Geodynamic constraints on orebody localization in the Anqing orefield, China: Computational modeling and facilitating predictive exploration of deep deposits   总被引：1，自引：0，他引：1  

Liangming Liu  Changlin Wan  Chongbin Zhao  Yilai Zhao 《Ore Geology Reviews》2011,43(1):249-263

The Anqing Fe–Cu skarn deposit, with an age of 134 to 142 Ma and resources of 62.4 Mt at 0.906% Cu and 32.2% Fe, is one of the most important deposits in the Yangtze River Metallogenic Belt, East China. To better understand the localization of orebodies and thus facilitate predictive exploration of deep orebodies, computational modeling is used to simulate the coupled geodynamic processes during the syn-tectonic cooling of the ore-related intrusion, based on geological and geophysical investigations in the Anqing orefield.The occurrences of the ore veins and veinlets in diorite and skarn, as well as the sharp zigzag boundary of the orebody, indicate that the Cu ores were deposited after the solidification of the diorite and skarn formation, and were located in some tensional structural spaces that are unevenly distributed along the contact zone between the felsic intrusion and sedimentary carbonates. The locations of orebodies are closely associated with the contact zone shape. The computational results of two models with two typical contact-shapes show that pore fluid flow was focused into the dilation zones from different sources. All the significant dilation zones, in which the existing orebodies were located, are distributed in some specific places of the south contact zone of the intrusion. In addition, these dilation zones are closely related to the contact zone shape of the intrusion and can control the location of orebodies through the coupled mechano-thermo-hydrological processes during cooling of the intrusion in the extension setting. The skarns are not critical for controlling the localization of orebodies. This means that exploration for deep ore should target deep dilation zones close to the contact boundary of the intrusion. Such recognition may provide a useful guide in selecting exploration targets in the Anqing orefield. As a direct result of computational modeling, an orebody has been discovered in the deep dilation zone in this orefield. It demonstrates that computational modeling is a promising tool for understanding the metallogenic processes and for facilitating the deep exploration of hidden orebodies that are related to intrusions.  相似文献   

复方化学消毒剂中苯扎氯铵的高效液相色谱测定   总被引：1，自引：0，他引：1  

刘雯雯  张瑾  乔俊琴  练鸿振 《岩矿测试》2011,30(6):677-682

建立了一种测定复方化学消毒剂中苯扎氯铵成分十二烷基二甲基苄基氯化铵、十四烷基二甲基苄基氯化铵和十六烷基二甲基苄基氯化铵的反相离子对高效液相色谱法。色谱柱为Platisil ODS(5μm,250 mm×4.6mm),流动相为甲醇-0.2 mol/L己烷磺酸钠(含1%三乙胺,V/V,用高氯酸调节至pH=6.0,体积比85∶15),紫外220 nm检测。用己烷磺酸钠作为离子对试剂,增强了苯扎氯铵成分的保留,三乙胺作为扫尾剂,通过抑制固定相表面残存的硅羟基对苯扎氯铵成分的吸附,减少了色谱峰拖尾。3种苯扎氯铵成分分离良好,标准曲线的线性范围分别为0.002～5 mg/mL、0.005～10 mg/mL和0.005～10 mg/mL,检测限分别为0.0005 mg/mL、0.001mg/mL和0.001 mg/mL。方法具有良好的准确度和精密度,在测定低浓度样品时优势明显。实际用于测定苯扎氯铵消毒液和医用消毒纸巾中3种苯扎氯铵成分的含量,回收率为99.3%～104.1%,日内和日间测定相对标准偏差(RSD)均小于2.0%。  相似文献   

大兴安岭岩石圈地幔特征——哈拉哈河-绰尔河橄榄岩捕虏体的证据   总被引：6，自引：4，他引：2  

赵勇伟  樊祺诚 《岩石学报》2011,27(10):2833-2841

大兴安岭哈拉哈河-绰尔河第四纪火山岩中含有尖晶石相和石榴石相橄榄岩捕虏体.本文报道的尖晶石相橄榄岩包括方辉橄榄岩和二辉橄榄岩两类,前者分布数量略高于后者.方辉橄榄岩多数具有较高的平衡温度(1072～1193℃),矿物化学成分变化大,含有高Mg橄榄石和高Cr#尖晶石,这些特征一致表明是古老岩石圈地幔残余的样品.而二辉橄榄岩显示相对均一的矿物化学成分和很宽的平衡温度变化范围(636～1178℃),代表了明显受到改造的岩石圈地幔,可能反映岩石圈地幔的不同深度和局部经历了软流圈与岩石圈相互作用.通过与华北克拉通的对比,发现地处兴蒙造山带的大兴安岭岩石圈地幔中仍保留有相当量的古老岩石圈地幔残余,区别于遭受强烈改造和破坏的华北克拉通东部地区的岩石圈地幔.  相似文献   

高浓度化学浆液的研制与应用效果          下载免费PDF全文

朱效中  朱学光 《探矿工程》2011,38(10):60-62

淮北某煤矿因第四含水层水量过大,通过F5断层导入采煤工作面,使采煤生产陷入停顿。为解决采煤工作面涌水量过大问题,研制了高浓度化学浆液,经钻孔注浆收到良好的止水效果,使近200万t煤炭资源恢复开采,取得了很好的经济和社会效益。  相似文献   

藏南拉木由塔锑(金)矿床S、Pb同位素组成及指示意义   总被引：1，自引：1，他引：0  

杜泽忠  顾雪祥  李关清  章永梅  程文斌  景亮兵  张兴国 《现代地质》2011,25(5):853-860

西藏拉木由塔锑(金)矿床位于藏南Sb - Au成矿带东段,矿(化)体主要赋存于中侏罗统遮拉组地层与辉绿(玢)岩脉接触带上.在分析该矿床成矿地质条件的基础上,系统研究了矿石硫、铅同位素组成特征,并通过与区域成矿带中典型矿床硫、铅同位素组成的对比分析,探讨了矿床成矿物质来源.研究表明矿石硫化物的硫同位素组成变化范围较窄,成...  相似文献   

拉萨市夏季大气降尘单颗粒矿物组成及其形貌特征   总被引：3，自引：0，他引：3       下载免费PDF全文

张学磊  邬光剑  岳雅慧  张成龙 《岩石矿物学杂志》2011,30(1):127-134

应用带能谱的电子扫描电镜(SEM-EDX)对拉萨市夏季正常天气下收集的大气自然沉降气溶胶样品进行分析,研究了拉萨市大气降尘矿物组成和各种物相形貌特征信息。拉萨市大气颗粒物含有硅酸盐颗粒、富钙颗粒、富铁颗粒、富碳颗粒(燃煤飞灰颗粒和燃油飞灰颗粒)和植物残体颗粒。根据颗粒物数量统计发现拉萨市大气颗粒物以硅酸盐颗粒为主,富钙颗粒和富铁颗粒次之,需要指出的是以燃油飞灰为主的富碳颗粒已占到一定比重,说明以燃油为主的机动车尾气对拉萨大气污染在加强。研究结果表明,大气降尘矿物成分及其形貌特征可以用作判定污染物来源的重要标志,拉萨大气中颗粒来源的多样性决定了治理措施也应综合进行。  相似文献   

滴西12井区储集层伤害机理研究及防膨效果评价     

冷严  吴运强  殷新花  阿达莱提  宋志理  王兰芬 《新疆地质》2011,29(4):466-469

针对滴西12井区勘探开发中可能存在的储层伤害问题,通过开展储层敏感性特征、注水适应性评价及防膨稳定剂效果评价等综合研究,结合该区块储层具体情况,明确现场注水伤害类型及程度,推出相对合适、匹配、经济实用的防膨稳定剂,减小注水开发过程中储层敏感性伤害,增强注水开发效果,从而达到高效、合理开发滴西12井区油藏目的.  相似文献   

Correlation of main physicochemical parameters of some groundwater in northern Serbia     

Sanja Mrazovac  Mirjana Vojinović-Miloradov 《Journal of Geochemical Exploration》2011

The geothermal waters of the first and the shallowest groundwater system of the Province of Vojvodina in northern Serbia, south part of the Pannonian Basin, are characterized by elevated temperatures (between 25 and 85 °C) and elevated gas content (above 1 Nm³/m³) with a high methane content (average about 94% of total gases). These methane-containing waters are particularly abundant in the Central part of the province between Danube and Tisa rivers. Dominant ions in these waters are sodium and bicarbonate, but the waters also contain significant amounts of calcium, magnesium, potassium, chloride, and ammonium. Components that are of balneological significance include iodine, bromine, fluorine, strontium, lithium, barium, and metasilicic and metaboric acids. Based on statistical analysis, a strong positive correlation is generally observed in about 9.2% cases. A slightly lower correlation appears in about 42.2%, and negative correlation coefficient appears in about 48.6% cases. The dendrogram of the cluster analysis built on the wells shows three main groups. There is the cluster of (Na⁺)_aq, (Cl⁻)_aq and (HCO₃⁻)_aq. The second aggregation is (NH₄⁺)_aq/(NH₃)_aq. The third group includes (Mg²⁺)_aq, (Ca²⁺)_aq, (Fe³⁺)_aq, (Sr²⁺)_aq, (Pb²⁺)_aq, and (Zn²⁺)_aq.  相似文献   

Downstream patterns of bed sediment-borne metals,minerals and organic matter in a stream system receiving acidic mine effluent: A preliminary study   总被引：1，自引：0，他引：1  

Yingqun Ma  Wenzhou Lu  Chuxia Lin 《Journal of Geochemical Exploration》2011

Different downstream variation patterns were observed for a range of bed sediment-borne metals (aqua regia-extractable fraction) in a subtropical stream system receiving acid mine drainage. Mine-originated Fe tended to be deposited in the acidic (mean pH < 4.9) upstream reach in forms of goethite and/or hematite. In contrast, other metals tended to be transported farther downstream and settled in a low-gradient reach with high pH (mean pH > 5.6). The peak of sediment-borne Al, Be, Ca, Cd, Co, Cu, La, Mn, Ni and Zn corresponded very well with the peak of the sediment-borne organic matter, suggesting a close association between the water-borne organic colloids and the inorganic metal oxides/hydroxides during their transport. The marked increase in the sediment-borne Al and Pb started more upstream than the other metals, suggesting that the water-borne Al and Pb were more susceptible to pH rise-induced precipitation, as compared to the other metals. It appeared that the organic colloids played no important role in Pb transport and settlement. The iron precipitates had a limited role to play in affecting the transport and fates of other metals since they were predominantly formed and deposited in the acidic reach, which made them incapable of scavenging cationic metals by co-precipitation or adsorption.  相似文献   

安徽铜山矿区花岗闪长斑岩矿物化学 特征及成因探讨     

李大鹏 《地质与勘探》2011,47(5):865-875

由于前人对与安徽铜山铜矿床成矿关系密切的花岗闪长斑岩的矿物化学成分变异机制研究较为欠缺,本文对其进行了详细的矿物化学分析,并结合前人获得的岩石化学资料进行了研究,结果表明,岩体中黑云母具有富MgO(13.13%～17.19%)、FeOT(15.33%～17.42%),贫Al2O3(13.27%～13.74%)、高TiO2(3.11%～4.66%)的特点,其MF值为0.57～0.66,Fe/(Fe+Mg)值为0.48～0.57,主要为金云母;角闪石具有高FeOT(13.50%～15.33%)和Al2 O3(6.26%～13.74%)、低SiO2(36.21%～46.91%)的特点,主要为镁质角闪石;辉石中的Al2 O3的含量变化较大(0.17%～1.08%),Na2 O含量普遍较低。黑云母、角闪石和辉石特征表明,铜山花岗闪长斑岩的母岩浆属于亚碱性系列的壳幔混染型岩浆,它们形成于造山作用晚期,并有向非造山环境过渡的趋势。利用黑云母-角闪石温压计得出成岩温度为750～900℃,成岩压力为3.2×108～4×108Pa,相应的成岩深度约为10.56～13.2 km;利用黑云母Fe3+-Fe2+-Mg三元图解,显示了相对较高的氧逸度;另外,相比于长江中下游其它侵入岩,铜山花岗闪长斑岩具有成岩深度较深,氧逸度相对较低的特点。  相似文献