Abstract A dataset with information on samples of gabbro, charnockite, gneiss, granite, basalt, and sandstone-derived iron lateritic duricrusts, concretions, nodules, and soils was analyzed to address the multi-element chemical composition, background values, scavenger trace elements in Fe oxyhydroxides, parent rock inheritance, and weathering effect on Pb isotopes. Tropical weathering causes high mass loss of SiO2, Ba, Rb, and Sr assigned to the mineral rock framework (quartz, feldspar, and mica). The aqua regia leaching indicates that part of these elements was probably accumulated in authigenic Al-phosphates minerals affecting their mobility in the lateritic terrains. There is a generally Sc and V high accumulation in the lateritic duricrusts with Fe oxyhydroxide mineral framework (goethite, hematite, and amorphous). Th, U, and Pb are also accumulated on the gabbro and granite-derived lateritic duricrusts, Cr on the basalt-derived ones, REE on the gabbro-derived ones, as well as Th and U low to high loss on gneiss-derived ones, thus allowing to track inheritance of parent rocks. The more refined geochemical information obtained from the Pb isotopes related to the Fe oxyhydroxides of the lateritic duricrusts, concretions and soils indicated changes according to the parent rocks since the gabbro-derived lateritic duricrust samples are more radiogenic while the gneiss and granite-derived ones are less radiogenic. The basalt and sandstone-derived lateritic duricrust samples maintain the radiogenic signature of the respective parent rocks. Although homogenization was expected, the mineral, the main and trace elements, and Pb isotope compositions produced by leaching and accumulation in the tropical regolith highlight the parent rock signature and a complex weathering process.

中文翻译：

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巴西亚马逊河西北部热带风化层地球化学足迹、铁形态和铅同位素的进展

摘要 分析了一个包含辉长岩、charnockite、片麻岩、花岗岩、玄武岩和砂岩衍生的铁红土硬壳、结核、结核和土壤样本信息的数据集，以解决多元素化学成分、背景值、清除剂微量元素Fe 羟基氧化物、母岩遗传和风化作用对 Pb 同位素的影响。热带风化导致分配给矿物岩石框架（石英、长石和云母）的 SiO2、Ba、Rb 和 Sr 的大量损失。王水浸出表明这些元素的一部分可能在自生铝磷酸盐矿物中积累，影响了它们在红土地形中的流动性。在具有氢氧化铁矿物骨架（针铁矿、赤铁矿和无定形）的红土硬壳中普遍存在 Sc 和 V 高积累。钍，U，Pb 也在辉长岩和花岗岩衍生的红土硬壳上积累，Cr 在玄武岩衍生上积累，REE 在辉长岩衍生上积累，以及 Th 和 U 在片麻岩衍生上的损失从低到高，从而允许跟踪母岩的继承。从与红土硬壳、结核和土壤的 Fe 羟基氧化物相关的 Pb 同位素获得的更精细的地球化学信息表明根据母岩的变化，因为辉长岩衍生的红土硬壳样品具有更强的放射成因，而片麻岩和花岗岩衍生的样品具有更高的放射成因。较少的放射源。玄武岩和砂岩衍生的红土硬壳样品保持了各自母岩的放射特征。尽管预期均匀化，但矿物质、主要元素和微量元素、