碳酸岩U系测年在滇西北北衙组地层抬升速率计算中的应用  

Application of Carbonatite Uranium Series Dating Method in the Calculation of the Beiya Formation Stratigraphic Uplifting Rate in Northwest Yunnan

作　　者：罗文行 周云 房艳国 李路 肖宙轩 林靖愉 杨鹏 Jianxin ZHAO LUO Wenxing;ZHOU Yun;FANG Yanguo;LI Lu;XIAO Zhouxuan;LIN Jingyu;YANG Peng(Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;School of EarthSciences and Resoursces,Chang'an University,Xi'an,710054,China;School of Marine Sciences,Sun Yat-sen University,Zhuhai 519082,China;Radiogenic Isotope Facility,School of Earth Sciences,The University of Queensland,Qld 4072,Australia)

机构地区：[1]长江勘测规划设计研究有限责任公司,武汉430010 [2]长安大学地球科学与资源学院,西安710054 [3]中山大学海洋科学学院,广州519082 [4]澳大利亚昆士兰大学放射性同位素重点实验室,澳大利亚昆士兰州4072

出　　处：《华南地震》2019年第3期1-5,共5页South China Journal of Seismology

基　　金：国家重点研发计划:隧洞穿越活断层围岩—衬砌灾变机制及抗断技术(2016YFC0401803)

摘　　要：自第四纪以来,滇西北地区地壳活动强度明显增强,地震活动频繁,区域稳定性越来越低,人类生存环境严酷。选取滇西北地区鹤庆—洱源断裂带经过的北衙组地层作为研究对象,通过对干涸的溶洞内鹅管碳酸盐矿物进行U系不平衡法准确定年,厘定出构造隆升作用的起始时间,最终计算得出该套地层抬升速率为2.4mm/a。北衙组地层的迅速抬升,反映了滇西北地区作为青藏高原东南扩展前缘的地球动力学过程,可能与青藏高原下地壳物质向滇西流动汇聚有关。同时,该抬升速率为滇西地区国家重大工程建设的设防抗震提供了可靠的数据支撑。Since the Quaternary,the intensity of crustal activity in the northwestern Yunnan region has been significantly enhanced,earthquake activity is frequent,regional stability is getting lower and lower,and human living environment is harsh.The paper selected the Beiya formation as the research object,which was been through with the Heqing-Eryuan fault zone.By using the U series unbalance method of the goose tube in the dried karst cave,the starting time of the tectonic uplift is determined.Finally,the uplift rate of Beiya formation is calculated to be 2.4mm/a,which provides reliable data support for the major construction of the country.

关 键 词：U系测年 构造隆升 抬升速率 北衙组 滇西北 

分 类 号：P597.3[天文地球—地球化学]