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Tectonic insights of the southwest Amazon Craton from geophysical, geochemical and mineralogical data of Figueira Branca mafic-ultramafic suite, Brazil

机译：从巴西菲盖拉·布兰卡镁铁质-超音波组的地球物理，地球化学和矿物学数据对西南亚马逊克拉通的构造见解

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摘要

The Figueira Branca Suite is a layered mafic-ultramafic complex in the Jauru Terrane, southwest Amazon Craton. New lithological, geochemical, gamma-ray and potential field data, integrated with geological, isotope and paleomagnetic data are used to characterize this pulse of Mesoproterozoic extension-related magmatism. The Figueira Branca Suite formed through juvenile magma emplacement into the crust at 1425 Ma, coeval with the later stages of the Santa Helena Orogen. Gabbros and peridotite-gabbros display increasing enrichment of LREE, interpreted as evidence of progressive fractionation of the magma. Magnetic and gamma-ray data delimit the extent of magmatism within the suite to four bodies to the north of Indiavaí city. Modelling gravity and magnetic field data indicate that the anomalous sources are close to the surface or outcropping. These intrusions trend northwest over 8 km, with significant remanent magnetization that is consistent with published direction obtained through paleomagnetic data. The emplacement, mineralogy and geochemical signature point towards a back-arc extension tectonic framework in the later stages of the Santa Helena Orogen.
机译：Figueira Branca Suite是位于亚马逊西南部Craton西南部Jauru Terrane的多层铁磁-超音波复合体。新的岩性，地球化学，伽马射线和势场数据与地质，同位素和古磁性数据相结合，用于表征中元古代伸展相关岩浆作用的脉冲。菲盖拉布兰卡套房是在1425 Ma时通过少年岩浆进入地壳而形成的，与圣海伦娜造山带的后期相近。辉长岩和橄榄岩辉长岩显示出对LREE的富集增加，这被解释为岩浆逐渐分级的证据。磁和伽马射线数据将套间内的岩浆作用范围界定为印度瓦伊城以北的四个天体。对重力和磁场数据的建模表明异常源靠近地面或露头。这些侵入向西北方向延伸超过8 km，剩余磁化强度很大，这与通过古磁数据获得的方向一致。位置，矿物学和地球化学特征指向圣海伦娜造山带后期的弧后伸展构造框架。

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