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

Published: 1 April 2019| Version 1 | DOI: 10.17632/hnzbyhj785.1
Contributors:
Flavio Cesar Speranza,
Liliana Concepción Lupo,
Julio José Kulemeyer,
Bernat Claramunt Lopez,
Santiago Giralt,
Angie Pereira

Description

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

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