Abstract:
We present a novel technique for quantitative unmixing of primary and secondary ferrimagnetic minerals in sediments. Hysteresis and high-resolution first-order reversal curve (FORC) measurements are performed on sediment samples before and after digestion in a citrate-bicarbonate-dithionite (CBD) solution optimized for maximum selective extraction of secondary fine-grained iron oxides. The difference between magnetic measurements of untreated and CBD-treated sample materials is used to calculate the original magnetic signature of CBD-extractable minerals. A combination of selective chemical extraction and magnetic measurements suited for the detection of single-domain particles provides a cross-check between chemical and magnetic unmixing of primary and secondary iron oxides and resolves the non-uniqueness problem of numerical unmixing methods. A quantitative magnetic characterization of secondary ferrimagnetic minerals in a magnetofossil-rich pelagic carbonate is presented for the first time. It can be used for calibration of recently developed fast magnetic unmixing techniques. CBD-based Fe extraction from sediments with minimal clastic and/or aeolian inputs, such as pelagic carbonates, is particularly suited for the search for cosmogenic 60Fe signatures from supernova explosions, because 60Fe dilution by dissolved primary Fe-bearing minerals is minimized. © 2013 Elsevier B.V.
Registro:
Documento: |
Artículo
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Título: | Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques |
Autor: | Ludwig, P.; Egli, R.; Bishop, S.; Chernenko, V.; Frederichs, T.; Rugel, G.; Merchel, S.; Orgeira, M.J. |
Filiación: | Physik Department, Technische Universität München, 85748 Garching, Germany Geomagnetism and Gravimetry, Central Institute for Meteorology and Geodynamics, 1190 Vienna, Austria Department of Geosciences, Universität Bremen, 28359 Bremen, Germany Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany Department of Geological Sciences, FCEyN University of Buenos Aires, and CONICET, Argentina
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Palabras clave: | Citrate-bicarbonate-dithionite extraction; First-order reversal curve; Magnetotactic bacteria and magnetofossils; Pelagic carbonates; Primary and secondary magnetic minerals; Supernova explosion signatures; First-order reversal curves; Magnetic minerals; Magnetotactic Bacteria; Pelagic carbonates; Supernova explosion; Chemical detection; Extraction; Iron oxides; Magnetic hysteresis; Magnetic variables measurement; Magnetism; Minerals; Numerical methods; Submarine geology; Sediments; bacterium; bicarbonate; carbonate; dilution; explosion; iron oxide; magnetite; measurement method; mineral; optimization; quantitative analysis; sediment analysis; sediment chemistry; Bacteria (microorganisms) |
Año: | 2013
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Volumen: | 110
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Página de inicio: | 321
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Página de fin: | 339
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DOI: |
http://dx.doi.org/10.1016/j.gloplacha.2013.08.018 |
Título revista: | Global and Planetary Change
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Título revista abreviado: | Global Planet. Change
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ISSN: | 09218181
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CODEN: | GPCHE
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09218181_v110_n_p321_Ludwig |
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Citas:
---------- APA ----------
Ludwig, P., Egli, R., Bishop, S., Chernenko, V., Frederichs, T., Rugel, G., Merchel, S.,..., Orgeira, M.J.
(2013)
. Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques. Global and Planetary Change, 110, 321-339.
http://dx.doi.org/10.1016/j.gloplacha.2013.08.018---------- CHICAGO ----------
Ludwig, P., Egli, R., Bishop, S., Chernenko, V., Frederichs, T., Rugel, G., et al.
"Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques"
. Global and Planetary Change 110
(2013) : 321-339.
http://dx.doi.org/10.1016/j.gloplacha.2013.08.018---------- MLA ----------
Ludwig, P., Egli, R., Bishop, S., Chernenko, V., Frederichs, T., Rugel, G., et al.
"Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques"
. Global and Planetary Change, vol. 110, 2013, pp. 321-339.
http://dx.doi.org/10.1016/j.gloplacha.2013.08.018---------- VANCOUVER ----------
Ludwig, P., Egli, R., Bishop, S., Chernenko, V., Frederichs, T., Rugel, G., et al. Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques. Global Planet. Change. 2013;110:321-339.
http://dx.doi.org/10.1016/j.gloplacha.2013.08.018