共查询到19条相似文献，搜索用时 218 毫秒
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作者将我国产于泥盆—石炭系不纯碳酸盐岩建造中,矿床受层位和构造双重控制、矿体和矿石既表现出同生沉积成岩成矿特征又反映有后生强热改造迭加成矿特征,没有或很少受岩浆热液影响的铅锌矿床称之为凡口式层控铅锌矿.本文以广东凡口特大型富铅锌矿床为例,论述其同生沉积—成岩成矿和后期改造富集成 相似文献
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四川省宁南县跑马铅锌矿成因浅析 总被引：2，自引：0，他引：2
跑马铅锌矿为产于下寒武统麦地坪白云岩中的层控矿床，主要受层间破碎带控制，有两个含矿层，多呈层状产出。麦地坪段在沉积过程中铅、锌相对富集形成源层，经后期热液叠加改造富集成矿，为沉积改造型似层状（不规则状）铅锌矿床。 相似文献
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有关本区矿床成因先后有同生沉积、低温超低温热液、沉积改造等不同看法。本文根据宏观、微观资料的初步分析认为,本区铅锌矿床属于后成深循环热卤水成因——后成层控矿床。本文将对这一问题进行讨论。 相似文献
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本文就不同学者所提出的层控矿床分类方案进行了综合评述,论述了作者们近年来研究湖南省泥盆系层控矿床提出的一种新的分类方案,将其分为沉积—改造型(简称改造型)、后成渗滤热液型(简称渗滤型)和岩浆热液叠加型(简称叠加型)三大类;然后根据矿种及成矿元素组合分成若干类,再根据矿体形态及矿体与赋矿地层的整合关系分成若干小类。并就湖南省泥盆系内产出的矿床作了具体划分,总结了各类矿床的特点与区分标志。改造型矿床主要是黄铁矿床,矿质来自泥盆系,成矿受沉积相和同沉积断裂控制,渗滤型矿床主要为铅锌、锑、金矿床,矿质来自下伏岩层,成矿受成岩后长期活动断裂控制,叠加型矿床主要为钨、铅锌、磁黄铁矿等矿床,矿质主要来自燕山期岩体,成矿受燕山期断裂和岩浆作用控制。该分类对指导层控矿床的找矿勘探具有重要意义。 相似文献
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云南华宁-峨山地区震旦系沉积岩铜矿床成因 总被引：1，自引：0，他引：1
云南震旦系沉积岩铜矿是产于红色碎屑岩系中的沉积叠加热液改造型铜矿床,矿床产在上震旦统陡山沱组灰白色砂岩,白云岩,泥灰质页岩中,具有明显层控特征。地球化学分析表明,震旦系碎屑岩中铜富集系数明显高于正常壳源沉积岩,因此加里东期后生改造矿化物质直接来自下部红色沉积岩层的淋滤迁移,最终在氧化还原过渡带与同生富集矿层叠加。 相似文献
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Abstract: The Gunga barite deposits occur in carbonate clastic marine sequence of Jurassic age. These rocks are widely spread in Khuzdar-Lasbela belt which host important stratabound barite and zinc-lead deposits of Pakistan. These rocks are intricately folded and extensively faulted. The Gunga are low temperature hydrothermal deposits occurring as a series of disconnected lenses a few meters thick. Two mineralized horizons are recognized: barite in the upper zone, sphalerite and galena in the lower zone. Four types of barite mineralization occurs in Gunga stratabound replacement associated with 1) fracture filling, 2) open space fillings in solution collapsed breccia, 3) replacement in fault, and 4) veinlets associated with all these three types. The wall rocks of the Gunga deposits have also been altered by silicification, leaching and ferruginization.
The sulfur isotope values of most of the Gunga barite samples range from 23.8 to 27.8 per mil with an average of 26.4 per mil, which is very close to the average of isotopic values of epigenetic carbonate hosted Late Paleozoic Missouri barite deposits. The Gunga like other barite and sulfide deposits of Khuzdar-Lasbela belt are Mississippi Valley type, stratabound and of replacement origin precipitated from connate brines expelled during the incipient rifting of India from Gondwana land in the Late Jurassic and Early Cretaceous periods. The low content of copper, lead and zinc in the Gunga barite deposits suggests that these deposits were not formed in proximity to an igneous source of the ore solution.
The Gunga deposits are epigenetic and stratabound as their mineralization is structure controlled. There is an evidence of transgressive nature of host rock and wall rock alteration which are absent in stratiform or bedded deposits. 相似文献
The sulfur isotope values of most of the Gunga barite samples range from 23.8 to 27.8 per mil with an average of 26.4 per mil, which is very close to the average of isotopic values of epigenetic carbonate hosted Late Paleozoic Missouri barite deposits. The Gunga like other barite and sulfide deposits of Khuzdar-Lasbela belt are Mississippi Valley type, stratabound and of replacement origin precipitated from connate brines expelled during the incipient rifting of India from Gondwana land in the Late Jurassic and Early Cretaceous periods. The low content of copper, lead and zinc in the Gunga barite deposits suggests that these deposits were not formed in proximity to an igneous source of the ore solution.
The Gunga deposits are epigenetic and stratabound as their mineralization is structure controlled. There is an evidence of transgressive nature of host rock and wall rock alteration which are absent in stratiform or bedded deposits. 相似文献
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层控矿床形成必须具备二个基本条件:矿源层和矿质富集作用(本文称其为地质驱动作用),二者缺一不可。本文着重分析了我国东南部地区不同时期的矿源层形成的构造环境和各种地质驱动作用及其所形成的矿床特点。 相似文献
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南秦岭柞山地区铜矿成矿类型、成矿规律及找矿预测 总被引：2，自引：0，他引：2
[摘 要]南秦岭柞山地区位于陕西省东南部,其西起柞水县,东到山阳县,面积约3000km2。其地处南秦岭海西-印支褶皱带东段,主体夹持于商丹缝合带与凤镇-山阳大断裂之间。作者总结了区域成矿地质背景,对热卤水喷流沉积型铜(银铅)矿、沉积-改造层控型铜矿、热液脉型铜(镍)矿、矽卡岩型铜(铁)矿、震裂岩型铜矿、斑岩型铜(钼、金)矿等6 种铜矿成矿类型的特征进行了探讨,在此基础上阐述了柞山地区铜矿的成矿规律,指出热水喷流型铜矿、斑岩型铜矿、沉积-改造层控型铜矿最具找矿潜力。目前已知的矿床(点)均受具导浆、导热、导流、导矿功能的区域性凤镇-山阳大断裂控制,并沿其两侧展布。未来一段时期,柞山地区铜矿找矿主攻类型为热水喷流型铜矿、斑岩型铜矿、沉积-改造层控型铜矿。找矿靶区首推柞水县银洞子矿床深部、山阳县池沟铜矿点、柞水县冷水沟铜矿点,次为柞水县张家坪铜矿点、山阳县色河铺铜矿点。通过进一步勘查有望取得铜矿找矿的重大突破。 相似文献
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In the eastern Sierras Pampeanas, Central Argentina, tourmalinites and coticules are found in close association with stratabound scheelite deposits in metamorphic terranes. In Sierra Grande (Agua de Ramón and Ambul districts) and Sierra de Altautina, tourmalinites are associated with stratabound scheelite deposits related to orthoamphibolites. In the Pampa del Tamboreo area, tourmalinites are located in biotite schists stratigraphically related to acid to intermediate metavolcanic rocks and scheelite-bearing quartzites.The mineral chemistry and boron isotopic compositions of tourmalinite-hosted and vein-hosted tourmalines are investigated. Overall, the tourmalines belong to the dravite-schorl series and are generally aluminous; Fe/(Fe+Mg) ranges from 0.33 to 0.85, Al/(Al+Fe+Mg) from 0.66 to 0.76 and the amount of X-site vacancy (0.12–0.48) indicates significant foitite components. Their boron isotopic compositions (δ11B) are from −24.0‰ to−15.0‰.Similar mineral chemistries and boron isotopic values for tourmaline in tourmalinites related to stratabound scheelite mineralisation and in tungsten-bearing quartz veins suggest a common source for the boron and probably the tungsten. The field, chemical and isotopic relationships are consistent with tungsten and boron in quartz-vein deposits being remobilised from stratabound scheelite and tourmalinite, dominantly by liquid-state transfer associated with regional shear zones. Tungsten and boron in the original sedimentary sequence (now meta-exhalites) are ascribed to volcanogenic exhalations. 相似文献
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秦岭造山带泥盆系(陕西段)主要金矿床地球物理地球化学异常特征及找矿标志 总被引：4，自引：0，他引：4
以构造控矿和热液喷流沉积加后期改造的成矿观点,对秦岭造山带泥盆系(陕西段)主要层控金矿床的地球物理地球化学异常特征进行总结,从矿床地质分析入手,在充分认识泥盆系金矿成矿规律的基础上,提出该类金矿床的综合找矿标志. 相似文献