共查询到20条相似文献，搜索用时 62 毫秒
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随着地质找矿难度的日益加大,如何科学地圈定找矿靶区,已成为新时期矿产勘查部署及实现找矿突破的关键。成矿单元划分是区域成矿规律研究的基础性工作,在圈定找矿靶区、部署矿产勘查工作中起着重要作用。目前国内成矿单元划分的主要方法是以区域内成矿作用最强、矿床最多的构造旋回所形成的地质构造单元为基础,同时考虑其它构造旋回形成的矿床分布状况而进行成矿单元划分,即采用综合方法划分成矿单元（陈毓川等,2007.徐志刚等,2008.）。对于仅发育单一构造演化阶段或多数矿床形成于某一主要构造阶段的区域而言,上述划分思路和方案基本反映了成矿地质背景及矿产分布规律。但对于发育多个构造演化阶段或多旋回造山带的区域（如陕西省）而言,其矿产众多且形成于多个构造演化阶段,综合方法所划分的成矿区带则较难客观、清晰地反映其成矿背景及矿产分布规律。陕西省多年来的矿产勘查实践表明,成矿单元的划分应从本省多旋回构造演化、多阶段成矿作用的实际出发开展断代成矿单元划分,从而清晰地反映各构造演化阶段的成矿特征及矿床分布规律,以满足新时期地质找矿工作的需求。 相似文献
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长江中下游地区硫铁矿成矿规律及前景探讨 总被引：1，自引：0，他引：1
长江中下游地区是我国重要的硫铁矿产地之一 ,已探明的 47个矿床主要集中分布在宁芜、庐枞、铜陵、宁镇等 7个成矿区内。主要矿床可划分为 4种成矿类型 ,即陆相火山型、夕卡岩型、斑岩型及热液型。通过对硫铁矿成矿地质条件分析认为 ,陆相火山型、夕卡岩型硫铁矿床成矿规模大、分布集中 ,为今后找矿的主攻类型。在铜陵、宁芜、庐枞 3个成矿区可分别圈定出找矿有利地段。 相似文献
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云南东川昆阳古裂谷型铜矿的成矿模式与找矿方向 总被引：4，自引：0，他引：4
从东川铜矿区域地质背景、成矿环境、富集规律和控矿因素的角度入手,对东川昆阳古裂谷演变的整个过程作了简要的说明.形成和建立了一整套东川矿区铜矿的成矿模式和找矿模式;确定了东川铜矿区以寻找稀矿山式、东川式、桃园式和滥泥坪式铜矿为主要目标.同时根据东川矿区各类型铜矿的分布特点,预测了东川铜矿区新一轮找矿的方向及靶区位置,为东川铜矿区的找矿工作提供科学合理的理论依据. 相似文献
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中国铀矿资源特征及成矿规律概要 总被引：15，自引：0，他引：15
铀资源是我国重要的战略资源和能源矿产,作为26个重要矿种之一完成了全国铀矿资源潜力评价。在项目开展过程中,通过对中国铀矿资源特征、铀矿床类型(成因类型和预测类型)、时空分布及成矿系列研究,总结了中国铀矿的成矿规律。本文梳理了中国铀资源勘查现状与最近铀矿勘查工作进展,建立了4大类9类21亚类铀矿床类型,划分了50个铀矿预测类型;总结了中国铀矿时空分布特征及铀成矿规律,进而划分了29个铀成矿区带和20个铀成矿远景区带,建立了20个铀~多金属成矿系列。上述研究成果与进展有利于综合分析区域铀成矿规律,以期为未来的铀矿找矿工作提供指导。 相似文献
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《International Geology Review》2012,54(11):2020-2026
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《International Geology Review》2012,54(9):1137-1146
Highly mineralized, largely sodium-chloride type, brines in deep artesian basins are similar in composition to the mineralized abyssal hydrothermal waters of present day volcanic regions as well as the material impounded in liquid inclusions of minerals. It is also well established that present brines are very similar to hydrothermal ore-forming solutions. Some highly concentrated brines can be explained by derivation from salt basins but there is no adequate explanation for the worldwide distribution of concentrated brines. Exchange reactions merely change composition, not concentration. Some hydrocarbons found in minerals as well as in brines have originated from CO2, H2O, and H2 liberated from volcanoes and magma chambers. The abyssal brines may be the product of magmatogenic hydrothermal activity or the brines themselves may be the source of ore-forming hydrothermal solutions. If the latter is true, there is still no explanation of the high mineralization of brines. Many brines are deafly similar to sea water but the salts in sea water are largely produced by volcanic activity. It is suggested that many of the brines are formed in deep unexposed parts of artesian basins from highly concentrated hydrothermal solutions migrating from magmatic chambers. --J. A. Redden. 相似文献
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《International Geology Review》2012,54(8):727-742
Magnetotelluric (MT) measurements at six locations along a 90-km profile across the area between Gölpazari and Akcaova have been modeled in two dimensions to increase understanding of the deep conductivity structure of the western part of the North Anatolian fault zone (NAFZ) and the Istanbul and Sakarya zones. It is well known from surface geology that the branch of the NAFZ that passes through the Pamukova Valley with an E-W strike separates the region into two sub-areas, containing contrasting sets of geological features. These two areas also exhibit significant differences in terms of their deep conductivity structure. Electrical resistivity is quite low (10 ohmm) south of the fault at an approximate depth of 26 km, compared to the area north of the fault zone. This low-resistivity zone may provide an indication of partial melting at this depth. In the northern part of the profile beneath Ücgaziler (DUC) and Akcaova (DAK), a five-layered conductivity sequence obtained by magnetotelluric modeling and the magnetotelluric model has been examined in light of the surface geology. It is concluded that layers in the conductivity model may correspond to fragments of the Istanbul zone and the Sakarya continent, as well as the ophiolitic slab in between. 相似文献
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太阳风中磁流体湍流的特征和本质 总被引：1，自引：0，他引：1
在空间探测的早期,太阳风湍流现象就已经被空间飞船的观测发现了。但是太阳风湍流不同于过去学术界熟悉的流体湍流。虽然国际学术界已进行了长期的研究,但太阳风湍流的本质仍不能得到明确的认识,许多观测现象都得不到解释。涂传诒等［1～5］研究了这些现象,促进了理论上的新进展。这些研究指出,太阳风起伏中存在着非线性湍流相互作用,但不是完全发展的湍流,而是正处于由阿尔芬波向着完全发展的湍流过渡的状态。这一新的概念把阿尔芬波传播理论与磁流体湍流理论结合起来,导致了理论上的新进展,从而揭示了太阳风湍流的本质,阐明了一系列过去不能解释的观测现象。着重介绍了这些研究的成果和意义。 相似文献
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THE NATURE AND ORIGIN OF BED-FORM HIERARCHIES 总被引：3，自引：0，他引：3
J. R. L. ALLEN 《Sedimentology》1968,10(3):161-182
The bed forms generated by liquid flows over loose-grain boundaries assume only two orientations relative to flow, being either transverse or longitudinal, but range enormously in physical scale. Two types of bed form, current ripples and parting lineations, take a characteristic length (2) which is independent of boundary conditions as expressed by flow depth (d). We have that: λL≤ 0.025 m (parting lineations) λR≤ 0.60 m (ripples). The characteristic length of other kinds of bed form is correlated with flow depth, according to the equations: λD= 1.16D1.1.55 (dunes) λA 6.3d (antidunes, Fr = 1.0) λSR= 1.35d1.31 (sand ribbons) λM - 672d1.11 (meander bars) λT= 116d2 (tidal current ridges) From these relationships can be deduced the compositions of theoretical hierarchies of bed forms, where a hierarchy is defined as a series of bed forms graded as to size which in combination are adapted to a single overall flow condition. The compositions of these hierarchies, which are closely matched by naturally occurring hierarchies, are broadly related to available flow depth, general flow conditions (lower or upper regime), and availability of sediment. Bed forms are considered to be due to unstable interactions between the bed material and the over-bed flow, of liquid or grains or both. Hierarchies of bed forms arise because the quantities determining the flow are suficiently numerous that several mutually unstable combinations can exist, each combination being expressed in terms of a bed form of a characteristic physical scale and orientation relative to flow. 相似文献
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前言右江盆地是指海西—印支期由师宗—弥勒断裂、红河断裂、紫云—南丹—河池断裂和灵山断裂所围限的滇黔桂地区。长期以来,由于该盆地所处的特殊构造背景、独特的岩相-构造格局和丰富的矿产资源,许多地质工作者都予以充分注意,对该盆地的性质提出了众多有益的观点和认识,除传统的槽、台、洼学说外,先后有“弧间盆地或弧后盆地”、“湘桂边缘海”、“弧后裂谷地槽”、“右江裂谷带”和“裂陷槽”等等。笔者参考了这些前人的工作成果,并据自己的研究,参与这一讨论,亦望同行指正。一、右江沉积盆地的性质笔者认为,右江海西—印支期沉积盆地应主要归属于古特提斯构造域,具有被动型裂谷盆地的沉积、构造、成矿与岩浆活动特点。 1.古特提斯于泥盆纪初沿金沙江-红河断裂带开裂。我国著名地质学家王鸿祯教授将扬子地台以西、松潘、甘孜三角地带以及巴颜喀拉地带称为古特提斯,并认为从泥盆—石炭纪 相似文献
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自然控制与人类社会的可持续发展 总被引：3，自引：0，他引：3
以如何实现人类社会可持续发展为主题,论述了“控制自然与自然控制”与实现可持续发展的关系;论述了学科交叉点的锐意创新与实现自然控制的关系。以及对在这一研究过程中,应注重发挥哪些学科、领域的优势和大胆开拓创新的交叉学科领域等提出了一些看法。并强调制定区域社会、经济发展战略规划,必须以区域资源、环境状况为基础。 相似文献
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天然金刚石的红外光谱特征及其分类 总被引：2，自引：0，他引：2
通过对南非,辽宁,山东等不同产地及不同颜色的金刚石样品进行红外光谱测试,分析了它们的红外光谱特征并对样品进行了分类,进一步指出了样品的红外光谱特征与其晶体结构,物理化学性质之间的关系,并对金刚石样品进行了质量评价。 相似文献