甘肃西成地区层状的花岗质岩脉地质地球化学特征及其与金矿关系

西成地区小沟里和三洋坝金矿区发育层状的花岗质岩脉带，其成岩物质既有岩浆热液来源又有地层来源，反映了海西期秦岭裂谷扩张时岩浆热液顺层交代泥盆系岩层的成因特征；层状的花岗质岩脉与石英钠长岩等共同构成了西成地区泥盆纪热液交代，热水沉积所形成的层状交代沉积岩系；层状的岩脉与金矿床的空间关系密切是寻找金矿床的有效岩石标志。     

华中榴辉岩域的岩浆型榴辉岩及其形成机制

中国中部鄂豫皖苏鲁的榴辉岩分布面积约达５００００ｋｍ＾２，构成地球上一个罕见的宏大的榴辉岩域。榴辉岩的主要围岩是长曲质片麻岩，它与榴辉岩不是相同高压变质作用的产物。     

内蒙古宁城地区煌斑岩与金矿

内蒙古宁城地区出露加里东海西期煌斑岩脉群，其中云斜煌斑岩内，沿燕山期韧性剪切片理化带，分布金矿体。煌斑岩是客观找金的标志。金矿体中硅化，绿泥石化，方解石化发育。主要金属矿物是黄铁矿。金主要以显微次显微自然金包裹体，赋存于黄铁矿内。     

脉金矿体侧伏研究方法及应用

从构造解析，构造地球化学，构造地球物理学，岩石矿物学，地质类比等方面探讨脉金矿体测伏的研究方法，并阐明其在岩金勘查和矿山开采中的应用，以提高脉金深部勘探工程和采矿坑道工程的设计中率。     

八卦庙金矿床中含金石英脉的地球化学特征及意义

八卦庙金矿床是分布于秦岭造山带中的一种中高温碳酸盐型热液金矿床。石英是其主要的脉石矿物之一，与金矿化密切相关。根据含金石英脉的产状可将其分为三种类型：①顺层石英脉；②含铁白云石石英脉；③ＮＥ向节理石英脉。它们在微量元素和稀土元素的组成特征上有一定的差异，分别形成于金的不同成矿阶段，是金在成矿作用过程中演化的产物。同时，为八卦庙金矿的成矿提供了条件。石英中包裹体测温结果为八卦庙金矿床的中温成因提供了证据     

Migmatite structures in the Central Gneiss Complex, Boca de Quadra, Alaska

Abstract Migmatite structures in the Coast Plutonic-Metamorphic Complex are well exposed in the inlet of Boca de Quadra, southeast Alaska. Two types of anatectic migmatites are present. Patch migmatites formed by in situ melting and subsequent crystallization of melt. Diktyonitic migmatites comprise a discontinuous veined network of leucocratic material, in which leucosomes enclose boudins of host rock. The margins of these boudins show the development of both melanosomes and shear band fabrics.
Strain analysis of diktyonitic melanosomes indicates that these regions have undergone volume decreases of 20-27%. This volume decrease is attributed to melt extraction into the adjacent fracture-filling leucosomes. Thus, diktyonitic migmatites formed by shear-induced segregation of partial melt, whereas in patch migmatites the lack of shear stresses inhibited melt segregation. The variable structural style of anatectic migmatites in Boca de Quadra is not related to host-rock composition, but may be due to differences in the amount of differential stress during migmatization. These in turn may be controlled by host-rock strength and/or diachroneity of migmatization and deformation.
Determination of volume changes during migmatization using strain analysis is potentially capable of discriminating intrusive and anatectic migmatites and consequently of documenting melt segregation and subsequent migration across crustal levels.     

黑钨矿矿囊熔离成因综述

一些与石英脉型钨锡矿化有关的花岗岩体内常发育有形态不同、规模不等、成分各异的矿化囊包体．其成因难手用岩浆结晶分异和岩浆期后热液成矿作用解释。地质和实验资料表明。此类花岗质岩浆体系中不仅存在液态分离作用形成熔离矿化囊包体。而且熔离成因的黑钨矿矿囊可作为岩体可以形成岩浆热液鸽矿的标志，同时说明石英脉型黑钨矿床的剥蚀深度较大。     

Shear-hosted Mesothermal Vein System in the Jiapigou Goldfield, Northeast China: Implication for Subsequent Exploration

Abstract. The auriferous mesothermal lodes and veins occurred in the Jiapigou Goldfield, Jilin Province, Northeast China, are inevitably hosted by shear zones or fractures of varying orientations and magnitudes. Our recent study suggests that the Jiapigou major shear zone (JMSZ) - a regional NW-SE-trending driving structure, played an essential role in the formation and localization of the shear-hosted auriferous mesothermal systems. Regional dextral shearing of the JMSZ controlled the general occurrences and orientations of lodes and veins, and consequently, constrained the development of the internal structures, geometric details and final localization of lodes and veins. Therefore, the development and final localization of shear-hosted gold system can be comprehensively recognized in terms of both the Riedel shear system theory and the effects of the regional prolonged progressive deformation of subhorizontally right-lateral shearing. The lodes and veins belonging to "R-" and "D-shear" would tend to be much more stable along their strike and dip directions than those belonging to "T-fracture" in the Riedel shear system. However, due to the prolonged progressive deformation, the original T-fractures might undergo local strain localization and partitioning and finally were modified into hybrid fractures filled by auriferous quartz veins, as displayed by many typical lodes and veins occurred in the Jiapigou Goldfield. In order to refine predictive exploration modeling, it is important to understand the structural attributes, geometries, and final localization kinematics of ore-hosting shears in a huge shear system as that developed in the Jiapigou Goldfield.     

Fluid Inclusions in the Gold—Bearing Quartz Veins at Um Rus Area,Eastern Desert,Egypt

Fluid inclusions in the gold-bearing quartz veins at the Um Rus area are of three types: H₂O, H₂O−CO₂ and CO₂ inclusions. H₂O inclusions are the most abundant, they include two phases which exhibit low and high homogenization temperatures ranging from 150 to 200°C and 175 to 250°C, respectively. The salinity of aqueous inclusions, based on ice melting, varies between 6.1 and 8 equiv. wt% NaCl. On the other hand, H₂O−CO₂ fluid inclusions include three phases. Their total homogenization temperatures range from 270 to 325°C, and their salinity, based on clathrate melting, ranges between 0.8 and 3.8 equiv. wt% NaCl. CO₂ fluid inclusions homogenize to a liquid phase and exhibit a low density range from 0.52 to 0.66 g/cm³. The partial mixing of H₂O−CO₂ and salt H₂O−NaCl fluid inclusions is the main source of fluids from which the other types of inclusions were derived. The gold-bearing quartz veins are believed to be of medium temperature hydrothermal convective origin.     

甚低频电磁法对脉状矿床勘查评价的意义——以金、铅锌(银)和萤石矿为例

脉状矿床是重要的矿床类型之一。其矿体往往赋存于断裂构造之中，甚低频电磁法（VLF-EM）以其成本低廉、轻便高效，以及对脉状矿（化）体特有的灵敏性而具有特色。文章通过对以脉状形式产出的金、铅锌（银）及萤石矿的VLF-EM找矿勘查实例，探讨了VLF-EM对这类矿床勘查的有效性和优越性，结果表明该方法对脉状矿床勘查评价有重要意义。