内蒙古额仁陶勒盖银矿床氢、氧、硫、铅同位素研究     

陈祥 《矿床地质》1998,17(Z4):769-772

额仁陶勒盖银矿床是次火山热液作用产物。燕山晚期本区受太平洋板块的边缘影响,额尔古纳断裂带复活,产生壳幔混合作用形成花岗质岩浆。石英斑岩是花岗质岩浆成岩期的最后产物,分异作用导致银在成岩后期及期后成矿热液中富集。因此,石英斑岩是矿床的直接母岩。地表大气水参与了成岩和成矿作用的全过程。  相似文献   

稠环芳烃和多环芳烃成因模拟   总被引：2，自引：0，他引：2  

夏燕青 《沉积学报》1998,16(2):1-4

通过模拟实验发现:硫与β-胡萝卜素反应可以形成稠环芳烃,硫或氧与联苯反应可以形成多种多环芳烃。稠环芳烃主要是以一个合适的分子为基础发展形成的,多环芳烃也可以由一个分子转化形成,但主要是两个或两个以上联苯等化合物分子连接起来而成。  相似文献   

西班牙纳维亚金矿带的硫同位素研究     

Arias.  D 刘崇民 《物探化探译丛》1998,(1):56-61

  相似文献   

快速测定矿石中的银——二苯硫脲泡塑富集分离硫代米蚩酮-洗洁精全差示光度法     

薛光 《黄金地质》1998,(2)

提出了一个二苯硫脲泡塑富集分离硫代米蚩酮－洗洁精全差示光度法快速测定矿石中银的新方法。该法简单快速,准确度高,选择性好,易于操作,适用于野外和中小型矿山化验室快速测定矿石中的银。  相似文献   

孔压触探测试中探头饱和问题的探讨   总被引：2，自引：0，他引：2  

孟高头  马淑芝 《水文地质工程地质》1998,25(3):50-52

孔压触探（ＣＰＴＵ）作为一种新型土体原位测试技术,日益引起人们的重视和推广,但ＣＰＴＵ测试中的一些技术环节尚需进一步探索和规范。本文对严重影响ＣＰＴＵ测试结果精度的探头饱和问题进行了探讨,指出探头饱和的重要性、一般方法、注意事项及检验措施。  相似文献   

一组锑-铋硫盐矿物共生组合及合成辉铁锑矿-硫锑铋铁矿系列的实验研究   总被引：1，自引：0，他引：1  

李九玲  张桂兰  亓锋 《矿物学报》1998,(2)

本文在研究广西大厂矿田产出的一组细密交生的锑-铋硫盐矿物共生组合基础上进行了矿物合成及元素代换实验。成功地合成了硫锑铋铁矿并确认了锑-铋不完全代换报成的辉铁锑矿-硫锑铋铁矿系列。  相似文献   

Geochemistry of Jinman Copper Vein Deposit West Yunnan province,China—Ⅱ.Fluid Inclusion and Stable Isotope Geochemical Characteristics   总被引：1，自引：0，他引：1  

Ji Hongbing  Li Chaoyang 《中国地球化学学报》1998,17(1):81-90

The Jinman deposit is a Ag-bearing copper vein deposit located at the north margin of the Lanping-Simao back-arc basin in West Yunnan. Systematic studies of fluid inclusions and stable isotopes are presented in this paper. The filling-replacement stage and the boiling-exhalative precipitation stage of mineralization took place atT ₁ = 140–280°3 andT ₂ = 94–204°C under pressure of (600 – 1200) x 10⁵ Pa. The salinity of ore-forming solutions ranges from 5 wt% –20.8 wt% (NaCl). Sulphide δ³⁴S(CDT) values are in the range of -9.6%.– +11.03%. with a range of 22. 66%. showing an apparent “pagoda”-shaped distribution in histogram. Meanwhile, the δ³⁴S values of the various sulphides are consistent with the characters of isotope equilibrium fractionation, i.e., δ³⁴ S_Py>δ³⁴S_Cp>δ³⁴S_Bn. The TS/TOC ratios of the ores are widely variable between 0.16 and 5.54 with no correlation of any kind can be established. According to the model of Ohmoto, the oxidation-reduction ratios of sulfur species in ore-forming solutions at the two mineralization stages were calculated to be R′₁ = 2.16 x 10^-17 and R′₂ = 1.55 x 10⁴. δ¹³Coo₂(PDB) values obtained from fluid inclusions in calcite and quartz are between -8.12%.-3.18%., averaging -5.26%., which are comparable with the isotopic composition of mantle-derived CO₂. Inclusions in quartz yield δ¹³CCH₄ (PEB) between -32. 11%. and -22.04%. (averaging -26.69%.), similar to that of methane in modern geothermal gases. For the ore-forming solutions, δ¹⁸ OH₂O (SMOW) values are between -10.57%. and +9.77%. and δDH₂O (SMOW) are between -51%. and -135%. Considering the effect of isotope exchange during water-rock reactions, most of the data are plotted along or close to the line defined by the reaction of meteoric water with clastic rocks, while a small part of the points fall near the reaction line of magmatic water with clastic rocks. In δ¹³C vs. δ18O diagram, the ore-forming solutions are plotted for the most part into the mixing area between the meteoric fluid and the deep-seated fluid and partially on the mixing line of P = 1. This project was founded by the “Eighth Five-Year Plan Period” State Key Program (85–901) and the Open Lab. of Ore Deposit Geochemistry, Chinese Academy of Sciences.  相似文献   

温室气体家族再添新成员     

《海洋世界》2009,(4):7-7

继二氧化碳、甲烷等温室气体之后，科学家又发现了另一种有强烈温室效应的气体——硫酰氟。硫酰氟是熏蒸工业上使用的一种重要消毒气体，用来杀死害虫、细菌和其他有害生物。最初，硫酰氟作为溴化甲烷的替代品进入熏蒸工业。溴化甲烷曾经是一种应用十分广泛的熏蒸消毒剂，但因其对臭氧层的破坏作用而逐渐淡出熏蒸工业。现在，“替代者”硫酰氟也有了麻烦。研究发现，硫酰氟在大气中的寿命可长达36年，比想象中长得多；另外，虽然目前大气中硫酰氟的数量非常之少（其所占比例约为万亿分之15，并且每年增加5％），  相似文献   

Seasonal variations of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) in the sea-surface microlayer and subsurface water of Jiaozhou Bay and its adjacent area   总被引：1，自引：0，他引：1  

ZHANG Honghai  YANG Guipeng  LIU Chunying  LI Chenxuan 《海洋学报(英文版)》2009,28(2):73-86

The distributions of DMS and its precursor dimethylsulfoniopropionate, in both dissolved (DMSP_d) and particulate fractions (DMSP_p) were determined in the seasurface microlayer and corresponding subsurface water of the Jiaozhou Bay, China and its adjacent area in May and August 2006. The concentrations of all these components showed a clear seasonal variation, with higher concentrations occurring in summer. This can be mainly attributed to the higher phytoplankton biomass observed in summer. Simultaneously, the enrichment extents of DMSP_d and DMSP_p in the microlayer also exhibited seasonal changes, with higher values in spring and lower ones in summer. Higher water temperature and stronger radiant intensity in summer can enhance their solubility and photochemical reaction in the microlayer water, reducing their enrichment factors (the ratio of concentration in the microlayer to that in the corresponding subsurface water). A statistically significant relationship was found between the microlayer and subsurface water concentrations of DMS, DMSP and chlorophyll a, demonstrating that the biogenic materials in the microlayer come primarily from the underlying water. Moreover, our data show that the concentrations of DMSP_p and DMS were significantly correlated with the levels of chlorophyll a, indicating that phytoplankton biomass might play an important role in controlling the distributions of biogenic sulfurs in the study area. The ratios of DMS/chlorophyll a and DMSP_p/chlorophyll a varied little from spring to summer, suggesting that there was no obvious change in the proportion of DMSP producers in the phytoplankton community. The mean sea-to-air flux of DMS from the study area was estimated to be 5.70 μmol/(m²·d), which highlights the effects of human impacts on DMS emission.  相似文献   

煤中硫的作用     

李昭容  肖金成  彭乔林 《国土资源导刊(湖南)》2008,5(3)

煤中的硫通常呈有机硫和无机硫的方式存在,笔者利用理论方法、化学反应方程式、计算公式和实例阐述了煤中硫的存在方式与含量对评价煤的工业用途、计算煤的发热量、分析煤的沉积环境等方面的指导作用。  相似文献