地球信息科学学报

地球信息科学学报 ›› 2015, Vol. 17 ›› Issue (12): 1545-1553.doi: 10.3724/SP.J.1047.2015.01545

• 遥感科学与应用技术 • 上一篇    下一篇

航空高光谱遥感金矿床定位模型及找矿应用——以甘肃北山柳园-方山口地区为例

刘德长(), 叶发旺, 赵英俊, 田丰, 邱骏挺   

  1. 核工业北京地质研究研究院 遥感信息与图像分析技术国家级重点实验室, 北京100029
  • 收稿日期:2015-03-02 修回日期:2015-05-23 出版日期:2015-12-20 发布日期:2015-12-20
  • 作者简介:

    作者简介：刘德长(1938-),男,研究员,博士生导师,主要从事遥感地质研究,目前正在进行高光谱遥感固体矿产和油气的地质找矿研究。E-mail: liudc@yeah.net

  • 基金资助:
    中国地质调查局工作项目（1212011220277、12120113099500）

Airborne Hyperspectral Remote Sensing for Gold Prospecting Around Liuyuan-Fangshankou Area, Gansu Province, China

LIU Dechang*(), YE Fawang, , TIAN Feng, QIU Junting   

  1. National Key Laboratory of Science and Technology on Remote Sensing Information and Image Analysis, Beijing Research Institute of Uranium Geology, Beijing 100029, China
  • Received:2015-03-02 Revised:2015-05-23 Online:2015-12-20 Published:2015-12-20
  • Contact: LIU Dechang E-mail:liudc@yeah.net
  • About author:

    *The author: CHEN Nan, E-mail:fjcn99@163.com

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被引次数

26 | 7

摘要：

高光谱遥感技术找矿应用是当前遥感地质领域研究的前缘和热点,国内外都在积极进行探索。本文利用核工业北京地质研究院遥感信息与图像分析技术国家级重点实验室的航空高光谱遥感成像系统（CASI/SASI/TASI）,采用甘肃柳园-方山口地区获取的高空间分辨率的高光谱遥感数据,开展了航空高光谱遥感金矿床定位模型及找矿应用研究。提出了航空高光谱遥感金矿床定位模型的构建思路,强调将目标（蚀变矿物及其组合）与背景（控制要素和成矿环境）相结合,而不是以往只重视蚀变信息,而忽视蚀变所处的地质环境;开拓出“矿床尺度的矿物精细填图技术”,并建立了工作流程,解决了建模的技术关键,明显提高了航空高光谱遥感技术在矿床范围内的填图效果。在此基础上,选择柳园-方山口地区5个各具特色的金矿床,构建了不同于其他地质勘查技术建立的5个矿床定位模式,属航空高光谱遥感矿床定位模式,为该区的高光谱遥感模式找矿奠定了基础。经对5个定位模式共性的地质分析,探讨了金矿床的形成过程,对该区的金矿床形成机理,从高光谱研究角度提出了新看法。运用所建立的定位模型,结合确立的金矿评价准则,开展了模式找矿工作,结果在柳园-方山口地区前人不知的盲区发现了3处值得进行深部探索的成矿有利地段,取得了明显的找矿效果。实践表明,航空高光谱遥感金矿床定位模型研究具有重要的理论意义和找矿价值。

关键词: 航空高光谱遥感, 金矿床, 矿床定位模型, 找矿应用

Abstract:

In this study, we obtained the airborne remote sensing data of a total area of 3500 km2 of the Liuyuan-Fangshankou area using CASI, SASI, and TASI imaging spectrometers of the National Key Laboratory of Science and Technology on Remote Sensing Information and Image Analysis, and carried out a series of studies in an attempt to establish assessment models for typical gold deposit, and evaluate the capability of airborne remote sensing in gold exploration. A procedure for the method of a sophisticated alteration mapping on an ore deposit scale has been proposed, and it was used for mapping alterations in five typical gold deposits, including Nanjintan, Huaxishan, Jingouzi, Huaniushan, and Laojinchang. In contrast to previous studies, which only use mineral alteration mapping in gold exploration without considering the mineralization condition, this study focuses on an integration of mineral alteration mapping and geological environment in which the gold mineralization occurred. The integrations of the mapping results with the geological conditions for the five deposits share similar characteristics. For example, all of these deposits have beresitization alterations, and there are relatively high gold concentrations in their wall rocks. In addition, the deposits are all controlled by geological structures and are emplaced by mafic veins. After analyzing the mineral alteration, wall rock characteristics, geological structures, and mafic veins, this study discussed the petrogenesis of these gold deposits, and proposed several criteria for gold prospecting in the Liuyuan-Fangshankou area. Based on these criteria, 3 ore prospecting areas have been recognized. These prospects were then inspected with field investigation and geochemical analysis. The results show that all these areas have Au anomalies, suggesting that airborne remote sensing is scientifically and practically important for ore exploration.

Key words: airborne hyper-spectrum remote sensing, gold deposit, locating model for ore deposit, common features, petrogenesis analysis, ore prospecting, criteria