矿床分带研究综述

本文概括阐述了矿床分带研究的意义,评述了分带研究的现状,并对矿床分带研究的前景进行了展望。     

新疆西准噶尔金矿成矿域矿床成因及矿床模式

新疆西准噶尔金矿成矿域是大区域内成矿单位，成矿域中所有金矿床（点）均产于地壳构造活动带。富含金的地幔物质沿深大断裂上升侵位，分熔，产生岩浆，火山活动，壳下重熔再熔、火山物质沉积变质作用，在漫长的华力西期经历反复多次的构造变动，形成超基性－基性火山－沉积－变质含金建造，是准噶尔－哈萨克斯坦古板块碰撞作用的产物。     

过去20年矿床事业发展的概略回顾

文章概略回顾了过去20年在找矿和成矿理论研究方面获得的若干重要成就。指出这一阶段虽在一些国家存在矿业不景气，但找矿进展，特别是金、铜矿床、仍很出色。矿业中国都强调了超大型矿床的重要性。在成矿理论方面，主要就多样复杂的海底成矿，三大巨型成矿域，成矿模式，中酸性岩浆岩及有关成矿作用，层控矿床，同位素、微量元素及气液包裹体运用于成矿等问题的研究历史作了回顾。     

康家湾铅锌矿床成矿地质条件及矿床成因探讨

本次提出康家湾大型隐伏铅锌矿床的赋矿岩石是隐伏的古溶洞经印支到燕山运动多次构造作用引起上部岩石坍塌堆积形成的混杂建造－塌积硅化碎裂混杂岩。混杂建造的下部边缘是优越的成矿物理化学界面，多形成富厚矿体。从硫同位素资料、Ｎａ＾＋／Ｋ＾＋值、测温资料、矿物组构等分析，康家湾铅锌矿床属与岩浆作用有关的中温热液矿床。     

A state geological survey commitment to environmental geology—the Texas bureau of economic geology

Published by permission of the Director, Texas Bureau of Economic Geology.     

The opaque minerals and economic geology of the nemeiben ultramafic complex,saskatchewan, canada

The main rock types of the Nemeiben ultramafic complex form grossly concentric layers of clinopyroxenite, websterite, wehrlite and dunite. These rocks were partially amphibolitized late in the Hudsonian orogeny; consequently numerous relict primary textural and mineralogical features are preserved. Disseminated primary magmatic nickeliferous pyrrhotite, pentlandite, chalcopyrite, magnetite and chromite occur throughout this complex and local concentrations of sulfides occur. Textures, mineralogy and chemistry of these phases are indicative of a high temperature magmatic origin. Unmixing phenomena in pyrrhotite are attributable to post crystallization dissociation of a high temperature Fe-Ni-Cu-Co monosulfide solid solution. A secondary assemblage of fine-grained iron oxides, sulfides and native metals developed in altered ultramafic rocks. Magnetite and hematite, bravoite, violarite and millerite are among the minerals formed during serpentinization. Trace amounts of nickeliferous copper, native gold and silver occur in hematite veinlets and at the center of hematized former sulfide grains. Supergene alteration has affected most of the sulfides. Thus the most plausible explanation of the opaque minerals is that they represent a metamorphosed primary magmatic assemblage modified by supergene alteration.     

Regional and economic geology of Pennsylvanian age coal beds of West Virginia

West Virginia is the only place in the United States where an entire section of Pennsylvanian age (Upper Carboniferous) strata can be seen. These strata occur within a wedge of rock that thins to the north and west from the southeastern part of the State. The progressive north-northwesterly termination of older Pennsylvanian geologic units beneath younger ones prominently outlines the center of the Appalachian basin of West Virginia. Over most of West Virginia, Lower and/or Middle Pennsylvanian strata unconformably overly Upper Mississippian (Lower Carboniferous) strata. Sediment deposition was accomplished by a complex system of deltas prograding north and west from an eastern and southeastern source area.More than 100 named coal beds occur within the Lower, Middle, and Upper Pennsylvanian rocks of West Virginia and at least 60 of these have been or are currently being mined commercially. Collectively, these coal beds account for original in-ground coal resources of almost 106.1×10⁹ t (117×10⁹ tons). West Virginia ranks fourth in the United States in demonstrated coal reserves. In 1988, West Virginia produced 131.4×10⁶ t (144.9×10⁶ T) of coal, third highest in the United States. Of this annual production, 75% was from underground mines. In 1988, West Virginia led the nation in the number of longwall mining sections currently in place. West Virginia's low-volatile coal beds are known worldwide as important metallurgical-grade coals, while the higher-volatile coal beds are utilized primarily for steam production.