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尕尔穷铜金矿的发现是近年来在西藏班公湖-怒江成矿带西段取得的重要找矿突破之一,目前已发现的矿体类型主要有接触交代矽卡岩型和构造破碎带型2种。前人在该区的研究已经注意到矽卡岩与花岗斑岩的成生联系,斑岩型矿产的成矿潜力较大。该文利用多光谱遥感图像,以寻找区内斑岩型矿床为目标,开展了线性构造、环形构造、铁帽类色要素和围岩分带的遥感解译,基于主成分分析法提取了遥感羟基异常和铁染异常。研究结果表明:区内主要发育NW-NNW向、NE-NNE向和近SN向3组线性构造;环形构造按组合样式可划分为5个环形构造系;铁帽类色要素与遥感异常较吻合;区内围岩分带较复杂,但多属斑岩铜矿成矿的有利围岩。综合分析认为,5个环形构造系为进一步找矿的重点区域。 相似文献
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苏门答腊岛DMC多光谱数据地质应用初步分析 总被引:4,自引:1,他引:4
利用灾后苏门答腊岛DMC32米多光谱遥感图像,经过几何精校正、主要地名标注、波段B2(R)、B1(G)、B3(B)组合和直方图正态增强处理制作了影像图,图像总体纹理信息较弱,但对海啸受灾区有突出作用。为了突出不同区域植被的色差和纹理信息,对影像图进行比值增强组合处理实验,比值增强处理后的图像对空间纹理有增强效果。依据DMC增强图像显示的纹理影像特征,通过人机交互方式对图像中有较明显规律的线状和环状纹理信息进行提取和制图,作为进一步分析该地区构造活动及与之相关地质灾害的基础依据。通过对图像的纹理信息综合分析,发现该地区存在着大量的线形纹理信息和一些环形和火山机构影像信息,这些影像特征可能与该地区的一些地质活动有关,如新构造运动、活动断裂和火山活动中心、火山机构等。结合已知的地质、遥感三维立体图像和早期的TM图像资料,根据遥感图像上显示的特殊的地形和水系、线性纹理分布特征和典型地质体与断裂构造的遥感解译标志,对部分线性影像和环状影像的地质意义进行了解译,认为北西断裂为岛内的主干断裂,其次是与其相垂直配套的北东向断裂。初步分析了可能控制或诱发该地区地质灾害的断裂分布特征,推断出三处泥石流、崩塌、滑坡等地质灾易发区和两处火山活动可能区域。所推断的地质灾害易发区具备了泥石流、崩塌、滑坡等灾害形成、流通、堆积等先决条件,如果植被遭到破坏,一旦遇到强降雨影响,极有可能诱发上述地质灾害。火山活动区均处于北东向断裂带与北西向断裂带的交汇部位,根据地质构造和遥感影像特征分析推断,区内地震及火山活动有可能受板块活动地震影响而再次激活,形成新的地质灾害。以上遥感地质信息,在进一步经过相关资料和实地调查证实后,对岛内灾后重建及减灾、抗灾等活动具有积极指导意义。 相似文献
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研究区位于四川盆地的东北部,是一个油气的重要勘探区。为了进一步缩小勘探靶区,在10万平方公里的范围内采用了卫星遥感影像与区域地球物理资料(航磁,重力)的复合研究,同时与区域地质资料进行综合分析,发现了一些与油气田分析密切相关的长期活动的隐伏断层以及一系列的环形构造,为进一步油气勘探,提供了一批远景地区。 相似文献
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西成铅锌矿田地处我国腹地,位于甘肃省西和县、成县及徽县境内,是我国重要的有色金属矿产基地。 矿田所在区,环形构造发育。陇南环为一巨型同心圆环状环形构造,由东西向、北东向及北西向三组串环交汇形成。 陇南环构造位于秦岭褶皱系中段,区内线性构造复杂,其中东西向、南北向及北东向线性构造规模较大,属壳源性基底型断裂。陇南环内的西成矿田一带泥盆纪的海盆形态受该环形构造的发生、发展控制,其环核部位为一水下隆起。 在陇南环展布范围内,东西向断裂系控制着成矿带的展布;北东向断裂系与东西向断裂系的复合部位控制着矿田;而南北向或北… 相似文献
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遥感信息量化处理在西昌地区构造解析及油气远景预测中的应用 总被引:5,自引:1,他引:5
该文从地质遥感信息定量分析着手、通过对遥感图像进行处理和信息提取, 新发现大量重要地质构造信息。并按不同构造层次对线性、环形构造等信息进行了量化处理, 进一步建立了研究区区域构造和重要构造区带遥感信息三维彩色量化解析模式。通过区域断裂系统量化解析, 确定了相对稳定的含油气构造地块和重要的构造区带; 通过重要构造区带遥感解译的环形构造及与其有成因联系的环状、放射状大节理的量化处理和定量解析, 确定了含油气局部构造。最后通过局部构造综合评价研究, 预测了含油气远景区。 相似文献
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斑岩型铜矿找矿预测中环形构造的示矿作用——以玉龙—马拉松多子区为研究区 总被引:2,自引:0,他引:2
在斑岩型铜矿资源潜力评价中,斑岩体是圈定铜矿最小找矿预测区的重要依据。研究表明,遥感图像上的许多环形影像与岩浆活动(包括斑岩体)有关。为了快速进行斑岩型铜矿成矿预测,利用遥感技术在西藏玉龙—马拉松多斑岩型铜矿周边地区开展了找矿预测。首先建立了环形构造的遥感解译标志;然后开展了环形构造的解译工作,研究了该区环形构造的展布特征;最后总结了由环形构造推断斑岩体的标志。结果表明,遥感解译的环形构造为该区斑岩型铜矿最小找矿预测区的圈定提供了重要依据。 相似文献
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1.环形构造解译 本区位于我国南北地震带北段(武都至海原)。本文利用陆地卫星MSS、TM合成图像和部分航片,以及经过大量的光学影像增强处理的图像提取了大量环形影像,并结合地形地貌、地质、地震及地球物理资料分析,解译出直径大于15km的环形构造33个。据至1991年底的地震历史记载,区内共发生M≥4级的地震94次,统计结果表明,其中68次位于环形构造的内部或边缘,占总数的72%。 2.环形构造的控震作用 研究环形构造及其控震作用,有助于提高对本区地震构造环境研究的深度和广度,从而对本区地震危险性评价和地震的预测预报有一定的实际意义。 (1… 相似文献
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宁夏区地质构造与围岩蚀变遥感信息提取 总被引:1,自引:0,他引:1
为了对宁夏回族自治区(以下简称为宁夏区)矿产资源潜力进行评价,以ETM+遥感数据为基础信息源,首先采用人工目视解译和计算机自动提取方法提取了宁夏区线性、环形构造信息;然后应用主成分分析和光谱角法提取了铁染和羟基蚀变异常信息;最后,结合区域地质构造条件,综合分析总结了宁夏区线性、环形构造特征和蚀变异常的分布特征及其示矿意义。研究结果表明:提取的区域线性构造与宁夏区地质研究确立的区域构造格架展布形态基本吻合;在卫宁北山、贺兰山北段等重点找矿远景区,构造和蚀变异常信息是矿产资源潜力评价的主要要素。根据提取的构造和蚀变异常信息圈定的找矿靶区(或称遥感最小预测区),为在以上地区开展矿产资源勘查和潜力评价提供了参考依据,并在局部地段得到了勘探结果验证。 相似文献
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川南区域构造变形及应力场遥感图像定量解析 总被引:13,自引:0,他引:13
采用区域构造变形及应力场遥感图像分层解析法,利用遥感TM图像对研究区宏观构造及有关的横张大节理系统进行详细解译,结合物探资料并应用力学方法对区域构造变形场和应力场进行了计算与分析,建立了该区构造变形场和应力场的三维彩色定量解析模式图,通过综合分析研究,对该区构造组合的空间格局及其控矿(油气)规律进行了探讨。 相似文献
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Abstract Tectonic mapping and geologic evolution of a region were historically conducted on the basis of field observations. After the advent of remote sensing technology, tectonic mapping became much easier and structural mapping through imagery has gained credibility and suitability in regional mapping, tectonic evolution and modeling. In this regard, an attempt has been made to make use of the satellite technology to bring out the structural trends and the fracture/lineament pattern in Biligirirangan region of Northern Tamil Nadu through satellite remote sensing. The folded architecture in Biligirirangan region has evolved from structural trends. The subsurface structures of the region were derived through resistivity contours and resistivity images created by GIS software. The surficial information derived from the satellite imagery and subsurface structures derived from the resistivity contours and images were integrated with field observations. This integration has given a clear tectonic picture of the Biligirirangan region and the tectonic structures were then analysed for tectonic forces, evolution and modeling. The study determined that the Structural trends were mostly in a N‐S direction and the folds were of isoclinal type with alternating synclinal and anticlinal folds of an easterly dipping nature. These folds in conjunction with the lineaments have brought out the palaeostress pattern of the Biligirirangan region. The study further suggests that the regional compressive force trending in ENE‐WSW direction was responsible for the present configuration of folds. In addition, the study also focuses the efficacy of the satellite imagery in tectonic analysis and the resistivity contours and images for the subsurface structural analysis. 相似文献
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本文主要探讨了与压实褶皱有关的一类隐蔽油气藏的TM图像解译原理。根据压实褶皱的成因机制,对其盖层应力分布状况及其在后期构造运动中的受力变动情况进行了分析,提出与压实褶皱同时伴生的还有一系列特殊的裂隙型式,它们不仅为油气的储集提供了空间,而且在空间上还组成了特殊的组合型式(图像上呈现一定的图案),它们经过后期的风化剥蚀后可呈现出典型地貌特征。利用TM图像具有多波段、适中分辨率的优势可以在图像上对这些特殊的裂隙型式进行识别,从而可直接在图像上解译出埋丘、礁体、碎屑灰岩体、较纯的砂岩体、盐丘等形式的隐蔽油气构造。为进行油气勘探的靶区预测提供了一种更为迅速经济的手段。 相似文献
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The extraction of lineaments and anomalous patterns in the Singhbhum Shear Zone, Jharkhand, India, has multifaceted applications for mineral exploration as well as for geological interpretation of neotectonic movements. ERS-1 SAR data are very useful for such applications because of their structural information content. A comparative study has been attempted with ERS, Landsat and IRS images for the interpretation of various geological structures over the Singhbhum Shear Zone. The Rose diagram generated from this study has shown major trends that matched well with the geological map of the area and the associated tectonic boundary as well as with the results obtained from ground based studies. 相似文献
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S. Kundu A. K. Saha D. C. Sharma C. C. Pant 《Journal of the Indian Society of Remote Sensing》2013,41(3):697-709
A comprehensive Landslide Susceptibility Zonation (LSZ) map is sought for adopting any landslide preventive and mitigation measures. In the present study, LSZ map of landslide prone Ganeshganga watershed (known for Patalganga Landslide) has been generated using a binary logistic regression (BLR) model. Relevant thematic layers pertaining to the causative factors for landslide occurrences, such as slope, aspect, relative relief, lithology, tectonic structures, lineaments, land use and land cover, distance to drainage, drainage density and anthropogenic factors like distance to road, have been generated using remote sensing images, field survey, ancillary data and GIS techniques. The coefficients of the causative factors retained by the BLR model along with the constant have been used to construct the landslide susceptibility map of the study area, which has further been categorized into four landslide susceptibility zones from high to very low. The resultant landslide susceptibility map was validated using receiver operator characteristic (ROC) curve analysis showing an accuracy of 95.2 % for an independent set of test samples. The result also showed a strong agreement between distribution of existing landslides and predicted landslide susceptibility zones. 相似文献
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多光谱假彩色合成遥感影像已经广泛应用于线性构造解译,受构造应力场制约,区域构造均具有显著的定向性,当卫星影像拍摄时光照方向与区域线性构造方向不能匹配时,构造特征常常不能很好显示,从而影响解译效果。文章提出一种利用数字高程模型模拟特定方向光照模型增强多光谱影像的新方法,用垂直于解译目标的最佳光照模型替代原光照模型以增强区域构造线性特征,同一地区对不同方向的构造解译采用了不同方向的光照模型,有效提高了线性构造信息的可解译程度。以四川盆地西侧的龙门山以南地区为例,进行了断裂构造的遥感解译,对该区地震研究和油气勘探工作具有参考意义。 相似文献
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在卫星像片上,众多线性影像与环状影像显示清晰。研究证明,这些线性影像和环形影像均是地表一些线性构造和环形构造的映像,而这些线性、环形构造与矿产、水、油气矿藏形成分布、地震活动、工程地质及地壳稳定性等,都有着密切的关系。因此,进一步深入研究线性构造、环状构造,具有重要的实际意义。 相似文献
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Adel Sharifi Abbass Malian Abolfazl Soltani 《Journal of the Indian Society of Remote Sensing》2018,46(9):1507-1518
One of the main geological evidence for many ore-bearing deposits and mineralized regions is the existence of points in highly fractured zones and the fragmentation intensity resulted from development of hydrothermal alteration along the fractures, the process leading to the occurrence of ore deposits. In this paper, a new algorithm has been proposed including a set of image processing techniques for detection the lineaments in satellite images by means of programming in MATLAB environment. The set of utilized methods includes line segment extraction by EDLine algorithm, merging line segments by Tavares method and linking the resulting line segments based on the collinearity and proximity criterion. The tectonic structures were stabilized by B-Spline curve fitting. The proposed algorithms were implemented on the ASTER image of a structurally multiple fractured region located in the central Iran, and the lineament map of Venarch area has been depicted. The results obtained from the proposed algorithms indicate a high accuracy of the operations detection of 80% for the reference map lineaments and the overall accuracy of the method is effectively reported as 62%. Combination of the above algorithms proposes a new method that precisely resulted in obtaining image processing of geological evidence for increasing the accuracy and decreasing the risk, before any field operations. 相似文献