溶液介质条件对重金属离子与石英表面反应的影响

实验研究表明,随着溶液ＰＨ值的升高石芟夺Ｃｕ＾２＋、Ｐｂ＾２＿、Ｃｄ＾２＋等重金属离子的吸附量和表面吸附覆盖率逐渐增大,而表面反应产物的结合开矿相应地出现由单核化合物、多核化合物〖ＳＯＣｕ４（ＯＨ）３＾４＋〗,直至表面沉淀（ＳＯＨ…Ｃｕ（ＯＨ）２（ｓ）〗。随着温度升高,石英对Ｃｕ＾２＋、Ｐｂ＾２＋、Ｃｄ＾２＋等重金属离子的吸附量逐渐减是随着溶液离子强度的增大,石英对Ｃｕ＾２＋离子的吸附量和表面离了     

铅在高岭石表面的吸附模式

采用表面络合模式,研究了高岭石表面的酸碱性质以及高岭石表面对铅的吸附行为。结果表明,高岭石表面在不同ｐＨ条件下对质子和铅离子的吸附反应可以用单一表面基团、无静电表面络合模式来描述。高岭石表面酸度常数拟合值分别为ｐＫａ１＝２．７５和ｐＫａ２＝５．５２,电荷零点ｐＨｚｐｃ＝４．１铅在高岭石表面的吸附量随ｐＨ值的升高而增加,吸附铅的两种表面化合态〉ＳＯＰｂ＾＋和〉ＳＯＰｂＯＨ的浓度也随ｐＨ值的变化而变化     

热液体系中Si的络合作用

在不同温度、ＰＨ和硅浓度条件下,实验标定了Ａｕ－ＳｉＯ以及Ｓｎ－ＳｉＯ２之间的络合反应：Ａｕ＾＋＋Ｈ３ＳｉＯ４＾－之间的络合反应：Ａｕ＾＋＋Ｈ４ＳｉＯ＝ＡｕＨ３ＳｉＯ４ ｌｇＫ＝－１．６５４３６＋９６１１．２１／Ｔ;Ｓｎ＾４＋＋４Ｈ３ＳｉＯ４＾－＝Ｓｎ（Ｈ３ＳｉＯ４）４;ｌｇＫ２００ｃ＝４２．７３。通过与Ａｕ－Ｃｌ、Ａｕ－ＨＳ以及Ｓｎ－ＯＨ络合物迁移能力的比较,表明在具地质意义的Ｐ睡ＥＨ条件下,Ａ     

重金属离子与石英表面反应的实验研究

石英对Ｃｕ＾２＋,Ｐｂ６２＋,Ｚｎ＾２＋,Ｃｄ＾２＋,和Ｎｉ６２＋等二价重金属离子的吸附等温线研究表明,石英对重金属离子的吸附反应可用Ｆｒｅｕｄｌｉｃｈ方程很好地进行描述,拟合曲线相关系数〉０．９６,吸附反应以形成金属离子单配位形态为主,只是Ｃｕ＾２＋,Ｚｎ＾２＋和Ｎｉ＾２＋等三种离子有一部分双配位形态生成。同时,利用表面配位理论模式对实验结果进行拟合,其结果为表观表面配位常数ｌｇＫＭ＝２．２－３     

沉积CaCO3与金属离子界面反应动力学研究

金属离子与沉积碳酸盐之间２同反应动力学模拟实验表明,由于ＣａＣＯ３快速溶解和溶液ＰＨ急剧上升,大部分Ｐｂ＾２＋、Ｚｎ＾２＋离子与溶液中ＣＯ３＾２－和ＯＨ＾－离子反应生成白铅矿ＰｂＣＯ３、水白铅矿Ｐｂ３（ＯＨ）２（ＣＯ３）２,或Ｚｎ（ＯＨ）３和锌矿Ｚｎ（ＯＨ）６（ＣＯ３）２沉淀于体相溶液中,仅有少部分Ｐｂ＾２＋、Ｚｎ＾２＋通过扩散与ＣａＣＯ３表面发生离子交换反应。２５℃时,Ｐｂ＾２＋溶液中以白铅矿沉     

安徽月山矿成矿流体中铜,金的迁移形式和沉淀的物理化学条件

文章基于矿床地质特征和地球化学热力学理论,计算和讨论了安微月山矽卡岩－热液型铜,金矿田成矿流体中成矿物质的迁移形式和沉淀的物理化学条件,两类矿床的主要成矿阶段,成矿流体中铜主要以氯络合物ＣｕＣｌ、ＣｕＣｌ２＾－、ＣｕＣｌ＾２－３,ＣｕＣｌＯＨ,金主要以硫的络合物Ａｕ２（ＨＳ）２Ｓ＾２－,Ａｕ（ＨＳ）２＾－,ＡｕＨＳ、ＡｕＨ３ＳｉＯ４等形式进行迁移,成矿流体中铜沉淀的主要物化条件是降温及氯离子浓度的     

胶东台上金矿成矿机制模拟实验研究

模拟实验研究表明，台上金矿床的成矿机制为：胶东群地层重熔形成滦家河花岗岩岩浆时，初始浆为几乎均匀的熔体相；随着结晶成岩作用的进行，由于局部岩浆结晶分异作用，产生富Ｋ＾＋，Ｎａ＾２＾＋，Ｃａ＾２＾＋，Ｍｇ＾２＾＋，Ｆ＾－，Ｃｌ＾－，Ｓ＾２＾－，ＣＯ３＾２＾－及挥发份ＣＯ２，ＣＯ，Ｈ２Ｏ等的流体相，并不断从已结晶矿物及残熔体中，以［Ａｕ（ＨＳ）２］＾－，［Ａｕ（ＨＳ）Ｓ］＾２＾－，ＡｕＣｌ４］＾－等络     

重金属离子与方解石表面反应的实验研究

本文对重金属离子与方解石表面反应作了系统研究。方解石表面对重金属离子的吸附等温线可分为４种类型：Ａ型,Ｌａｎｇｍｕｉｒ型;Ｂ型,Ｆｒｅｎｄｉｃｈ型;Ｃ型,吸附－沉淀突变型;Ｄ型,吸着线性型。实验研究表明,方解石表面反应多种模式并存。Ｃｕ＾２＋、Ｚｎ＾２＋、Ｃｄ＾２＋和Ｎｉ＾２＋在低浓度时表面为离子交换吸附。较高浓度时表现为交换和表面配位吸附并存,而高浓度时则表现为表面沉淀;Ａｇ＾＋Ｐｂ＾２＋、Ｃｒ     

东坪金矿床的围岩蚀变和流体特征

东坪金矿床围岩蚀变特征、流体包裹体特征与氢氧同位素特征研究表明，成矿流体富集Ｋ＾＋，Ｎａ＾＋，Ａｕ＾＋，Ｃｌ＾－和ＣＯ２、Ｈ２Ｓ成矿溶液以岩浆热液为主，但有天水的混合。金在溶液中以Ａｕ（ＨＳ）＾－２和ＡｕＣｌ＾－２形式存在，构造活动引起的压力突变和流岩反应是引起金沉淀的主要因素。     

麦饭石在腐殖酸及重金属离子的吸附作用

研究了麦饭石对腐殖酸和重金属离子（Ｈｇ＾２＋,Ｐｂ＾２＋,Ｃｕ＾２＋,Ｚｎ＾２＋,Ｃｄ＾２＋）的吸附作用,实验结果表明麦饭石对腐殖酸和重金属离子都具有较好的吸附性能,且腐殖酸的存在有利于麦饭石对重金属离子的吸附,ｐＨ值是影响吸附的重要因素,当ｐＨ值５．０～６．０时,麦饭石同时吸附腐殖酸和重金属离子的效果最好,麦饭石在吸附腐殖酸和重金属离子的同时能溶出微量元素硒,这对于大骨节病的防治有得要意义。     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931.     

PALEONTOLOGY

正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.)     

GEOCHEMICAL EXPLORATION

正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.)     

MICROPALAEONTOLOGY

正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.)     

PETROLOGY

正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus.,     

ENVIRONMENTAL GEOLOGY

正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an     

PROSPECTING EXPLORATION

正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of     

OCEANOGRAPHY & MARINE GEOLOGY

正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37     

ENVIRONMENTAL GEOLOGY

正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.)