共查询到20条相似文献，搜索用时 31 毫秒
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正Three-dimensional geological modeling(3DGM) assists geologists to quantitatively study in three-dimensional(3D) space structures that define temporal and spatial relationships between geological objects.The 3D property model can also be used to infer or deduce causes of geological objects.3DGM technology provides technical support for extraction of diverse geoscience information,3D modeling,and quantitative calculation of mineral resources.Based on metallogenic concepts and an ore deposit model, 3DGM technology is applied to analyze geological characteristics of the Tongshan Cu deposit in order to define a metallogenic model and develop a virtual borehole technology;a BP neural network and a 3D interpolation technique were combined to integrate multiple geoscience information in a 3D environment. The results indicate:(1) on basis of the concept of magmatic-hydrothermal Cu polymetallic mineralization and a porphyry Cu deposit model,a spatial relational database of multiple geoscience information for mineralization in the study area(geology,geophysics,geochemistry,borehole,and cross-section data) was established,and 3D metallogenic geological objects including mineralization stratum,granodiorite, alteration rock,and magnetic anomaly were constructed;(2) on basis of the 3D ore deposit model,23,800 effective surveys from 94 boreholes and 21 sections were applied to establish 3D orebody models with a kriging interpolation method;(3) combined 23,800 surveys involving 21 sections,using VC++ and OpenGL platform,virtual borehole and virtual section with BP network,and an improved inverse distance interpolation(IDW) method were used to predict and delineate mineralization potential targets (Cu-grade of cell not less than 0.1%);(4) comparison of 3D ore bodies,metallogenic geological objects of mineralization,and potential targets of mineralization models in the study area,delineated the 3D spatial and temporal relationship and causal processes among the ore bodies,alteration rock,metallogenic stratum,intrusive rock,and the Tongshan Fault.This study provides important technical support and a scientific basis for assessment of the Tongshan Cu deposit and surrounding exploration and mineral resources. 相似文献
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全国重要矿产预测评价 总被引：2，自引：0，他引：2
全国重要矿产预测评价在借鉴国内外矿产预测经验基础上,运用成矿系列理论、成矿动力学理论和综合信息矿产定量预测理论为支撑的矿床模型综合地质信息矿产预测方法,以成矿系列矿产预测类型为纲,在系统编制建造构造预测底图的基础上,建立矿床综合信息预测模型。通过运用成矿地质体参数法,在矿产资源评价系统(MRAS)的辅助下,估算我国铁、铝、铜、铅、锌、金、锑、钨、锰、锡、钼、镍、银、稀土、铬铁矿、菱镁矿、锂、硼、硫、萤石、钾、重晶石、磷23种矿产地下2 km预测资源量,并在此基础上圈定全国层次的3级预测区。科学评价了我国矿产资源的潜力,为国家政府机构和矿产勘查机构提供技术支撑。 相似文献
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The Zhuxi deposit is the largest copper-tungsten polymetallic deposit in the world and is in Jiangxi Province in South China. The ore body is characterized by hydrothermal-vein deposits of copper, lead, and zinc minerals at shallow levels, skarn deposits of tungsten and copper minerals at middle levels, and altered-granite-hosted copper and tungsten minerals at depth. Such metallogenic systems are typically intrusion-related. The intrusive granites related to the Zhuxi polymetallic deposit have been dated at 152.9 Ma to 146.9 Ma. The intrusions provided the thermal energy and the source material for the ore mineralization. Skarns mineralization, the main type of ore mineralization, developed in the contact zone of Carboniferous-Permian formations with the granites. Nappe structures changed the dip of the ore bodies from steep in the top part to gentle in the bottom. NE-trending faults provided the fluid pathways and controlled the geological framework and distribution of ore deposits on a regional scale. In this study, recognition exploration criteria were analyzed based on a mineral deposit model and the geological setting. Extraction of favorable geological information and GIS-based data-integration methods were used for mineral-prospectivity mapping of Zhuxi-type polymetallic deposits. Buffering analysis was employed to extract structural information (e.g. faults) and lithologic or stratigraphic information (e.g. granites or geologic units). The singularity method and spatially weighted principal component analysis were used to enhance and delineate geochemical anomalies. The derivative norm was utilized to extract magnetic-gradient anomalies associated with intrusive granites. Student t-test of weights-of-evidence (WofE) proved to be an effective way to optimize threshold values for binarization of variables as evidence layers by evaluating the spatial correlation between known deposits and geological variables. The posterior probabilities of WofE gave a relative estimation of mineralization potential. Areas delineated by high posterior probability had much higher potentiality for the discovery of new deposits where had none had been found yet. 相似文献
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利用遥感技术提取找矿信息主要是提取地质构造信息、特殊岩性段(包括矿化蚀变段)信息等。以湖南省秀才洞热液型铀矿区的钻孔岩心HySpex成像光谱数据为例提取矿化蚀变信息,建立了一种以成像光谱数据处理为基础的矿物信息识别流程,识别出高岭石、蒙脱石、伊利石、方解石、白云母5种蚀变矿物。通过研究岩心中蚀变矿物的类型、组合及其分布规律,总结出研究区的矿化蚀变岩心以伊利石和蒙脱石为主,并伴有高岭石化,推断研究区的赋矿围岩花岗岩发生了酸性交代并产生了泥岩化蚀变现象,而且研究区的构造演化较复杂,岩浆具有多期次、多阶段侵入的特点,蒙脱石比高岭石蚀变强烈反映出成矿环境主要以碱性环境为主。 相似文献
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广东省仁化县书楼丘铀矿床三维地质建模及成矿预测 总被引：1，自引：0，他引：1
综合地质、地球化学等资料进行多元信息成矿预测是目前深部固体矿产主要工作方法。广东仁化县书楼丘铀矿床位于诸广南铀矿田北部,是诸广南铀矿田重要的组成之一。本次为了拓宽书楼丘矿床深部找矿思路,探讨其找矿潜力,在前人研究和勘探基础上,总结了矿床综合信息找矿模型,以三维定量预测研究理论基础,根据矿床成矿条件和找矿标志特征,提取地质、化探、钻探资料的成矿有利信息,并利用COCAD软件构建了地形-地表、岩体、构造、矿体等地质模型,对信息进行综合成矿有利分析,运用信息量法进行研究区深部矿产资源预测,共圈定了3片靶区。 相似文献
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Conventional methods for the estimation of mineral resources potential are broadly subdivided into two groups: subjective models based upon ore genetic theories and objective models based upon multiple geological observations. This paper examines some objective means that brings the two types of model together and jointly utilizes the information from both ore genesis and geological observations in delineation of promising areas for mineral exploration. These promising areas are here referred to as intrinsic geological units. They are so-called because they are not identified directly with respect to mineral deposits, but delineated in terms of some critical genetic factor, a necessary condition for formation of the mineral deposits. Four major steps are involved in this analysis. First, establish the structure of critical genetic factor-recognition criteria-multiple geodata for the deposit type of interest. Next, estimate probabilities of occurrence of each of the recognition criteria based upon geological observations. Third, a synthesized probability measure for occurrence of critical genetic factor is determined as an optimum linear combination of the probabilities estimated in the second stage. Finally, intrinsic geological units are delineated by optimally discretizing the probability measure for the critical genetic factor. This estimation procedure is formulated into a three-stage optimization model: logistic regression-quadratic programming-optimum discretization, which is demonstrated with a case study on epithermal Au-Ag mineral deposits in the Walker Lake quadrangle of California and Nevada. In this case study, heat source is selected as the critical genetic factor and it is identified by three selected recognition criteria: Au-Ag mineral occurrence, Tertiary intrusive, and hydrothermal alteration. The intrinsic geological units for epithermal Au-Ag deposits are delineated on the basis of six different preprocessed and integrated geological, geochemical, and geophysical fields. 相似文献
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卷积神经网络在图像识别领域处于领先地位,在目标检测方面的应用也越来越广泛,其特点是可以提取点与点之间的相关关系。二维地质图中,点与点之间往往存在特定的空间关系,将卷积神经网络技术应用于地质异常信息的提取有其重要性。在讨论卷积神经网络以及基于该技术目标检测算法(YOLO)的基础上,以湖南香花岭地区为例,提取与锡矿成矿相关的构造信息并进行分析,结果该方法能够覆盖原有矿点,有效地定义点与点之间的相关关系,描述点与点之间的空间相关性,可靠地提取与成矿有关的构造线密度信息,在花岗岩体与构造复杂地区圈出地质异常信息。 相似文献
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1:5万矿产地质调查中通常会优先部署地球化学调查工作,采样密度一般大于8点/km2,并分析多达38项地球化学指标,其主要目的是发现"矿致异常",指导矿产勘查工作.而研究表明,区域地球化学数据是地表物质化学组成的直接反映,所以不仅包含了与成矿有关的异常信息,更包含了丰富的地质信息.在本次工作中应用中国西北干旱荒漠景观区1:5万地球化学调查数据成功识别了工作区地质体单元的分布.相比1:20万地质底图,通过clr-PCA分析提取出的1:5万地球化学数据信息展现了更多的细节:（1）地质体单元可以更为细致地划分为多个次级单元;（2）侵入体单元可以进行期次或岩相划分;（3）可为地质体单元的归属提供依据.本项研究结果成功指导了后续开展的1:5万地质调查工作,并对最终的1:5万地质图进行了验证,此外还提供了多处有利找矿线索. 相似文献
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金矿是班公湖-怒江成矿带的优势矿种之一。由于地质工作程度总体较低,金矿的成矿规律和成矿作用研究相对薄弱,严重制约了金矿的评价。本文在前人已有研究成果的基础上,通过大量的野外地质调查与综合研究成果,初步论述了班公湖-怒江成矿带金的成矿地质背景、金矿床的主要成因类型、时空分布特征和成矿作用。研究结果表明,班公湖-怒江成矿带金矿床(点)在空间分布上具有东西成带,相对集中的分布特征。金主要以共生、伴生的形式存在。矿床类型有矽卡岩型、斑岩型、造山型和浅成低温热液型等4类,其成矿时代集中于晚侏罗世—晚白垩世。依据矿床成因及成矿作用主控因素,可将班公湖-怒江成矿带金矿床归纳为与洋壳俯冲消减作用有关的岩浆热液金成矿系统和与大陆碰撞造山作用有关的金成矿系统。与洋壳俯冲消减作用有关的岩浆热液金成矿系统可进一步划分出浅成低温热液型金矿床、斑岩型铜金矿床、矽卡岩型金铜矿床等3种成因类型;而与大陆碰撞造山作用有关的金成矿系统包括浅成低温热液型铜金矿床、造山型金矿床、矽卡岩型金铜矿床等3种成因类型。 相似文献
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超大型矿床是某一(或某些)矿种资源的巨大储库。据统计,全球矿产资源70%~85%的勘探储量集中分布于占全球矿床数10%的超大型矿床。由此可见发现超大型矿床对一个国家经济与社会发展的极端重要性。超大型矿床成矿背景是其形成的基础,成矿过程是其成矿的关键,勘查评价是其发现的根本途径。文章试图从成矿背景、成矿过程与勘查评价相互关联的角度探索超大型矿床“三位一体”的找矿理念。对于隐伏的和新类型超大型矿床,集“成矿背景、过程与勘查评价”于一体的找矿理念是矿产勘查成功的关键。我们根据地球成矿动力学理论,将地壳结构复杂的地质异常区域(如板块边界)定义为找矿可行地段;在找矿可行地段内,根据成矿系统理论,将成矿关键要素(源、运、储、盖)发育的地段定义为找矿有利地段;在找矿有利地段内,根据成矿系列理论,将可能出现矿床共生组合的地段定义为找矿远景地段。根据自组织成矿系统理论,一个矿集区内,矿床规模-频率幂律分布,奠定了多尺度聚焦找矿的理论基础。地质矿化单一信息的多解性和不确定性奠定应用综合致矿信息找矿的理论基础。基于成矿系统和综合致矿信息数字找矿模型的矿产勘查是从成矿的因果关系(本质)和矿床与诸控矿因素的相关关系(现象)两个方面确定可能矿化地段的最有效方法。超大型矿床找寻上升至综合地学学科水平,应视为一种科学的探索,这种探索综合来自地学各相关领域致矿信息,然后将从这些信息中获取的关键成矿过程和参数转换为找矿的空间数据信息,根据选靶模型识别并确认这些空间数据信息的存在,最后在全球、成矿省和矿化集中区尺度上圈定能够定量排序的超大型矿床的找矿远景区(靶区)。集“成矿背景、过程与勘查评价”于一体的找矿理念应为未来的超大型矿床勘查奠定理论和方法学基础,为应用直接探测技术和方法探测矿床提供合理的工程勘查方案。 相似文献
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本文以正在开展公益性基础地质矿产调查项目的西藏洛扎地区为例,选取SPOT-6、ETM+数据,开展遥感地质解译;选取ASTER数据开展遥感蚀变异常提取;通过1∶5万水系沉积物测量,开展地球化学异常提取;结合已有地质资料等信息,提取该地区成矿影响因子。采用层次分析法对各影响因子进行综合分析,计算出各因子的权重值。利用GIS平台,建立了层次分析评判的综合信息成矿预测模型,圈定了6个成矿远景区,通过野外调查发现了铜铅矿化,为该地区地质矿产调查工作提供了技术支持。 相似文献
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成矿信息的提取是矿产预测的重要手段,其方法的有效性直接影响到预测成果的可靠性。在成矿规律研究的基础上,有意识地干预模型的构成,突出与成矿有关的信息;抑制某些成矿意义不明显和属干扰的信息,有目的地使模型向反映成矿信息的方向逼近,提高模型与矿床实际赋存地质环境的吻合程度,均是成矿信息提取和强化的内涵。本文从研究实践中总结了先验约束模型和非先验约束模型的强化方法,在新疆阿勒泰地区的地质－找矿工作中已取得 相似文献
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The Gejiu (个旧) deposit is a superlarge tin-copper polymetallic ore-forming concentration area characterized by excellent metallogenic geological settings and advantageous ore-controlling factors. The deposit displays diverse mineralization properties due to different minerals and mineral deposit types. Based on the principal metallogenic factors, metallogenic mechanisms, mineralized components, and occurrence of mineral deposits or ore bodies, the Gejiu mineral district can be divided into 2 combinations of metallogenic series, 4 metallogenic series, 8 subseries, and 27 mineral deposit types. Spatial zonality is evident. The distribution regularity of the elements in both plane and section is Be-W, Sn (Cu, Mo, Bi, Be)-Sn, Pb, Ag-Pb, Zn around a granitic intrusion. The metallogenic epoch is mainly concentrated in the late Yanshanian. During this period, large-scale metallogenic processes related to movement caused by tectonics and magmatism occurred, and a series of magmatic hydrothermal deposits formed. The ore-forming processes can be divided into 4 stages: the silicate stage, the oxide stage, the sulphide stage, and the carbonate stage. Based on the orderliness and diversity (in terms of time, space, and genesis) of the mineralization, the authors have developed a comprehensive spectrum of ore deposits in the Gejiu area. This newly proposed diversity of mineralization and the spectrum developed in this work are useful not only for interpreting the genesis of the Gejiu deposit but also for improving mineral exploration in the area, and in particular, for finding large deposits. 相似文献
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长江中下游成矿带的探明资源已开采殆尽,深部找矿（-500--2000m）应是当务之急。根据勘查与开采资料的综合研究,该区的控矿条件可概括为：岩石圈减薄事件是成矿作用的重要前提,燕山期强烈的构造-岩浆活动是区域成矿的主要关键,地表断裂构造样式是深部构造的响应,前陆盆地沉积建造是成矿作用的优越围岩条件,铁、铜矿床的岩浆岩蚀变特点明显不同,埃达克质岩可视为找铜矿床的间接标志。对于今后深部找矿提出4个思路：①火山岩盆地下部的深部找矿思路;②目标地层的深部找矿思路;③复合类型矿床的深部找矿思路;④接触带“多台阶”的深部找矿思路。 相似文献
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王欣 《物探化探计算技术》2007,29(4):349-352
数据驱动的证据权法被用来进行金矿潜力制作。为了确定秦岭~松潘金矿的潜力区,需利用地质、地球化学、地球物理等数据。数据采集、图形处理、空间分析都是在GIS平台上进行的。预测结果表明,证据权法在综合不同空间数据上是有效的,最终的预测图件圈出了最有利的矿化区,可用于进一步勘查研究。 相似文献
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在大数据蓬勃发展的时代背景下,矿产资源定量预测作为地质大数据的核心部分,其综合分析挖掘多元信息的基本思路与大数据的理念不谋而合。以四川拉拉铜矿为例,开展基于机器学习的三维矿产资源定量预测。通过建立三维地质模型,提取成矿有利信息,构建研究区定量预测模型;基于"立方块预测模型"找矿方法,采用机器学习随机森林算法,计算出研究区成矿概率分布,以此圈定出5个找矿远景区。结果表明,随机森林具有更高的预测准确度与稳定性,且能够对控矿要素重要性做出定量评价。该研究成功地将机器学习应用于三维矿产定量预测,为今后的矿产资源预测评价做出了积极的探索。 相似文献
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青海沱沱河多才玛特大型Pb-Zn矿床——定位预测方法与找矿突破过程 总被引：6，自引：0，他引：6
青海南部沱沱河地区的多才玛矿床是最近找矿突破发现的一个特大型铅锌矿床.由于赋矿规律不清,找矿方向不明,勘查曾一度陷入困境.针对制约找矿突破的关键地质问题,笔者开展了成矿潜力、矿床赋存规律、矿体定位预测研究,经钻探验证,实现了找矿突破.通过区域对比,认为沱沱河地区与“三江”带内兰坪等其他地区的地质背景相似,具有发育大型沉积岩容矿贱金属矿床的潜力;发现区域发育大型逆冲构造和含膏盐红层沉积、具有碳酸盐岩和暗色泥岩组合等,显示有利的成矿地质环境;区域和矿床内发育大规模高强度的铅锌化探异常,具有形成大型铅锌矿床的潜力.通过填图等研究,指出多才玛矿床为密西西比河谷型(MVT)矿床,产于逆冲推覆构造系统前锋带,矿体赋存于逆冲断裂上盘,受那益雄组碎屑岩和九十道班组灰岩岩相过渡部位及可能的逆冲推覆构造系统派生的反冲构造的控制,矿石主体为热液溶蚀角砾岩型.通过音频大地电磁测深测量,揭示了矿床深部物性特征和构造岩相特点,确定了孔莫陇矿段南侧深部铅锌矿化体的空间位置,并制定了钻探验证方案.经后期勘查,在预测区内探获了品位高、厚度大的铅锌矿体,使该矿段铅锌资源量由原来的76.2万吨增至259万吨,找矿取得重大突破.由此,通过综合分析,提出了一套综合地质、化探异常付化显示、地球物理、遥感等手段的多才玛式矿床定位预测方法组合. 相似文献