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首页> 外文期刊>Brazilian Journal of Geology >Integrating geological and airborne geophysical data to review the cartography of Rio Itanguá Batholith, Ara?uaí Orogen, Brazil
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Integrating geological and airborne geophysical data to review the cartography of Rio Itanguá Batholith, Ara?uaí Orogen, Brazil

机译：整合地质和航空地球物理数据，以审查巴西阿拉奥伊奥尔根的里奥伊塔瓜基罗斯基思的制图

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摘要

Rio Itanguá Batholith (RIB) is a plutonic body located in the Northern border of Guanh?es block, one of the various basement blocks reworked within the Ara?uaí orogen, Eastern Brazil. Although its existence is known since the beginning of the 20 th century, its tectonic history remains poorly understood. The RIB was mapped at 1:100,000 scale in the 1990s, before geophysical and satellite data became available. This work aims to re-evaluate the cartography of the RIB, as an initial step towards understanding its genesis and evolution. In order to do so, field and petrographic data, together with airborne gamma-ray spectrometry and magnetometry data, were integrated, resulting in a geologic map that shows different features from the previous maps produced in the area, such as the batholith division into two different petrographic and geophysical units; the presence of a mafic dike intruding the batholith rocks and the reduction in size of the batholith area. The magnetometric and gamma-spectrometric data proved to be important tools for geological mapping, and the substantial data obtained in the analysis of this tiny area points to the importance of re-evaluating older geological maps, taking geophysical data into account.
机译：RioItanguáBatholith（RIB）是位于关东群岛北部边界的深成岩体，该区域是巴西东部Ara？uaí造山带内经过改造的各种地下室区块之一。尽管它的存在自20世纪初以来就为人所知，但其构造历史仍知之甚少。在获得地球物理和卫星数据之前，1990年代RIB的比例为1：100,000。这项工作旨在重新评估RIB的制图技术，以此作为了解其起源和演变的第一步。为此，将野外和岩石学数据以及机载伽玛射线能谱和磁力计数据整合在一起，生成了一个地质地图，该地图显示出与该地区以前的地图不同的特征，例如将岩基分为两部分不同的岩石学和地球物理单位;镁铁岩堤侵入岩床岩中，岩床面积减小。磁力计和伽玛能谱数据被证明是进行地质测绘的重要工具，而在这一微小区域的分析中获得的大量数据表明，重新评估旧的地质图并考虑地球物理数据的重要性。

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