深地震反射剖面揭示的西藏娘热矿集区上地壳结构  

Upper Crustal Structure of Tibetan Niangre Ore Concentration Area Revealed by Deep Seismic Reflection Profile

作　　者：徐泰然 卢占武[1,2] 王海燕[1,2] 李洪强[1,2] 李文辉[1,2] Xu Tairan;Lu Zhanwu;Wang Haiyan;Li Hongqiang;Li Wenhui(Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Earthprobe and Geodynamics, Ministry of Land and Resources, Beijing, 100037, China)

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]国土资源部深部探测与地球动力学重点实验室,北京100037

出　　处：《吉林大学学报（地球科学版）》2018年第2期556-565,共10页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41574091;41430213;41590863);国家重点研发计划项目(2016YFC0600301)~~

摘　　要：深地震反射技术是探测大型成矿带和矿集区深部结构、揭示成矿背景的重要方法。西藏娘热矿集区位于冈底斯成矿带中段,拥有众多铁、铜等多金属矿床。本文通过对其附近的岩浆流体通道等地下结构进行探索,揭示成矿与断裂形成的相辅相成过程。布设了横过矿集区130km长的深地震反射剖面并进行了层析静校正、去噪、预测反褶积等数据处理,获得了娘热矿集区上地壳结构的反射图像。结合本区地质、地球物理资料,对矿集区上地壳结构进行了研究,指出:区域内存在的7条断裂与冈底斯成矿带矿脉分布具有一定的空间关系;一些如亮点构造的特殊现象控制了岩浆活动的上升通道,与矿床接触关系密切,具有研究价值。Deep seismic reflection technology is an important method to detect the deep structure of large-scale metallogenic belt and ore concentration area and reveal the background of mineralization.The authors explored the subsurface structure of the magmatic fluid passage in the vicinity of the Tibetan Niangre ore concentration area with iron,copper and other polymetallic deposits in the middle section of the Gangdese metallogenic belt,revealed the background of the mineralization and the corresponding fracture formation.Through the data processing such as tomostatics,de-noising,and predictive deconvolution of the130km deep seismic reflection profile crossing the Niangre ore concentration area,we obtained the reflected images of the upper crustal structure of the Niangre ore concentration area.Based on the geologic and geophysical data in this area,we studied the upper crustal structure of the ore concentration area,and found out the spatial relationship between the seven existing faults in the area and the distribution of the veins in the Gangdese metallogenic belt,and point out that some special structures such as the bright spot structure control the magma activity rising channel,and closely connected with the deposits.

关 键 词：深地震反射 娘热矿集区 上地壳 解释 冈底斯成矿带 

分 类 号：P631.4[天文地球—地质矿产勘探]