长白山地区晚新生代火山地貌形态研究及其地质应用

A STUDY ON THE CHARACTERISTICS OF LATE CENOZOIC VOLCANIC TERRAIN IN CHANGBAISHAN MOUNTAIN AND ITS GEOLOGICAL APPLICATION

长白山地区晚新生代火山岩规模巨大而且来源复杂。本次研究主要基于新生火山岩与基底地质体在地貌形态上的差异及火山口群和锥状火山口的地貌特征,利用ASTER-GDEM数据,通过地形高程、地势起伏度、坡度、典型剖面、地形参数等分析手段,对比区域地质调查成果,对长白山晚新生代火山岩区的地貌形态进行解译、分析。解译所得到的研究区晚新生代火山岩、火山口群和锥状火山口的分布特征与地质调查结果基本一致。地形剖面分析揭示甄峰山火山口群呈现熔岩高地的地貌特征,指示裂隙式火山活动,其他火山口群均呈锥状火山地貌特征。各锥状火山口群的地形参数特征与地质资料所确定的形成顺序较为一致。在各锥状火山口群及周边地区共解译锥状火山口149个,正确率75%,预测15个,对进一步野外地质调查具有指示意义。此外,综合解译结果及前人地质调查分析,认为长白山晚新生代火山岩及火山口群分布受NW向深大断裂的控制。

The Late Cenozoic volcanic rock in Changbaishan Mountain distributes across Sino-Korean border.It is in large scale with complicated origin.This paper mainly interprets and analyzes the morphology characteristics of the Late Cenozoic volcanic rock in Changbaishan Mountain,based on the different morphology characteristics of the Late Cenozoic volcanic rock and its basal geologic body,as well as those of the volcano groups and cone-shaped craters.The main method is to compare the interpretation on the topography elevation,fluctuation range,slope,typical profiles,topography parameters of Changbaishan Mountain,with previous regional geological research results,using the ASTER-GDEM data published in June 2009 by NASA and METI.After analysis,the distribution characteristics of the Late Cenozoic volcanic rock,the volcano groups and the cone-shaped craters are basically in accordance with the geological research results.The typical profile analysis shows that the volcano group of Zhenfeng Mountain has the lava plateau morphology characteristics,indicating fissure eruption,and the other volcano groups all possess the cone-shaped volcano morphology characteristics.The terrain parameter characteristics of these coneshaped volcano groups are closely related with the formation sequence confirmed by geological data.There are 149 cone-shaped craters interpreted in these cone-shaped volcano groups and surrounding areas,with the precision of 75％,predicting 15,which has an indicating significance for further geological field work.In addition,according to integrating the interpretation results and previous geological researches,it is concluded that the Late Cenozoic volcanic rock of Changbaishan Mountain and the distribution of volcano groups are controlled by activities of NW-trending fault.