Strontium isotopic signature of hydrothermal sedimentation from Early Cambrian barite deposits in east Guizhou,China

The ore genesis model for barite deposits in east Guizhou Province has been in dispute and the major debate focuses on whether they are product of the submarine hydrothermal sedimentation. This note presents new strontium isotope data from 19 samples of Dahebian and Yuping barite deposits, and their ^87Sr/^86Sr ratios are significantly lower than that of the coeval seawater. The ^87Sr/^86Sr ratios of 17 samples out of 19 samples rang from 0.708310 to 0.708967, indicating that they might be related to the mantel admixture. Two isotopic ratios in this study are higher than those of coeval seawater (0.7090), collected from late-stage barite mineral vein of interpenetrative strata and a barite nodule bearing hypidiomorphic granular pyrite, which indicates that they might be related to the continental admixture. The study provides Sr isotopic evidence not only for the submarine hydrothermal exhalative genesis of Dahebian and Yuping barite deposits, but also for distinguishing the barite mineralization of late stage.     

渗碳工艺的微机控制

笔者采用8031单片机为核心,设计研制了渗碳微机控制系统,用氧探头作为传感器,微流量电磁阀作为渗剂供给执行机构,组成炉气氛碳势模糊控制串级调节系统,解决了以往碳势控制回路中控制稳定性差的缺点。     

无机受载试剂氯化硅胶研究

用四氯化碳与硅胶在４００￣４５０℃、６６６６１．２￣７９９９３．４Ｐａ压力下在设计的氯化反应器中反应６０￣８０ｍｉｎ得到较理想的氯化硅胶，制得的氯化硅胶具有良好的受载能力，氯化反应器法比封管法更好更适用。     

甘肃白银矿田典型矿床成因研究

白银矿田的成岩成矿环境为早-中寒武世北祁连裂谷;白银矿田的火山喷发旋回由早→晚为细碧岩-角斑岩-石英角斑岩,含矿火山岩地层为石英斑岩类的石英角斑凝灰岩,层位控制明显;成矿物质主要来源于上地幔;成岩温度850°-1150℃,成矿温度由高→中温.     

水溶法开采吴城天然碱矿的模拟试验

吴城天然碱矿水溶开采模拟试验证明,采用双井对流采矿,孔道位置是影响总碱采出率的主要因素.孔道在碱层下部时。总碱采出率最高.若在碱层中、上部形成水的通道,或天然碱层之上覆盖盐岩层时.采用注气控制顶溶,以防顶扳过早坍塌.既可提高总碱采出率,又可达到盐碱分层采出,为采出液的分离加工提供方便.     

近水平矿床露天矿采区的过渡方式

在分析研究了常用的采区过渡方式及特点基础上，结合霍林河南露天矿实例，对不同的过渡方式作了相关的技术经济分析，得出了具有普遍意义的结论     

Ca-efflux,from direct membrane injury by CCl4, is elicited by amphiphilic vehicles in vitro

Direct membrane injury by CCl₄, in situations excluding metabolic activation, was evaluated in saponin-permeabilized hepatocytes and in microsomes by measuring immediate Ca²⁺ efflux. A good correlation appears between the Ca²⁺ efflux and the level of CCl₄ in the membrane and also the variations in fluidity. Mixtures of CCl₄ with water-soluble vehicles were used to improve the dispersion of CCl₄ in the medium. The mixtures varied in their ability to elicit the membrane effects of CCl₄. The performance of ethanol and, to a lesser degree, other alcohols, suggests the existence of a water stable structural organization between CCl₄ and these amphiphilic vehicles, facilitating the transfer of CCl₄ to the membrane.     

401矿区铀矿床地质地球化学特征及其地下堆浸评价

40 1矿区贫铀花岗岩成岩后经过三期水溶液流体的改造作用 :早期高温热液的碱交代作用使花岗岩中的铀活化转移 ,此活性铀是形成铀矿床的物质基础 ;中期中低温热液是沿断裂上升的深源富 CO2 流体与大气降水的混合产物 ,它浸出了花岗岩中的活性铀 ,并迁移至有利的断裂构造部位 ,富集成脉状热液铀矿床 ;晚期地表水沿控矿断裂向下渗滤 ,铀矿床遭受表生淋滤 ,其矿石的物理化学性质发生改变 ,为地下堆浸创造了有利条件     

形成最佳圈闭条件的探讨

本文以廊固凹陷为例,论述了凹陷的构造发展史,地层岩性变化,生油岩的发育情况,生油地化指标及水动力条件等。同时对廊固凹陷的最佳圈闭条件进行探讨和预测,提出有利的含油气地区及油气藏类型,为石油勘探提出了找油的新领域。     

Effects of -NO2 and -NH2 functional groups in mixed-linker Zr-based MOFs on gas adsorption of CO2 and CH4

This study was undertaken to evaluate the effects of mixing BDC-NO_2 and BDC-NH_2 linkers in the synthesis of Zrbased metal organic frameworks(Zr-MOFs) on their adsorption and separation of CO_2 and CH_4. Ui O-66 with single or binary-NO_2 and-NH2 samples were synthesized under solvothermal conditions and activated by solvent exchanging using methanol. Structural analyses of the materials were conducted using FTIR, XRD, TGA,SEM,1 HNMR and N2 adsorption/desorption techniques and adsorption of CO_2 and CH_4 at high pressures and different temperatures(273 and 298 K) was investigated. It was found that Ui O-66-NH2 exhibited higher CO_2 and CH_4 adsorption capacities than those of Ui O-66-NO_2. Addition of-NH_2 functional group in Ui O-66-NO_2 could enhance CO_2 and CH_4 adsorption due to the extra CO_2 adsorption sites of-NH_2 functional groups. Addition of-NO_2 functional group to Ui O-66-NH2 at a low loading could also increase CO_2 and CH_4 adsorption, however,a high loading of NO_2 functional group to Ui O-66-NH2 would result in decreased adsorption.