Singular Value Decomposition(SVD) used to extract aero-magnetic anomalies related to Sn-W polymetallic mineralization in SE Yunnan, China
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摘要:
滇东南锡-钨多金属矿集区位于扬子陆块、华夏陆块及印支陆块的交汇处,区内分布一系列与晚白垩世大规模岩浆作用密切相关的锡、钨、铜、银、铅、锌多金属矿床。对滇东南1:200 000航磁数据化极处理后,应用奇异值分解(SVD)技术提取航磁数据中与锡-钨多金属矿化有关的深部地质结构和地质体特征分量。通过定义不同的滤波器,选择相应的特征分量进行重构,获得反映深部及浅层的地质结构和地质体空间分布的图像。研究表明:①研究区深部存在2种磁性特征的基底,即强磁性基底(哀牢山岩群、大红山岩群和瑶山岩群)和弱磁性基底(昆阳群和猛硐岩群);②与矿化密切相关的花岗岩体显示为环绕负磁异常发育正磁异常,环形正磁异常可能反映了接触交代矿化蚀变带的空间分布;③环绕负磁异常发育正磁异常区域是进一步找寻锡-钨多金属矿床的最佳靶区。
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关键词:
- 奇异值分解(SVD) /
- 航磁致矿异常 /
- 锡-钨多金属矿床 /
- 花岗岩体 /
- 滇东南
Abstract:The Sn-W polymetallic ore-concentrated area in SE Yunnan is located at the junction of the Cathaysian Massif, Yangtze Massif, and Indo-China Massif, where there are a series of Sn, W, Cu, Ag, Pb, Zn polymetallic deposits closely related to the Late Cretaceous magmatism.The Singular Value Decomposition(SVD) was applied to extract aero-magnetic anomaly components reflecting the deep geological structures and geological bodies associated with the Sn-W polymetallic deposits and mineralized granitic intrusives from the aero-magnetic data of the SE Yunnan district at a scale of 1:200 000.The results show that there are two metamorphic basements, one with strong magnetism(Dahongshan Group, Ailaoshan Group and Yaoshan Group), and the other with weak magnetism(Mengdong Group); granitoids closely related to W-Sn polymetallic mineralization in the study area shows a ring positive magnetic anomaly around a negative magnetic anomaly, which may reflect a contact skarnization zone around a granitic intrusion; and the ring positive magnetic anomalies around negative magnetic anomaly are the best targets for further exploration of Sn-W polymetallic deposits.
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图 1 滇东南锡-钨多金属矿集区地质矿产简图(据参考文献[16]修改)
Figure 1.
图 4 由第1特征值至第4特征值重构得到的滇东南磁异常分量图像(地层代号同图 2)
Figure 4.
图 5 由第5特征值至第13特征值重构得到的滇东南磁异常分量图像(地层代号同图 2)
Figure 5.
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