用正交函数拟合方法揭示新疆阿舍勒铜锌矿区构造

正在勘探中的新疆哈巴河县阿舍勒铜锌矿床，属海相火山喷气－沉积成因。矿体呈厚大扁豆状，具层控特征，且矿体和围岩密度差别较大。为了更好地解决矿区构造背景，探索、研究深部找矿信息与标志，本文采用数学地质－正交函数拟合方法及多次拟合技术，对具有空间形态特征的地质信息进行处理。结果将成矿层的局部重力异常从实测布伽异常值中分离出来。在分离出的局部重力异常等值线图上，显示出了三条南北向的重力高异常带、构造转折带     

阿尔泰阿舍勒铜锌矿床模型及找矿靶区预测

阿舍勒大型铜锌矿是我国典型的海相火山岩块状硫化物(VMS)型矿床,赋存于阿舍勒盆地早—中泥盆世阿舍勒组海相火山-沉积岩系中。结合阿舍勒铜锌矿最新勘探成果,通过对阿舍勒铜锌矿床矿物组合分带、矿石构造分带及成矿温度分带的研究,在Ⅰ号矿体9～21线0 m标高以下划分出一走向近NS向的火山喷流通道并总结了成矿模型。最终划分出Ⅰ号矿体9～21线-200 m以下及Ⅴ号矿化蚀变带深部两处找矿靶区。     

新疆昭苏阿尔恰勒他乌铅锌矿床地球物理特征与深部找矿预测

阿尔恰勒他乌铅锌矿床是一个矿床分带清晰、控矿机理明显及矿化蚀变强烈的多金属矿床,铅锌矿体产于灰岩地层,产状与围岩基本一致,已知矿体上的实验表明矿体具有低阻高极化的特点.采用激电中梯扫面在矿区圈出了6个激电异常区,并在激电异常区内开展音频大地电磁测深工作,查明了激电异常区地下深部构造的电性情况,结合矿区矿体特征及成矿模式,建立了矿区地球物理音频大地电磁测深电性找矿模型,指出倾斜或层状的中低阻电性异常最有可能是含矿构造带存在的地球物理标志.综合物探激电扫面、音频大地电磁测深、地质等信息,圈出2个找矿靶区,经钻孔在Ⅱ号靶区19号线验证,在孔深331~349m见到厚度约18m的矿体.激电法与音频大地电磁测深的方法技术组合可以在该类型矿床深部找矿中推广使用.     

阿舍勒铜锌矿综合找矿预测模型

通过新疆矿产资源潜力评价工作,对新疆阿舍勒海相火山岩型铜锌矿成矿环境、特征、成因、成矿规律及控矿要素进行总结,认为该矿床是产于阿舍勒拉张裂谷中心带、与早—中泥盆世火山岩有关的块状硫化物矿床,且严格受双峰式火山岩建造控制。基性火山岩与酸性火山岩接触界面是寻找此类矿床重要地质标志。高重力、低电阻和强铜、锌、银元素异常组合的出现是定位矿体的有效信息。重力+TEM+岩石化探是寻找此类矿床的最佳技术组合。     

西昆仑昆盖山萨洛依西铜矿地质、地球物理特征及找矿方向

萨洛依西铜矿是昆盖山北坡下石炭统乌鲁阿特组细碧角斑岩建造中产出的火山岩型块状硫化物矿床。赋矿围岩为黄铁矿化、绿泥石化的细碧岩,矿体呈似层状与热水沉积岩共生,沿同一层位产出,形成于火山活动的间歇期。铁帽、黄钾铁矾带、孔雀石化、蓝铜矿化、黄铁矿化是直接有效的找矿标志。低阻高极化的激电异常是寻找含铜黄铁矿体的有利部位,呈囊状、半月状的近地表、中浅部及近直立且向深部延伸较大的低阻带也显示了较好的找矿前景。对比阿舍勒铜矿的地球物理勘查成果,可依据矿体具有的低阻、高极化、高重力组合异常特征,开展高精度重力勘查工作,为后续找矿勘查工作提供方向。     

《新疆阿舍勒型铜-锌矿床成矿地质条件及成矿模式》简介

《新疆阿舍勒型铜-锌矿床成矿地质条件及成矿模式》由原地矿部西安地质矿产研究所周良仁研究员等著,西安交通大学出版社出版,全书30万字.本书主要论述了阿舍勒块状硫化物铜-锌矿床形成的构造环境,成矿时代为早中泥盆世,主矿层位于阿舍勒组“沉凝灰岩”的顶部;泥盆纪海相火山岩属反序列的细碧岩-石英角斑岩,具典型双峰岩套的特征,阿舍勒铜-锌矿床与此有明显的专属性;矿区由三个构造层组成,总体组成一个向北倾伏的复向斜构造,Ⅰ号铜-锌则为向西倒转向斜构造的组成部分;矿床具明显的双层构造及矿石的分带性;还总结了矿床的找矿标志,包括地、物、化标志,并提出了两个重点找矿预测区.本书的出版,无疑对推动阿尔泰南缘和开展我国同类型矿床以及与海相火山岩有关的块状硫化物矿床的研究和地质勘查具有重要的理论和实际意义.本书现有少量库存,每册30 元,需要者请与《西北地质》编辑部联系.     

《新疆阿舍勒型铜-锌矿床成矿地质条件及成矿模式》简介

《新疆阿舍勒型铜 -锌矿床成矿地质条件及成矿模式》 (简称“阿舍勒”)。本书由原地矿部西安地质矿产研究所周良仁研究员等著。西安交通大学出版社出版。全书 30万字 ,每册 2 6元(含邮寄费 )。本书主要论述了阿舍勒块状硫化物铜 -矿床形成的构造环境 ,成矿时代为早中泥盆世 ,主矿层位于阿舍勒组“沉凝灰岩”的顶部 ;泥盆纪海相火山岩属反序列的细碧岩 -石英角斑岩 ,具典型双峰岩套的特征 ,阿舍勒铜 -锌矿床与此有明显的专属性 ;矿区由三个构造层组成 ,总体组成一个向北倾伏的复向斜构造 , 号铜 -锌则为向西倒转向斜构造的组成部分 ;矿床具有…     

西天山哈尔嘎嘎林恩铜金矿床地质特征及综合找矿模型

哈尔嘎嘎林恩铜金矿床位于西天山阿吾拉勒铁-铜-金多金属成矿带东段,矿区下石炭统艾肯达坂组地层大面积出露,海西晚期闪长岩类分布广泛,NNW向及NW向断裂构造发育。目前已发现的6个铜及铜金矿体均产于艾肯达坂组火山碎屑岩中,主要矿石矿物为黄铜矿、斑铜矿及辉钼矿。钾化、黄铁绢英岩化、青磐岩化等蚀变发育,具斑岩型矿床围岩蚀变典型分带特征。1∶1 000地质-化探剖面测量结果表明,Cu、Au、Mo、Ag等元素含量变化趋势一致且与矿(化)体及钾化蚀变吻合较好;瞬变电磁及磁法测量结果均指示Ⅱ、Ⅲ号矿体SE端深部可能存在隐伏岩体。根据矿床地质、地球化学和地球物理特征,构建了综合找矿模型,并对区内下一步找矿方向进行了预测,认为区内寻找斑岩型多金属矿床的潜力巨大,勘探重点为瞬变电磁高阻异常、正磁异常及化探组合异常叠加区域3 000m标高以下地段。     

四川章姜冲金矿区地质特征及化探找矿效果

通过对矿区地质背景,地层、构造、岩浆岩及矿体分布、形态,矿石结构构造、围岩蚀变等特征的研究,查明了矿床控矿因素主要有地层、构造及围岩蚀变等.研究区实施的1:5万水系沉积物及1:1万土壤地球化学测量,圈定Au异常区4个,均为矿致异常,具良好的找矿前景,化探找矿效果明显.     

四川德昌县铜厂坡铜铁矿地质特征及找矿前景

铜厂坡铜铁矿位于会理岔河锡铁铜银矿集区内。矿体产于前震旦系会理群力马河组二段褐灰色石英片岩构造破碎带或层间破碎带中,呈似层状、透镜状产出。矿体受构造控制明显,产状与控矿构造基本一致。矿石主要为含铜菱铁矿、含铜褐铁矿。矿床属于构造热液型。该文通过对矿床区域地质背景、矿区地质特征、矿体特征、矿石质量、围岩蚀变的分析,对矿床控矿因素、成因、找矿标志进行了讨论,认为该矿区成矿地质条件好,具有较好的找矿前景,并提出了下一步工作的建议。     

新疆阿尔泰阿舍勒矿集区铜多金属矿床模型

阿舍勒是新疆十分重要的铜多金属矿集区,矿化均赋存于下–中泥盆统阿舍勒组火山岩系中。矿化类型多,成矿元素组合复杂(Cu、Cu-Zn、Cu-Zn-Au、Cu-Pb-Zn-Au、Cu-Pb-Zn-Ag)。阿舍勒组火山活动时间是402~375 Ma,矿化时间为394~379 Ma,持续了15 Ma。本文通过对阿舍勒铜锌矿和萨尔朔克金多金属矿的系统研究,提出阿舍勒矿集区矿床模型,认为尽管矿集区铜多金属矿化类型多,成矿元素组合复杂,但成矿均与火山作用有关,属同一VMS成矿系统,只是不同部位存在矿化差异。在火山斜坡和洼地喷流沉积形成层状铜锌矿体和重晶石矿体,补给通道中形成脉状铜(锌)矿体和铜铅锌银矿体,潜流纹岩中形成脉状金铜铅锌矿体,潜英安岩中形成铜矿体,潜火山岩接触带形成铜矿体,在断裂或裂隙中形成铜矿体。     

新疆阿舍勒铜矿区双峰式火山岩与成矿背景的初步研究

新疆阿舍勒铜矿是我国近十多年来找到的一个大型海相火山岩型块状硫化物多金属矿床，在经济上和矿床学上都有重要意义。阿舍勒铜矿的容矿岩是早－中泥盆世阿舍勒组海相火山岩，具特征的双峰式组合，缺少含ＳｉＯ２５４％－６１％的中性岩，在地表和钻孔都经常见到基性与酸性火山岩紧密互层现象。稀土和微量元素地球化学表明基性、酸性火山岩来自两个不同的源区。矿石铅同位素组成与细碧岩一致，硫同位素呈典型塔式分布，表明成矿物质     

The Ashele Deposit: A Recently Discovered Volcanogenic Massive Sulfide Cu-Zn Deposit in Xinjiang, China

Abstract: The Ashele Cu-Zn deposit is a recently discovered volcanogenic massive sulfide deposit in Xinjiang, Northwestern China. It is the largest Cu-Zn deposit in this type of deposits in China, which were formed in the early period of later Palaeozoic Era. This deposit is hosted within a suit of bimodal submarine volcanic rocks of the Ashele Formation of Lower-Middle Devonian System formed in an environment of paleocontinental margin rift setting. Lensoid orebodies occur between spilitic rocks developed at footwall and quartz-keratophyric tuff at hanging wall. Zonation of metal elements in the Ashele mine is one of typical volcanic-related exhalative Cu-Zn sulfide deposits in the world. Black ores enriched in Pb, Zn and Ag occurs on the top of the No. 1 orebody in the Ashele deposit, yellow ores enriched in Cu in the middle part, and the chalcopyritization stringer below the massive sulfide ores. Zonation of ore-structure in the No. 1 orebody is also apparent and corresponds to the zoning of elements, i. e. lamellar and/or banded sulfide-sulfate ores on the top, massive sulfide ores in the middle, and stockwork veinlets associated with altered breccia pipe on the bottom. Four epochs of mineralization in the Ashele deposit has been recognized. The first period of syngenetic-exhalative deposition of sulfides is the main epoch of mineralization, and the ores deposited subsequently subjected to thermo-metamorphism at the second epoch, superimposed by hydrothermal mineralization at the third epoch, and weathered or oxidized at the fourth epoch.
More than 100 categories of minerals have been recognized in the Ashele mine, but only pyrite, chalcopyrite, sphalerite, tetrahedrite, galena, barite, quartz, chlorite, sericite, and calcite are dominant, making up various types of ores, and alteration pipes or horizons. Studies of ore petrology suggest that the massive ores were volcanogenic and deposited by exhalative process.     

Source of ore-forming material for the Huangtuliang gold deposit,Hebei Province and ore prospecting in the deep periphery

The Huangtuliang gold deposit is characterized by its wide and large ore belt, stable extension and closely spaced orebodies. Unfortunately, no orebody was found by deep drilling. As a result, ore prospecting in this region was once put into dilemma. Detailed analysis of ore-forming and ore-controlling structures in the mining district by the authors has revealed that the ore-forming and ore-controlling structure in this mining district is a steeply dipping （85°-110°/∠70°-85° N-NNE）, spade-shaped ductile shear zone, and the ore-controlling structures are a series of nearly erected second-ordered faults which are developed in the upper part of the ductile shear zone, inter-secting with the ductile shear zone. Deep cutting of the ductile shear zone made it possible the ascending of ore fluids from the mantle plume at depth and these ore fluids would migrate upwards along the ductile shear zone under certain temperature and pressure conditions. Along their ascending path, the ore fluids would extract ore-forming elements from the country rocks and the extracted ore-forming elements would be deposited as ores in the hang- ing-wall second-ordered faults. The reason why no orebody was found in early prospecting at depth is that north- ward-dipping drilling in the southern part of the shear zone extended so deeply as to be beneath the shear zone. Only shallow-level orebodies could be found by southward-dipping drilling practice in the northern part of the shear zone. The location where deep-seated orebodies occurred shifted northwards and the orebodies occurred at greater depth. Therefore, it is natural that no orebody could be found when drill core passed through the shear zone. After the ore-forming and ore-controlling structures were well understood, the focus of ore prospecting was placed on the deep-level, northward-penetrating veins. In this way a number of new blind orebodies of great thickness have been found. On the basis of research development in the mining district, a prospecting plan has been made     

Halogen elements as indicator of deep-seated orebodies in the Chadong As–Ag–Au deposit, western Guangdong, China

Halogen elements play an important role in the metallogenesis of metallic ore deposits and are involved in the whole process of remobilization, transport and precipitation of metallic elements. However, with the exception of fluorine, which, as a component of fluorite and mica minerals, can be occasionally concentrated in ores, Cl, Br and I are hard to enrich in the ores. Investigations have found that the halogen elements tend to diffuse toward country rocks with the development of hydrothermal alteration in the process of their involvement in metallogenesis, especially during the post-ore stage when extensive halogen diffusion halos over orebodies would be formed. Such halogen element diffusion halos over the Chadong As–Ag–Au deposit extend as widely as 200 m. The largest diffusion extent is for I and the diffusion halos of Br are most noticeable 50–130 m away from the orebodies. In areas of ore exposure and the strongly altered zone, the Cl, Br and I contents are close to those of the strata with a V-shaped distribution pattern in the periphery of the mining district. Comparatively speaking, in going away from the altered zone, the major metallic elements Au and Ag in the deposit tend to decrease suddenly to their normal contents in the strata. This variation feature of halogen elements can be used as geochemical indicators for exploring concealed orebodies at depth. In the Chadong ore deposit, halogen element anomalies can be used to predict concealed orebodies at the depth range of 0–200 m.     

REE Geochemistry of VMS and SEDEX Ores in China

REE ratios and patterns for massive pyrite ore and massive cuprous pyrite ore ofthe Baiyinchang orefield are quite similar to those for quartz keratophyritic tuff and quartzalbitophyre of the same orefield. However, massive cuprous pyrite ore of the Ashele Cu-Zn de-posit is similar to basalt-diabase of the same district in REE geochemistry. Comparison of theChinese VMS ores with those from Rio Tinto, Spain and Que River, Australia, in REEgeochemistry has been made. REE ratios and patterns of bedded-massive and massive ores ofthe Changba-Lijiagou Zn-Pb deposit, the second largest SEDEX deposit in China are similarto those of their host rocks, the Qinling shales of Devonian age and the Changba adamellite.The three types of ore and their host rocks of the Dongshengmiao pyrite (pyrrhotite)-Zn-Pbdeposit have parallel REE ratios and patterns.     

钟丘洋火山热液型铜矿床地球化学异常特征

据钟丘洋火山热液型铜矿床的地层、侵入岩、矿石和矿体中元素的分布规律,阐明了该矿床的地球化学原生异常特征;确定了与矿床有关的指示元素及其分带序列;建立了矿床剥蚀程度的评价指标及该矿床的地球化学异常模式。     

河北省铁矿分布与重磁场特征的关系

在河北省铁矿资源潜力评价及成矿预测中,对重力场、磁场特征进行了总结和归纳,认为规模较大的航磁正异常主要是出露或隐伏侵入岩基的反映;大面积分布的低缓正磁异常区则主要反映了太古宙变质岩系或基底隆起的边缘,沉积变质型铁矿主要密集分布在此区域;负磁场区主要出现在中上元古界、古生界碳酸盐岩和中生界酸性火山—沉积岩系;强度高、梯度大、或有明显负值伴生的局部磁异常则可能是磁性铁矿的反映。从重力场特征看,磁性铁矿主要分布在布格重力异常的梯级带或异常扭曲处,以及正、负异常的交界处,这些地方多与地质构造强烈变形密切相关。只有对重磁场进行深入地质剖析,结合典型矿床上建立的识别标志进行对比分析,才能得出一个符合客观实际的地质解释。     

新疆哈巴河萨尔朔克金矿地质特征及成因初探

萨尔朔克金矿产于中泥盆统阿舍勒组中酸性火山岩一次火山岩中,矿体产出形态及空间分布严格受NNW向断裂控制,矿体呈脉状、透镜状,倾角60°～87°.矿石以蚀变岩型为主,其次为石英脉岩型,围岩为黄铁绢英岩化流纹斑岩.成因与古火山机构、次火山岩及构造带有密切关系,属中低温火山-次火山热液型金矿床.