Abstract Identification of mafic dike swarms and LIPs (Large Igneous Provinces) are of vital importance in geologic history because they provide information on geodynamics, mantle geochemistry, and paleomagnetism. These data provide key information for paleogeographic reconstructions with the aid of barcode matches and precise radiometric ages. Considering such issues, the Brazilian Precambrian shield can be used as a case for refining the cartography of the relevant intraplate activity (e.g., dikes, sills, flood basalts) in space and time. This work presents an updated map of Brazilian mafic dike swarms produced from airborne geophysical maps (Series 1000 – Geological Survey of Brazil). Linear and strong anomalies found on aeromagnetic maps using First Vertical Derivative of the Magnetic Field and Amplitude of the Analytic Signal were mapped on a GIS platform. The obtained data were compared to ternary radiometric maps and geological maps, in order to exclude those that do not correspond to mafic dikes. The remaining structures - those believed to represent mafic dikes - were classified based on data compiled from the literature. The updated map exhibits more than 5000 elements, including dikes and magmatic suites, in which about 75% were geologically identified and divided into 60 dike swarms and 10 igneous suites and/or units. The dikes were grouped into sixteen extensional episodes from the Archean to the Cenozoic, although some are related to extension/transtension domains within regional compressive zones akin to orogenic settings. The most frequent records refer to the Proterozoic, representing intraplate episodes, some of them consistent with LIPs. The dataset also includes a large record of the Mesozoic age, which corresponds to major LIP events related to the opening of the Atlantic Ocean and the fragmentation of Gondwana.

中文翻译：

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基于机载地球物理数据的巴西基性岩脉群更新图

摘要 基性岩脉群和 LIPs（大型火成岩省）的识别在地质历史中具有至关重要的意义，因为它们提供了关于地球动力学、地幔地球化学和古地磁学的信息。这些数据借助条形码匹配和精确的辐射年龄为古地理重建提供了关键信息。考虑到这些问题，巴西前寒武纪地盾可以作为一个案例来完善相关板块内活动（例如，堤坝、窗台、洪水玄武岩）在空间和时间上的制图。这项工作展示了根据航空地球物理图（1000 系列 - 巴西地质调查局）生成的巴西镁铁质岩脉群的更新图。使用磁场的一阶垂直导数和分析信号的幅度在航空磁图上发现的线性和强烈异常被绘制在 GIS 平台上。将获得的数据与三元辐射图和地质图进行比较，以排除那些不符合基性岩脉的数据。其余的结构——那些被认为代表镁铁质岩脉的结构——根据文献汇编的数据进行了分类。更新后的地图展示了 5000 多个元素，包括岩脉和岩浆组，其中约 75% 被地质识别并分为 60 个岩脉群和 10 个火成岩组和/或单元。从太古宙到新生代，这些堤坝分为十六个伸展集，尽管有些与区域压缩带内类似于造山带的延伸/变形域有关。最常见的记录是指元古代，代表板内事件，其中一些与 LIP 一致。该数据集还包括中生代的大量记录，该记录对应于与大西洋开放和冈瓦纳大陆分裂相关的主要 LIP 事件。