Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island

CHAPARRO, MARCOS A.E.; CHAPARRO, MAURO A.E.; CÓRDOBA, FRANCISCO E.; LECOMTE, KARINA L.; GARGIULO, JOSÉ D.; BARRIOS, ANA M.; URÁN, GIMENA M.; MANOGRASSO CZALBOWSKI, NADIA T.; LAVAT, ARACELI; BÖHNEL, HARALD N.

ANTARCTIC SCIENCE

CAMBRIDGE UNIV PRESS

Año: 2017 vol. 29 p. 429 - 444

0954-1020

During the summer Lake Anónima experiences important changes in salinity and lake level fluctuations. Physicochemical data and field observations indicate that evaporative processes are dominant and that the water inflow is mainly provided by snow meltwater and streams. A multiproxy analysis of data from lake bottom sediments suggests that the main surface stream located south-west of the lake controls the clastic input and the spatial variation of sediment composition. Through an integrated analysis (magnetic, X-ray diffraction and Fourier transform infrared spectroscopy studies) magnetite and greigite minerals were identified in these lake sediments. Such ferrimagnetic minerals have ultra-fine grain sizes (