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1.
新疆塔吾尔别克金矿床位于西天山吐拉苏金-多金属矿集区,北距阿希金矿仅2.5km;金矿产于下石炭统大哈拉军山组上部的安山质熔岩和火山碎屑岩中,金矿化分别产于5条构造蚀变带内,宏观上受NW向构造破碎带的控制,同时还受到爆破角砾岩、隐爆角砾岩和次火山岩相斑岩体的联合制约;在金矿形成过程中,与早石炭世火山活动有关的地层、构造(火山机构和断裂构造)、次火山相斑岩和围岩蚀变对成矿具有程度不同的控制作用。文章认为,在进一步的找矿工作中,需要从找矿的广度和深度两方面拓展找矿范围,总结多类型(浅成低温热液型、斑岩型和角砾岩型)金矿床的复合成矿规律,探索矿体深部由金向铜(多金属)的矿化分带规律,深入挖掘矿床的成矿潜力;根据矿区成矿潜力的分析结果,预测了7处可供进一步找矿的勘查靶区。  相似文献   

2.
郝国强 《矿产与地质》2009,23(3):238-242
文章通过对内蒙古翁牛特旗二把伙银多金属矿区地质特征综合分析,认为矿区成矿作用类型为与火山穹窿构造形成有关的隐爆角砾岩成矿,成矿作用受断裂构造和火山机构双重控制;从浅表至深部,矿床类型依次为浅成低温热液型、裂隙充填隐爆角砾岩型和斑岩型(隐爆角砾岩筒型)。为二把伙银多金属矿区深部找矿提供了理论依据。  相似文献   

3.
通过对矿区地层条件、构造条件和次火山侵入岩条件调查研究,平行敦密断裂的金场沟断裂(带)控制着次火山侵入岩和其中的角砾岩筒构造的分布,而角砾岩筒构造直接控制着铜钼矿的产出.其中铜钼矿化与花岗闪长斑岩有关,外围金银矿化与石英闪长岩有关.同时总结了成矿规律与进一步找矿方向.  相似文献   

4.
文章阐述了东山湾钨钼矿区成矿地质背景和矿区地层、构造、侵入岩及矿化蚀变带、矿体、矿石特征,在此基础上重点分析了断裂、火山构造、复式花岗斑岩体、赋矿围岩及热液蚀变对本区成矿的控制作用,并指出了小汉山破火山周边及矿区南部的找矿方向。  相似文献   

5.
江西银山铜铅锌矿床成矿特征   总被引:2,自引:1,他引:2  
本文主要从控矿构造和矿化分带两个侧面,探讨银山铜铅锌矿床的成矿特征,以期指导矿山生产,提出找矿方向。矿区地质概况矿区位于中生代德乐火山盆地的东北缘、赣东北深大断裂的西侧。北东向的银山倾伏背斜—断裂带(以下简称轴部构造)纵贯全区,控制了本区火成岩的侵入、喷发、喷溢、爆破及成矿。震旦亚界双桥山群浅变质岩系广布全区,由绢云母千枚岩与砂岩千枚岩互层组成,片理发育,走向北东东—北东(与层理一致)(图1)。侏罗系上统鹅湖岭组下部的火山岩系沿轴部构造分布,  相似文献   

6.
丰宁县北部有大面积燕山期火山岩分布,通过航磁及物化探资料综合分析,和顺店附近存在一个隐爆火山角砾岩筒,伴随着火山—侵入活动,火山口附近及其周围形成一系列环形断裂构造,加上区域构造运动的叠加,为深部含矿热液的运移提供了通道和储矿空间。近期的找矿实践证明,在火山构造的北部及东部已经发现了Ag、Pb、Zn多金属矿化,并有望形成具有经济价值的工业矿体,综合分析该区成矿地质条件,在火山构造的南部及西部有望实现找矿工作的新突破。  相似文献   

7.
在长城岭铅锌多金属矿区,常见沿花岗斑岩脉与北东向断裂交汇处发育与成矿关系密切的角砾岩。这类角砾岩的空间就位、物质组成、岩石组构及蚀变特征等表明其为隐爆成因,可划分为爆破角砾岩、震碎角砾岩和混杂角砾岩。按照隐爆机制的不同,其又可分为岩浆隐爆角砾岩和热液隐爆角砾岩。区内花岗斑岩的地质地球化学特征表明,燕山早期晚阶段侵入的富含挥发分、流体-溶体相互作用强烈的浅成花岗斑岩具备有利的隐爆条件和明显的隐爆特征。隐爆作用不仅为铅锌多金属矿化富集提供物源及流体源,还为成矿流体汇聚及卸载沉淀提供了重要场所。长城岭地区与铅锌多金属成矿关系密切的隐爆角砾岩的发现对其矿区深部、湘南钨锡多金属矿化集中区乃至南岭中段有色金属找矿研究具有重要意义。  相似文献   

8.
双王金矿床是秦岭地区大型的危机矿山之一,找矿工作是当务之急,但其成因类型特殊,人们对其成矿构造的演化过程和控矿机制尚存在争议.以该矿床KT5矿体为例,研究了角砾岩体、断裂裂隙和金品位的空间分布关系,并结合趋势面分析,探讨了金矿化富集规律及其对成矿构造的指示意义.矿床地质特征及对矿区内基性岩墙的测年结果表明其成矿时代为印支期.在印支期秦岭造山过程中的NS向主压应力背景下,成矿断裂早期右行斜向剪切作用奠定了角砾岩带的雏形;断裂中期活动引发的地震及伴生液压致裂作用,使矿区内形成了角砾岩主体和断裂裂隙系统,主成矿阶段角砾岩化作用减弱,断裂裂隙持续发育,并作为流体运移和成矿的主要通道和有利部位,使金的矿化富集呈面状展布,断裂裂隙带的产状变化是金沉淀的重要影响因素;晚期构造应力转换为近EW向拉伸,近NS向基性岩墙群侵位并受到成矿流体的改造.   相似文献   

9.
鸡东金场沟铜钼、金矿化区控矿条件与找矿方向   总被引:3,自引:1,他引:2  
经对黑龙江鸡东金场沟矿区地层条件、构造条件和次火山侵入岩条件的分析, 指出环形构造控制着与成矿有关的次火山侵入岩和角砾岩筒的分布, 角砾岩筒构造控制着铜钼矿体的产出。区内银金矿的形成与石英闪长岩有关, 而铜钼矿的成矿作用与花岗斑岩有关。在控矿条件分析的基础上建立了本区的铜钼多金属成矿模式, 指出了找矿方向。  相似文献   

10.
滇西云县红豆山铜矿构造地球化学特征及找矿预测   总被引:1,自引:0,他引:1       下载免费PDF全文
文章系统总结了南澜沧江火山弧成矿带成矿条件和红豆山矿区地质特征,以1272、1220中段为研究对象,开展了构造地球化学研究。依据构造岩样品采集分析数据,应用R型聚类分析、因子分析圈定矿化元素组合异常,发现该异常分布在矿区NE向F1断裂和NWW—近EW向F3断裂控制的蚀变岩中,由断裂→围岩依次出现高温→低温的异常分带现象,指示成矿流体的运移方向、矿体产状信息,为深部找矿预测提供了重要依据;通过构造控矿规律和构造地球化学研究,预测了NE向矿体产状及其深部延伸情况,在1272中段圈定了NWW—近EW向断裂控制的矿体,预测了矿体的产状及深部延伸情况,经工程验证在异常分布区及深部预测靶区取得较好找矿效果:圈定预测铜矿体且向深部延伸稳定,资源量约5万t,受构造控制的岩浆热液型矿体有达中型铜矿的前景。  相似文献   

11.
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.  相似文献   

12.
Robert L. Linnen   《Lithos》2005,80(1-4):267-280
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.  相似文献   

13.
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.  相似文献   

14.
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).  相似文献   

15.
《地学前缘(英文版)》2014,(3):I0001-I0003
正1 AIM AND SCOPE GEOSCIENCE FRONTIERS(GSF) is a bi-monthly international journal that publishes in English high quality original research articles and timely reviews in interdisciplinary fields of Earth and Planetary Sciences.GSF aims to bridge innovative,provocative and challenging concepts and models related to various fields of research including petrology and geochemistry in understanding lithospheric architecture  相似文献   

16.
正1 Introduction In the present paper,MgCl2·6H2O,FeCl3·6H2O,and CeCl3·6H2O were used as raw materials in the precipitationhydrothermal method to synthesize MgF eC e hydrotalcite.The effects of the Fe:Ce molar ratio on the composition,crystal structure,and thermal stability of hydrotalcite are examined.Energy-dispersive X-ray spectroscopy(EDS),X-  相似文献   

17.
正20141430 Chen Ji(Key Laboratory of Petroleum Resources,Chinese Academy of Sciences,Lanzhou 730000,China);Shi Ji’an Sedimentary Facies and Models for the Palaeogene-Neogene Deposits on the Northern Margin of the Qaidam Basin,Qinghai Province(Sedimentary Geology and Tethyan Geology,ISSN1009-3850,CN51-1593/P,33(3),2013,p.16-26,14 illus.,16 refs.)  相似文献   

18.
SEISMIC GEOLOGY     
正20141967An Zhanghui(Lanzhou Base of Institute of Earthquake Prediction,CEA,Lanzhou 730000,China);Du Xuebin Study onthe Geo-Electric Field Variation of Sichuan Lushan MS7.0and Wenchuan MS8.0Earthquake(Chinese Journal of Geophysics,ISSN0001-5733,CN11-2074/P,56(11),  相似文献   

19.
GEOCHEMISTRY     
正20141357 Guo Tao(School of Mathematics and Science,Shijiazhuang University of Economics,Shijiazhuang 050031,China);Hu Jiawen Assessment on the New Pressure-Volume-Temperature(PVT) Data of Supercritical Water(Geological Journal of China Universities,ISSN1006-7493,CN32-1440/P,19(3),2013,p.447-455,9 illus.,3 tables,32 refs.)Key words:supercritical fluids  相似文献   

20.
正20141074Bao Xijie(Research Institute of Exploration and Development,Daqing Oilfield Company,PetroChina,Daqing 163712,China)Gather Optimal Processing and Application Effect of Prestack AVA Instantaneous Inversion  相似文献   

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