Partial self-reversal in basalts containing mildly low-temperature oxidized titanomagnetite

Details Partial self-reversal in basalts containing mildly low-temperature oxidized titanomagnetite Partial self-reversal in basalts containing mildly low-temperature oxidized titanomagnetite

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...30..357h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 30, Issue 4, p. 357-357.

Physics

5

Scientific paper

Oligocene basalt samples, cored from Yarraman Creek in the Liverpool Range, New South Wales, Australia, have been found to contain two remanence components with opposing directions. The self-reversed component has been clearly identified in several samples subjected to detailed thermal demagnetization. Moreover, through AF demagnetization results alone, some unheated specimens display consistent multicomponent behavior.
Several flows under investigation were extruded during what appears to have been an excursion of the geomagnetic field, each possessing a magnetization direction far from the full polarity state. The possibility that the self-reversed moments are simply secondary components, acquired in an opposing field direction is, therefore, ruled out.
Optical examinations and thermomagnetic curves indicate that the samples contain from nearly unoxidized, to moderately low-temperature oxidized, titanomagnetite. The self-reversed component is most clearly removed during thermal demagnetization between about 230 and 290°C, above the observed Curie point of the titanomagnetite, and is believed to be associated with titanomaghemite. Consistently, the role of the self-reversed moment is seen to be most dramatic in samples showing the highest degree of low-temperature oxidation. Moreover, thermal demagnetization of samples from varying depths below the creek bed provide strong evidence that the self-reversed component in some, if not all, of the samples investigated develops at room temperature. The relevant self-reversal mechanism is currently under investigation.

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