定日县岗嘎地堑盆地隐伏断层氡气特征及其活动性分析

Radon gas characteristics and activity analysis of hidden faults in Gangga Graben Basin of Dingri County

在中尼铁路的前期地质勘查工作中,岗嘎地堑盆地的活动断层对于铁路选址的影响是不可忽略的因素。为查明岗嘎地堑盆地的盆地边界断层、3个地垒的边界正断层以及其他隐伏断层的位置与活动性,开展了土壤氡气测量工作。通过测量,查明了盆地的东侧、西侧、北侧3个边界断层的大致位置,明确了3个地垒边界正断层的位置及其延伸走向。对盆地内断层的活动性进行了分析,北侧断层的活动性整体强于南侧,东侧强于西侧。研究可为中尼铁路的选址工作提供科学依据。

The active faults impact of Gangga Graben Basin on the railway site selection cannot be ignored in the geological work in the early stage of China-Nepal Railway.Soil radon measurement work was carried out to identify the location and activity of boundary faults of Gangga graben basin and three horsts,and other hidden faults.The approximate positions of the three boundary faults in the east,west,and north of the basin were ascertained and the positions and extension directions of the faults on both sides of the three horsts were verified through measurement.The faults activity within the basin was analyzed,with the overall activity of the northern faults and eastern faults being stronger than that of the southern faults and western faults.This research could provide scientific basis for the site selection work of China-Nepal Railway.