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作 者:范鹏啸 于常青[2,3] 王瑞雪 曾祥芝[2,3] 李卫强[2,3] 张玥 雷晨露 FAN Pengxiao;YU Changqing;WANG Ruixue;ZENG Xiangzhi;LI Weiqiang;ZHANG Yue;LEI Chenlu(Institute of Land and Resources Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650000,China;Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;Jiangsu Donghai Continental Deep Hole Crustal Activity,National Observation and Research Station,Lianyungang,Jiangsu 222000,China;Exploration and Development Technology Research Institute,Yanchang Oil Field Co.Ltd,Yan'an,Shaanxi 716000,China)
机构地区:[1]昆明理工大学国土资源工程学院,云南昆明650000 [2]中国地质科学院地质研究所,北京100037 [3]江苏东海大陆深壳活动国家野外科学观测研究站,江苏连云港222000 [4]延长油田股份有限公司勘探开发技术研究中心,陕西延安716000
出 处:《地质学报》2024年第10期3047-3061,共15页Acta Geologica Sinica
基 金:国家自然科学基金项目(编号42174123,41941016)资助的成果。
摘 要:西藏波密地区位于南迦巴瓦构造结东北部,是研究喜马拉雅东构造结演化的关键地区。本文首次获得波密地区1:20万布格重力数据,并利用小波变换多尺度分解方法、刻痕分析方法和重力三维反演方法,获得了不同尺度的重力异常、断层分布和密度结构。结果分析表明,波密地区整体地壳密度变化明显,与断裂分布密切相关。同时结合区域地质资料,在波密地区推断了20条断裂,发现了4处较大的横向密度不均匀带,并推断了贯穿研究区的嘉黎断裂带的产状。在此基础上利用该地区地震及余震活动记录,本文分析了深部密度结构与地震的关系。通过对研究区的断裂构造、地震活动与重力异常的密度横向变化可知,该地区地震活动、断裂带与岩石密度扰动的横向不均匀性密切相关,地震主要位于密度差异带整体的垂向的高密度区域。最后讨论了深部密度结构对波密地区大型工程建设的潜在影响。The Bomi region of Tibet is located in the northeast of the Namche Barwa Syntaxis.It is a key area for studying the evolution of eastern Himalayas syntaxis.This study obtained 1200000 Bouguer gravity data in Bomi region for the first time.First,using the wavelet transform multi-scale decomposition method,scratch analysis method and gravity 3D inversion method to divide the tectonic activity unit,we obtained the gravity anomalies of different,faults distribution and density structures.The analysis results show that the overall crust density in the Bomi region changes significantly and is closely related to the fault distribution.At the same time,combined with the regional geological data and our inferred 20 faults in the Bomi area,we found 4 large transverse density uneven zones and deduced the occurrence of Jiali fault zone which runs through the study area.In addition,using the seismic and aftershock activity records in the area,we analyzed the relationship between deep density structure and earthquakes.Finally,according to the transverse variation of fault structure density,seismic activity and gravity anomaly in the study area,it can be seen that the seismic,fault zone and rock density disturbance are closely related to the transverse unevenness,and the earthquakes are mainly located in the overall vertical high-density area of the density difference zone.Based on the above analysis,we discuss the potential influence of deep density structure on large-scale engineering construction in Bomi area.
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