家渡水库、索风营水库和乌江渡水库的全年风化速率变化范围分别为:-1.7%~15.4%、-5.6%~1.1%和-0.3%~3.4%.河流筑坝作用对风化速率估算及主量离子浓度的影响:HCO_3~-与Ca~(2+)浓度分布均为:洪家水库乌江渡水库索风营水库,这与水体滞留时间长短规律一致,表明水体滞留时间影响着水化学的组成分布.同时水体离子浓度表现出明显的季节性差异,丰水期各水库变化率明显大于枯水期.上述结论表明喀斯特地区河流连续筑坝后水化学组成及分布特征发生了一定程度改变,影响流域化学风化速率的估算,且影响程度随水体滞留时间延长而增大,并受气温影响.因此,今后在估算流域风化速率及探究水化学空间变化时应对筑坝作用加以考虑,以便更加准确地评估喀斯特流域岩石风化在全球碳循环中的作用. 相似文献
849.
Randolph D. Borys Edward E. Hindman Paul J. DeMott 《Journal of Atmospheric Chemistry》1988,7(3):213-239
The relationships between the physical and chemical properties of mixed-phase clouds were investigated at Storm Peak Laboratory (3220m MSL) located near the continental divide in northwestern Colorado. Interstitial aerosol particles, cloud droplets and snow crystals were concurrently collected when the laboratory was enveloped by a precipitating cloud. All samples were analyzed for trace elements, soluble anions, electrical conductivity and acidity.The results show average trace constituent concentration ratios of cloud water to snow water range from 0.4 to 26. All but six of the 32 elements and ions measured had ratios greater than one. This result suggests a chemical species dependency of in-cloud aerosol particle scavenging processes. Evidence of a decrease of in-cloud aerosol particle scavenging efficiency by snow due to increases in aerosol concentration is also presented.Differences between the chemical composition of cloud water and snow water are manifested most strongly when snow crystals grow by vapor deposition. In-cloud scavenging efficiencies by snow crystals for most aerosol particle chemical species are dependent on the growth of the snow crystals by accretion of cloud droplets. This chemical fractionation of the atmospheric aerosol by snow crystal formation and growth should be most active where narrow, continental cloud droplet size distributions and low liquid water contents are prevalent, enhancing the probability of snow crystal growth by diffusion. 相似文献
850.
Global secondary organic aerosol formation (SOA) is currently assumed to be between 11.2 and 270 Tg/yr. This range of uncertainty
is reflected in the gas-phase chemistry. In this study, we focus on the feedback of SOA formation on the concentrations of
most important trace gases such as ozone, and compare it to the impact of monoterpene gas-phase chemistry with a newly developed
reduced monoterpene mechanism (MMM) for either α- or β-pinene in the global chemistry transport model MATCH-MPIC. With this
set-up an uncertainty range of 3.5–4.0% increase in annually averaged tropospheric ozone was found to be caused by the gas-phase
chemistry of the investigated monoterpenes. Moreover, a strong feedback has been observed for NOx, HCHO, HNO3 and PAN. These observations are affected remarkably by different SOA formation approaches like partitioning or saturation
vapour pressure limitation and by the structure of the monoterpene used, e.g. reducing the impact on tropospheric ozone to
1.2–1.9% by using the partitioning approach versus the simulation with gas-phase chemistry only. Therefore, a consideration
of the individual processes associated with SOA formation seems to be necessary to reduce the uncertainty in SOA formation
and to understand the impact of VOCs on atmospheric chemistry.
An erratum to this article is available at . 相似文献