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基于ETM+与ASTER数据的矿化蚀变信息提取方法研究——以满都拉地区为例 总被引：4，自引：0，他引：4
本文以满都拉地区为试验区,以ETM 和ASTER为数据源,选择了多种方法对全区及四个重点区进行了遥感矿化蚀变信息提取研究。研究结果表明:(1)在利用ETM 数据提取区域性矿化蚀变信息中,传统的Crósta技术在该区取得了较好的效果,提取的遥感矿化蚀变信息与区域已知矿点有显著的相关性,圈定的成矿远景区对区域找矿有着重要参考价值;(2)构建的ASTER数据提取矿化蚀变信息的系列方法是有效的,它大大提高了泥化蚀变信息的可识别性;(3)ETM 数据与ASTER数据的结合使用将有利于进一步扩展遥感技术在区域矿产调查中的应用前景。 相似文献
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《西北地质》2020,(1)
高植被覆盖区遥感矿化蚀变信息提取结果会受植被覆盖影响其效果。笔者基于西秦岭大桥—石峡地区,利用ETM和Aster影像数据,进行高植被覆盖区遥感矿化蚀变信息提取研究,探讨抑制植被干扰和提取遥感矿化蚀变信息的方法,提出了多元数据叠加分析法。采用"混合像元法剔除干扰+多层次分离技术分析波段相关关系+多元数据叠加分析法增强蚀变信息+正态分布阈值分割法分级提取"等系列方法,提取了研究区遥感铁染和羟基异常,其中铁染异常区占研究区面积1.63%,羟基异常区占研究区面积1.26%。矿床点与遥感异常相关比率为45.5%,说明该方法在高植被覆盖区提取遥感矿化蚀变信息效果较好,具有一定示矿意义。 相似文献
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依据工作区ETM+数据特征,采用主成分分析、比值处理、平滑滤波等技术进行遥感蚀变信息提取、获得遥感蚀变信息异常图。深入研究蚀变信息异常的分布特征,结合区域成矿特点,表明蚀变异常信息是重要的找矿标志。 相似文献
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ASTER遥感数据蚀变遥感异常提取研究 总被引：14，自引：0，他引：14
基于ETM+/TM数据提取矿化蚀变遥感异常已趋于成熟, 而利用ASTER(先进星载热发射和反射辐射仪)遥感数据提取矿化蚀变遥感异常鲜有报道。本研究利用USGS波谱数据库中典型蚀变矿物反射率数据, 重建其在ASTER数据中波谱曲线研究表明, ASTER遥感数据可以提取Mg-OH、Al-OH、CO32?和Fe3+离子(基团)信息。热液矿床的蚀变围岩通常含有上述4种离子(基团), 它们的波谱特征是蚀变遥感异常提取的理论依据。本研究利用改进“去干扰异常主分量门限技术流程”, 以河北省承德地区和太行山区为例, 上述离子(基团)信息提取结果与野外实际分布相一致, 表明利用ASTER遥感数据提取上述4种离子(基团)信息是可靠的。 相似文献
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通过龙朋等6幅1∶5万区域地质调查,对云南建水地区进行遥感地质解译和蚀变信息提取。在充分收集数据资料、了解掌握该区地质背景的基础上,利用Landsat ETM+和2.5 m高分辨率ALOS遥感数据,进行各种图像增强处理。结合地质资料,建立解译标志,对研究区的岩性地层、断裂、线性构造进行解译。分析典型蚀变矿物的波谱特征,利用ETM+遥感数据提取与矿化紧密相关的蚀变异常信息,将提取的线性构造和蚀变异常信息与研究区地质、矿产资料结合,对遥感异常区进行初步评价,明确找矿方向,为研究区后续找矿工作提供参考。 相似文献
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ETM+数据在甘肃省肃北县黑刺沟一带蚀变遥感异常信息提取中的应用 总被引：3，自引：2，他引：1
遥感卫星的多光谱数据应用于找矿已取得显著的成效,ETM+数据因涵盖波长范围宽、波段多、价格合理等因素,而逐渐广泛应用。笔者利用ETM+数据到黑刺沟一带进行蚀变遥感异常提取,提取的蚀变异常与野外地质情况吻合性好,分别提取了铁染和黏土化蚀变遥感异常,并采用了掩膜技术消除了云、冰雪、盐碱地、盐碱滩和植被的干扰。 相似文献
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Satellite remote sensing data are usually used to analyze the spatial distribution pattern of geological structures and generally serve as a significant means for the identification of alteration zones. Based on the Landsat Enhanced Thematic Mapper （ETM＋） data, which have better spectral resolution （8 bands） and spatial resolution （15 m in PAN band）, the synthesis processing techniques were presented to fulfill alteration information extraction： data preparation, vegetation indices and band ratios, and expert classifier-based classification. These techniques have been implemented in the MapGIS-RSP software （version 1.0）, developed by the Wuhan Zondy Cyber Technology Co., Ltd, China. In the study area application of extracting alteration information in the Zhaoyuan （招远） gold mines, Shandong （山东） Province, China, several hydorthermally altered zones （included two new sites） were found after satellite imagery interpretation coupled with field surveys. It is concluded that these synthesis processing techniques are useful approaches and are applicable to a wide range of gold-mineralized alteration information extraction. 相似文献
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Alteration is regarded as significant information for mineral exploration. In this study, ETM remote sensing data are used for recognizing and extracting alteration zones in northwestern Yunnan (云南), China. The principal component analysis (PCA) of ETM bands 1, 4, 5, and 7 was employed for OH- alteration extractions. The PCA of ETM bands 1, 3, 4, and 5 was used for extracting Fe2 (Fe3 ) alterations. Interfering factors, such as vegetation, snow, and shadows, were masked. Alteration components were defined in the principal components (PCs) by the contributions of their diagnostic spectral bands. The zones of alteration identified from remote sensing were analyzed in detail along with geological surveys and field verification. The results show that the OH" alteration is a main indicator of K-feldspar, phyllic, and prophilized alterations. These alterations are closely related to porphyry copper deposits. The Fe2 (Fe3 ) alteration indicates pyritization, which is mainly related to hydrothermal or skarn type polymetallic deposits. 相似文献
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新疆托里金矿带矿化蚀变体系及遥感混合蚀变信息分解-复合提取研究 总被引：1，自引：0，他引：1
文章以新疆西准噶尔托里金矿带为例，基于ETM数据源，在矿区矿化蚀变体系系统研究基础上，以典型岩、矿石地物波谱的差异性为依据，设计出适合本区的混合矿化蚀变信息分解-复合提取方法，通过混合蚀变信息分解、多变量蚀变信息增强、对增强图像（复合）合成3个工作环节，形成最终的蚀变信息提取图像。经对比后，有18处遥感异常为已知金矿的反映，有3处遥感异常已提供国土资源大调查使用。 相似文献
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新疆乌什塔拉地区位于中亚天山成矿带的东南部,该成矿带上已发现众多矿床。在乌什塔拉地区开展地质矿产调查时,为快速确定找矿靶区,以遥感技术为先导,利用ETM+自然彩色合成、最小噪声分离等方法解译岩体、断层;之后对ETM+数据采用掩膜技术剔除干扰后,利用主成分分析法提取矿化蚀变信息;并将地质、化探、遥感等多元信息叠合进行综合分析。结果表明,利用主成分分析法提取的蚀变信息与化探异常、岩体、断层吻合较好,蚀变信息在工作区西北部、北部(喀拉塔格附近)及南部(阿拉塔格附近)具有面状、带状分布特征,而在工作区西南部、中部(阿勒格乌拉西)及东南部(扎合布拉格北沟附近)等地具有线状特征。经综合分析、筛选,共圈定了19处找矿靶区,对其中5处重点部位进行野外检查,发现利用主成分分析法提取的蚀变异常多由岩脉、断层、夕卡岩化、黏土化、褐铁矿化等引起。对蚀变带取样化学分析,确定了金、铜、铁矿化点3处。 相似文献
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Geochemical data of altered wall rocks are important for the metallogenic prognosis of hydrothermal gold deposits. Indicator elements of altered wall rocks such as K, Al, As, Sb, and Hg have been successfully used to assess gold anomalies in lithogeochemical survey. However, such researches have rarely been done in stream sediment survey for the exploration of gold from various landscapes. On the basis of the geochemical analysis of altered wall rocks of gold deposits in the cold desert areas of Gansu (甘肃) Province in Northwest China, it is found that the combination of Al, K, and Sn could serve as an important indicator of hydrothermal gold deposits and can be used to evaluate the metallogenic prospective of gold anomalies in stream sediments. More studies performed in the cold grassland areas and the moderate-low relief mountainous areas showed that, both weak and strong geochemical anomalies can be extracted, if strictly abiding by the ways of calculation and addition of the binary values of the indicator elements with equal weight, and this provides the sound delineation of metallogenic perspective areas. 相似文献
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从"景"、"场"、"相"、"床"4个等级体制观点出发,阐述了该金属成矿省成矿内部组成,观点新颖。金矿赋存于中新世-更新世马林丹群火山岩中,该群火山岩呈零星岛状散布于斯丹岗-哥塔巴托-大姑玛线性构造活动带(SCDL)的东部,并受到后期安山玢岩的侵入。安山玢岩具有埃达克岩性质,它的侵入对于后期的围岩蚀变和成矿作用起到重要的控制作用。拉拉布矿床的安山岩具有明显的热液蚀变,属于冰长石-绢云母型金矿化,认为金是在PH值近中性的浅表环境中由于热液沸腾并伴随流体的混合沉淀而成,通常富集于标高30~200m之间。围岩蚀变强度大,并有明显的分带规律,制约着金矿的形成。金的富集与下列地质事件相关:(1)形成角砾岩之前的围岩蚀变作用;(2)热液角砾岩的形成;(3)形成角砾岩后的围岩蚀变作用;(4)金矿形成。 相似文献
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Malogo J M Kongola Wang Ende 《中国地质大学学报(英文版)》2005,16(3):250-255
INTRODUCTION AccommodationZones Currentmineralexplorationconceptshavefailed torecognizetheassociationofmineralizationwith uniqueextensionalstructurescalledaccommodation zones(Fauldsetal.,1987).Inmostcases,these zonesshowlittleobviousdeformation,yetfocusfl… 相似文献
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A Comparative Study of Landsat‐7 and Landsat‐8 Data Using Image Processing Methods for Hydrothermal Alteration Mapping 
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下载免费PDF全文 Feizollah Masoumi Taymour Eslamkish Mehdi Honarmand Ali Akbar Abkar 《Resource Geology》2017,67(1):72-88
Comparing spaceborne satellite images of Landsat‐8 Operational Land Imager (OLI) and Landsat‐7 Enhanced Thematic Mapper plus (ETM+) was undertaken to investigate the relative accuracy of mapping hydrothermal alteration minerals. The study investigated the northern part of Rabor, which contains copper mineralization occurrences, and is located in the Kerman Cenozoic magmatic assemblage (KCMA), Iran. Image processing methods of band ratio, principal component analysis (PCA), and spectral angle mapper (SAM) were used to map the distribution of hydrothermally altered rocks associated with the porphyry copper mineralization. The band ratio combination of both sensors for mapping altered areas showed similar outcomes. PCA exposed variations in the spatial distribution of hydroxyl‐bearing minerals. The representation of hydrothermal areas using OLI data was more satisfactory than when using ETM+ data. SAM analysis found similar results for mapping hydroxyl‐bearing zones. Verification of the results came through ground investigation and laboratory studies. Rock samples (n = 56) were collected to validate results using thin sections, X‐ray diffraction (XRD) and spectral analyses. Field observations and laboratory analysis revealed that phyllic and propylitic alterations dominate the alteration zones in the study area. Argillic and iron oxides/hydroxides alterations were observed to a lesser degree. The results indicate that alteration maps prepared by OLI data using PCA for visual interpretation are more suitable than those of ETM+ due to a higher radiometric resolution and lower interference between vegetation and altered areas. As the spectral bandwidth of ETM+ band 7 covers absorption feature of propylitic alteration, better mapping of propylitic alterations is achieved using ETM+ data. 相似文献
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应用多光谱ASTER数据对ETM遥感异常的定性判别研究——以东昆仑五龙沟为例 总被引：5，自引：0，他引：5
文中讨论了新的找矿参数——蚀变遥感异常的地质基础和光谱前提,在矿床地质学和蚀变矿物光谱参数特征的基础上,编制了一张用于遥感异常提取及对其地质解释的表格。ETM遥感异常提取技术已在全国推广,ASTER数据可以在三个方面对已推广的ETM起到重要的补充作用：1.利用短波红外增设的波段,对某些矿致异常区分其矿化（矿床）类型;2.利用增设的热红外波段区分某些岩性;3.可有助于解决ETM因第7波段太宽而产生的许多疑难问题。本文以东昆仑五龙沟为例讨论了ASTER对于解决ETM遥感异常性质判别困难方面的作用。 相似文献