期刊
GLOBAL AND PLANETARY CHANGE
卷 110, 期 -, 页码 321-339出版社
ELSEVIER
DOI: 10.1016/j.gloplacha.2013.08.018
关键词
magnetotactic bacteria and magnetofossils; pelagic carbonates; primary and secondary magnetic minerals; citrate-bicarbonate-dithionite extraction; first-order reversal curve; supernova explosion signatures
资金
- German Research Foundation [DFG-Bi1492/1-1]
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 Fe-60 signatures from supernova explosions, because Fe-60 dilution by dissolved primary Fe-bearing minerals is minimized. (C) 2013 Elsevier B.V. All rights reserved.
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