共查询到20条相似文献，搜索用时 66 毫秒
1.
2.
寨凹隐伏岩体是豫西南地区利用重磁资料解释推断的8个隐伏、半隐伏岩体之一，分布面积约310km2。豫西南地区主要钼（钨）铅锌银（金）矿床均分布于这8个隐伏、半隐伏岩体区及其边部附近，二者具有非常明显的时空关系。研究隐伏岩体分布形态、深度、产状和深大断裂构造分布，对指导深部找矿勘探具有重要意义。通过研究寨凹隐伏岩体重、磁场变化特征和分布规律，并通过相关定量计算，确定了隐伏岩体的侵入模型。将全区隐伏岩体分为三个区，Ⅰ区隐伏岩体顶面深度0~0.8km，分布面积约71km2，Ⅱ区隐伏岩体顶面深度0.8~2.0km，分布面积约153km2，Ⅲ区隐伏岩体顶面深度2~4km，分布面积约86km2。根据隐伏岩体侵入模型和典型矿床物探异常特征，建立了立体成矿模型（从浅至深从中低温成矿元素到高温成矿元素的过渡模型）和综合地球物理找矿模型（包括隐伏岩体、隐伏岩体顶上带、岩钟和斑岩体、矿体矿化体的地球物理异常标志）；预测了找矿潜力，总结了勘查方法技术组合；指出在Ⅰ、Ⅱ隐伏岩体分布区银（金）铅锌矿床的下部有寻找斑岩型钼、钨、铜矿产的潜力。 相似文献
3.
在详细分析区域成矿地质背景、区域成矿地质条件的基础上,笔者认为班公湖西段的多龙矿集区还有较大的斑岩Cu-Au矿床成矿前景和资源潜力。通过2013年一年的勘查工作,率先在铁格隆南取得突破,获得的铜资源量达到超大型矿床规模,使其一跃为多龙矿集区规模最大斑岩铜(金)矿床,成为2013年全国重大勘查突破之一。该矿床位于多龙矿集区中部早白垩世美日切错组火山岩分布区,成矿与早白垩世以浅成相侵入的花岗闪长斑岩、花岗斑岩及其相伴产生的热液角砾岩有密切时空关系。矿体主要产于下中侏罗统色哇组长石石英砂岩、岩屑砂岩夹深灰色至深黑色粉砂质板岩和成矿斑岩体中。矿体呈隐伏穹隆状,延深巨大,铜矿化呈网脉状、细脉状和浸染状,热液蚀变发育、分带明显,以硅化强烈、绢云母化以及广泛叠加的高级泥化蚀变为显著特征。矿区剥蚀程度甚低,地表只局部出现褐铁矿化和粘土化,但未见铜矿化,向深部蚀变矿化逐渐增强,矿化延深达千米未封闭。铜矿化上部表现为以辉铜矿-蓝辉铜矿-硫砷铜矿为特征的Cu-S体系,向下转变以斑铜矿-黄铜矿为特征的为Cu-Fe-S体系,铜矿化伴生Au、Ag矿化,并呈正相关关系,与多龙矿集区内其他斑岩Cu-Au矿床相比贫金。该矿床的勘查突破,为矿业公司勘查选区提供了范例,对区域找矿勘查具有重要意义。 相似文献
4.
南泥湖钼多金属矿田是中国重要的钼(钨)铅锌银多金属矿产地,已探明超大型钼(钨)矿床3处,大型钼(钨)矿床3处,中、大型铅锌银(金)矿床10余处。矿田具有优越的地质成矿条件,深部找矿潜力巨大。现有矿产勘查深度主要是500 m以浅范围,深部(500~2000 m)找矿工作基本为空白,需要使用综合地球物理方法研究深部成矿规律,预测新的矿产资源。文章通过研究该区地质、地球物理场特征和典型矿床物探异常特征,取得了有意义的研究成果。(1)确定了与成矿关系密切的隐伏岩体侵入模型:将全区隐伏岩体从南至北分为3个区,Ⅰ区隐伏岩体顶面深度0~800 m,分布面积约125 km~2;Ⅱ区隐伏岩体顶面深度0.8~1.5 km,分布面积约158 km~2;Ⅲ区隐伏岩体顶面深度1.5~3 km,分布面积约233 km~2。(2)建立了立体成矿模型(根据成矿空间位置的不同从地表向下分为4个空间成矿区)和综合地球物理找矿模型(包括隐伏岩体、隐伏岩体顶上带、岩钟和斑岩体、矿体和矿化体的地球物理场标志)。(3)指出隐伏岩体顶上带及其上方的岩钟、岩脉、岩枝和小斑岩体等是成矿有利部位。(4)预测了找矿潜力;总结了寻找钼钨铅锌银金矿产的勘查方法技术组合。研究成果对在该区和类似矿区进行深部找矿工作具有重要意义。 相似文献
5.
荣那铜矿是中铝矿产资源有限公司近年在斑岩型铜矿找矿方面取得的一项重大突破。矿床产于班公湖—怒江缝合带北侧岛弧带中。公司在找矿初期重视基础地质研究,加强对地调和矿调成果的二次解剖,借鉴国内外斑岩铜矿区域分布规律,结合1∶5万磁法异常,明确多龙矿集区重点找矿方向;根据前期勘查成果,结合1∶5万水系沉积物测量成果,确定荣那、拿若为重点验证区。通过总结国外斑岩铜矿蚀变模式、矿化模式和勘查模式,选择有效的激电勘查方法圈定重点验证地段。结合隐伏斑岩体系矿化中心为中低阻、负磁异常、中等极化率,外围发育黄铁矿化壳形成近似环状中高阻、正磁异常、中高极化率异常,最终确定外围正磁、中高极化环形异常系荣那矿床与青磐岩化带有关的黄铁矿化壳引起,负磁、中等极化率异常为矿化中心部位,通过选择合理网度进行钻探验证实现找矿突破。荣那矿床勘查过程中的理论思考,区域-矿田物化探异常的综合分析、有效方法的投入和验证工程的部署充分体现了科学研究与生产的有机结合。 相似文献
6.
羌塘南缘多龙矿集区荣那斑岩-高硫型浅成低温热液Cu-(Au)套合成矿:综合地质、热液蚀变及金属矿物组合证据 总被引：16，自引：12，他引：4
位于羌塘南缘多龙矿集区内的荣那斑岩-高硫型浅成低温热液Cu-(Au)矿床系近年来中铝西藏与西藏地质五队合作勘查取得重大找矿突破的铜矿床,控制资源量已达超大型规模,但对该矿床的成因类型仍存在争议。本文根据详细的钻孔岩芯、结合光学显微镜、扫描电镜观察、硫化物的电子探针分析,认为该矿床成矿与早白垩世花岗闪长斑岩有关。矿体主要产于下中侏罗统色哇组长石石英砂岩和成矿斑岩体中,矿体呈东西走向、南倾的隐伏状,延深巨大,金属矿化以铜为主,伴有金、银矿化,偶见钼矿化。热液蚀变具有两阶段蚀变:与斑岩型矿化有关的黑云母化、角岩化、硅化-绢云母化及硅化-伊利石-绿泥石化以上部叠加的高级泥化,蚀变分带明显。相应的该矿床具有斑岩型细脉浸染状矿化和以硫砷铜矿为特征的高硫型矿化,含铜矿物主要分为4个带,大致与蚀变分带相对应,下部主要为斑铜矿-黄铜矿;过渡带以斑铜矿-铜蓝组合为特征;中上部为蓝辉铜矿-砷黝铜矿-硫砷铜矿组合;顶部主要由为辉铜矿-蓝辉铜矿组成。总体上,矿床中上部为Cu-S体系、向下转变Cu-Fe-S体系。与其它类似矿床相比,该矿床硫化物中以富Zn、贫金为特征。综上认为该矿床为斑岩-高硫型浅成低温热液Cu-(Au)套合成矿的典型实例,其勘查突破为羌塘南缘火山岩区及覆盖区的找矿打开了一扇窗口。 相似文献
7.
斑岩体的存在是斑岩型铜矿重要的特征，查明隐伏斑岩体对于斑岩铜矿找矿预测有着重要的意义。文章以多宝山矿集区的岩石标本物性特征为基础，对重力、磁法、广域电磁法资料进行了处理和分析，根据矿化蚀变中心一般位于斑岩体顶部和矿化蚀变具有电阻率显著降低的特征，从已知到未知，对多宝山铜矿、铜山铜矿和争光金矿的隐伏花岗闪长斑岩体进行了识别，进而推断出矿体位置。根据电性异常特征推测：多宝山铜矿可以扩大外围找矿部署，铜山铜矿矿体有往下延伸的趋势，隐伏斑岩体南侧可能存在大型矿体；争光金矿深部可能存在斑岩型铜矿。多宝山铜矿、铜山铜矿、争光金矿同属斑岩型铜矿系统，多宝山矿集区具“上金下铜”的成矿特征。钻孔揭示了铜山矿区隐伏斑岩体南侧矿体的存在，新增资源量达到大型矿床规模。证实了方法的有效性，同时也显示出矿集区矿产资源潜力巨大。 相似文献
8.
西藏驱龙铜矿区及其外围找矿前景地球化学评价 总被引：1，自引：0，他引：1
西藏驱龙斑岩铜矿床的发现是近年我国地勘行业找铜工作的重大突破之一。在发现找矿线索、确定成矿类型和评价找矿前景的过程中,勘查地球化学起了举足轻重的作用。1∶20万区域化探异常圈定了Cu-Mo矿化的范围,异常追踪查证工作确定了Cu-Mo矿化类型和找矿的有利地段。通过测区系统的地球化学勘查工作,结合地质构造资料,认为驱龙地区存在典型的斑岩铜矿床地球化学异常模式,矿化体剥蚀程度很浅,是找寻以斑岩型Cu-Mo矿化为主的超大型铜钼矿床的良好远景区。 相似文献
9.
本文在安徽马头斑岩型钼铜矿床中元素含量随主成矿元素Mo含量变化的基础上,对元素的富集贫化特征进行了系统研究,筛选出了富集和贫化元素,并对具有代表性的富集和贫化元素的矿化指示意义进行了探讨。结果发现,矿床中元素的富集和贫化在地表岩石中均有明显反映,综合利用富集元素的正异常和贫化元素的负异常能更有效指示出矿化带的产出位置,这无疑对此类隐伏矿床的地球化学勘查具有重要意义,也为其他类型矿床的地球化学勘查提供了思路。 相似文献
10.
依据澜沧铅矿2004～2010《全国危机矿山接替资源找矿勘查工作》项目所获,结合以往勘探采矿和科研成果,在原提出“上铅、下铜”金属分带规律的基础上,根据铜矿体下部有矽卡岩化和花岗斑岩脉以及上部铅矿石矿物中有辉钼矿、钨、锡矿化等异常现象,推断深部可能存在钼、锡、钨等的矿化类型(第三矿化带).据此提出“层脉结合,远、近结合,拆墙扩储”的12字找矿新思路,调整工作部署、优选找矿靶区(位),终于在深部发现厚大斑岩型钼(铜)矿体,证实了预测.认为澜沧老厂矿床“三元矿化结构”,实质上是一个完整的斑岩成矿系列,成矿时代为燕山晚期—喜马拉雅早期(始新统晚期为主),矿床成因为与隐伏岩体有关的中偏高温热液矿床. 相似文献
11.
Inter-regional correlation of transgressions and regressions in the Cretaceous period 总被引：1，自引：0，他引：1
T. Matsumoto 《Cretaceous Research》1980,1(4):359-373
Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous. 相似文献
12.
The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism. 相似文献
13.
K.Naganjaneyulu 《地学前缘(英文版)》2014,5(1):1-2
正The Precambrian shields and associated suture zones of the globe preserve important records of continental growth and destruction,the formation and closure of ocean basins,and the early evolution of the Earth in terms of tectonics,resources,and environment.They also offer critical clues on the nature and style 相似文献
14.
Daniel Harlov 《地学前缘(英文版)》2014,5(5):621-625
正1.Introduction This special issue of Geoscience Frontiers is a tribute volume honoring the life and career of Jacques Touret.A set of research papers has been assembled,which broadly reflect his research interests over his 50 plus year career.These papers focus on the role that fluids play during the formation and evolution of the Earth's crust.Below I provide a brief summary of the life of Jacques Touret,along with a select bibliography of his more important papers.This is then followed by a brief introduction to the papers assembled for this special issue. 相似文献
15.
《地学前缘(英文版)》2014,(1):139-141
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 and mantle dynamics,global tectonics,economic geology and fuel exploration,geophysics,stratigraphy and paleontology with new 相似文献
16.
正The world petroleum exploration suggests that,about70%of the world’s potash resources were discovered during oil and gas exploration(Zheng et al.,2007).The Kuqa depression in the Tarim basin is abundant with petroleum exploration data,and 相似文献
17.
正Qarhan Salt Lake is located in the eastern part of the Qaidam Basin,which is first discovered the large potash deposit in the late 1950s.The Bieletan section is located in the west of Qarhan Salt Lake,where saline sediment 相似文献
18.
正With the approach of the 45th World Earth Day,China’s Ministry of Land and Resources issued the status of the Chinese geological survey and environments on 22nd April 2013.Regional geological survey in 2013 achieved new results—(why was oceanic in twice?)polar and oceanic expedition were fully completed,a national census of geography was begun,and 相似文献
19.
正1 Introduction The Lop Nor playa,located in the eastern end of the Tarim Basin,capped with a thick salt crust covering an area of approximately 5,500 km2(Ma 2007)that closely resembles a"Great Ear"in satellite images.Understanding the formation of the salt crust can provide important 相似文献
20.
In Liaoning, Hunan, Guangxi, Guizhou, Gansu, Sichuan, Anhui, Jilin and other provinces in China, there is a wide occurrence of metal quantity over 1000 tons of refractory gold ores, principally because of low gold recoveries and become ＂stay mine＂. Features of refi＇actory gold ores are： gold in micro-particles or a microscopic state that is wrapped in pyrite, presence of arsenopyrite and other sulfide minerals or disseminated in the crystal lattice of sulfide minerals; harmful impurity elements such as arsenic, carbon, mercury, antimony, copper with high content are closely related with the gold, and these elements affect the contact reaction between the gold and solvent extraction, making the recovery of the gold extraction process low. In the past 20 years, overseas countries have developed the application of the roasting oxidation method, hot acid （alkali） oxidation, bacterial oxidation and flash chlorination oxidation technology to solve this problem.Among these, biological oxidation has developed rapidly in the domestic market and gold enterprises abroad because of its low investment in infrastructure, low production costs, less environmental pollution, simple process and easy control, etc. 相似文献