北巴颜喀拉山地区岩性遥感解译标志建立

Establishment of lithological remote sensing interpretation keys in north Bayan Hara mountain

岩性解译是遥感地质解译中十分重要的内容,解译前首先要根据待解译区地质体的岩性及其组合类型建立遥感解译标志。北巴颜喀拉山群复理石建造因岩性单一、地层厚度巨大、难见顶底且化石稀少,长期以来对该套地层的划分相对困难且争议颇多,形成了众多划分方案。针对这种情况,采用遥感方法,以SPOT5和ETM卫星遥感数据为基础影像,从岩性解译入手进行了最大程度的地质信息挖掘。从4个方面详细阐述了岩性解译和岩性组合划分的依据,系统地介绍了研究区基于遥感影像的岩性可视化解译标志的建立过程。并利用所建立的解译标志重新厘定了地层的影像特征,细分了各地层岩段或岩性组合,取得了对研究区地层岩性的新认识,为北巴颜喀拉山群地层对比及区域地质调查提供了新资料。

Lithological interpretation is a very important part in remote sensing geological interpretation. First, interpretation keys must be established according to the lithology and its combination types of the geological body in the area to be interpreted. The stratigraphic division in Bayan Hara Mountain Group is relatively difficult and controversial, resulting in the existence of a large number of division schemes. That is because of single lithology, muhilayer formation thickness, single top - bottom and rare fossils of flysch formation in Bayan Har Mountains Group. Aimed at tackling this situation, using remote sensing method, and starting with the lithological interpretation based on the SPOT5 and ETM data, the authors obtained information to the greatest degree. The lithologic interpretation and classification was based on detailed elaboration from four aspects in this study. A systematical description was made on the process of establishment of interpretation keys based on visual image. And then the stratigraphie image was redelimited through the established interpretation keys. The rock section and lithological association were subdivided for each stratum. Some new understanding of formation lithology was obtained in the study area. This would provide new data for stratigraphie correlation as well as regional geological survey in Bayan Har mountains.