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Book Chapter

The Japan Trench: Line Ori 78-4

By
Roland von Huene
Roland von Huene
U.S. Geological Survey Menlo Park, California
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Raymond Culotta
Raymond Culotta
U.S. Geological Survey Menlo Park, California
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Noriyuki Nasu
Noriyuki Nasu
Ocean Research Institute University of Tokyo Tokyo, Japan
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Yutaka Aoki
Yutaka Aoki
JAPEX Geoscience Institute Exploration and Development Tokyo, Japan
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Published:
January 01, 1986

Abstract

The Japan Trench off northern Honshu Island is associated with a backarc basin, a magmatic arc, a forearc basin, and a continental shelf that is submerged deeper than the usual shelf above 200 m water depth. The latest period of arc magmatism began to build the volcanic backbone of Honshu Island in late Oligocene to early Miocene time, and an intense Miocene period of volcanism produced green tuff, a thick complex of altered felsic to mafic volcanic rock interbedded with marine sediment. Other times of accelerated volcanism occurred in the Pliocene and Pleistocene (Cadet and Fujioka, 1980).

The Pacific side of Honshu Island is built on an older continental framework encompassing the Kitakami massif, a large body of Mesozoic and Paleozoic rock overlain by a transgressive Cretaceous sediment sequence. In the adjacent submerged area is a deep basin filled with Cretaceous to Recent sediment (see diagrammatic section). The seaward flank of the basin is truncated by subaerial erosion as is the adjacent 35-km-wide section of Cretaceous rock that comprises the seaward part of the margin. The unconformity marking the top of the Cretaceous complex is prominent in many multichannel records across this margin, and it marks an abrupt change from rocks with a low to rocks with a high acoustic velocity.

Paleogene sediment also fills part of the basin, but its seaward extent is limited. Neogene sediment with a basal Oligocene unit underlain in turn by the Cretaceous complex was penetrated at DSDP site 439 (see diagrammatic section), and geophysical

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Contents

AAPG Studies in Geology

Seismic Images of Modern Convergent Margin Tectonic Structure

Roland von Huene
Roland von Huene
U.S. Geological Survey Menlo Park, California
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Susan Vath
Susan Vath
U.S. Geological Survey Menlo Park, California
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Christine Sperber
Christine Sperber
U.S. Geological Survey Menlo Park, California
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Bridgett Fulop
Bridgett Fulop
U.S. Geological Survey Menlo Park, California
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Lee Bailey
Lee Bailey
U.S. Geological Survey Menlo Park, California
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Monique Martin
Monique Martin
U.S. Geological Survey Menlo Park, California
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American Association of Petroleum Geologists
Volume
26
ISBN electronic:
9781629811499
Publication date:
January 01, 1986

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