共查询到20条相似文献，搜索用时 187 毫秒
1.
新疆香山铜镍硫化物矿床浅富矿体特征 总被引：12，自引：0，他引：12
本文通过对香山铜镍硫化物矿床中浅富矿体产出的地质条件和基本特征、矿石组构特征、成矿元素的赋存规律，以及矿石同位素组成特征和意义的研究，为在整个铜镍成矿带中寻找浅富矿体提供了对比和找矿依据，同时对深部矿体的开发和利用有着重要的实际意义。 相似文献
2.
本文讨论了新疆西准噶尔地区地幔岩团块的岩石类型及其结构与组构特征,并研究了不同组构特征的岩石所代表的地质环境及其与深大断裂的关系,同时还初步分析了它们的应力条件。这些研究将有助于揭示地幔岩的演化及其与地球驱动力的关系,并为进一步探讨板块构造、蛇绿岩及其与有关矿产的关系,提供一些微观数据。 相似文献
3.
4.
黔西晚二叠世煤地球化学性质变异及特殊组构的火山灰成因 总被引：18，自引：2，他引：18
运用仪器中子活化分析(INAA)、电感耦合等离子体原子发射光谱(ICP—AES)、X射线衍射(XRD)、带能谱仪的扫描电镜(SEM—EDX)及光学显微镜等手段，对黔西晚二叠世煤地球化学性质变异及其特殊组构的火山灰成因进行了研究。结果表明，贵州西部织金矿区9煤层中异常高含量的Fe(4．24％)、Cu(369．90μg／g)、U(49．6μg／g)、Mo(63．10μg／g)、Zn(33．97μg／g)等是来源于同沉积基性火山灰降落到泥炭沼泽中所致；高含量的Fe、Cu并非以通常意义的煤中硫化物状态存在；除煤中有机质和陆源碎屑外，发现了由火山灰、有机质和陆源碎屑所形成的煤层中的特殊组构，暂定名为沉碳质火山胶凝物，它是一种有机—无机高度混合物质，根据沉碳质火山胶凝物的形态特征和物质组成，厘定出6种组构类型，分别是：网状组构、细屑组构、基质组构、孔腔组构、均质组构和碎屑组构。 相似文献
5.
6.
黔西南,桂北地区微细浸染型金矿床砷,锑,汞,铊元素及矿物组合特征 总被引：3，自引：0，他引：3
本文结合野外地质调查和有关的低温硫化物相平衡实验结果，对黔西南、桂北地区的浅成低温热液浸染型金矿床与金共生的硫化物矿物组合、地球化学特征及其成矿作用机制进行了综合分析研究。研究表明，与金矿化共生的砷、锑、汞和铊等地球化学指示元素及其矿物组合不仅具有成生方面的联系，而且可以作为寻找金的一种特征的标型标志。 相似文献
7.
粤东嵩溪银锑矿床成矿构造及矿化富集规律浅析 总被引：2，自引：1，他引：2
论述了嵩溪银锑矿床的地质特征、矿脉形态特征及组构特征，通过分析得出矿床成矿断裂的产生有四个阶段，其中银、锑矿化主要与第二、三阶段有关。 相似文献
8.
砂土的力学响应具有显著的增量非线性特征，这与离散颗粒的微观结构，即组构特性密不可分。采用应变响应包络可以较好地获得材料在不同加载方向上的增量力学响应。在物理试验中无法同时获得同一试样在不同加载方向下的宏、微观响应，故采用离散元方法，对具有不同应力历史、不同应力状态和不同级配的试样在Rendulic平面上的增量力学响应进行了系统研究和分析。离散元模拟结果表明，传统的塑性理论不能很好地描述具有复杂应力历史试样的增量力学响应，而基于颗粒间接触法向的组构增量与剪应变之间在多种不同的工况条件下均具有较强的线性相关性。当砂土的相对密实度相同时，该线性系数主要与围压的大小有关，对颗粒级配、应力历史以及应力比的变化均不敏感。由于组构的大小可以较好地量化砂土的内结构各向异性程度，进而表征应力历史的作用。上述模拟结果为在本构建模中引入组构演化机制，综合反映外荷载和内结构各向异性对砂土增量本构关系的影响提供了较好的微观物理依据。 相似文献
9.
矿石组构特征(构造结构特征)是在一定的成矿地质条件和物理化学条件下形成的,它是造矿矿物形成过程的客观证据.研究它可以帮助分析成矿地质条件和物理化学条件的特点,从而提供有关矿床成因方面的信息,同时也可以给地质普查和勘探工作及选择最佳的矿石技术加工方法和选矿流程等提供基础资料.因此,矿石组构的研究很早以来就成为矿床地质研究的重要内容. 近年来我们研究了一些金属矿床的矿石组构特征,并纵观国内外金属矿石组构特点的研究现状,深感必须重视以下六个方面的问题. 一、矿石组构的研究应与成矿地质条件的研究相结合 相似文献
10.
金在硫化物矿物中呈负价态存在及其形成机理初探李九玲，冯大明，亓锋，张桂兰（地矿部矿床地质研究所，北京１０００３７）关键词金，硫化物，金的负价态，实验地球化学金与硫化物的密切共生关系是明显的，特别是与黄铁矿、毒砂、辉锑矿等。但是在大多数类型金矿床中都是... 相似文献
11.
支建铝土矿位于三门峡—新安铝土矿成矿带。通过对支建铝土矿的结构要素及成因、构造特征、沉积层序、主要组分变化与埋深、沉积环境、迁移和沉积方式的研究,初步建立了该区铝土矿的沉积模式,指出进一步的找矿方向,即在古陆周围深部煤系地层之下,仍能形成具工业意义的铝土矿体,这对河南省铝土矿找矿工作和煤矿的资源转型有一定的借鉴意义。 相似文献
12.
《Ore Geology Reviews》2003,22(1-2):91-116
Sediment-hosted disseminated gold deposits in NW Sichuan China have many features in common with the well-known Carlin-type deposits in the western United States. They are hosted by Middle–Upper Triassic turbidites composed of 1300–4300 m of rhythmically interbedded, slightly metamorphosed calcareous sandstone, siltstone, and slate. The ore bodies are typically layer- or lens-like in shape and generally extend parallel to the stratification of the host sedimentary rocks, with a strike length of tens to several hundreds of meters. The immediate host rocks consist mainly of calcareous slate and siltstone characterized by high contents of organic matter and diagenetic pyrite. The main primary ore minerals associated with gold mineralization include pyrite, arsenopyrite, realgar, and stibnite. Gangue minerals comprise mostly quartz, calcite and dolomite. Gold is extremely fine-grained, usually less than 1 μm, and cannot be seen with an electron microscope.Two types of ore mineralization have been recognized in the deposits. The stratiform ores are composed of rhythmical interbeds of sulfides (e.g., pyrite, arsenopyrite, realgar, stibnite) interpreted to be authigenic and detrital quartz, quartzite, sericite, and graphite of allogenic origin. They were folded and deformed concordantly with host rocks, and grade both vertically and laterally into normal country rocks. Another type of ore forms a network of numerous gold-bearing veins and veinlets of quartz–calcite–sulfides of millimeter-, centimeter-, decimeter-, and even meter-scale in width. The network ore randomly fills fissures, microfissures, and cleavages, but still is stratabound in character. Detailed studies on ore fabrics show abundant evidence for synsedimentary origins, although subsequent diagenesis, metamorphism, tectonic deformation, and epigenetic hydrothermal activity have significantly remolded the primary fabrics. Primary fabrics are shown either by rhythmical interbeds of different mineral components parallel to the bedding, or by the change of grain size of the same minerals such as pyrite, realgar, and stibnite. The layer inhomogeneity of the stratiform ore is clarified by parallel overprints of later schistosity planes, resulting in distinct grain orientation and elongation, aggregate polarization, and undulating extinction of ore minerals, especially of mechanically and chemically extremely mobile ones, such as realgar and stibnite.It is proposed that the stratiform ores in these Chinese deposits were most probably formed concurrently with their host Middle–Upper Triassic turbidites in submarine, hot spring environments, while the network mineralization was formed as a result of complicated processes such as diagenesis, weak metamorphism, tectonic deformation, and epigenetic hydrothermal activity, responsible for the remobilization or reworking of the pre-existing stratiform ores. Geochemical data also support this genetic model. 相似文献
13.
The Neoarchaean Epoch nickel sulphide (NiS) deposit, discovered in 1970 and subsequently mined from 1972 to 1998, has been previously interpreted to be a magmatic ore system. However, on the basis of field, petrographic and analytical data obtained during the initial exploration and evaluation stages, integrated with limited new analytical data (SEM and ore microscopy), we propose that the Epoch NiS may be of hydrothermal origin. Key features that have prompted a re-appraisal of the genesis of the Epoch mineralisation, include: a) ore lenses are irregularly distributed along foliation fabrics of the host talc-carbonate rocks and as such no relationship to basal ultramafic/mafic units; b) the thickness of the ore lenses are highly variable from tens of centimetres to several metres; c) ore mineralogy is characterised by dominant millerite–pyrite–chalcopyrite assemblages; and d) high Pd/Pt ratios. Although our hydrothermal model is somewhat speculative, we suggest that on present evidence there is little doubt that the Epoch NiS lacks the features of typical magmatic sulphide deposits. More geochemical and isotopic data are needed to test our model. 相似文献
14.
岩矿显微组构对水银洞金矿成因的指示 总被引：1，自引：0，他引：1
黔西南水银洞金矿为产于上二叠统龙潭组中的超大型、高品位金矿床,矿床由多个金矿体组成.工业金矿体顺层产于龙潭组含煤地层所夹的玄武质、硅质、生物碎屑碳酸盐岩中.对水银洞金矿赋矿地层岩石以及矿石显微组构进行了研究,矿石中主要载金矿物为细粒黄铁矿,具再生边、粒内孔隙、铸模孔隙结构及镶边生物矿化构造、铸模式生物矿化构造,是一典型的具沉积一成岩组构.金矿化与硅化有密切的成因联系,金与SiO2来源于峨嵋山玄武岩的喷溢活动,主要金矿体更多显示与峨嵋山玄武岩准同生特征.矿床为沉积一成岩弱改造成囚金矿床. 相似文献
15.
含熔体差应力状态下中下地壳岩石的变形结构与物质迁移 总被引：1，自引：0，他引：1
通过对辉长岩、麻粒岩、斜长角闪岩高温高压变形实验样品的研究,确立了含熔体差应力状态下中下地壳岩石共轭扇式变形模型的合理性,划分出垂直于轴向压应力定向和剪切定向两种变形组构。并通过对主要变形矿物、变形组构的识别,详细勾画了辉长岩、麻粒岩、斜长角闪岩3种典型中下地壳岩石的变形结构图式和变形机制。辉长岩为弥散带状变形结构,麻粒岩、斜长角闪岩为共轭扇式模型结构;中下地壳岩石的变形可能主要集中在流变性最强的一种或者几种组分上;变形集中化的过程,也往往是某些组分集中化的过程;变形不仅是造成岩石圈深部层次物化环境不均一性的重要因素,也是成矿的重要条件。 相似文献
16.
17.
18.
易门式大型铜矿床构造成矿动力学模型 总被引：5，自引：1，他引：5
针对金属矿床隐伏矿定位预测的关键问题,在提出构造成矿动力学的分支学术方向的基础上,以易门式大型铜矿床为例,从成矿地质背景、矿田构造、构造地球化学和成矿构造应力场等方面进行构造成矿动力学研究,阐述在构造应力场控制下成矿流体运移和聚集的规律。构造地球化学研究认为,构造地球化学异常反映矿体的原生晕;构造地球化学异常受构造控制,其分带特征可指示成矿流体的流向,并提供矿床成因和隐伏矿(化)体相对埋深的信息。构造应力场的控矿特征主要表现在:构造应力场导致控矿构造的形成,并驱动成矿流体的运移;构造应力场控制了成矿能量场;应力和能量的高值集中区分布特点可反映某些构造型式。在此基础上建立构造成矿动力学模型,概括隐伏矿成矿预测准则,据此提出若干重点找矿靶区和靶位,其中部分靶区得到工程验证,表明构造成矿动力学方法对隐伏矿定位预测和评价具有重要的指导意义。 相似文献
19.
Hydrothermal sedimentation characteristics of the Dajiangping superlarge pyrite deposit, Yunfu, Guangdong 总被引：1，自引：1，他引：0
The Dajiangping pyrite deposit is hosted in a carbonate-clastic rock series which is characterized by a bioreef-chert suite in its middle part.Conformable lenses of various sizes constitute the orebodies which often branch transitionally into the surroundings.Syngenetic deformation fabrics can be observed in orebody NO.3.Orebody No.4 is composed almost entirely of massive pyrite,with conspicuous hydrothermal sedimentation and bacterium-alga features.The hydrothermal sedimentation origin is also reflected by simple chemistry of the ore (predominated by quartz and pyrite),the presence of U and Th,and the REE compositions of pyrite and ankerite.The ores are rich in organic matter and the difference in organic content between the banded ores and the massive ores is mainly owing to the difference in the clastic components they contain rather than to the subsequent processes of reworking .Co/Ni rations in the ore may reflect the temperature pattern during hydrothermal sedimentation. 相似文献