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对江苏宁镇山脉南缘汤山、仑山地区金矿赋存层位、土壤地球化学异常分布特征及区域性层滑断裂构造进行了综合分析,认为碳酸盐岩-泥质岩组合和区域性层滑断裂对金矿成矿有控制作用.在对汤-仑地区金矿成矿规律总结的基础上,提出了宁镇地区寻找金矿的前景.结合区域地质演化和中生代岩浆活动特征,建立了该区金矿成矿作用模型.与长江中下游西段铁铜金等成矿作用相仿,本区金矿的形成与燕山期岩浆期后热液活动密切相关. 相似文献
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对江苏宁镇山脉南缘汤山、仑山地区金矿赋存层位、土壤地球化学异常分布特征及区域性层滑断裂构造进行了综合分析,认为碳酸盐岩-泥质岩组合和区域性层滑断裂对金矿成矿有控制作用.在对汤-仑地区金矿成矿规律总结的基础上,提出了宁镇地区寻找金矿的前景.结合区域地质演化和中生代岩浆活动特征,建立了该区金矿成矿作用模型.与长江中下游西段铁铜金等成矿作用相仿,本区金矿的形成与燕山期岩浆期后热液活动密切相关. 相似文献
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小秦岭东闯金矿构造控矿规律及矿化趋势分析 总被引:1,自引:0,他引:1
小秦岭金矿田是我国重要的金矿聚集区,东闯金矿是其中典型的碰撞造山带石英脉型金矿之一,其形成受控于秦岭造山带的构造作用机制,主成矿期为燕山期,金矿的形成、演化与分布严格受构造活动尤其是断裂构造的控制.通过对东闯金矿矿床地质、构造特征、成矿期次的研究,对主要矿脉507脉的矿化趋势的分析,建立起矿田构造活动与成矿过程的时空演化关系,总结了矿脉(体)产出受断裂构造控制的机制与规律.这对属于危机矿山的东闯金矿的深部找矿具有现实意义. 相似文献
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大巩山金矿床在大地构造上处于中朝地块东南缘的蚌埠隆起东段,郯庐断裂带的两条次级断裂——朱顶-石门山断裂和五河-红心铺断裂所夹持的部位.矿区内出露五河群最下部的西堆组,并构成蚌埠复背斜的核部,断裂有北北东向、南北向、北西西向和北东向4组.南北向断裂在宏观上控制金矿体的产状和规模.向西缓倾的南北向断裂控制石英脉型金矿体的发育和产出,而向东陡倾的南北向断裂控制构造蚀变岩型金矿体的产出,这是与不同时期南北向断裂成生演化和岩浆活动作用密切相关的,也与该区及邻区成矿年代学研究成果相一致. 相似文献
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铜石金矿化集中区金矿形成与铜石次火山杂岩体有关,受铜石破火山口构造控制,五种矿化类型产于不同的构造部位,受不同的断裂系统控制。其中似层状浸染状灰岩中金矿化受杂岩体外侧的北西向断裂控制;隐爆角砾岩带型金矿受杂岩体边部放射状断裂控制,隐爆角砾岩筒型金矿受杂岩体边部放射状断裂与东西向断裂交汇联合控制;古溶洞型金矿受与断裂有关的古溶洞构造控制;斑岩中的金矿化则与杂岩体中心部位的放射状断裂活动有关。提出了次火山杂岩体边部受断裂控制的隐爆角砾岩筒以及外缘张性断裂发育区是今后在该区重要的找矿方向。 相似文献
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《大地构造与成矿学》2016,(2)
甘肃早子沟金矿床位于西秦岭地区,其成矿作用与断裂构造活动及中性岩脉的侵位关系密切,但成矿前期构造控矿作用研究相对较为薄弱。开展早子沟金矿的控矿断裂构造特征及其与金矿化的关系研究,可为分析矿床成矿机制、进一步开展地质找矿工作提供指导。早子沟金矿区主要发育4组不同方向的控矿断裂,根据断裂的相互切割关系推测,NW向断裂形成最早,SN向和NE向断裂次之,近EW向断裂形成最晚。矿区金矿体主要赋存于断裂破碎带中,金矿化及其展布特征显示,NE向断裂控制的矿体成矿早,矿体规模最大;受近EW向断裂控制的矿体发育两期矿化,矿化强度高。结合区域大地构造演化及断裂构造活动与金成矿作用关系分析,认为区域性的夏河–合作断裂构造带控制了早子沟金矿床的产出,早子沟矿区内不同方向的次级断裂多期次的活动叠加控制了金矿体的产出;推测早子沟金矿床两阶段的断裂活动控制了两阶段的金矿化作用,从而建立了早子沟金矿控矿构造的形成与演化模式。认为矿区下一步勘查工作重点应放在NE向断裂深部和近EW向断裂控制的缓倾斜矿体,尤其是近EW向断裂与其他控矿断裂交汇部位,是寻找叠加矿化富矿段的有利找矿地段。 相似文献
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长城式金矿是近几年在冀东地区发现的一种新的金矿类型,该类型金矿产在中元古界碳酸盐岩及碎屑岩地层中,文章阐述了金矿床的硫、铅、氢、氧、碳等同位素地球化学特征,从而提供了矿床成因信息。 相似文献
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新疆西准包古图地区铜金矿成矿规律浅析 总被引:27,自引:0,他引:27
通过对西准包古图地区铜金矿床(点)地质特征分析,认为该区铜金矿属与中酸性小岩体有关的铜金矿成矿系列,自岩体至围岩岩石蚀变、矿床类型、成矿元素组合均具一定的分带性,对该区铜金矿的成矿规律和成矿机制进行了初步探讨,在此基础上指出了该区进一步的找矿方向. 相似文献
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安化廖家坪金矿床地质特征及成矿规律 总被引:1,自引:0,他引:1
廖家坪金矿床属江南地轴东南缘桃江-城步锑金多金属成矿带的一部分,以NE向桃江-城步深断裂为导矿构造,以长度>2km,地层断距>200m的矿区主干断裂为配矿构造,以早期NWW向剪切劈理带中叠加的长度<1km,地层断距不明显的次级断裂破碎带为容矿构造,矿区38条金矿脉构成两个含矿带8个矿脉群,含矿带的分布与地层岩性有一定关系,矿脉群的分布与早期花岗斑岩脉关系密切,金矿脉主要有4组,NNE向组最发育,NWW向组规模最大,矿化富集与围岩蚀变种类及强度,矿脉交切部位及产状变化段关系密切,根据区域成矿地质条件,金矿床成矿规律,指出湘中地区有廖家坪、白云铺、三德堂矿区及外围和古台山地区4个廖家坪式金矿床找矿远景区。 相似文献
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《Chemie der Erde / Geochemistry》2021,81(4):125774
Recognition of geochemical anomalies is a pivotal assignment in exploration projects. This study aims to delineate different AuCu geochemical anomalies using number-size (N-S) and concentration-area (C-A) multifractal models in the Siah Jangal area, SE Iran. In this research, lithogeochemical datasets were applied for the exploration of Au and Cu. A comparison between geochemical anomaly maps based on the N-S and C-A fractal models shows the N-S fractal modeling is a powerful tool for separation of weak elemental geochemical anomalies in all of sampling zones. Based on a comparison between the results of these two methods and field studies, the geochemical anomaly zones, defined by the N-S fractal model, are more accurate than those recognized by the C-A fractal model. The obtained results of the N-S and C-A fractal models have been interpreted with the extensive set of information including structural interpretation, geological and alteration data. Au and Cu mineralization in the Siah Jangal area are hosted mainly by Oligocene-Miocene sub-volcanic rocks, especially strongly altered porphyric quartz diorite, hornblende diorite and diorite. Moreover, the positive dependence between various alteration zones and high concentrations of Au and Cu proves that strongly anomalous areas are correlated with these alteration zones. High grade Au (> 1000 ppb) and Cu (>150 ppm) are associated with the altered sub-volcanic rocks in the northern, eastern, and SW parts of the study area. Therewith, the strong anomaly populations are mostly occurred within the fault and fracture systems in the study area. This is a promising signal because quartz-sulfide veins and veinlets are associated with such structures. 相似文献
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陕西山阳县香沟—夏家店金成矿带,是南秦岭地区重要的金多金属成矿带,产出有王家坪金矿、龙头沟金矿、香沟金-钨矿、夏家店金矿等矿床;在金矿的勘查和研究中均发现Ba元素异常或重晶石化是重要的找矿标志之一。本文通过矿床地质资料对比分析,结合龙头沟金矿、香沟金矿和桐树沟金矿重晶石的电子探针测试研究,发现重晶石中具有一定的金、银矿化特征,尤其是桐树沟金矿区内重晶石中显示一定的金异常(w(Au)=0.03%),同时具有Sb、Cu、Mo、Bi元素异常,与矿区金异常化探元素组合特征一致,有同期矿化的特点。重晶石化或Ba元素化探异常与金化探异常叠加部位均已发现金矿体(金矿床)。结合研究区区域磁异常带是构造岩浆活动带的认识,认为重晶石是深部成矿热液反复活动的指征;在山阳县桐树沟金矿—磨房沟金矿一带和商南县青石沟、过凤楼地区还具有发现金矿床的潜力。 相似文献
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吉林东部地区与火山岩-斑岩有关的金(铜银)矿床可分为浅成低温热液型金(银)矿和浅成中温斑岩。热液型金(铜)矿两个亚类。浅成低温热液型矿床的特征矿物组合为黄铁矿、石英、方解石、冰长石和重晶石,成因上与高钾的钙碱性火山岩。斑岩(137~177Ma)有关,成矿流体属浅成低温氧化流体,在成矿过程中大气降水混入的程度大。浅成中温斑岩,热液型矿床的特征矿物组合为黄铁矿、黄铜矿、磁黄铁矿和石英,成因上与钙碱性火山岩。斑岩(130~140Ma)有关,成矿流体属浅成中温还原流体,在成矿过程中大气降水混入的程度相对较小。由于火山岩,斑岩的来源深度不同,斑岩体在矿床的形成中所起的作用不同,成矿流体的性质不同,造成金矿床的类型不尽相同。 相似文献
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中亚造山带中斑岩铜钼矿的Re,Pt,Pd和Au含量 总被引:1,自引:1,他引:1
Anita N.Berzina Alexander F.Korobeinikov 《岩石学报》2007,23(8):1957-1972
Precious metal(Pt,Pd and Au)and Re contents in rocks,ores and flotation concentrates of Siberian(Russia)andMongolian porphyry Cu-Mo and Mo-Cu deposits were studied.The following deposits are discussed:Early Devonian porphyry Mo-CuSora deposit(Kuznetsk Alatau Mountains,Russia)and porphyry Cu-Mo Aksug deposit,(northeastern Tuva,Russia);Triassicporphyry Cu-Mo Erdenetiin Ovoo deposit(northern Mongolia).The samples analyzed include unaltered host rocks of plutons,porphyryrocks of ore-bearing series,different types of altered rocks,mineral separate analyses of molybdenite,chalcopyrite and magnetite,aswell as flotation concentrates.Pt,Pd,Au and Re contents were determined using ICP/MS,AAS and inversion voltammetric analysis.PGE abundances in rocks and poorly mineralized samples span a large range from below detection limit to 65 ppb Pt and 74 ppbPd.Re concentrations in whole rock samples range from below detection limit to 89 ppb.Molybdenite has been shown to be the majorhost phase for Re.The results presented show that Aksug deposit reveals elevated PGE and Au contents in ore minerals and flotationconcentrates.High Pd contents in ores of the Aksug deposit are in accordance with the presence of palladium mineralization in the formof palladium telluride merenskyite(Pd,Pt)Te_2.The variety of precious metals and Re contents in the studied deposits could be caused by a complex interplay of several factors,including importance of primary metal concentrations derived from the source,transport of metals to the deposition area,physicochemical properties of the fluid(fo_2,pH,fs,T,P),and depositional conditions.Higher Re contents in molybdenite andchalcopyrite separates are typical for copper-rich Aksug and Erdenetiin Ovoo deposits.Rhenium concentration in sulfides frommolybdenum-rich Sora deposit is significantly lower.Highly oxidized,Cl-rich fluid style at Aksug and Erdenetiin Ovoo was favorable forhigh rhenium solubility and transport to depositional area.The occurrence of significant precious metals contents at Aksug were likelydue to:1)PGE and Au enriched source,2)favorable fluid style(high fo_2,high Cl-activity),promoting high solubility andtransportation of precious metals in ore-forming fluid as chloride complexes;3)moderately reducing depositional conditions from PGE-bearing solutions containing As and Te,facilitating PGM deposition.As for the porphyry systems at the Sora and Erdenetiin Ovoodeposits,they were probably devoid of precursors favorable for the enrichment in PGE and Au or the role of such precursors wasinsignificant. 相似文献