Sr isotopic ratios of ancient gypsic soils in Atacama Desert, northern Chile

Abstract: 87Sr/86Sr data for Upper Miocene to Pleistocene calcium sulfate soils in the Atacama Desert of northern Chile are provided. Some examples occur as relict soils and others are paleosols. At some locations, full vertical profiles were sampled, while at other locations samples were collected at only one or two depths within the ancient soil profile. The purpose of the Sr isotopic study is to determine the source of the salts that constitute the soil and to use the identification of ancient soils with marine aerosol influence as a paleoaltitude proxy. A total of 98 samples are reported for sites spanning ~330 km strike-parallel distance and elevations between 450 and 1850 m.a.s.l., within the Coastal Escarpment, Coastal Cordillera and Central Depression of northern Chile (18.7-21.8°S).

摘要：本数据集提供智利北部阿塔卡马沙漠晚中新世至更新世钙质硫酸盐土壤的87Sr/86Sr同位素比值数据。部分样品为残遗土壤，其余则为古土壤。部分采样点获取了完整的土壤垂直剖面，其余采样点仅在古土壤剖面的1至2个深度层级采集了样品。本锶同位素研究的核心目标为明确构成该类土壤的盐分来源，并通过识别受海洋气溶胶影响的古土壤，将其作为古海拔代用指标。本次研究共报道98件样品，采样点分布于智利北部（南纬18.7°~21.8°）的海岸陡崖、海岸山脉及中央坳陷区域内，沿构造走向延伸距离约330公里，海拔范围为450~1850米（m.a.s.l.）。