Mathematics – Logic
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..98..340w&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 98, no. 3-4, June 1990, p. 340-359. Research supported by Clemson Uni
Mathematics
Logic
1
Magnetic Anomalies, Olivine, Petrology, Rock Intrusions, Iron Compounds, Microstructure, Mineralogy, South Carolina, Titanium Oxides
Scientific paper
The oxide mineralogy and the magnetic behavior of 15 olivine-normative samples obtained from South-Caroline diabase dikes were investigated using electron microprobe and SEM analyses and measurements of natural remanence magnetization (NRM), saturation isothermal remanence magnetization (SIRM), and anhysteritic remanence magnetization. It was found that chromite (which for these olivine-normative diabases is a sensitive petrologic indicator) constitutes up to 0.5 vol pct and that its abundance and composition correlate with bulk rock Cr. Microscopic analyses showed that titanomagnetite compositions were mostly between 0.4 and 0.55. The values of NRM and the NRM/SIRM ratios varied between 4 and 0.01 A sq m/kg and 0.0019 and 0.032, respectively. These properties inversely correlate with Cr content and demonstrably contrast Cr-rich and Cr-poor samples.
Warner Richard D.
Wasilewski Peter J.
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