Paleomagnetic evidence for high-temperature emplacement of the 1883 subaqueous pyroclastic flows from Krakatau volcano, Indonesia

Document Type

Article

Date of Original Version

1-1-1994

Abstract

The paroxysmal 1883 eruption of Krakatau volcano in Indonesia discharged at least 6.5 km3 (dense rock equivalent) of pyroclastic material into the shallow waters of the Sunda Straits within a 15 km radius of the volcano. Progressive thermal demagnetization studies of individually oriented pumice clasts from a core sample of the submarine pyroclastic deposits show that 41 out of 47 clasts exhibit single-component remanence with mean inclination of -2.4°. Estimated subaqueous emplacement temperature for such clasts is greater than 500°C. Paleomagnetic evidence for high-emplacement temperature supports the hypothesis that proximal 1883 submarine pyroclastic deposits resulted from entrance of hot, subaerially generated pyroclastic flows into the sea. -from Authors

Publication Title, e.g., Journal

Journal of Geophysical Research

Volume

99

Issue

B5

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