江西黄沙石英脉型钨矿床流体包裹体研究   总被引：13，自引：0，他引：13  

王旭东  倪培  袁顺达  吴胜华 《岩石学报》2012,28(1):122-132

黄沙钨矿床是赣南地区一大型石英脉型钨多金属矿床。本文采用"流体包裹体组合"的研究方法,对黄沙钨矿床主成矿阶段早期的黑钨矿-石英脉和晚期的硫化物-(黑钨矿)-石英脉石英中的流体包裹体进行了显微测温和拉曼探针的分析。研究表明,黑钨矿-石英脉中包裹体主要为水溶液包裹体和含CO₂水溶液包裹体,硫化物-(黑钨矿)-石英脉中主要发育水溶液包裹体。黑钨矿-石英脉中包裹体的均一温度明显高于硫化物-(黑钨矿)-石英脉中的包裹体,但两者水溶液包裹体的盐度相差不大。激光拉曼探针测试表明,两期矿脉中水溶液包裹体的组分主要为水,在黑钨矿-石英脉中的含CO₂水溶液包裹体,除CO₂外,还检测到CH₄和N₂组分。研究表明,以CO₂逸失为特征的流体不混溶作用是早期黑钨矿-石英脉含矿流体中的金属络合物分解并沉淀成矿的主要机制,晚期硫化物-(黑钨矿)-石英脉中矿质的沉淀则主要是流体的混合作用导致。  相似文献   

宜昌黄陵地区板苍河金矿中的含H₂S、有机质包裹体     

常海亮  韩友科 《矿床地质》1998,17(Z6):1071-1074

板苍河金矿是典型的岩浆热液型金矿床。石英中发育的裹体有: ① 富CO₂包亵体; ②含L _CO2多相包裹体; ③ 两相气液包裹体; ④ 有机质包裹体; ⑤ 单相水溶液包裹体。群体包裹体成份分析结果中SO₄^2-高,在冷冻法测定时出现乩S水合物,而激光拉曼探针分析结果证实其中有较多的H₂S、HS^-和有机质。在对这种包裹体进行详细研究基础上,对有关问题进行了有益的讨论。  相似文献   

河北省青龙满族自治县四拨子-六拨子钼铜矿床成矿流体及成矿机制探讨     

李强  孟祥元  武峰  王立生  张志欣  杨富全  刘锋 《岩石学报》2012,28(1):302-318

河北省青龙满族自治县四拨子-六拨子钼铜矿位于燕辽成矿带东部,是近年来发现的中型钼铜矿床。辉钼矿呈细脉状、网脉状、浸染状、薄膜状赋存于长城系石英砂岩及白云岩中的矽卡岩带,钼矿化与硅化关系密切。矿体呈似层状、脉状和透镜状。矿床的形成经历了矽卡岩期和石英-硫化物期,铜和钼矿化主要形成于石英-硫化物期。研究表明,矽卡岩期矿物以发育液体包裹体为特征,石英-硫化物期石英中主要发育液体包裹体、含CO₂两相和三相包裹体。矽卡岩期成矿流体为高-中温(192~497℃)、中-低盐度(5.41%~16.53% NaCleqv)、中-低密度(0.59~0.92g/cm³)的NaCl-H₂O体系。石英-硫化物期成矿流体为中-低温(主要变化于160~330℃)、低盐度(2.07%~15.17% NaCleqv)和中低密度(0.69~1.01g/cm³)的NaCl-H₂O-CO₂ (±CH₄/N₂)型流体。石英的δD_SMOW为-128‰~-80‰,δ¹⁸O_SMOW值为9.6‰~14‰,δ¹⁸O_H2O值为-3.61%~5.30‰,表明成矿流体具有岩浆水混合大气降水的特征。硫化物的δ³⁴S变化于-0.9‰~5.7‰,平均值为2.9‰,表明成矿物质中硫来自深部岩浆。成矿时代为早侏罗世早期,成矿作用与花岗斑岩岩浆期后热液活动有关。  相似文献   

阿尔泰晚古生代超高温麻粒岩流体特征及其意义     

杨孝强  厉子龙 《岩石学报》2013,29(10):3446-3456

北疆阿尔泰造山带南缘晚古生代超高温麻粒岩存在高铝斜方辉石+夕线石+石英和尖晶石+石英等超高温特征矿物组合,其退变质作用主要以典型的降压反应矿物堇青石的形成为标志。对其中新发现的石榴子石及石英流体包裹体开展显微测温和激光拉曼探针分析,结果表明:基质中的石英以及被石榴子石包裹的石英中孤立分布的原生流体包裹体成分为近纯CO₂(部分含少量的N₂),均一温度在10.1~29℃之间,其对应的密度在0.631~0.861g/cm³。石榴子石中的原生和假次生CO₂包裹体费米峰差在104.1cm^-1左右,低于石英中CO₂包裹体的费米峰差(~104.7cm^-1),暗示其密度低于石英中的CO₂包裹体。由CO₂流体包裹体密度所得到的等容线从P-T轨迹退变质阶段的下方穿过结合区域地质背景,我们初步认为阿尔泰超高温麻粒岩的形成与幔源岩浆底侵有关。基性岩浆的底侵不但提供了异常高的地温梯度,同时其所释放的大量CO₂降低了水活度,使得变质作用峰期的特征矿物得以保存。低密度的CO₂流体指示了阿尔泰超高温麻粒岩沿顺时针P-T轨迹紧随超高温峰期变质之后快速抬升降压,捕获的同变质流体包裹体因腔体体积增大而密度降低的一种退变质过程。  相似文献   

Nitrogen and Oxygen Isotope Balance in Tropospheric N2O—An Improved Budget     

徐文彬  洪业汤等 《中国地球化学学报》1999,18(2):187-192

In steady state the stable isotopic composition of nitrogen and oxygen in tropospheric N2O is balanced by isotopically light N2O emitted from soils and oceans and isotopically heavy N2O as a return flux from the stratosphere.However,no such balance was reached in calculations given by Kim and Caig(1993).Modifications have been made on their calculations based on the most recent reports on annual global emission of N2O.It is considered that the nitrogen and oxygen isotope budget in tropospheric N2O are approximately in balance if isotopic fractionation effects during the production of N2O in soils and furthermore this paper puts forward further evidence for validating the above results.  相似文献   

The nature of fluids during pegmatite development in metamorphic terrains: Evidence from Hamadan complex,Sanandaj-Sirjan metamorphic zone,Iran     

F. Masoudi  B. Mehrabi  M. Rezai Aghdam  B. W. D. Yardley 《Journal of the Geological Society of India》2009,73(3):407-418

In the Sanandaj-Sirjan zone of metamorphic belt of Iran, the area south of Hamadan city comprises of metamorphic rocks, granitic batholith with pegmatites and quartz veins. Alvand batholith is emplaced into metasediments of early Mesozoic age. Fluid inclusions have been studied using microthermometry to evaluate the source of fluids from which quartz veins and pegmatites formed to investigate the possible relation between host rocks of pegmatites and the fluid inclusion types. Host minerals of fluid inclusions in pegmatites are quartz, andalusite and tourmaline. Fluid inclusions can be classified into four types. Type 1 inclusions are high salinity aqueous fluids (NaCl_eq >12 wt%). Type 2 inclusions are low to moderate salinity (NaCl_eq <12 wt%) aqueous fluids. Type 3 and 4 inclusions are carbonic and mixed CO₂-H₂O fluid inclusions. The distribution of fluid inclusions indicate that type 1 and type 2 inclusions are present in the pegmatites and quartz veins respectively in the Alvand batholith. This would imply that aqueous magmatic fluids with no detectable CO₂ were present during the crystallization of these pegmatites and quartz veins. Types 3 and 4 inclusions are common in quartz veins and pegmatites in metamorphic rocks and are more abundant in the hornfelses. The distribution of the different types of fluid inclusions suggests that CO₂ fluids generated during metamorphism and metamorphic fluids might also contribute to the formation of quartz veins and pegmatites in metamorphic terrains.  相似文献   

Elastic and thermoelastic properties of synthetic Ca<Subscript>2</Subscript>MgSi<Subscript>2</Subscript>O<Subscript>7</Subscript> (åkermanite) and Ca<Subscript>2</Subscript>ZnSi<Subscript>2</Subscript>O<Subscript>7</Subscript> (hardystonite)     

S.?HaussühlEmail author  J.?Liebertz 《Physics and Chemistry of Minerals》2004,31(8):565-567

Elastic and thermoelastic constants of large single crystals of Ca₂MgSi₂O₇ and Ca₂ZnSi₂O₇ have been derived from ultrasonic resonance frequencies of plane-parallel plates and their shift upon variation of temperature, respectively. In addition, coefficients of thermal expansion and dielectric constants were determined. Both species possess quite similar properties. As observed in other isotypic magnesium and zinc compounds, the mean elastic stiffness and the deviation from the Cauchy relations are significantly larger in the zinc compound, due to a covalent contribution of the Zn–O bond. Positive thermoelastic constants T₄₄ and T₆₆ in Ca₂MgSi₂O₇ allow temperature-independent ultrasonic generators and oscillators to be manufactured.  相似文献   

硅酸盐玻璃中的Na和K含量电子探针分析条件设定探讨     

李芳洲  李小犁 《岩矿测试》2022,(2):161-173

含Ti硅酸盐玻璃在基础科学研究和应用技术开发上均有重要价值,亟需对其进行准确的成分分析,为进一步的科研工作提供重要的数据支撑.对玻璃进行电子探针分析时,由于样品的易损性和其中(Na和K)阳离子在电子束轰击下极易发生迁移和扩散,因此往往需要经过条件实验来确定合适的分析条件,确保样品在该条件下能够保持尽量稳定的状态,才能获...  相似文献   

Numerical modeling of thermal structure, circulation of H₂O, and magmatism–metamorphism in subduction zones: Implications for evolution of arcs   总被引：2，自引：2，他引：0  

Hikaru Iwamori  Chris Richardson  Shigenori Maruyama 《Gondwana Research》2007,11(1-2):109

Numerical models on thermal structure, convective flow of solid, generation and transportation of H₂O-rich fluid in subduction zones are consolidated to have a comprehensive view of the subduction zone processes: heat balance, circulation of H₂O magmatism–metamorphism, growth of arcs and continental margins. A large scale convection model with steady subduction of a cold old slab (130 Myr old) predicts rapid ( 100 Myr) cooling of subduction zones, resulting in cessation of magmatism. The model also predicts that the mantle temperature beneath arcs and continental margins is greatly affected by the effective temperature of the subducting slab, i.e., the age of the subducting slab. If subduction of a young hot slab, including ridge subduction, occurs every 60 to 120 Myr as is suggested for eastern Asia, the average temperature beneath arcs is increased by about 300 °C, which may explain the long-lasting magmatism in eastern Asia. Associated with subduction of young slabs and ridges, thermal structure and circulation of H₂O are greatly modified to cause a transition from (1) normal arc magmatism, (2) forearc mantle melting, to (3) slab melting to produce a significant amount (100 km³) of granitic melts, associated with both high-P/T and low-P/T type metamorphism. The last stage of (3) can result in formation of a granitic batholith belt and a paired metamorphic belts. Synthesis of the numerical models and observations suggest that episodic subduction of young slabs and ridges can explain heat source for generating a large amount of granitic magmas of batholiths, synchronous formation of batholith and regional metamorphic belts, and P–T conditions of the paired metamorphism. Even the high-P/T metamorphism requires an elevated geothermal structure in the forearc region, associated with ridge subduction. Although the emplacement of the batholiths and the regional metamorphic belts, and the mass balance in subduction zones are not well constrained at present, the episodic event associated with ridge subduction is thought to be essential for net growth of arcs and continental margins, as well as for the long-term heat balance in subduction zones.  相似文献   

Hydrometallurgical processing and recovery of molybdenum trioxide from spent catalyst   总被引：5，自引：0，他引：5  

Kyung Ho Park  B. Ramachandra Reddy  D. Mohapatra  Chul-Woo Nam 《International Journal of Mineral Processing》2006,80(2-4):261-265

Hydrometallurgical processing of spent hydrodesulphurisation (HDS) catalyst for the recovery of molybdenum using sodium carbonate and hydrogen peroxide mixtures was investigated. The results indicated that the recovery of molybdenum was largely dependent on the concentrations of Na₂CO₃ and H₂O₂ in the reaction medium, which controls the acidity of the leach liquor and carry over of impurities such as Al, Ni, P, Si and V. Leaching process was exothermic and leaching efficiency of molybdenum decreased with increasing solid to liquid ratio. Large scale leaching of spent catalyst, under optimum conditions: 20% pulp density, 85 g/L Na₂CO₃, 10 vol.% H₂O₂ and 1 h reaction, resulted a leaching efficiency of 84% Mo. The obtained leach liquor contained (g/L): Mo — 22.0, Ni — 0.015 and Al — 0.82, P — 1.1, Si — 0.094 and minor quantities of V — 8 mg/L, As and Co — < 1 mg/L. Recovery of Mo from leach solution as MoO₃ of 97.30% purity was achieved by ammonium molybdate precipitation method.  相似文献   

钒钛磁铁矿中V₂O₅和TiO₂的连续测定     

王荣社  刘智鹏  李智涛  谢媛 《岩矿测试》2013,32(6):982-985

  相似文献   

Effects of nitrogen on the ecosystem respiration,CH<Subscript>4</Subscript> and N<Subscript>2</Subscript>O emissions to the atmosphere from the freshwater marshes in northeast China   总被引：1，自引：0，他引：1  

Lihua Zhang  Changchun Song  Xunhua Zheng  Dexuan Wang  Yiyong Wang 《Environmental Geology》2007,52(3):529-539

Freshwater marshes could be a source of greenhouse gases emission because they contain large amounts of soil carbon and nitrogen. These emissions are strongly influenced by exogenous nitrogen. We investigate the effects of exogenous nitrogen on ecosystem respiration (CO₂), CH₄ and N₂O emissions from freshwater marshes in situ in the Sanjiang Plain Northeast of China during the growing seasons of 2004 and 2005, using a field fertilizer experiment and the static opaque chamber/GC techniques. The results show that there were no significant differences in patterns of seasonal variations of CO₂ and CH₄ among the fertilizer and non-fertilizer treatments, but the seasonal patterns of N₂O emission were significantly influenced by the exogenous nitrogen. Seasonal averages of the CO₂ flux from non-fertilizer and fertilizer were 987.74 and 1,344.35 mg m ⁻² h ⁻¹, respectively, in 2004, and 898.59 and 2,154.17 mg m ⁻² h ⁻¹, respectively, in 2005. And the CH₄ from the control and fertilizer treatments were 6.05 and 13.56 mg m ⁻² h ⁻¹ and 0.72 and 1.88 mg m ⁻² h ⁻¹, respectively, in 2004 and 2005. The difference of N₂O flux between the fertilizer and non-fertilizer treatments is also significant either in 2004 and 2005. On the time scale of 20-, 100-, and 500-year periods, the integrated global warming potential (GWP) of CO₂ + CH₄ + N₂O released during the two growing seasons for the treatment of fertilizer was 97, 94 and 89%, respectively, higher than that for the control, which suggested that the nitrogen fertilizer can enhance the GWP of the CH₄ and N₂O either in long time or short time scale.  相似文献   

Viscosity of andesitic melts—new experimental data and a revised calculation model     

Francesco Vetere  Harald Behrens  Daniel R. Neuville 《Chemical Geology》2006,228(4):233-245

The viscosity of a synthetic andesite-like melt was measured in the low viscosity range (10¹-10⁶ Pa s) using the falling sphere(s) method and in the high viscosity range (10⁸-10¹³ Pa s) using parallel-plate viscometry. Falling sphere experiments with melts containing 2.3 and 5.6 wt.% H₂O were carried out in an internally heated gas pressure vessel (IHPV) at 500 MPa confining pressure. The sinking velocity of Pt and Pd spheres and in one case of a corundum sphere was used to measure the melt viscosity. In addition, a creep experiment was performed at ambient pressure using a glass containing 2.73 wt.% H₂O . A more water-rich glass (5.6 wt.% H₂O ) was investigated with a high pressure parallel-plate viscometer at 400 MPa confining pressure in an IPHV. By combining our new data with previous results for a similar melt composition we derived the following expression to describe the viscosity η (in Pa s) as a function of temperature T (in K) and water content w (in wt.%)