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Artículo

Magnetic studies of river sediments and its variation with different physiographic regions of Bharathapuzha River, southwestern India

Chaparro, Marcos Adrián EduardoIcon ; Krishnamoorthy, Nanjundan; Chaparro, Mauro Alejandro EduardoIcon ; Lecomte, Karina LeticiaIcon ; Mullainathan, Sundaram; Mehra, Rohit; Sinito, Ana MariaIcon
Fecha de publicación: 03/2015
Editorial: Springer
Revista: Studia Geophysica Et Geodaetica
ISSN: 0039-3169
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ciencias Medioambientales

Resumen

Bharathapuzha River is the second longest river in southwest India, where three physiographic regions show a distinctive spatial variation and their bed sediments can be considered environmental hosts for end-products generated by human activities and natural radionuclide components. Thus, the study of this river sediments in SW India is important not only because they are recorders of adverse human impacts (e.g., intense agricultural activities and urban pollution), but also because of their potential health hazards due to their common use as construction materials. Magnetic (e.g., magnetic susceptibility, anhysteretic remanent magnetisation and isothermal remanent magnetisation), radionuclide (226Ra, 232Th and 40K) and chemical (trace and major elements) measurements were carried out in bed sediment samples along 33 sites from the uppermost catchment downstream. Magnetic measurements show the dominance of ferrimagnetic minerals; their concentration ranges widely along the river and between regions, showing up to 7-fold higher values for concentration-dependent magnetic parameters, e.g., mean values of saturation of isothermal remanent magnetisation acquisition are 67.9 and 9.4 × 10-3 Am2 kg-1 for highland and lowland regions, respectively. Multivariate statistical analyses show the existence of relationships between magnetic, radioactivity and chemical variables. In particular, magnetic concentrationdependent parameters are significantly correlated with radioactivity variables 40K and 226Ra (with concentrations about 20% higher than the worldwide mean values), as well as with some elements: Fe, Ca and P. Such analyses also show differences between physiographic regions where samples from the highland (and lowland) region are well grouped showing higher (lower) magnetic concentrations and lower (higher) coercivity minerals. The spatial variation of magnetic parameters along the river can be related to the influence of both natural sources and human activities, i.e. urbanisation and intense agricultural activities. In this sense, environmental magnetism data provide very useful tools to investigate adverse human activities occurring in the riverine environment.
Palabras clave: Magnetic Parameters , Major And Trace Elements , Multivariate Statisticals Studies
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/7588
URL: http://link.springer.com/article/10.1007/s11200-014-0145-6
DOI: http://dx.doi.org/10.1007/s11200-014-0145-6
Colecciones
Articulos(CICTERRA)
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Articulos(CIFICEN)
Articulos de CENTRO DE INV. EN FISICA E INGENIERIA DEL CENTRO DE LA PCIA. DE BS. AS.
Citación
Chaparro, Marcos Adrián Eduardo; Krishnamoorthy, Nanjundan; Chaparro, Mauro Alejandro Eduardo; Lecomte, Karina Leticia; Mullainathan, Sundaram; et al.; Magnetic studies of river sediments and its variation with different physiographic regions of Bharathapuzha River, southwestern India; Springer; Studia Geophysica Et Geodaetica; 59; 3; 3-2015; 438–460
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