DOI: 10.1016/j.gloplacha.2013.08.018
论文题名: Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques
作者: Ludwig P. ; Egli R. ; Bishop S. ; Chernenko V. ; Frederichs T. ; Rugel G. ; Merchel S. ; Orgeira M.J.
刊名: Global and Planetary Change
ISSN: 0921-8228
出版年: 2013
卷: 110 起始页码: 321
结束页码: 339
语种: 英语
英文关键词: Citrate-bicarbonate-dithionite extraction
; First-order reversal curve
; Magnetotactic bacteria and magnetofossils
; Pelagic carbonates
; Primary and secondary magnetic minerals
; Supernova explosion signatures
Scopus关键词: 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)
英文摘要: 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. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888839097&doi=10.1016%2fj.gloplacha.2013.08.018&partnerID=40&md5=04408c78d884d0abdd32f7050cfa0f8f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11134
Appears in Collections: 全球变化的国际研究计划
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作者单位: Physik Department, Technische Universität München, 85748 Garching, Germany
Recommended Citation:
Ludwig P.,Egli R.,Bishop S.,et al. Characterization of primary and secondary magnetite in marine sediment by combining chemical and magnetic unmixing techniques[J]. Global and Planetary Change,2013-01-01,110.