Neodymium (Nd) and strontium (Sr) isotopic signatures in marine sediments reflect the geology of the associated drainage basin from which those sediments are supplied. These signatures are significantly affected by relief, weathering, transport, and deposition of sedimentary contributions from the respective sources. This work makes available new data of SrNd isotope ratios and Rare Earth Element (REE) concentrations, which provides a record of the sedimentary provenance of marine sediment supplied to the continental slope off the coast of northeastern Brazil since the last 130 thousand years. Our results indicate the main source of sediments to this site was the Parnaíba sedimentary basin. Furthermore, the fluctuations in Fe/K, Al/Si ratios, and Sr values are explained by geochemical processes operating within the region, which likely reflects changes in the hydrological regime and relative sea-level, and intensity of weathering in continental rocks in glacial-interglacial timescales. We suggest that low values of ⁸⁷Sr/⁸⁶Sr ratios during glacial are a result of dry conditions. Also, minor fluctuations within the last glacial period may be a consequence of displacements of the Intertropical Convergence Zone (ITCZ). Such displacements cause changes in rainfall and consequently variations in chemical weathering which affect Sr isotopic fractionation. During past humid intervals, the low Nd (non-radiogenic) signal observed could be explained as a process of penetration of rainwater into the deepest non-radiogenic sediment and subsequent replacement of the isotopic signal in the environment in glacial-interglacial timescales.

海洋沉积物中的钕（Nd）和锶（Sr）同位素特征反映了相关沉积盆地的地质情况。这些特征受到相应来源的沉积，沉积，风化，运输和沉积的显着影响。这项工作使Sr的新数据可用Nd同位素比率和稀土元素（REE）浓度，记录了自过去13万年来以来向巴西东北海岸外陆斜坡提供的海洋沉积物的沉积物来源。我们的结果表明，该地点的主要沉积物来源是帕尔纳巴沉积盆地。此外，Fe / K，Al / Si比和Sr值的波动是由该地区内发生的地球化学过程解释的，这很可能反映了水文状况和相对海平面的变化以及冰川中大陆岩石的风化强度-冰川间的时间尺度。我们建议低值⁸⁷ Sr / ⁸⁶冰川期的Sr比值是干燥条件的结果。同样，最后冰川期的微小波动可能是热带辐合带（ITCZ）位移的结果。这样的位移会引起降雨的变化，从而导致化学风化的变化，从而影响Sr同位素分馏。在过去的潮湿时间间隔内，观测到的低Nd（非辐射）信号可以解释为雨水渗透到最深的非辐射沉积物中，并随后在冰冰间时间尺度上替代了环境中的同位素信号的过程。