共查询到20条相似文献，搜索用时 156 毫秒
1.
文章通过对东准噶尔蒙西矿床蚀变、矿化和元素分带特征的研究,厘定了蚀变类型及其时空分布规律,探讨了两期矿化蚀变所对应的斑岩体,初步建立了矿床成矿模型。结果显示蒙西斑岩铜矿区蚀变与成矿具双系统叠加结构:地表和浅部的钾化和铜钼矿化与花岗斑岩密切共生。矿区大面积绢英岩化-黄铁矿化-青磐岩化、深部发育的钾化磁铁矿化,及从上往下的Ag、Pb-Zn与Au垂向分带的矿化与深部发育的闪长玢岩有关。地表和浅部花岗斑岩及其伴生的钾化、铜钼矿化是花岗斑岩铜钼矿化蚀变系统的根部与残留,而闪长玢岩成矿系统以铜金矿化为特征。基于新建立的成矿模型与已有的勘探成果,推测深部存在隐伏的Cu-Au矿体。 相似文献
2.
哈日扎矿床是东昆仑成矿带东段地区近年来发现的一处大型铜、铅、锌、银复合矿床,为研究该矿床矿化蚀变规律,在总结成矿地质背景和VI矿带矿床地质的基础上,探讨斑岩-热液成矿特征,分析深部找矿远景。研究表明,NW向断层控制的构造破碎带及岩石节理、裂隙是矿区主要储矿构造,热液脉型银多金属矿体由浅及深含矿脉逐渐变宽大,矿体呈似层状、脉状、透镜状,类型主要以银、铅、锌矿石为主。脉状矿底部出现青磐岩化-泥化-硅化蚀变分带,并出现黄铜矿,具斑岩型-浅成低温热液脉型成矿系列。利用广域电磁法测量在脉状矿深部1 200～1400 m呈“囊”状低阻体,因此,深部寻找斑岩铜矿潜力巨大。 相似文献
3.
冬瓜山铜矿床是铜陵矿集区狮子山矿田中的主要矿床,对于该矿床中斑岩型成矿作用的研究缺乏。本文对冬瓜山矿床深部是否存在斑岩型矿体、斑岩型矿化特征及其与层状矽卡岩型矿化的关系等问题开展研究。冬瓜山矿床深部具有斑岩型矿化的蚀变类型和蚀变分带特征,矿化可分为钾硅酸盐阶段和石英硫化物阶段两个成矿阶段,斑岩型蚀变分带在空间上向外与矽卡岩化带过渡。斑岩型矿化的石英闪长岩形成年龄为140 Ma,与上部层状矽卡岩型矿化相关的石英/辉石二长闪长岩应为同期闪长质岩浆形成。深部斑岩型矿化的成矿流体具有由高温向中温演化的特点,与浅部层状矽卡岩型矿化的成矿流体具有相似的演化趋势,二者的成矿流体应该为一个热液系统,深部岩体内部流体演化形成斑岩型矿化,而接触带部位流体演化形成矽卡岩型矿化。 相似文献
4.
胶东栖霞香夼铅锌多金属矿床地质特征及成因 总被引：3，自引：0，他引：3
胶东栖霞香夼铅锌多金属矿床是目前山东省内发现的规模较大的铅锌矿床.通过对该矿床的地质背景、矿体和矿石特征、围岩蚀变特征、矿床成因等进行了综合研究分析,认为该矿床的火山活动存在着中性-中酸性-酸性的演化规律,其成矿系统有明显的垂直分带现象:浅部为铅锌矿体,中部为铜硫矿体,深部为铜钼矿化,不同类型矿体是在不同阶段形成的,与不同类型岩浆作用有关.蚀变作用及蚀变岩发育广泛,既具有"面型"蚀变特征,又表现出一定的分带性,矿区热液作用的阶段性非常明显,铅锌矿床成矿流体的盐度值是很高,成因为斑岩型铅锌矿床. 相似文献
5.
6.
云南中甸红牛铜矿床位于三叠纪义敦岛弧南端的中甸弧,是云南三江地区新探明的铜矿床之一,目前探明铜金属资源量已达中型以上规模。本文通过详细的矿体特征、蚀变分带、矿化分带以及元素地球化学特征等方面的研究,认为红牛矿床围岩蚀变及矿化分带在垂向和水平方向都具有典型的矽卡岩型矿床特征,矽卡岩元素地球化学特征明显受大理岩、石英二长斑岩化学组成的影响,矿床为典型的矽卡岩型矿床,推断深部的斑岩体可能有巨大成矿潜力。 相似文献
7.
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
8.
【研究目的】黄沙坪铜锡多金属矿床是湘南地区岩浆热液成矿系统的典型矿床之一。为了深化研究该矿床成岩成矿机制、高效指导深部找矿勘查,需要揭示与隐伏花岗斑岩有关的多金属矿化-蚀变分带规律,构建深部矿化-蚀变空间分带模式。【研究方法】应用热液矿床的大比例尺蚀变岩相定位找矿预测方法,开展矿区内-136 m、-176 m、-256 m中段典型穿脉剖面的矿化蚀变测量和矿物岩石地球化学研究,剖析了矿化-蚀变的强弱变化、矿物共生组合及其空间分带特征,探讨了成矿元素、元素组合及其元素比值变化规律。【研究结果】构建了矿化-蚀变空间分带模式：从花岗斑岩体（内带）→接触带→围岩（外带）,依次为钨钼（黄铁）矿化-硅化-绢云母化花岗斑岩带（Ⅰ）→磁铁（钨锡）矿化石榴石矽卡岩带（Ⅱ-1）→钨钼-磁黄铁矿化石榴石矽卡岩带（Ⅱ-2）→铅锌矿化结晶灰岩带（Ⅲ）→强方解石化灰岩带（Ⅳ）的分带规律,各带对应的主要矿物组合为：石英+（黄铁矿+绢云母）→磁铁矿+透辉石+硅灰石+绿帘石+绿泥石+（白钨矿+锡石+黄铁矿+石榴石）→白钨矿+辉钼矿+磁黄铁矿+（锡石+黄铜矿+黄铁矿+闪锌矿+方铅矿）+石榴石+符山石+透辉石+角闪石+萤石+... 相似文献
9.
乌兰乌珠尔铜矿床处于柴达木陆块西南缘、祁漫塔格山北坡-夏日哈新元古代-早古生代岩浆弧带西段,属祁漫塔格-都兰华力西期铁、钴、铜、铅、锌、锡、硅灰石（锑、铋）成矿带,是青海省内矽卡岩型铁多金属矿的主要成矿带,成矿地质条件优越。乌兰乌珠尔铜矿床的发现为该地区寻找类似的斑岩型铜矿床提供了一个实例。本文通过对乌兰乌珠尔铜矿区地质特征、地球物理及地球化学异常特征、硫氧同位素特征、蚀变类型、分带特征及其与矿化之间的关系等方面的分析研究认为矿床形成与破碎蚀变带中的斑岩脉有关,矿体围岩具有典型的斑岩型矿床蚀变分带特征,蚀变主要有钾化、绢英岩化和青磐岩化3种类型,铜矿化主要分布于绢英岩化蚀变岩中,而铜矿体则全部集中在强绢英岩化岩石中,总结了铜矿床的地质特征,并对其成因类型和找矿前景进行了分析。 相似文献
10.
内蒙古维拉斯托-拜仁达坝斑岩-热液脉状成矿体系研究 总被引：11，自引：0，他引：11
维拉斯托锡-钨-铷矿床是内蒙古克什克腾北部区新发现的一处大型斑岩型锡-钨-铷多金属矿床。矿床主要产出于锡林浩特杂岩和石炭纪石英闪长岩中,与石英斑岩体的侵位具有成因联系。该斑岩型矿床与之前发现的维拉斯托和拜仁达坝脉状矿床组成了一个由高温向中低温逐渐演化、过渡的斑岩-热液脉状锡-钨-铷-铜-锌-铅-银成矿体系。该成矿体系中成矿作用主要由四个阶段组成,即：(1)早期钠-钙-锶蚀变阶段锡-钨-铷矿化,(2)中期云英岩化阶段锡-钨矿化,(3)后期硅化、绢英岩化阶段铜-锌-铅-银矿化,以及(4)晚期无矿化阶段。钠-钙-锶蚀变阶段蚀变矿物主要为钠长石和天河石,伴随浸染状锡石、铁闪锌矿和黑钨矿化,含少量的毒砂和砷铋矿;云英岩化蚀变矿物主要为石英和棕色白云母,含少量的萤石,以锡石、黝铜矿和黑钨矿化为主,含少量的毒砂、黄铁矿、黄铜矿、铁闪锌矿、辉钼矿等;硅化-绢云母化蚀变矿物主要由石英、绿色绢云母、萤石组成,晚期蚀变叠加了明显的高岭土化、伊利石化和绿泥石化,该阶段形成大量的块状硫化物,以黄铁矿、毒砂、磁黄铁矿、铁闪锌矿、黄铜矿、方铅矿和含银黝铜矿为主。成矿体系内金属矿物组合和蚀变矿物组合显示成矿热液具有低氧逸度、低硫逸度和偏酸性的特征。成矿体系具有明显的蚀变分带和元素分带。蚀变分带主要体现为深部石英斑岩体中的钠-钙-锶蚀变带,近岩体的云英岩化蚀变带,以及远离岩体的硅化、绢云母化蚀变带。元素分带主要体现为近源（岩体）为锡-钨-铷矿化,铜、锌、铅和银矿化则依次向外产出。从元素分带的特征显示成矿物质从持续向外流动的热液中顺序卸载可能是这种分带性形成的根本原因,这种分带特征也是成矿热液运移方向的直接指示。该成矿体系内强烈富集大离子亲石元素,显示岩浆阶段的分异是成矿物质积聚的原因。元素的分带特征显示,热液阶段的分异则是成矿物质卸载的原因。维拉斯托斑岩型锡-钨-铷多金属矿床的发现为该地区大量脉状铅-锌-银矿床指出了新的找矿方向。 相似文献
11.
东濮凹陷北部沙三中亚段广泛发育盐岩和烃源岩,这两个看似不能共存的物质却在这里互层共生。该时期研究区沉积特征为多盐韵律与多层烃源岩互层共生、连续沉积,单个盐韵律厚度从几米到十几米,烃源岩有机质丰度高、类型好。平面上,两者在湖盆沉积沉降中心共生;垂向上,高有机质丰度、好干酪根类型与高盐度地层具有较好的对应关系。因而成为恢复古气候和古环境的重要研究对象。通过岩石学、古生物学以及Sr/Ba、B/Ga、(V+Ni+Mn)、Fe/Mn、Sr/Cu、Mg/Ca、V/(V+Ni)、稀土元素含量和氯同位素等方法对凹陷北部沙三中亚段的沉积环境进行研究。结果表明,凹陷北部沙三中亚段为深水沉积的还原环境,古盐度较高,达到半咸水-咸水沉积;微量元素和孢粉化石特征表明研究区沙三中亚段为温暖潮湿的环境。 相似文献
12.
The Importance of the Precipitation and the Susceptibility of the Slopes for the Triggering of Landslides Along the Roads 总被引：3，自引：1，他引：2
Clemente Irigaray Francisco Lamas Rachid El Hamdouni Tomás Fernández José Chacón 《Natural Hazards》2000,21(1):65-81
In order to characterise the influence of the heavyrains on the observed landslides during the 1996–1997hydrological cycle, rainfall records for the last 100years are analysed from 104 stations in easternAndalusia. Regarding the amounts of rain recordedbetween October 1996 and March 1997 in the 104stations studied, 31 presented new all-time records;15 presented values that were 80–100% of thepre-1995 record; 49 stations, 80–50%; and 9stations, < 50%. A map has been devised of thesusceptibility of the materials through which thesouth-eastern Andalusian road network crosses,together with an inventory of the damage caused byinstability phenomena on banks and cuttings of theroad network during the winter of 1996–1997. Therelationships between the rainfall during the studyperiod, the damage caused to the road network and thesusceptibility of the materials affected are analysed.The results indicate that there is a clearcorrespondence between the rainfall recorded and thesusceptibility of the materials with the inventorieddamage. It is concluded that the widespread seriousdamage caused in early 1997 to the roads andsurrounding areas in the Alpujarra region and thecoast of the Province of Granada was mainly caused bythe extraordinarily heavy rains. However, considerablyless damage was observed where the susceptibility ofthe terrain is low, thus highlighting the extremeusefulness of terrain-susceptibility maps for riskprevention and territorial planning. 相似文献
13.
郯庐断裂南段研究进展与断裂性质讨论 总被引：13，自引：3，他引：13
据1：5万区域地质调查和专题研究资料，就郯庐断裂带是否南延与消失的原因，其与大别—苏鲁造山带交截形成的假位错效应，以及与中新生代沉积盆地形成演化的关系等作了新的阐述。在此基础上，讨论了郯庐断裂带是否为巨大的左行平移断层或转换断层。认为郯庐断裂带可能是在“古郯庐带”的基础上于早侏罗世重新活动、白垩纪强烈活动的地堑型枢纽断裂带。 相似文献
14.
15.
Guboglo M. N. 《GeoJournal》1980,4(1):53-58
International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen. 相似文献
16.
某高速公路下伏煤矿采空区稳定性分析 总被引：10，自引：0，他引：10
在论述某高速公路下伏砦脖煤矿采空区地质、采矿和工程地质特征的基础上, 进行了稳定性数值模拟分析, 定性与定量地分析与评价了该煤矿采空区的地表变形特征及稳定性。研究结果表明: 该煤矿采空区的变形尚未完成, 对拟建的高速公路将产生很大的危害, 必须采取相应的工程治理措施。 相似文献
17.
Jiayu Rong Michael Melchin S. Henry Williams Tatyana N. Koren Jacques Verniers 《《幕》》2008,31(3):315-318
The Global Stratotype Section and Point （GSSP） for the base of the Silurian System was defined in 1985. Since that time, a number of researchers have suggested that this section has serious deficiencies for use as a GSSP. As a result, in 2000, the Subcommission on Silurian Stratigraphy （SSS） proposed undertaking a formal restu@ of this GSSP, which was subsequently approved by the International Commission of Stratigraphy （ICS）. The result of this restudy was the formal proposal that the current GSSP, at 1.6 m above the base of the Birkhill Shale, at Dob＇s Linn, Scotland, should be maintained as the same locality and stratigraphic level, but the bios- tratigraphical definition of the boundary should be revised. The previously defined, basal Silurian grapto- lite zone, the Parakidograptus acuminatus Zone, should be subdivided into a lower Akidograptus ascensus Zone and a higher E acuminatus Zone. The base of the A. ascensus Zone, marked by the first appearance of A. ascensus, should be regarded as the biostratigraphic mark for the base of the Silurian. This proposal has now been formally approved by the SSS and ICS, and ratified by International Union of Geological Sciences. This is the first GSSP to undergo formal restudy and redefini- tion, and the proposal also included a recommended procedure for restudy of GSSPs. 相似文献
18.
Dean S. Oliver 《Mathematical Geology》1998,30(7):911-933
In reservoir characterization, the covariance is often used to describe the spatial correlation and variation in rock properties or the uncertainty in rock properties. The inverse of the covariance, on the other hand, is seldom discussed in geostatistics. In this paper, I show that the inverse is required for simulation and estimation of Gaussian random fields, and that it can be identified with the differential operator in regularized inverse theory. Unfortunately, because the covariance matrix for parameters in reservoir models can be extremely large, calculation of the inverse can be a problem. In this paper, I discuss four methods of calculating the inverse of the covariance, two of which are analytical, and two of which are purely numerical. By taking advantage of the assumed stationarity of the covariance, none of the methods require inversion of the full covariance matrix. 相似文献
19.
Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth
B. P. Kondratyev 《Astronomy Reports》2017,61(8):709-714
It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T 3 = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″. 相似文献
20.