Paleointensity measurements of pyroclastic flow deposits co-born with widespread tephras in Kyushu Island, Japan

Details Paleointensity measurements of pyroclastic flow deposits co-born with widespread tephras in Kyushu Island, Japan Paleointensity measurements of pyroclastic flow deposits co-born with widespread tephras in Kyushu Island, Japan

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pepi..133..159t&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 133, Issue 1-4, p. 159-179.

Physics

6

Scientific paper

We report the results of paleointensity determination with welded pyroclastic flow deposits co-born with widespread tephras derived from Kikai (K-Ah, 7.3ka), Aira (AT, 28ka), and Aso (Aso-1, 270ka; Aso-2, 140ka; Aso-3, 120ka; Aso-4, 90ka) calderas in Kyushu Island, Japan. Since the widespread tephras are commonly used as good key layers, their ages and oxygen isotope stages have been well established. Thermal demagnetization and several rock magnetic experiments showed that the pyroclastic flow samples had stable remanent magnetizations and are suitable for paleointensity measurements. Using Thelliers' method, we obtained reliable paleointensities from six eruptive units, and calculated corresponding virtual dipole moment (VDM) values ranging from 2.7 to 9.7×1022Am2. VDMs for the youngest units, K-Ah and AT, are consistent with the global trend of increasing dipole moment for the past 40kyr. Aso-4, -3 and -1 yield moderate VDMs similar to the mean paleointensity for the past 1Myr, and especially, the results from Aso-4 and -3 show good agreement with the VDM variation between 70 and 130ka obtained from La Réunion Island [J. Geophys. Res. 96 (1991) 1981; Earth Planet. Sci. Lett. 140 (1996) 173]. A low VDM value and an abnormal VGP position obtained from Aso-2 suggest a possibility that Aso-2 records an excursion-like event occurred around 140ka between Blake and Jamaica events.

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