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卫星遥感在西藏安多幅1∶25万区域第四纪地质调查中的应用
引用本文:张绪教,李团结,陆平,白志达,徐德斌,陈云芳.卫星遥感在西藏安多幅1∶25万区域第四纪地质调查中的应用[J].现代地质,2008,22(1):107-115.
作者姓名:张绪教  李团结  陆平  白志达  徐德斌  陈云芳
作者单位:中国地质大学地球科学与资源学院,北京,100083
基金项目:中国地质调查局两藏1:25万安多幅(I46C004002)区域地质调查项目
摘    要:对西藏安多县1∶25万图幅的ETM+图像进行几何精校正和镶嵌后,选取ETM+7、ETM+4、ETM+3波段进行假彩色合成并与全色波段融合,获得研究区1∶25万ETM+影像图;根据不同地质体的影像特征并结合野外踏勘,建立了遥感解译标志;对沉积物、地貌、水系及新构造等进行了初步目视解译,编制了1∶25万第四纪遥感解译图;结合野外地质调查,对研究区的第四纪沉积物的成因类型和分布范围、地貌特征及分区、新构造运动等方面进行了研究。区内分布最广的是晚更新世的冰水、冰碛物及冲洪积物;区内不仅存在晚更新世冰蚀谷,而且发育规模较大的中更新世古冰蚀谷;通过线性影像、水系及洪积扇的偏转等特征,对区内新构造进行了识别及活动性质的初步判断。此研究不但较好地体现了遥感技术在高原区域第四纪地质调查中应用的优点,而且为青藏高原隆升及其环境变迁的研究提供了参考资料。

关 键 词:遥感  青藏高原  安多县  第四纪地质  新构造
文章编号:1000-8527(2008)01-0107-09
收稿时间:2007-10-16
修稿时间:2007-12-30

Application of Satellite Remote Sensing to 1: 250, 000 Regional Quaternary Investigation in Amdo Sheet, Tibet
ZHANG Xu-jiao,LI Tuan-jie,LU Ping,BAI Zhi-da,XU De-bin,CHEN Yun-fang.Application of Satellite Remote Sensing to 1: 250, 000 Regional Quaternary Investigation in Amdo Sheet, Tibet[J].Geoscience——Journal of Graduate School,China University of Geosciences,2008,22(1):107-115.
Authors:ZHANG Xu-jiao  LI Tuan-jie  LU Ping  BAI Zhi-da  XU De-bin  CHEN Yun-fang
Abstract:On the basis of the 1∶250,000 scale ETM+ image of Amdo sheet in Tibet,by means of geometric calibration and mosaic process,bands 7,4 and 3 were chosen to achieve false color composition and panchromatic band fusion,aiming at establishing the remote sensing(RS)ETM+ images at a 1∶250,000 scale in the study area.The image characteristics of various geological units together with our field investigation were utilized to adequately identify the vital interpreting symbols.Accordingly,the primary visual interpretations to major sediments,geomorphology,water system,neotectonic features were carried out and the 1∶250,000 Quaternary RS interpretation map was obtained.By combined analysis of field geological investigation,the genetic type and distribution of Quaternary sediments,geomorphologic characteristics and zoning,neotectonic movement were discussed respectively.Our results indicate that there was a spacious distribution of fluvioglacial deposit,moraine deposit(Qp3gl+fgl)and alluvial-proluvial deposits(Qp3pl +alp)of Late Pleistocene.In target region,some large-scale glacial valleys ranging from Middle to Late Pleistocene were widely developed.With the aid of linear images,water system as well as the excursion of the pluvial fan,some typical neotectonic features were initially recognized.Our study demonstrates that the RS technique is efficient in Quaternary geological investigation of Plateau region,thus inevitably providing useful information for our further study of uplift of Tibetan Plateau and environmental evolution.
Keywords:remote sensing(RS)  Tibetan Plateau  Amdo County  Quaternary geology  neotectonics
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