东昆仑造山带巴颜喀拉山群ASTER岩性信息提取!  

Extraction of Lithological Information from Bayan Har Mountain Group of East Kunlun Orogenic Belt Using ASTER Image

作　　者：宋晚郊[1] 张绪教[1] 高万里[2] 胡道功[2] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]中国地质科学院地质力学研究所,北京100081

出　　处：《现代地质》2013年第1期116-123,共8页Geoscience

基　　金：中国地质调查局矿产资源评价专项项目(1212011120215);中国地质调查局项目(1212010711510)

摘　　要：巴颜喀拉山群在东昆仑地区分布广泛,岩性复杂,准确划分其岩性对巴颜喀拉山群的地层划分及构造属性的研究具有重要意义。对东昆仑造山带巴颜喀拉山群地区ASTER图像进行几何校正和大气校正后,通过主成分分析和矿物指数等岩性信息提取方法,获得主成分分析及比值图像;根据不同地质体的影像特征并结合野外地质调查,对研究区的巴颜喀拉山群进行了岩性段的划分。研究发现:分布于南部的上巴颜喀拉山群(T3by)岩性相对单一,主要为灰-深灰色粉砂质板岩和砂岩,在影像上特征不明显,所以仍将其划分为2个岩性段;而分布于研究区北部的原下巴颜喀拉山群(T1by),影像上色调纹理特征差异较大,由此将原来的2段细化分为4段,a段主要为深灰色粉砂岩和千枚岩,b段为灰绿色细砂岩,c段为黄褐色细砂岩,d段为深灰色细砂岩夹板岩。研究结果较好地体现了遥感技术在高原区域岩性划分中的优点,同时为巴颜喀拉山群地层的对比提供了参考。The precise division of Bayan Har Mountain Group with complex lithology and widely distributed in the East Kunlun is of great significance to the stratigraphic unit division and structure property analysis. After geometric and atmospheric correction for ASTER images of Bayan Hat Mountain in the East Kunlun orogenic belt, the images of principal component analysis（PCA） and band ratio（BR） are obtained by the methods of li- thological information extraction, such as the principal component analysis and mineral index. According to the different images and field geological survey, identification and extraction of Bayan Har Mountain Group lithology information are carried out in the study area. The results show that the upper Bayan Har Mountain Group （T3by） mainly in the south is only divided into two lithology sections because of the unobvious difference of im- ages, which lithology is mainly gray-dark gray silty slate and sandstone. However, the lower Bayan Har Mountain Group （Tlby） in the north is divided into four lithology sections instead of the above two sections in the south, i.e. dark gray siltstone and phyllite （section a）, gray-green fine sandstone （section b）, yellow-brown fine sand- stone （ section c） and dark gray fine-grained sandstone slates （ section d）, and the tones and textures of the ima- ges are different. The study shows the advantages of extraction of lithological information by using RS in the plateau, and provides a reference for stratigraphic unit division and comparison for Bayan Har Mountain Group.

关 键 词：东昆仑造山带 巴颜喀拉山群 ASTER 岩性信息 

分 类 号：P627[天文地球—地质矿产勘探]