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No short reversals of Brunhes Age recorded in the Toba Tuffs, north Sumatra, Indonesia
Author(s) -
Diehl J. F.,
Onstott T. C.,
Chesner C. A.,
Knight M. D.
Publication year - 1987
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl014i007p00753
Subject(s) - geology , caldera , paleomagnetism , volcano , seismology , paleontology
Paleomagnetic and 40 Ar/ 39 Ar data indicate that two tuffs are present at Siguragura, North Sumatra, Indonesia: a reversely magnetized tuff (the earliest eruptive unit of the Toba caldera) of Matuyama age (0.84 Ma) and a normally magnetized tuff (the last eruptive unit of the Toba caldera) of late Brunhes age. No reversely magnetized tuffs of late Brunhes age are present at this location as suggested by previous investigators.