Evidence for deuteric magnetization in hydrothermally altered Mesozoic basaltic rocks from East Antarctica

Details Evidence for deuteric magnetization in hydrothermally altered Mesozoic basaltic rocks from East Antarctica Evidence for deuteric magnetization in hydrothermally altered Mesozoic basaltic rocks from East Antarctica

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...52..352l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 52, Issue 3-4, p. 352-364.

Physics

4

Scientific paper

Mesozoic basaltic lavas and dykes from Vestfjella, East Antarctica, are dominated by well-grouped, single-component palaeomagnetic directions of normal polarity. Reversed magnetizations, heavily overprinted by normal polarity components, were encountered in a few lava flows and dykes. Only thermal demagnetization was successful in separating tight distributions of reversed polarity directions, interpreted to represent a deuteric magnetization. The region has been exposed to regional hydrothermal alteration to the epidote/prehnite metamorphic facies (T ~ 300°C). Titanomagnetite grains in high-temperature oxidation classes II-III show alteration features typical for hydrothermally altered basalts; partial to complete replacement of both ilmenite and magnetite to sphene is common in the most altered rocks, which also exhibit varying degrees of decomposition of the opaque minerals. The lavas display two major, but distinctly different, thermomagnetic curves; the `kink' type, previously reported from rocks exposed to the epidote metamorphic facies, and curves dominated by a paramagnetic contribution defining a magnetite Curie point. It is concluded that the basalts have retained palaeomagnetic directions acquired during the deuteric cooling phase, implying that granulation/sphene formation and Fe depletion of decomposed titanomagnetite grains in classes II-III do not necessarily cause complete remagnetization or the acquisition of significant secondary remanent magnetizations.

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