Data for: Paleoenvironmental reconstruction of the semi-arid Argentine Chaco based on lake multiproxy records over the last six centuries

In this work we present the data of mineralogical, high resolution geochemical and palynological analyzes of core LY3.3 lake sediments of Laguna Yema. The mineralogical data, obtained by X-ray diffractometer, were mainly composed of variable proportions of quartz, clays (illite) and plagioclase (microcline and albite).
The geochemical series, obtained by X-ray fluorescence (XRF), showed tendencies towards significant levels of elements Al, Si, S, Ca, Br and Zr. Levels of Al, Si, and Zr, declined progressively towards the top of the core. Contrastingly, S, Ca and Br exhibited a gradual increase towards the top. This less evident trend also occurred for Sr.
The palynological data processing was carried out using standard palynological techniques for Quaternary pollen (Fægri and Iversen, 1989). The following groups were defined: Trees, Shrubs, Herbs, Aquatic and Spores. The Trees Group is composed of 9 types of pollen; the Shrubs Group is constituted of 7 pollen types; the Herbs Group is made up of 18 types of pollen; the Aquatic Group is made up of Alternanthera aquatica and Juncaginaceae pollen types; and the Spores Group is composed of Polypodium, Pteridophyta and 3 unidentified spore types

本研究呈现了拉古纳亚马湖LY3.3号湖底沉积物矿物学、高分辨率地球化学和孢粉学分析的资料。矿物学数据由X射线衍射仪获得，主要由石英、黏土（伊利石）和长石（微斜长石和钠长石）的变量比例组成。地球化学系列由X射线荧光（XRF）获得，显示出铝、硅、硫、钙、溴和锆等元素达到显著水平的趋势。铝、硅和锆的含量随着核心顶部逐渐下降。相反，硫、钙和溴的含量则呈现出向顶部逐渐上升的趋势。这种不太明显的趋势也出现在锶元素上。孢粉学数据处理采用适用于第四纪花粉的标准孢粉学技术（Fægri 和 Iversen，1989）。定义了以下组别：乔木、灌木、草本、水生和孢子。乔木组由9种花粉类型组成；灌木组由7种花粉类型构成；草本组由18种花粉类型组成；水生组由 Alternanthera aquatica 和 Juncaginaceae 花粉类型组成；孢子组由 Polypodium、Pteridophyta 和3种未鉴定孢子类型组成。