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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.
The Uttar Pradesh region in western Tianshan of Xinjiang is an important polymetallic metallogenic belt in China, and the mineral enrichment in this area is closely related to the Carboniferous volcanic activity. Therefore, the use of aeromagnetic data to study the ancient crater of the Awulal area in the western Tianshan, Xinjiang And provide geophysical support for the further division of the ore prospect area and the reduction of the prospecting range.This paper adopts the research thought of “from known to unknown”, taking the ancient Paleo crater as the research object, And its normalized derivative of vertical derivative (NVDR_THDR) and related geological data, the aeromagnetic anomaly identification mark of the ancient crater in the Awulalar area of the western Tianshan Mountains is summarized.The results show that the anomalous NVDR_THDR The value anomalous zone is the main identification sign of the ancient crater. Combined with the polar anomaly and the satellite remote sensing images, 6 ancient crater areas were deduced, the long-to-short axis ratio ranged from 1.15 to 3.00, and NWW was the overall trend. The investigation has initially confirmed the existence of three ancient crater and the magnetite mineralization has been found in the inferred ancient crater.Therefore, this paper uses the ancient magnetic fire Opening position having a high credibility.