Li content and Li and Sr isotopic compositions of deep brines from wells DRC-01 and DDD-02, and core samples (sediments, and basement rocks) from core DDD-07 - Salar de Diablillos, Argentina@en

Sr isotopes (87Sr/86Sr), Li contents and Li isotopes (δ7Li) were determined in drill core samples (sediments and rocks) and fluid (brine) samples to a depth of 250 m, obtained from Salar de Diablillos (southern Puna in north-western Argentina). For clastic sediment samples, Nd isotope compositions (143Nd/144Nd) were also determined. The Central Andes of South America hosts the largest known lithium (Li) anomalies in a restricted area, but the primary lithium sources of the salar deposits and the mobilization process of lithium are still a matter of speculation. Chemical weathering at or near the surface and leaching in hydrothermal systems of the active magmatic arc are considered as the two main mechanisms of Li extraction from the source rock. The lithium, strontium and neodimium isotope composition of typical salar deposits offer insights into the processes on how Li brine deposits in Andean evaporites are formed.本数据集对取自阿根廷西北部普纳高原南部迪亚维利洛斯盐沼（Salar de Diablillos）、深度达250米的岩心样品（沉积物与岩石）及流体（卤水）样品开展了分析，测定了其中的锶同位素（87Sr/86Sr）、锂（Li）含量以及锂同位素（δ7Li）。针对碎屑沉积物样品，还额外测定了其钕同位素（143Nd/144Nd）组成。南美洲安第斯中部的局限区域内，赋存着全球已知规模最大的锂异常，但盐沼矿床的原生锂物源以及锂的迁移过程仍属学界推测的议题。地表及近地表的化学风化作用，与活动岩浆弧热液系统中的溶滤作用，被认为是从源岩中萃取锂的两大主要机制。典型盐沼矿床的锂、锶与钕同位素组成，可为解析安第斯蒸发岩中锂卤水矿床的形成过程提供关键依据。