山东玲珑九曲金矿床地质特征及流体包裹体研究

山东玲珑九曲金矿床位于金矿田的东部,属石英脉--蚀变岩型金矿床,矿化分为4 个阶段,黄铁矿--石英脉阶段,石英--黄铁矿阶段,多金属硫化物阶段和石英--碳酸盐阶段。流体包裹体研究表明,九曲金矿床主成矿阶段石英中发育气液两相和含CO2 三相包裹体,也可见少量的富气相包裹体。气液两相包裹体均一温度范围为133. 5 ℃ ～ 325. 7 ℃,峰值为290 ℃ ～ 310 ℃,盐度为2. 80% ～ 17. 82% NaCl; 含CO2 三相包裹体均一温度范围为236. 5 ℃ ～ 315 ℃,出现两个峰值,为230 ℃ ～ 240 ℃和310 ℃ ～ 320 ℃,盐度为0. 41% ～ 8. 92%NaCl; 富气相包裹体均一温度范围为222. 1 ℃ ～ 236. 4 ℃,峰值为230 ℃ ～ 240 ℃,盐度为7. 71% ～ 9. 98%NaCl。综合地质条件、矿床特征和包裹体显微测温结果认为: 九曲金矿床成矿流体为中温、中低盐度的NaCl --H2O --CO2 型体系,矿床属中温岩浆热液成因类型。     

贵州大厂锑矿有机质与有机成矿作用

用有机地球化学方法对矿区与右江盆地有机质的分析研究表明，容矿的大厂层有机碳与锑含量相对较高；有机包裹体主要是气态烃包裹体与沥青包裹体，在气态烃包裹体中含0％～30％的液态烃，发暗黄色荧光；有机气相成分中四种烷烃甲烷、乙烷、丙烷、丁烷均有显示；从主成矿期萤石中的沥青及右江盆地再沉积火山碎屑岩中的干酪根的生物标志物测定结果来看，二者在正烷烃、类异戊二烯烷烃、萜烷与甾烷标志物特征上较为接近，表明右江盆地沉积物中的有机质与锑矿中的有机质有亲缘关系。模拟实验证明原油对锑有较强的萃取迁移能力；而有机质在锑成矿过程中主要起三方面的作用：淋滤、萃取迁移及还原沉淀。     

滇中郝家河砂岩型铜矿床成矿作用过程的流体包裹体证据

通过对牟定郝家河砂岩型铜矿床的不同结构构造及矿化类型岩石中矿物包裹体特征的研究及对比,认为不同结构构造及矿化类型岩石的形成与不同成岩-成矿阶段流体的演化特点密切相关。流体包裹体测温数据表明其成矿作用主要经历3个成矿流体演化阶段:成岩期(均一温度:84℃~162℃)、主改造期(均一温度:145℃~227℃)及次改造期(均一温度:129℃~177℃)。3期流体的盐度变化不大,多处于4%~10%之间,而它们的气相成分主要为H2O,其次为CH4和CO2。成岩期流体演化形成了砂岩铜矿的初始矿源层及贫矿体,矿化程度高的地方甚至形成浸染状或纹层状矿石;改造-成矿期的流体则在原来基础上进一步演化形成现今受构造控制的条带状、脉状富矿体。     

泥岩有水热解产生低分子量有机酸实验研究

直接采用泥岩岩屑进行有水热解,测定实验后水溶液中几种常见低分子量有机酸.结果表明,在实验的水溶液中检测到了丰富的低分子量有机酸,组成上主要为一元羧酸,其中又以乙酸占优势.讨论了不同热解条件对有机酸产率以及组成的影响.实验结果表明,有机酸总量随加热温度和时间增加而增加,并且溶液中不同有机酸相对组成也发生变化.当温度高于1...     

东川汤丹铜矿床石英真空击碎及其粉末阶段加热^40Ar—^39Ar年龄谱的含义

采用真空击碎技术提取东川汤丹铜矿床石英流体包裹体进行40Ar-39Ar法年龄测定,获得了逐渐下降的阶梯形年龄谱,表明流体包裹体含有过剩氩;数据点在40Ar／36Ar-39Ar／36Ar图解上构成等时线,等时线年龄为（712±33）Ma,代表了矿床的形成年龄。随后对其粉末进行40Ar-39Ar阶段加热（100—800℃）分析,形成相对比较平坦的年龄谱,坪年龄为（317±6）Ma（39Ar占45％,含真空击碎分析在内）,粉末加热分析全部数据点构成的等时线年龄为（321±13）Ma。电子探针分析和显微镜观察证实了该石英样品中含有粒径大于100μm,K2O含量为8％-10％,形成时间明显晚于石英的白云母类富钾矿物,粉末阶段加热分析结果表明～320Ma应为后期白云母类矿物的年龄。     

Hydrocarbon Inclusion Characteristics in the Cambrian-Ordovician Carbonates of the TS2 Well: Implication for Deep Hydrocarbon Exploration in the Tahe Oilfield,Tarim Basin,Northwest China

Going deep has been the strategy for the sustainable development of the Tahe Oilfield.Following the TS1 well in block 1,which revealed excellent combinations of hydrocarbon generation,migration and accumulation in the deeper parts of the Tarim Basin,the TS2 well was drilled to learn more about the prospectivity in the deeper parts of the main blocks of the Tahe Oilfield.Seventeen core samples were collected to perform fluid inclusion studies,including petrography,fluorescence microspectrometry,and microthermometry.The results show that the deeper parts of the Tahe Oilfield have a good hydrocarbon potential.The Cambrian source rocks can supply sufficient oil for not only the Cambrian reservoirs,but also for the Lower Ordovician reservoirs.The CambrianOrdovician carbonates reservoirs experienced at least three oil charging events and one late gas charging event.Oil accumulations formed in the early stage of basin evolution were likely destroyed in the late stage with deep burial,tectonic movements,or invasion of hydrothermal fluids.Therefore,the deep hydrocarbon exploration of the Tahe Oilfield,even the whole Tarim Basin,should focus on gas accumulations,although oil accumulations,especially in Cambrian reservoirs,cannot be neglected.     

金岭寺—羊山盆地北票组烃源岩特征

通过对采集的岩样进行地球化学综合分析,得出金羊盆地北票组为盆地主要烃源岩,为盆地油气生成提供了物质基础;北票组烃源岩有机质丰度不高,属差一中等烃源岩;干酪根类型以腐殖型为主,成烃母质为陆地高等植物：金羊盆地北票组烃源岩已经进入成烃门限．并处于成熟阶段中的低成熟到中成熟阶段。     

Temperature and pH Dependence of Some Metals Leaching from Fly Ash of Municipal Solid Waste

Abstract. Municipal solid waste combustion leads to concentration of various metals in the solid residue (fly ash) remaining after combustion. These metals pose serious environmental hazard and require proper handling and monitoring in order to control their harmful effects. Leachability of some metals from fly ash was examined in fly ash and Milli-Q water mixture (liquid-to-solid ratio, 100) under various temperature and pH conditions in the laboratory. The leaching experiments conducted for 24 hours showed that pH was generally more important than temperature in controlling the amount of metals leached out of the fly ash. However, at a given pH, rise in temperature led to different degree of (usually one to two fold) enhanced or reduced leaching of metals. Owing to amphoteric nature of oxides of Al, Cr, Pb and Zn, these metals often yielded typical pattern of increase and decrease in their concentrations with change in pH. The extent of leaching of Cr and Pb in our experiments suggests that decrease of pH to acidic range in the case of Pb and to neutral to acidic range for Cr over a long period of storage of fly ash at solid waste dumping site may facilitate leaching of these metals from fly ash, leading to contamination of groundwater to the level that exceeds beyond the level permitted by the environmental laws.     

Fluid unmixing/immiscibility as an ore-forming process in the giant REE–Nb–Fe deposit, Inner Mongolian, China: Evidence from fluid inclusions

The giant Bayan Obo REE–Nb–Fe deposit consists of replacement bodies hosted in dolomite marble made up of magnetite, REE fluorocarbonates, fluorite, aegirine, amphibole, calcite and barite. Two or three phase CO₂-rich, three phase hypersaline liquid–vapor–solid, and two phase liquid-rich inclusions have been recognized in mineralized fluorite and quartz samples. Microthermometry measurements indicate that the carbonic phase in CO₂-rich inclusions is nearly pure CO₂. Fluids involving in REE–Nb–Fe mineralization at Bayan Obo might be mainly of H₂O–CO₂–NaCl–(F–REE) system. Coexistences of brine inclusions and CO₂-rich inclusions with similar homogenization temperatures give evidence that immiscibility happened during REE mineralization. An unmixing of an original H₂O–CO₂–NaCl fluid probably derived from carbonatitic magma. The presence of REE-carbonates as an abundant solid in fluid inclusions shows that the original ore-forming fluids are very rich in REE, and therefore, have the potential to produce economic REE ores at Bayan Obo.