福建永安丰门坑多金属矿地质特征及找矿前景

永安丰门坑多金属矿呈似层状、层状、透镜状,贮存在寒武系林田组下段钙质碎屑岩中,矿床具明显的层控和热液叠加改造特征,为沉积-热液改造型多金属矿床。该多金属矿床的发现,为我省在寒武系林田组中寻找该类矿床提供新的目标。     

Arc Gis在西天山阿吾拉勒东段铁矿资源预测的应用

本文以西天山阿吾拉勒东段海相火山岩型铁矿为例,从研究区的地质背景和已查明的6个海相火山岩型铁矿(点)出发,基于ArcGIS平台,建立空间数据库,结合已知矿(点)地质资料和野外验证分析,建立找矿模型与预测区提取模型,总结本区铁矿的主要控矿因素:①沉积地层;②侵入体;③布格重力异常;次要影响因素:①断层距离;②断层密度,将5个方面的证据图层与铁矿(化)点空间关系合成,采用证据权模型和加权Logistic回归模型进行成矿有利度评价,将研究区划分为6个靶区,结合研究区中主要矿(化)点对各靶区的地质成矿条件进行了探讨,分析了该地区的找矿潜力。     

Two geodynamic–metallogenic events in the Balkhash (Kazakhstan) and the West Junggar (China): Carboniferous porphyry Cu and Permian greisen W-Mo mineralization

This study focuses on the geochronology and elemental and Nd isotopic geochemistry of the Baogutu Cu deposit and the newly discovered Suyunhe W-Mo deposit in the southern West Junggar ore belt (Xinjiang, China), as well as the geology of the newly discovered Hongyuan Mo deposit in the southern West Junggar ore belt and the Kounrad, Borly, and Aktogai Cu deposits and the East Kounrad, Zhanet, and Akshatau W-Mo deposits in the North Balkhash ore belt (Kazakhstan). The aim is to compare their petrogenesis, tectonic setting, and mineralization and to determine the relationship between the southern West Junggar and North Balkhash ore belts. Based on our newly acquired results, we propose that the Kounrad, Borly, Aktogai, and Baogutu deposits are typical porphyry Cu deposits associated with calc-alkaline magmas and formed in a Carboniferous (327–312 Ma) subduction-related setting. In contrast, the East Kounrad, Zhanet, Akshatau, Suyunhe, and Hongyuan deposits are quartz-vein greisen or greisen W-Mo or Mo deposits associated with alkaline magmas and formed in an early Permian (289–306 Ma) collision-related setting. Therefore, two geodynamic–metallogenic events can be distinguished in the southern West Junggar and North Balkhash ore belts: (1) Carboniferous subduction-related calc-alkaline magma – a porphyry Cu metallogenic event – and (2) early Permian collision-related alkaline magma – a greisen W-Mo metallogenic event. The North Balkhash ore belt is part of the Kazakhstan metallogenic zone, which can be extended eastward to the southern West Junggar in China.     

河南省卢氏县八宝山铜矿床地质特征及成因

河南省卢氏县八宝山岩体属晚侏罗世中酸性浅成小岩体。结合前人研究成果,通过研究该矿区地质特征和物化探成果,结合本次普查中对成矿理论的实地钻探工程验证,研究认为八宝山矿床类型为斑岩-矽卡岩型矿床,且矿床由内向外具有明显的高中低温分带性,矿床三种分带围绕岩体呈环状分布。成矿模式为以岩体中心相为中心至外侧边缘相,依次为斑岩型-矽卡岩型-热液型三条环带模式。研究区最新提交备案成果（普查）：铁矿石量2389.10万吨,硫铁矿石量334.00万吨,铜金属量108962,提交一中型铜矿床。通过研究该矿床成因及成矿模式,为研究区资源储量提升找到工作靶区,也为寻找相同类型矿床或者附近隐伏矿床提供借鉴依据。     

锑矿床研究若干问题初探

锑矿床研究的重点包括：锑矿床分类;不同构造环境下锑矿庆的成因模式;锑的来源。今后锑矿床分类将以锑矿庆形成的构造背景为主,结合锑矿床成因方式和容矿主岩特点来进行。文章介绍了几种典型构造环境下（大型走滑、造山挤太和造山崩坍）锑矿床形成机理和成因模式。现有的资料表明锑矿床受壳幔相互作用所制约（如拆沉作用,ｄｅｌａｍｉｎａｔｉｏｎ）,这无疑会成为锑矿研究的热点和难点。     

K-Ar Ages of Granitic Magmatism and Related Pegmatite Formation at the Umanotani-Shiroyama Mine, Shimane Prefecture, SW Japan and Their Bearings on Cooling History

Abstract. The Umanotani-Shiroyama pegmatite deposits, the largest producer of K-feldspar and quartz in Japan, are of typical granitic pegmatite. Ilmenite-series biotite granite and granite porphyry, hosting the ore deposits, and biotites separated from these rocks yielded K-Ar ages ranging from 89.0 to 81.4 Ma and 95.2 to 93.7 Ma, respectively. Muscovite and K-feldspar separated from the ore zone yielded K-Ar ages with the range of 96.2 to 93.1 Ma and 87.3 to 80.7 Ma, respectively. Muscovites from quartz-muscovite veins in the ore zone and in the granite porphyry yielded K-Ar ages of 90.4 and 76.3 Ma, respectively. K-feldspar is much younger in age than coexisting muscovite. It is noted that the K-Ar ages of biotite separates and the whole-rock ages are identical to those of muscovite and K-feldspar in the ore zone, respectively. These time relations, as well as field occurrence, indicate that the formation of the pegmatite deposits at the Umanotani-Shiroyama mine is closely related in space and time to a series of granitic magmatism of ilmenite-series nature. Using closure temperatures of the K-Ar system for biotite and K-feldspar (microcline), cooling rate of the pegmatite deposits is estimated to be about 82C/m.y. at the beginning, but slowed down to about 15C/m.y. in the later period.     

胶东福山北部地区金及多金属成矿系列及找矿方向

胶东福山北部地区位于胶东栖(霞)-蓬(莱)-福(山)成矿带北段。该区粉子山群大面积出露,中生代岩浆活动强烈,褶皱断裂构造发育,形成一完整的热液成矿系统。对区内邢家山(钼钨)、王家庄(铜锌)、杜家崖(金)等典型矿床(式)研究发现,该区金属成矿作用与中生代燕山晚期斑岩体具有密切关系,由高温至低温成矿作用在空间上展布规律明显,共同构成了与中生代燕山晚期中酸性岩浆侵入作用有关的金及多金属成矿系列。从现有研究成果看,中低温热液脉型、斑岩-矽卡岩型以及浅成低温热液型金及多金属矿应作为该区找矿主攻方向。     

西藏列廷冈铁多金属矿床辉钼矿Re-Os定年及其地质意义

列廷冈铁多金属矿床不仅是西藏林周盆地已发现的众多铁多金属矿床中工业价值、找矿远景最好的矿床之一,而且是冈底斯成矿带Fe、Cu、Mo、Pb、Zn等多矿化元素组合的典型代表。本次研究利用辉钼矿Re-Os同位素年代学测试方法,对列廷冈矿床8件辉钼矿进行了精确定年,首次明确了矿床成矿时代。测试结果表明,辉钼矿模式年龄为(60.97±0.92)Ma~(63.19±0.93)Ma,等时线年龄为(62.28±0.66)Ma(MSWD=0.74),矿床形成于古新世,与印度—亚洲大陆主碰撞阶段在冈底斯成矿作用有关。矿床辉钼矿Re含量变化于0.54×10-6~84.72×10-6,指示矿床成矿物质来源主要为壳幔混源。列廷冈矿床成矿时代和成矿物质来源的厘定,对于区域上开展古新世铁多金属矿床的找矿预测具有十分重要的意义。     

Heterogeneous aquitard properties in sedimentary successions in the Apennine chain: case studies in southern Italy

The aim of this study was to analyse the hydrogeologic role of siliciclastic deposits and marly‐clayey‐calcareous successions within the carbonate Apennine chain (southern Italy). The study was carried out along the northern part of the Matese carbonate massif through (1) the hydraulic characterization of siliciclastic rocks in a test site, by means of Lugeon tests, and (2) the identification of the groundwater flow system discharging at an important spring located within a marly‐clayey‐calcareous succession in a second test site, by means of isotopic investigations. The results showed that the investigated siliciclastic deposits and marly‐clayey‐calcareous successions may allow significant groundwater discharge from carbonate aquifers. Thus, they do not everywhere behave as aquitard, contrary to the previous model. Instead, groundwater flows through the upper part of these successions, where stress release fracturing enhanced rock permeability in the near‐surface bedrock. Thus, these successions may locally be a new groundwater source within the southern Apennine chain. Copyright © 2009 John Wiley & Sons, Ltd.     

浙江中生代陆缘火山岩金矿成矿系统

浙江地处中国东南沿海大陆边缘火山岩成矿带，已发现众多金（银）矿床（点），它们在空间上往往不是孤立地出现，而是在数十至数百平方公里内围绕岩浆热中心相对集中，并与有色金属在矿田范围内伴生。研究证明，金（银）及有色金属矿床是同一火山—侵入旋回过程中形成的有成因联系的矿床。笔者将这种在同一火山—侵入旋回间，围绕同一个岩浆热中心，在不同深度和水平距离内形成的一系列具有成因联系的金（银）和有色金属矿床的总和称为火山岩金矿成矿系统。本文在此概念基础上，详细论述了浙江中生代陆线火山岩金矿成矿系统的类型。时空结构和物质来源。