Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island
Por:
Chaparro, Marcos A. E., Chaparro, Mauro A. E., Córdoba F.E., Lecomte K.L., Gargiulo J.D., Barrios A.M., Urán G.M., Manograsso Czalbowski N.T., Lavat A., Böhnel H.N.
Publicada:
1 oct 2017
Resumen:
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 (<0.1 µm). Magnetic parameters and non-magnetic variables analysed by multivariate statistics reveal significant differences between silt facies (e.g. mass-specific susceptibility ?=109.6×10-8 m3 kg-1, remanent coercivity Hcr=49.2 mT and total organic carbon (TOC)=1.11%) and sand facies (e.g. ?=82.1×10-8 m3 kg-1, Hcr=44.7 mT and TOC=0.70%), and four recent depositional sub-environments were identified and characterized in Lake Anónima. This multiparameter analysis contributes to the understanding of present-day lacustrine dynamic and sedimentary processes. Lake Anónima may provide a useful analogue for the interpretation of other lacustrine basins in the Antarctic region. © Antarctic Science Ltd 2017.
Filiaciones:
Chaparro, Marcos A. E.:
UNCPBA, CONICET, Ctr Prov Buenos Aires, Ctr Invest Fis & Ingn,CIFICEN, Pinto 399, Tandil 7000, Australia
Chaparro, Mauro A. E.:
Consejo Nacl Invest Cient & Tecn, UNMDP, Fac Ciencias Exactas & Nat, Ctr Marplatense Invest Matemat CEMIM, Mar Del Plata, Buenos Aires, Argentina
Córdoba F.E.:
Univ Nacl Jujuy, CONICET, Inst Geol & Mineria, Inst Ecorreg Andinas INECOA, Av Bolivia 1661, RA-4600 San Salvador De Jujuy, Argentina
Instituto de Ecorregiones Andinas (INECOA), Universidad Nacional de Jujuy-CONICET, Instituto de Geología y Minería, Av. Bolivia 1661, San Salvador de Jujuy, 4600, Argentina
Lecomte K.L.:
Consejo Nacl Invest Cient & Tecn, Ctr Invest Ciencias Tierra CICTERRA, Av Velez Sarsfield 1611,X5016GCA, Cordoba, Argentina
Univ Nacl Cordoba, Fac Ciencias Exactas Fis & Nat, Av Velez Sarsfield 1611,X5016CGA, Cordoba, Argentina
Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), CONICET, Av. Vélez Sarsfield 1611, Córdoba, X5016GCA, Argentina
Universidad Nacional de Córdoba, Facultad de Ciencias Exactas Físicas y Naturales, Av. Vélez Sarsfield 1611, Córdoba, X5016CGA, Argentina
Gargiulo J.D.:
UNCPBA, CONICET, Ctr Prov Buenos Aires, Ctr Invest Fis & Ingn,CIFICEN, Pinto 399, Tandil 7000, Australia
Centro de Investigaciones en Fisica e Ingenieria Del Centro de la Provincia de Buenos Aires, Pinto 399, Tandil, 7000, Argentina
Barrios A.M.:
Univ Granada, Av Hosp S-N, Granada 18010, Spain
Universidad de Granada, Av. del Hospicio s/n, Granada, 18010, Spain
Urán G.M.:
Univ Nacl Cordoba, Fac Ciencias Exactas Fis & Nat, Av Velez Sarsfield 1611,X5016CGA, Cordoba, Argentina
Universidad Nacional de Córdoba, Facultad de Ciencias Exactas Físicas y Naturales, Av. Vélez Sarsfield 1611, Córdoba, X5016CGA, Argentina
Manograsso Czalbowski N.T.:
IAA, 25 Mayo 1143, San Martin, Buenos Aires, Argentina
Instituto Antártico Argentino (IAA), 25 De Mayo 1143, San Martín, Provincia de Buenos Aires, Argentina
Lavat A.:
UNCPBA, CONICET, Ctr Prov Buenos Aires, Ctr Invest Fis & Ingn,CIFICEN, Olavarria, Argentina
Centro de Investigaciones en Fisica e Ingenieria Del Centro de la Provincia de Buenos Aires, Olavarría, Argentina
Böhnel H.N.:
Centro de Geociencias (UNAM), Blvd. Juriquilla 3001, Querétaro, 76230, Mexico
UNAM, Ctr Geociencias, Blvd Juriquilla 3001, Queretaro 76230, Mexico
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