利用航磁资料研究新疆西天山阿吾拉勒地区古火山口分布  

Distribution of ancient volcanic craters of Awulale region interpretated from aeromagnetic data in western Tianshan mountains Xinjiang

作　　者：张楠 鲁宝亮[1] 张超 王万银[1] 

机构地区：[1]长安大学重磁方法技术研究所,长安大学地质工程与测绘学院,长安大学西部矿产资源与地质工程教育部重点实验室,西安710054

出　　处：《地球物理学进展》2016年第3期1033-1039,共7页Progress in Geophysics

基　　金：中央高校基本科研业务费专项资金(2014G3262010;310826163301);长安大学基础研究支持计划专项基金;中国地质调查局地质矿产评价专项(12120114007501;12120113044000)联合资助

摘　　要：新疆西天山阿吾拉勒地区是我国重要的多金属成矿带,该地区矿产富集与石炭纪火山活动存在着密切的关系.因此,利用航磁资料研究新疆西天山阿吾拉勒地区古火山口的位置,为进一步划分成矿远景区及缩小找矿范围提供地球物理支撑.本文采用"由已知到未知"的研究思想,以智博古火山口为研究对象,利用化极磁力异常及其归一化总水平导数垂向导数(NVDR_THDR)特征及相关地质资料,总结出新疆西天山阿吾拉勒地区古火山口的航磁异常识别标志.研究表明,化极磁力异常NVDR_THDR环状极大值异常带为古火山口的主要识别标志.结合化极磁力异常和卫星遥感影像共推断出古火山口6处,其长短轴比介于1.15至3.00之间,整体走向呈NWW向.外业考察已初步证实了3处古火山口的存在,并在推断的古火山口内部已发现磁铁矿化.因此,本文利用航磁资料识别的西天山阿吾拉勒地区古火山口位置具有较高的可信度.Awulale region located in Western Tianshan Mountains Xinjiang is an important polymetallic metallogenic belt in China,the Carboniferous volcanic activity is closely related to ore deposits. The research of locations of ancient volcanic craters of Awulale region by using aeromagnetic data can provides geophysical evidence for delimiting metallogenic prospective provinces and reducing prospective areas. The paper uses analogy method from known to unknown and focuses on Zhibo ancient volcanic craters, then Summarize identification marks of ancient volcanoes of Awulale region by using the characteristics of RTP magnetic anomaly vertical derivative of the total horizontal derivative（ NVDR THDR） and related geological data. The research shows that the ring-shaped anomaly in the RTP magnetic anomaly NVDR THDR is an important identification mark. Combing with RTP anomaly and satellite image,the paper deduced six ancient volcanic craters,the major axis and minor axis of ancient volcanic craters lies between 1.15-3. 00. the major axis stroke in NWW mainly. According to field survey result,two ancient volcanic craters have been confirmed preliminarily and magnetite have been found. So the results of deduced ancient volcanic craters by using aeromagnetic data has high credibility.

关 键 词：西天山 NVDR_THDR方法 航磁资料 古火山口 

分 类 号：P318[天文地球—固体地球物理学] P631[天文地球—地球物理学]