Magnetostratigraphy of the Late Triassic Bolücektası Tepe section (southwestern Turkey): implications for changes in magnetic reversal frequency

Details Magnetostratigraphy of the Late Triassic Bolücektası Tepe section (southwestern Turkey): implications for changes in magnetic reversal frequency Magnetostratigraphy of the Late Triassic Bolücektası Tepe section (southwestern Turkey): implications for changes in magnetic reversal frequency

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...73...85g&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 73, Issue 1-2, p. 85-108.

Physics

24

Scientific paper

A magnetostratigraphic study of light-pink to white pelagic limestones from the Bolücektası Tepe section (southwestern Turkey) provides a magnetic polarity sequence well calibrated with the conodont zonation for the Lower Carnian and uppermost Carnian-Middle Norian (Late Triassic). Thermal (between 400 and 550°C) and alternating field (30-60 mT) demagnetizations isolate the characteristic remanent components. Rock magnetic experiments suggest that magnetite is the dominant magnetic carrier, but a small hematite fraction also exists in the Lower Carnian light-pink limestones. A major sedimentary gap (Middle-Upper Carnian) divides the section in two submembers which reveal two statistically different mean directions, differing in declination by about 30°. A sequence of 39 polarity intervals is obtained, 18 in the Carnian (ten in the Lower Carnian and eight in the uppermost Carnian) and 21 in the Lower-Middle Norian. The magnetic reversal frequencies which can be derived from these results, together with the available magnetostratigraphic data for the Middle-Early Jurassic, Triassic and Late Permian, show a pattern which is in rough agreement with the suggested 150-200 million year time constant in the reversal process since the Kiaman superchron. However, significant short-period fluctuations in reversal frequency cannot be excluded.

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