Thermomagnetic characteristics in late orogenic granites and gneisses of the southern Appalachian Piedmont

Details Thermomagnetic characteristics in late orogenic granites and gneisses of the southern Appalachian Piedmont Thermomagnetic characteristics in late orogenic granites and gneisses of the southern Appalachian Piedmont

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..117d&link_type=abstract

Earth and Planetary Science Letters, Volume 64, Issue 1, p. 117-122.

Physics

Scientific paper

Thermomagnetic curves have been obtained for samples from 25 granites and gneisses in Georgia, South Carolina, and North Carolina. This data set can be divided into two distinct curve types: Type I includes rocks which exhibit no distinct Curie points and a linear decrease in magnetization with increasing temperature; Type II curves exhibit a distinct Curie point over a range of temperatures expected for magnetite (500-580°C). Synthetic samples constructed from magnetite and hematite powder exhibit Type I behavior when the hematite to magnetite ratio is high (e.g. 15 : 1). Examination of polished sections shows relatively coarse-grained magnetite only in Type II rocks. We interpret our data to indicate that Type I thermomagnetic curves are dominated by relatively large hematite/magnetite ratios while Type II granites are characterized by relatively coarse-grained magnetite. Type I granite samples have low magnetic susceptibility values (less than 4 × 10-4 cgs) while most Type II granite samples have higher values. The Type I granites are invariably 18O-enriched whereas Type II granites typically exhibit low 18O/16O ratios. These relationships are consistent with previously reported correlations of susceptibility (generally indicative of magnetite content) and oxygen isotopic trends in the southern Appalachian Piedmont.

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