Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.168..921f&link_type=abstract
Geophysical Journal International, Volume 168, Issue 3, pp. 921-934.
Astronomy and Astrophysics
Astronomy
5
Dead Sea, Greigite, Israel, Lacustrine Sediments, Rock Magnetism, Ti-Magnetite
Scientific paper
Laminated evaporitic sediments from the Dead Sea, Israel, were subjected to detailed rock magnetic investigations including the analysis of laboratory induced magnetizations and high temperature runs of the saturation magnetization. Ti-magnetite and greigite were identified as the main magnetic carrier minerals. The variations in concentration, grain size and coercitivity depended parameters reflect the varying amount of greigite with respect to Ti-magnetite. Samples with a high greigite concentration are characterized by S-ratios close to 1 in combination with low JARM/JSIRM ratios. The results of a hierarchical agglomerative cluster analysis of the rock magnetic data presented in form of scatter plots allow for a qualitative identification of greigite-indicative parameters/parameter ratios and thus semi-quantitative estimation of the greigite content. The samples from the Dead Sea are distributed along a mixing line between the end members pure greigite and low Ti-magnetite. Determination of hysteresis parameters revealed that the greigite dominated samples show SD-behaviour whereas the Ti-magnetites plot in the PSD-range.
Frank Ute
Negendank Jörg F. W.
Nowaczyk Norbert R.
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