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太行山北段阜平幔枝构造成矿作用研究 总被引：3，自引：0，他引：3
阜平幔枝构造北东倾伏端，是轴部乌龙沟－上黄旗韧脆性剪切带与外围主拆离滑脱带的交汇部位，断裂构造发育，岩浆活动强烈，成矿控矿有利，矿床类型多样。笔者以上明峪主拆离滑脱带型金矿、镰巴岭上盘盖层裂隙型铜铅锌矿和支家地上叠断陷盆地中次火山岩裂隙型银矿为例，讨论了幔枝构造外围主拆离滑脱带、上盘盖层密集裂隙带和上叠断陷盆地次火山岩构造的成矿控矿作用，总结成矿规律，归纳成矿模式。 相似文献
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桂林市褶皱构造对岩溶塌陷的控制作用 总被引：6，自引：0，他引：6
对桂林市褶皱构造的几何形态、应力状态及裂隙发育特征研究表明,背(向)斜的轴(核)部、倾伏端(扬起端)及指状分叉钳口处是岩溶塌陷发育的有利构造部位.本区654个岩溶塌陷,近20%发生在剥蚀深度不大且地势低洼的背斜轴部、倾伏端、指状分叉钳口处,以及埋藏深度较浅的向斜核部和扬起端.市区东西两侧近SN向的尧山背斜和塘家湾背斜等,控制了本区岩溶塌陷总的水文构造环境. 相似文献
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湘中锡矿山式锑矿成矿地质条件分析 总被引：3，自引：0，他引：3
湘中锡矿山式锑矿形成于晚白垩-古新世,空间上与岩脉关系密切,各锑矿床、矿化点都伴有或附近发育有煌斑岩及中-酸性岩脉群,在锑矿成矿同期地质事件中,还有周缘一些中-新生代红色盆地的形成及基性火山岩喷发,据之,提出湘中锡矿山式锑矿成矿与燕山晚期拉张构造-岩浆活化作用有关.锑矿床(点)基本上都产出于两组或两组以上断裂的交汇点附近,3组断裂的交汇部位对应于最主要的锑矿床(点).矿体具体受断裂交汇部位附近的次级短轴背斜轴部、倾伏背斜的倾伏端及其翼部被纵向陡倾角断裂构造所切穿的部位控制,是断裂导矿与背斜构造圈闭的体现.岩性组合控矿表现为易于硅化蚀变交代的砂质碳酸盐岩与隔挡层泥质岩所构成的岩性圈闭.根据包裹体均-温度和盐度测定成果,推算成矿压力为(200～300)×105Pa,成矿深度约为1 km. 相似文献
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内蒙古苏尼特左旗两种不同成因类型金矿 总被引：1，自引：0，他引：1
在内蒙古苏尼特左旗南部,近年来发现了白音宝力道和巴彦哈尔等多处金矿床。白音宝力道金矿位于苏尼特左旗蛇绿混杂岩带北侧,而巴彦哈尔金矿位于该蛇绿混杂岩带西部。苏尼特左旗蛇绿混杂岩带被认为是西伯利亚板块与华北板块之间的苏尼特左旗-贺根山缝合带的组成部分。通过综合研究认为,苏尼特左旗存在两种不同成因类型的金矿:一种是以白音宝力道金矿为代表的、与形成于早古生代岛弧的花岗斑岩有关的中温热液型金矿;另一种是以巴彦哈尔为代表的、与侵入于蛇绿混杂岩带中的晚古生代中晚期花岗斑岩有关的浅成低温热液型金矿。 相似文献
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Gold is commonly associated with arsenic in Asrich pyrite or arsenopyrite in a variety types of gold deposit, such as sediment-hosted gold deposits, epithermal Au-Ag deposits, Au-rich VMS deposits, and mesothermal lode gold deposits (Ciobanu and Cook,2002; Pals et al. , 2003; Zacharias et al. , 2004;Wagner et al. , 2007; Large et al. , 2009). 相似文献
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从"景"、"场"、"相"、"床"4个等级体制观点出发,阐述了该金属成矿省成矿内部组成,观点新颖。金矿赋存于中新世-更新世马林丹群火山岩中,该群火山岩呈零星岛状散布于斯丹岗-哥塔巴托-大姑玛线性构造活动带(SCDL)的东部,并受到后期安山玢岩的侵入。安山玢岩具有埃达克岩性质,它的侵入对于后期的围岩蚀变和成矿作用起到重要的控制作用。拉拉布矿床的安山岩具有明显的热液蚀变,属于冰长石-绢云母型金矿化,认为金是在PH值近中性的浅表环境中由于热液沸腾并伴随流体的混合沉淀而成,通常富集于标高30~200m之间。围岩蚀变强度大,并有明显的分带规律,制约着金矿的形成。金的富集与下列地质事件相关:(1)形成角砾岩之前的围岩蚀变作用;(2)热液角砾岩的形成;(3)形成角砾岩后的围岩蚀变作用;(4)金矿形成。 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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与火山—次火山—侵入—热液作用有关的金矿床分类探讨 总被引：7，自引：0，他引：7
讨论近年来在陆相火山－次火山－侵入－热液作用有关的金矿床分类中的一些争论问题。从具体资料出发，认为扩大浅成代温热注作用的范围，摒弃中温热液和高温热液矿床，以及经它们与斑岩矿床的关系是不妥当的；认为斑岩和系列是建立成矿模式，划分有产矿床的基础。 相似文献
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A. V. Volkov N. E. Savva A. A. Sidorov V. Yu. Prokof’ev N. A. Goryachev S. D. Voznesensky A. V. Al’shevsky A. D. Chernova 《Geology of Ore Deposits》2011,53(1):1-26
The Shkol’noe deposit is localized in a small granitoid stock, the root portion of which is traced using geophysical data
to a depth of 5–8 km. The high-grade gold ore (33 gpt Au) is enriched in silver and principally differs in ore composition
from the previously studied mesothermal gold-quartz and epithermal gold-silver deposits in the Russian Northeast. The main
reserves of the Shkol’noe deposit concentrate in bonanzas (20% of the total volume of orebodies). The internal deformation
is related to the rearrangement of matter in freibergite; exsolution structures in fahlore and native gold are related to
postmineral metamorphism. It is suggested that the ore of the Shkol’noe deposit occupies a transitional position between porphyrytype
and epithermal levels of ore deposition. 相似文献
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应用壤中气汞量测量找金的效果——以湖南青京寨、三德堂金矿为例 总被引：2，自引：0，他引：2
湖南青京寨和三德堂分别为破碎带蚀变岩型，残积红土型金矿床。地表存在较厚的残（坡）积覆盖层，应用壤中气汞量测量法寻找隐伏含Au构造蚀变带及金矿体。区内气汞异常带及其峰值与隐伏含Au构造蚀变带及金矿体具有较好的对应性，利用这种对应性并结合区内地质，地球化学特征，施工适当的工程进行验证。在青京寨对6条气汞异常带进行工程揭露验证，各带均发现含Au蚀变带。三德常矿区圈定的金异异常与气汞异常基本一致。壤中气汞量测量法不仅适有于寻找中代温热液型金矿床，而且也适于寻找刚化残积型金矿床。 相似文献
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福建紫金山铜金矿床类型与环太平洋浅成低温矿床的比较 总被引：8，自引：0，他引：8
福建省上杭紫金山铜金矿床是我国大陆发现的首例高硫型浅成低温热液矿床,在矿床深 继发现了斑岩型铜矿、中低温热液型铜矿和低硫浅成热液型银（金、铜）矿。可与环太平洋带上一系列特大型斑岩铜金和低温热液型金（铜）矿对比,它们有若干共同特征,但紫金山矿床与它们的一些不同之处,启示我们开拓找矿的新的时空领域。 相似文献
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Some metallogenic features of gold and copper deposits related to alkaline rocks and consequences for exploration 总被引：12，自引：0，他引：12
Richard H. Sillitoe 《Mineralium Deposita》2002,37(1):4-13
Porphyry copper-gold, skarn copper-gold, sediment-hosted (Carlin-style) gold, breccia pipe, low-sulphidation epithermal gold, pluton-related (mesothermal or orogenic) gold vein and volcanogenic massive sulphide deposits associated with alkaline rocks are commonly broadly similar to those hosted by their calc-alkaline counterparts. In contrast, porphyry molybdenum-gold deposits are confined to alkaline igneous centres. Alkaline suites are notably deficient in high-sulphidation epithermal gold deposits and even in the advanced argillic lithocaps which host them. This is surprising, given that the required oxidised sulphur species are seemingly more abundant than in calc-alkaline igneous centres. Highly efficient buffering of acidic fluid by metasomatised alkaline rocks may offer a viable explanation. All types of intrusion-related zinc deposits also appear to be poorly developed in alkaline provinces. The characteristics of several gold and copper deposits associated with alkaline rocks, including the giant Porgera, Cripple Creek, Ladolam, Olympic Dam and Phalaborwa examples, are judged to diverge appreciably from their most closely related deposit types, rendering them arguably unique. Most of these aberrant mineralisation styles may be due to variations in magmatic-fluid compositional and liberation characteristics consequent upon the extreme diversity of ore-related alkaline magmas. Most types of gold and copper deposits developed in calc-alkaline provinces also constitute exploration targets in and around alkaline igneous centres, although porphyry copper-gold and low-sulphidation epithermal gold deposits are considered to possess the greatest potential. Perhaps of even greater interest, however, is the possibility of encountering unconventional giant gold and copper deposits which lack closely analogous examples. If already-defined aberrant deposits are truly unique, then exploration designed specifically to detect additional examples is pointless. Furthermore, exploration for new unique deposits is difficult because their defining geological parameters are unknown. Alkaline rocks within or behind calc-alkaline arcs at convergent plate boundaries probably offer the greatest exploration potential, although anorogenic intracontinental extensional settings should not be ignored. 相似文献