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滇东南锡多金属矿产区域分布规律 总被引：1，自引：0，他引：1
滇东南锡多金属矿产围绕花岗岩成矿中心在某一或某几个特定的象限内作带状分布,各个成矿中心在区域上等间距出现,成岩成矿主要在燕山期,与早期岩体有关的矿产主要伴生金,与晚期岩体有关的矿产主要伴生银,不同成分的花岗岩有不同的矿产分布形式. 相似文献
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煤系中广泛存在与煤炭成因具有紧密联系的多种矿产,按照其特性和用途可分为煤系能源矿产、煤系金属矿产、煤系非金属矿产,其中一些矿产的经济价值甚至远远超过煤炭资源本身。但由于种种因素制约,长期以来忽视了对煤系矿产的综合评价和勘查,造成了资源的巨大浪费。通过对煤系矿产资源概念的厘定、煤系矿产赋存特征及资源分布特征的分析,提出了煤系矿产资源研究及勘查开发方向,为我国煤系矿产资源的综合勘查开发提供基础理论指导。 相似文献
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当前在矿产资源分布方面一个值得重视的事实是,世界多数矿产的大部分储量都集中在数量有限的大型矿床和特大型矿床中,而且世界矿产的大部分产量也主要采自这些矿床.如1979年资本主义世界主要金属开采 相似文献
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本文主要叙述了陕西省矿产资源，包括金属、非金属、能源矿产的分布情况，以及在全国矿产资源中所处的重要地位。 相似文献
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栾川县位于豫西多金属成矿带中心,特殊的地理位置和成矿条件造就了栾川丰富的矿产资源。目前,栾川境内已发现金属矿产、非金属矿产、能源矿产和水汽矿产4大类、50余种,其中钼金属储量222万吨,居亚洲第一、世界第三,2006年3月荣膺“中国钼都”称号。 相似文献
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本文在根据云南重力资料编制地壳基性度等值图的基础上划分了该区的地壳类型,进而探讨了铀和金属矿产组合、分布规律及其与地壳类型间的密切关系。最后作者提出了铀和金属成矿系列具有同源性和地壳类型具有成矿专属性的看法。 相似文献
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越南社会主义共和国矿产资源及其地质特征 总被引：1，自引：0，他引：1
越南社会主义共和国的矿产资源种类较全,分布相对集中,自1945年后经过数十年不懈努力,不论在金属矿产、非金属矿产及能源矿产方面都取得了成就,成为东南亚国家中矿产资源比较丰富的国家之一.近十几年来越南政府采取更加开放的政策,吸引外资,合作勘查与开发,使矿产地质工作走上了一条崭新道路. 相似文献
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非金属矿产是在自然界分布最广泛的矿产资源,它同金属和能源矿产一起构成发展国民经济的三大类矿物原料之一,而非金属矿产的特点则是除了化工原料利用其化学元素外,则以利用矿物、岩石的物理、化学性能为其重要特征,与人们的日常生活较金属矿产更为直接和密切,它在世界上的总消耗量超过能源也大于金属矿产.因此,非金属矿业已经成为某些国家重要的经济支柱.随着社会生产力的发和科技进步非金属矿产种类和用途在不断扩大.许多非金属矿产,由 相似文献
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《西北地质》2001,34(3)
《中国周边国家毗邻地区火山岩和金属矿产》是根据原地矿部部控86150项目预定的任务,由南京地质矿产研究所情报室和西安地质矿产研究所情报室合作完成的情报研究成果.本书分东部分册和西部分册,总计约50万字.所述主要内容是中国东部周边国家毗邻地区的火山岩与金属矿产.本书系统地研究了中国周边国家毗邻地区火山岩与之有关的金属矿产的地质特征、成矿条件、矿床成因类型和分布规律等,并作了必要的对比讨论,对有关方面了解我国周边国家与火山活动有关的金属矿产分布规律研究程度,部署地质勘查工作具有重要实用意义.由西安地图出版社出版,每套200元.现仍有少量存书,愿购买者请与《西北地质》 编辑部联系. 相似文献
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基于多期次流体活动在硬玉岩及后成合晶冠状体的交互作用过程中发挥了至关重要的作用,采用电子探针、显微红外光谱等测试方法,从微尺度角度重点对缅甸角闪石质硬玉岩中角闪石+铬硬玉+硬玉后成合晶冠状体的成分和结构羟基赋存状态进行了研究。结果显示,参与后成合晶冠状体形成的流体组分较为复杂且形成过程是多阶段的;后成合晶冠状体的共生矿物组合不同,角闪石质硬玉岩中普遍发育角闪石+铬硬玉+硬玉化学成分环带;后成合晶冠状体中核部角闪石结构羟基含量较为均一,铬硬玉边缘至硬玉、硬玉晶粒中的结构羟基含量呈较为规律的递增趋势。核部角闪石中结构羟基均一且外层硬玉中结构羟基含量的变化规律表明缅甸硬玉岩中后成合晶冠状体的形成环境相对稳定,主要以多期次流体交代为主,未出现较大规模的动力变质作用。缅甸硬玉岩中后成合晶冠状体成分及水含量的变化规律有助于解析该地区俯冲带流体参与硬玉岩交互作用的轨迹,从而为缅甸硬玉岩的成岩机制提供一定的佐证。 相似文献
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以危地马拉蓝水料与缅甸油青种翡翠为研究对象,通过显微镜观察、岩石薄片观察、X射线粉末衍射分析、激光拉曼光谱分析、扫描电镜分析、电子探针分析等测试手段对两者进行了常规宝石学特征、结构特征、杂质矿物、化学成分等方面的对比研究。结果表明,危地马拉蓝水料发育等粒变晶结构,主要成分为硬玉,含有绿辉石,硬玉环带以2～3层为主,绿辉石分别以自形颗粒、交代残余、沿微裂隙充填3种形式存在,其中白色点状物为钠长石,绿色点状物为霓辉石和绿辉石的混杂物;缅甸油青种翡翠以硬玉为主颗粒相对粗大,呈柱粒状镶嵌结构,硬玉发育3～5层环带结构,绿辉石以脉状充填硬玉颗粒间隙或被硬玉颗粒交代呈孤岛状。危地马拉蓝水料硬玉颗粒与脉状绿辉石的CaO含量均高于缅甸油青种翡翠,另外由于霓辉石的存在,推测两产地翡翠结晶环境中的Ca、Fe含量可能存在差异。 相似文献
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Myanmar is perhaps one of the world's most prospective but least explored minerals jurisdictions, containing important known deposits of tin, tungsten, copper, gold, zinc, lead, nickel, silver, jade and gemstones. A scarcity of recent geological mapping available in published form, coupled with an unfavourable political climate, has resulted in the fact that, although characterized by several world-class deposits, the nation's mineral resource sector is underdeveloped. As well as representing a potential new search space for a range of commodities, many of Myanmar's known existing mineral deposits remain highly prospective. Myanmar lies at a crucial geologic juncture, immediately south of the Eastern Himalayan Syntaxis, however it remains geologically enigmatic. Its Mesozoic-Recent geological history is dominated by several orogenic events representing the closing of the Tethys Ocean. We present new zircon U-Pb age data related to several styles of mineralization within Myanmar. We outline a tectonic model for Myanmar from the Late Cretaceous onwards, and document nine major mineralization styles representing a range of commodities found within the country. We propose a metallogenetic model that places the genesis of many of these metallotects within the framework of the subduction and suturing of Neo-Tethys and the subsequent Himalayan Orogeny. Temporal overlap of favourable conditions for the formation of particular deposit types during orogenic progression permits the genesis of differing metallotects during the same orogenic event. We suggest the evolution of these favourable conditions and resulting genesis of much of Myanmar's mineral deposits, represents a single, evolving, mineral system: the subduction and suturing of Neo-Tethys. 相似文献
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硬玉岩是一种较为少见的高压低温变质岩,不仅具有重要的科研价值,也是一种名贵的玉石材料。本文对产于哈萨克斯坦卡拉干达州伊特穆伦矿区的硬玉岩进行了岩相学观察和矿物化学成分分析,并与缅甸、俄罗斯和危地马拉的硬玉岩进行对比。结果表明,哈萨克斯坦硬玉岩主要组成矿物为硬玉、绿辉石以及少量方沸石和钠沸石,具有粒柱状变晶结构,硬玉矿物的平均化学成分为w(SiO2)=58.38%,w(Al2O3)=21.88%,w(Na2O)=12.69%,w(CaO)=3.40%,w(MgO)=2.58%,w(FeO)=0.29%。不同产地样品中绿辉石和硬玉的SiO2含量相差不大。哈萨克斯坦样品中绿辉石Na2O和FeO的含量略低于缅甸、俄罗斯和危地马拉,MgO和CaO稍高于其它3个产地,硬玉MgO和CaO略高于其它3个产地。 相似文献
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Observed summer (May–October) rainfall in Myanmar for the period 1981–2010 was used to investigate the interannual variability of summer monsoon rainfall over Myanmar. Empirical orthogonal function, the sequential Mann-Kendall test, power spectrum analysis, and singular value decomposition (SVD) were deployed in the study. Results from spectral analysis showed that the variability of rainfall over Myanmar exhibits a 2- to 6-year cycle. An abrupt change in rainfall over the country was noted in 1992. There was a notable increasing rainfall trend from 1989. After the sudden change, the mean rainfall increased by 36.1 mm, compared with the mean rainfall before the sudden change, and was associated with a rise in temperature of about 0.2 °C. An increase in heavy rainfall days was observed from the early 1990s to 2010. IOD and ENSO play an important role in the interannual variability of the summer rainfall over Myanmar. The covariability between rainfall over Myanmar and Indian Ocean SST generally suggests that a positive IOD mode is associated with suppressed rainfall in the central and northern parts of Myanmar. During a negative IOD mode, nearly the whole Myanmar experiences enhanced rainfall, which is associated with devastating socioeconomic impacts. The covariability between the rainfall over Myanmar and the sea surface temperature in the Pacific Ocean in the first and second SVD modes was dominated by warming in the east and central Pacific—an El Niño-like pattern—resulting in dry conditions in central Myanmar. 相似文献
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危地马拉目前已成为仅次于缅甸的第二大翡翠原料供应地。这两个产地翡翠辨别的需求愈发迫切,且应用意义较大。采用显微镜观察、电子探针分析及背散射电子照相获得危地马拉蓝水料翡翠的矿物成分及结构构造特征,结合两产地翡翠产出的大地构造环境、自然地理环境、原石特征与矿物成分特征等进行对比分析。总体上,危地马拉翡翠次生原石有一定的磨圆,呈次棱角状,“皮”(风化皮)厚度较薄,较少出现翻砂现象,由“皮”向里,极少甚至几乎不存在“红雾”。相对地,缅甸翡翠次生原石发育显著的球状风化,原石通常有较好的磨圆度,棱角状不明显,“皮”厚度可达数厘米,用手压磨有显著的翻砂现象, “皮”“肉”之间偶可见“红雾”。硬玉与绿辉石成分判别图显示危地马拉翡翠中硬玉和绿辉石呈相对富Ca、贫Na的特征,而缅甸翡翠中硬玉和绿辉石整体呈相对贫Ca、富Na的特征。在Fe含量上,危地马拉翡翠中硬玉的Fe含量较缅甸翡翠中硬玉的Fe含量偏低,而危地马拉翡翠中绿辉石的Fe含量较缅甸翡翠中绿辉石的Fe含量偏高。对翡翠外观特征的充分对比和对判别图的综合分析可应用于实际中翡翠产地的区分。 相似文献
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缅甸中央盆地北部新生代隆升作用的研究,不仅对全面认识西缅地块的演化具有重要的意义,而且对该地区的油气勘探也具有重要的指导意义.对采自研究区的2个碎屑岩样、1个钻井基底样品进行了磷灰石裂变径迹测年及热历史模拟分析.在弧前钦敦坳陷西缘冲断带、东缘冲起带和西缅岛弧带获得了逐渐变年轻的裂变径迹年龄（分别是70.6±9.3 Ma、53.4±7.5 Ma和22.7±3.0 Ma）,表明缅甸中央盆地北部在空间上存在自西向东的递进变形过程.磷灰石的热历史模拟分析显示,缅甸中央盆地北部自晚白垩世（80±1 Ma）开始,经历了隆升→快速隆升→平稳→缓慢隆升4个阶段.缅甸中央盆地29~20 Ma的快速隆升冷却事件是缅甸北部区域性隆升剥露作用的体现;4 Ma以来缅甸中央盆地缓慢隆升,这一构造事件是印度板块向东挤压碰撞作用的响应.研究表明缅甸中央沉积盆地的空间发育演化与递进式构造变形（隆升）是新特提斯洋/印度洋岩石圈在新生代期间向西缅地块下的多期次俯冲的直接响应. 相似文献
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Knowledge of Trans-Himalayan tectono-magmatic evolution is critical to understanding the complex pre-collisional history of southern Eurasia active continental margin. It has been proposed that magmatic rocks of the Trans-Himalayan batholith, extending from southern Tibet to Southeast Asia, are now exposed as the Western Myanmar Arc and Central Granite Belt in Myanmar, yet origin, emplacement, and relationships of the two juxtaposed belts remain poorly constrained. In this study, 2D seismic and drilling data for the Western Myanmar Arc, zircon U-Pb age and Hf isotope and whole-rock geochemical data for magmatic rocks from the arc have been applied. Our seismic profiles, borehole stratigraphic sequences and zircon U-Pb data show that a typical arc-basin system was well developed along the western Myanmar continental margin. The magmatic arc has experienced at least three igneous events in the mid-Cretaceous (110–90 Ma), latest Cretaceous-Early Paleocene (69–64.5 Ma) and Eocene (53–38 Ma), as well as three associated uplift processes in the Late Cretaceous, Eocene and Late Oligocene. Whole-rock geochemical characteristics and zircons showing variable but predominately positive εHf(t) values, suggest a significant juvenile mantle source involving a proportion of ancient subducted sediments and juvenile crustal materials for these typical arc-related magmatic rocks. The identification of mid-Cretaceous to Paleogene magmatic rocks having positive εHf(t) values from the Western Myanmar Arc: 1) indicates that the magmatism can be correlated with the Gangdese arc within the Lhasa terrane of the southern Tibetan Plateau; 2) provides evidence for the proximal-derived model that Paleogene sediments in the Central Myanmar Basin were from the Western Myanmar Arc, but were not delivered by the paleo-Yarlung Tsangpo-Irrawaddy river system from the Gangdese arc; and 3) enables a model of eastward subduction of the Neo-Tethyan/Indian oceanic crust to reflect onset of the magmatism at the mid-Cretaceous and a long-existed back-arc extension in western Myanmar. 相似文献
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Two of the major granite belts of Southeast Asia are the Main Range and Eastern Province. Together, these are interpreted to represent the magmatic expression of the closure of Palaeo-Tethys during Late Palaeozoic to Early Mesozoic times. Recent geochronological and geochemical work has better delineated these belts within Peninsular Malaysia, thereby providing important constraints on the timing of Palaeo-Tethys suturing. However, the northern extension of this Palaeo-Tethyan suture is less well understood. Here we present new ion microprobe U–Pb zircon age data from northern Thailand and eastern Myanmar. Measured ages of 219 and 220 Ma from the Kyaing Tong granite imply northern extension of the Main Range Province into eastern Myanmar. The Tachileik granite in far eastern Myanmar yields an age of 266 Ma, consistent with published Eastern Province ages, and this therefore constrains the northern extension of the Palaeo-Tethys suture in eastern Myanmar. We further discuss how this suture may extend northwards into Yunnan. A Late Cretaceous age (70 Ma) measured in Thailand represents later magmatic activity, and is similar to published magmatic ages from central Myanmar. This younger magmatism is interpreted to be related to the subduction of Neo-Tethys prior to India–Asia collision. Further, we present new laser ablation zircon Hf isotope data from eastern Myanmar which suggest that Palaeoproterozoic crust underlies both the Main Range and Eastern Province granites. Our εHf model age of ca. 1750 Ma from Sibumasu, the basement underlying eastern Myanmar, lies within the range of other model ages reported thus far for the Baoshan Block north in Yunnan, interpreted by some to be the northern extension of Sibumasu. 相似文献