桐柏—大别地区中温热液金矿床同位素地球化学特征

本文收集整理了桐伯－大别地区与中温热液金矿床有关的氢，氧，硫，铅同位素组成数据，分析整理结果表明，成矿流体和成矿元素及硫可能来自不同的来源，流体主要为大气降水，成矿元素和硫主要来自流体下渗及回返过程中流经的各类岩石，成矿流体的这种性质对于造山内带及两侧金矿化的产出规律具有相当程度的影响。     

长江中下游中生代花岗岩类源区的壳—壳混源性质

长江中下游地区中生代花岗岩类形成于大别造山带碰撞后岩石圈物质的调整演化过程。Ｓｒ、Ｎｄ、Ｐｂ同位素组成数据表明，早、晚阶段花岗岩类具有相似的壳－壳混合源区性质，其主要源岩端员可能分别相当于以大别杂岩为代表的深变质岩系和中、新元古界底侵（ｕｎｄｅｒｐｌａｔｉｎｇ）基性物质与部分古元古界沉积－火山－侵入岩系组成的扬子陆块下地壳岩石。这两种成分不同的下地壳物质在这里呈指状穿插体结构。长江中下游地区下地壳在碰撞造山过程中曾是大别地块与扬子地块之间的深部构造混杂带。本文主要根据各类已有的Ｓｒ、Ｎｄ、Ｐｂ同位素组成资料讨论花岗岩类的源区性质问题     

广西栗木稀有金属花岗岩的稀土元素配分模式及其意义

本文探讨了栗木稀有金属花岗岩稀土元素配分模式的特点。含矿花岗岩和不含矿花岗岩含稀土总量均低,但其稀土配分模式差别甚大。该岩体可能是南岭地区由成分相当于翁岗岩浆的碱长花岗岩浆直接结晶形成的,而不是由正常花岗岩浆演化到晚期的残余岩浆结晶形成的。     

Control of Melt Structures on Cu-Au Mineralization in Basic-Ultrabasic Complexes of Northern China

Based on systematic analyses of 72 samples of different basic-ultrabasic rocks, the present paper discusses the relationship between melt structure and Cu and Au mineralization. It is found that if the NBO/T, NBO, M2+, FeO and MgO values are relatively high and the T, M3+, Fe2O3 and CaO values are low the basic-ultrabasic melt will be favourable to Cu (Ni) mineralization, but if the former are low and the latter are high it is favourable to Au metallization. Cu ions occupy dominantly octahedra in basic-ultrabasic melt and the higher the NBO/T, NBO and M2+ values, the more the octahedra in the melt. Au element mainly takes the form of Au+ ions in basic-ultrabasic melt and the Au+ ions constitute tetrahedral sites together with Fe3+ ions. Therefore, low M2+ and high Fe3+, i.e. high oxygen fu-gacity, can promote the enrichment of Au+ ions and Au mineralization. Components NT (other than Au+), Al2O3 and SiO2 in basic-ultrabasic melt have no effect on metallogenetic species. As mentioned above, in relevant d     

美国金属矿床和经济地质研究的展望

在过去３０年中美国科学家已经产生了一种倾向性看法，即认为金属矿床是大尺度地质作用的产物（例如板块构造和盆地卤水区域性迁移）．在这一时期内，矿业公司和科学家空前地致力于金矿床研究。除了国内金矿之外，他们还特别注意研究国外的矿床。流体包裹体、绝对年龄、稳定同位素研究、计算机模拟、遥感和地球物理方法已经成为广泛应用的技术手段。当今普遍研究的矿床课题范围很广泛：包括斑岩型矿床、密西西比盆地型矿床、金刚石岩管、深海块状硫化物矿床、含贵金属煤、矿化页岩和一些新矿床类型（例如奥林匹克坝型矿床，卡林型矿床和Ｎｉ－Ｍｏ－ＰＧＥ－Ａｕ硫化物矿床）。在未来十年内，有可能继续注意国外金属矿床和金矿的研究。新的重要矿床发现（尤其是在基底地体、海洋和国外）正拭目以待。与沉积盆地中流体的最近研究相比较，可以预料扩大环境研究也具有重要意义。与此同时，象类似于接受板块构造理论一样，地球深部创造性研究可以使矿床成因的理性认识有所突破。     

云南个旧矿集区区域构造-岩浆演化与锡铜多金属成矿系统

个旧矿集区是滇东南最重要的锡铜多金属矿产地之一, 形成了云英岩-石英脉型矿化、与矽卡岩化有关的锡石-硫化物型矿化、蚀变基性火山-次火山岩型矿化和与断裂有关的各种脉型矿化构成的锡铜多金属成矿系统.根据区域构造-岩浆演化与锡铜多金属矿化系统的配置关系研究, 认为燕山晚期复式花岗岩体侵位进入以中三叠统为主的碳酸盐岩地层组成的褶皱带中, 锡铜等金属元素的成矿富集产生于花岗岩体与围岩接触带及其附近发生的接触交代和更远处发生的交代-充填过程, 成矿元素主要源自燕山期中下部地壳物质熔融形成的花岗岩浆和印支期裂谷环境中来自地幔的玄武岩-辉绿岩-辉长岩类, 多期脉动式的岩浆活动驱动了一个长效的热液系统, 这些要素共同构筑了这一巨量的金属矿集区.由此建立了个旧矿集区的区域成矿模型, 并对进一步寻找新的矿化类型提出了理论线索.      

Anthropogenic metal contamination and sapropel imprints in deep Mediterranean sediments

Sediment cores from the deep Balearic basin and the Cretan Sea provide evidence for the accumulation of Cd, Pd and Zn in the top few centimeters of the abyssal Mediterranean sea-bottom. In both cores, 206Pb/207Pb profiles confirm this anthropogenic impact with less radiogenic imprints toward surface sediments. The similarity between excess 210Pb accumulated in the top core and the 210Pb flux suggests that top core metal inventories reasonably reflect long-term atmospheric deposition to the open Mediterranean. Pb inventory in the western core for the past 100 years represents 20-30% of sediment coastal inventories, suggesting that long-term atmospheric deposition determined from coastal areas has to be used cautiously for mass balance calculations in the open Mediterranean. In the deeper section of both cores, Al normalized trace metal profiles suggest diagenetic remobilization of Fe, Mn, Cu and, to a lesser extent, Pb that likely corresponds to sapropel event S1.