甘肃北山辉铜山地区镁铁岩体遥感识别方法研究

Lithological Discrimination of the Mafic Rocks,Huitongshan, Beishan,Gansu,Using Remote Sensing Data

ASTER(先进星载热发射和反射辐射仪)已被广泛应用于岩性识别研究中,但在国内综合采用多种方法增强并识别镁铁—超镁铁岩体信息的研究较少。以甘肃北山辉铜山地区为研究区,综合应用比值法、最小噪声分离和镁铁岩指数等方法处理研究区ASTER数据,以突出辉铜山地区镁铁—超镁铁岩信息。将处理结果与地质图对比、综合分析,圈定了11处疑似辉长岩体,对其中9处进行野外验证,全部与遥感分析结果吻合,证明了结果的有效性。该方法可以应用于西部地区镁铁—超镁铁岩体识别工作中。

ASTER （Advanced Spaceborne Thermal Emission and Reflection Radiometer） has been used ex- tensively in lithological discrimination. However, using multi-methods to enhance and identify the mafic-ultramafic rocks have rarely been reported in China. This study took Huitongshan in Beishan area,Gansu as the study area. Multi-methods such as band ratio,minimum noise fraction and mafic index were adopted to enhance and identify the mafic-ultramafic rocks using ASTER data. The study results were compared with the geological map, and conformed to be consistent with the geological map of the study area. Eleven new gabbro prospects were identified at the first time by synthetic analyses of remote sensing results and geological data. Through ground inspections of nine prospects,all the nine sites were consistent with the prospects and nine new gabbro occurrences were discovered. The result shows that using remote sensing data and multi-image processing methods are effective to map mafic-ultramafic occurrences and can be used in the remote inaccessible region.