International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

PRELIMINARY RESULTS FROM ROCK MAGNETIC ANALYSES OF QUATERNARY AND TERTIARY BASALTS FROM THE GULF COAST OF MEXICO

Pages: 5 - 14

Authors: JOHN-PAUL J. POLLARD, GRAHAM J. SHERWOOD, HARALD BOHNEL

Abstract: As the foundation for a palaeomagnetic study of the Gulf Coast of Mexico, rock magnetic measurements were carried out on basaltic samples from 40 sites in the Gulf Coast region. Strong-field thermomagnetic and hysteresis techniques as well as room and low temperature susceptibility analyses were employed. These measurements show that the samples contain titanomagnetites with domain states from single- to multi-domain, with few superparamagnetic grains. Most samples have undergone at least partial deuteric oxidation though a significant quantity have not. The titanomagnetites have a range of compositions from Ti-poor to Ti-rich, where the latter appear to have endured varying degrees of maghematization.

Keywords: Mexico, Gulf Coast, basalts, rock magnetism

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