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首页> 外文期刊>Brazilian Journal of Geology >The role of airborne geophysics in the investigation of gold occurrences in the Itapetim Region, Borborema Province, Northeast Brazil
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The role of airborne geophysics in the investigation of gold occurrences in the Itapetim Region, Borborema Province, Northeast Brazil

机译：航空地球物理在巴西东北部Borborema省Itapetim地区金矿调查中的作用

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摘要

We present a combined analysis of airborne geophysical data (magnetics and gamma-ray spectrometry) and field aspects of Itapetim lode gold district region, aiming to identify structurally deformed and hydrothermally altered zones, which are suggestive of gold mineralized sectors. The main geophysical lineaments are oriented in the NE-SW and E-W directions and display a clear correlation with the major gold-bearing structures in the region. In the magnetic maps, the key pathfinder for gold occurrences is their association with strongly magnetized areas positioned along the Itapetim Shear Zone and outer contour of Teixeira Batholith. In the field, such structures are materialized in protomylonitic and mylonitic rocks that present evidence of ductile and brittle deformation, whereas kinematic criteria are suggestive of a transpressional tectonic regime. In addition, the main radiometric pattern is characterized by K enrichment, which is correlated with a hydrothermal mineral assemblage dominated by quartz, potassium feldspar, and tourmaline. Based on the obtained data integration, we produced an integrative map and located ten new target areas of possible gold mineralization, which is correlative to other well-known lode deposits in Northeast Brazil and Africa.
机译：我们对机载地球物理数据（磁学和伽马射线能谱法）和Itapetim矿床金矿区进行了现场分析，旨在确定结构变形和热液蚀变的区域，这些区域暗示着金矿化的区域。主要的地球物理层系指向NE-SW和E-W方向，并且与该地区的主要含金结构有着明显的相关性。在磁图中，金矿的主要探路者是它们与沿Itapetim剪切带和Teixeira岩基的外轮廓定位的强磁化区域的关联。在野外，这种结构在前次生质和长生硬质岩石中物化，这些岩石表现出韧性和脆性变形的证据，而运动学标准则暗示了超压构造形态。此外，主要的辐射模式以钾富集为特征，钾的富集与石英，钾长石和电气石为主的热液矿物组合有关。在获得的数据整合的基础上，我们绘制了综合地图，并找到了可能的金矿化的十个新目标区域，这与巴西东北部和非洲的其他著名矿床相关。

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