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Rock magnetism and paleomagnetic stratigraphy of forearc sediments of the Japan Trench, ODP Sites 1150 and 1151
Author(s) -
Kanamatsu Toshiya,
Niitsuma Nobuaki
Publication year - 2004
Publication title -
island arc
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.554
H-Index - 58
eISSN - 1440-1738
pISSN - 1038-4871
DOI - 10.1111/j.1440-1738.2003.00420.x
Subject(s) - geology , forearc , paleomagnetism , natural remanent magnetization , remanence , trench , drilling , magnetostratigraphy , rock magnetism , demagnetizing field , paleontology , stratigraphy , geochemistry , magnetization , tectonics , subduction , mechanical engineering , chemistry , physics , organic chemistry , engineering , layer (electronics) , quantum mechanics , magnetic field
Magnetic measurements were carried out to investigate rock magnetic properties and paleomagnetic directions of late and middle Miocene sediments recovered from the land side of the Japan Trench during the Ocean Drilling Program Leg 186. Because the low coercive component in natural remanent magnetization (NRM) normalized by anhysteretic remanent magnetization shows that the drilling‐induced magnetization is severe in the sections obtained by the advanced hydraulic piston coring method, careful analyses of demagnetization of NRM using the ‘demagnetization plane’ were carried out to decompose the direction and intensity. Magnetostratigraphic correlation down to the upper Miocene, supplemented by biostratigraphic data, revealed that the sedimentation rates are characterized by drastic changes, with the early Pliocene having the highest rate. This high sedimentation rate is related to the subsidence of the southern deep‐sea terrace of the Japan Trench.