Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques
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) so...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09218181_v110_n_p321_Ludwig http://hdl.handle.net/20.500.12110/paper_09218181_v110_n_p321_Ludwig |
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paper:paper_09218181_v110_n_p321_Ludwig2023-06-08T15:50:49Z Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques Orgeira, María Julia 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) 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. Fil:Orgeira, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09218181_v110_n_p321_Ludwig http://hdl.handle.net/20.500.12110/paper_09218181_v110_n_p321_Ludwig |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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) |
| spellingShingle |
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) Orgeira, María Julia Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques |
| topic_facet |
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) |
| description |
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. |
| author |
Orgeira, María Julia |
| author_facet |
Orgeira, María Julia |
| author_sort |
Orgeira, María Julia |
| title |
Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques |
| title_short |
Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques |
| title_full |
Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques |
| title_fullStr |
Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques |
| title_full_unstemmed |
Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques |
| title_sort |
characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques |
| publishDate |
2013 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09218181_v110_n_p321_Ludwig http://hdl.handle.net/20.500.12110/paper_09218181_v110_n_p321_Ludwig |
| work_keys_str_mv |
AT orgeiramariajulia characterizationofprimaryandsecondarymagnetiteinmarinesedimentbycombiningchemicalandmagneticunmixingtechniques |
| _version_ |
1768542275107815424 |