应用气体地球化学方法探测隐伏活动断裂的初步研究

在新疆首次应用气体地球化学方法探测乌鲁木齐地区的主要隐伏活动断层。查明了碱沟-雅玛里克山北麓水磨沟活动断层隐伏段的位置,并可划分为南支(二叠纪与三叠纪地层的分界线)与北支(三叠纪与侏罗纪地层的分界线)。认为有可能存在通过市区的北西-南东向隐伏活动断层,并给乌鲁木齐河顺河断层的存在提供了气体地球化学依据。根据断层气体释放强度的分析,认为六道湾-西山马料地-头屯河一带,可能是目前工作区内构造断裂的主要活动地带。由于该方法实用、简捷、价廉、效果良好、结果可靠,可在今后的工作中大力推广,但方法本身尚待进一步完善与提高。

PRELIMINARY STUDY ON DETECTING BURIED ACTIVE FRACTURES BY MEANS OF GEOCHEMISTRY OF GAS

The method of gas geochemistry is first -time used in Xinjiang to detect the main buried active faults around Urumqi region. The result is satisfactory as we got to know the location of hidden segment on the Shuimogou active fault along Jiangou - North part of Yamalike Mt. . This discovery inferred that there might exist a buried active fault across urban district in the direction of northwest-southeast. It also supported the basis of gas geochemistry generated along the bed of Urumqi river on the buried fault. According to the result of released intensity of fault gas,we consider that the main activity region of tectonic fracture is around Liudaowan - Maliaodi,Xishan - Toutunhe,and suggest this method be used and spread widely for simplicity and applicability.