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Numerical unmixing of weakly and strongly magnetic minerals : examples with synthetic mixtures of magnetite and hematite

Title data

Liu, Pengfei ; Hirt, Ann M. ; Schüler, Dirk ; Uebe, René ; Zhu, Peimin ; Liu, Tianyou ; Zhang, Henglei:
Numerical unmixing of weakly and strongly magnetic minerals : examples with synthetic mixtures of magnetite and hematite.
In: Geophysical Journal International. Vol. 217 (2019) Issue 1 . - pp. 280-287.
ISSN 0956-540X
DOI: https://doi.org/10.1093/gji/ggz022

Official URL: Volltext

Abstract in another language

The characterization of magnetic minerals in rocks often uses methods that measure induced magnetization. When rocks, sediments or soils contain two magnetic phases, in which one has a high saturation magnetization (MS), for example magnetite, and the other a low MS, for example hematite, the induced magnetization will be dominated by the stronger phase. An earlier study by Frank and Nowaczyk has shown that even when magnetite makes up
<10 wt per cent of the ferromagnetic content, it will mask hematite. This makes identification of phases with low MS difficult to identify. We conduct a systematic study of synthetic mixtures of single domain magnetite and hematite with a broad spectrum of particle size, using hysteresis properties, acquisition of isothermal remanent magnetization (IRM) and first-order reversal curve distributions (FORC). Hysteresis parameters and FORC distributions do not vary significantly from the pure magnetite sample for hematite concentrations ≤90 wt per cent. IRM is not saturated for hematite concentration of 30 wt per cent or higher. Principle component analysis (PCA) of the processed FORCs, detects the presence of hematite for concentrations 70 wt per cent at the very least. Our results illustrate the difficulty in identifying hematite when it is found together with magnetite. IRM acquisition is the most sensitive method for identifying hematite when it occurs together with magnetite.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Magnetic properties; Magnetic mineralogy and petrology; Rock and mineral magnetism; Statistical methods
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Microbiology > Chair Microbiology - Univ.-Prof. Dr. Dirk Schüler
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Microbiology
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 570 Life sciences, biology
Date Deposited: 08 Apr 2019 08:22
Last Modified: 09 Apr 2019 07:26
URI: https://eref.uni-bayreuth.de/id/eprint/48568