基于遥感短波红外技术的三维蚀变填图——以低硫化浅成低温热液型矿床斯弄多为例
发布时间：2018-10-09 15:42
【摘要】：斯弄多银(金)-铅-锌矿床是冈底斯南缘林子宗群火山岩中发现的首例低硫化浅成低温热液型矿床,其发现对于完善区域成矿系列,开拓区域找矿方向都具有重要的意义。本文采用遥感技术与短波红外技术相结合的方法,通过三维建模重现了地表-地下的蚀变矿物组合,形成了星-空-地一体化的三维蚀变填图。本文采用多光谱遥感ASTER数据提取了地表围岩蚀变信息,通过遥感波段比值算法的铁染指数(b2+b3)/b1、镁羟基指数(b6+b9)/(b7+b8)、铝羟基指数(b5/b8)+(b6/b9)分别圈定了矿区地表含有Fe~(3+)、Fe~(2+),Al-OH和Mg-OH等基团的蚀变矿物信息;采用短波红外技术提取了岩心中的绢云母、蒙脱石和伊利石等矿物,并确定了地下的蚀变矿物组合。研究表明,(1)地表蚀变中的Al-OH蚀变信息与钻孔中绢云母的分布非常吻合,遥感的Al-OH信息可作为重要的找矿线索;(2)根据地下蚀变矿物的种类分布,能够确定地表铁染蚀变矿物主要表现为大量褐铁矿化(野外特征明显)、少量黄钾铁矾及绢云母;(3)绢云母形成环境的不同导致其二八面体结构发生变化:Al~ⅥAl~Ⅳ?Mg~ⅥSi~Ⅳ和Fe?Mg,是Mg-OH基团与Al-OH信息在地表部分叠合的重要原因;(4)钻孔中伊利石反射光谱特征参数计算表明,伊利石结晶度(SWIR-IC)在钻孔中呈规律性变化,近矿部位SWIR-IC(1.1~1.4)值域较低,说明伊利石形成温度较低,可能是黏土矿物成岩过程中蒙脱石向伊利石的转化递进反应,远矿段SWIR-IC(1.6~2.1)值域较高,说明该矿物较近矿段而言形成温度相对较高,是绢云母伊利石化的具体反映。
[Abstract]:The silver (gold) -lead-zinc ore deposit in Sinondo is the first low-sulfide epithermal hydrothermal deposit found in the volcanic rocks of Linzizong group in the southern margin of Gangdes. The discovery of the deposit is of great significance to the improvement of regional metallogenic series and the exploration direction of regional prospecting. In this paper, by using the method of remote sensing and short-wave infrared technology, the alteration mineral assemblage between surface and underground is reconstructed by three-dimensional modeling, and a three-dimensional alteration mapping is formed. In this paper, multispectral remote sensing ASTER data are used to extract the alteration information of surrounding rock. The iron-dye index (b2b3) / b1, magnesium hydroxyl index (b6b9) / (b7b8) and aluminum hydroxyl index (b5/b8) (b6/b9) obtained by the remote sensing band ratio algorithm have been used to delineate the alteration mineral information of Fe~ (3) Fe2 + Al-OH and Mg-OH groups in the surface of the mining area, respectively. The sericite, montmorillonite and Illite minerals in the core were extracted by short-wave infrared technique, and the altered mineral assemblage was determined. The results show that (1) the distribution of Al-OH alteration information in surface alteration is in good agreement with the distribution of sericite in boreholes, and the Al-OH information of remote sensing can be used as an important prospecting clue; (2) according to the species distribution of underground altered minerals, It can be determined that the surface iron-stained altered minerals are mainly characterized by a large amount of limonite (with obvious field characteristics), a small amount of vitriol and sericite, (3) the dioctahedron structure changes due to the different forming environments of sericite, and the structure of dioctahedron changes as a result of the variation of the structure of dioctahedron. Mg~ 鈪，
本文编号：2259870
[Abstract]:The silver (gold) -lead-zinc ore deposit in Sinondo is the first low-sulfide epithermal hydrothermal deposit found in the volcanic rocks of Linzizong group in the southern margin of Gangdes. The discovery of the deposit is of great significance to the improvement of regional metallogenic series and the exploration direction of regional prospecting. In this paper, by using the method of remote sensing and short-wave infrared technology, the alteration mineral assemblage between surface and underground is reconstructed by three-dimensional modeling, and a three-dimensional alteration mapping is formed. In this paper, multispectral remote sensing ASTER data are used to extract the alteration information of surrounding rock. The iron-dye index (b2b3) / b1, magnesium hydroxyl index (b6b9) / (b7b8) and aluminum hydroxyl index (b5/b8) (b6/b9) obtained by the remote sensing band ratio algorithm have been used to delineate the alteration mineral information of Fe~ (3) Fe2 + Al-OH and Mg-OH groups in the surface of the mining area, respectively. The sericite, montmorillonite and Illite minerals in the core were extracted by short-wave infrared technique, and the altered mineral assemblage was determined. The results show that (1) the distribution of Al-OH alteration information in surface alteration is in good agreement with the distribution of sericite in boreholes, and the Al-OH information of remote sensing can be used as an important prospecting clue; (2) according to the species distribution of underground altered minerals, It can be determined that the surface iron-stained altered minerals are mainly characterized by a large amount of limonite (with obvious field characteristics), a small amount of vitriol and sericite, (3) the dioctahedron structure changes due to the different forming environments of sericite, and the structure of dioctahedron changes as a result of the variation of the structure of dioctahedron. Mg~ 鈪，
本文编号：2259870
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