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Peridotites and volcanics from the Yap arc system: implications for tectonics of the southern Philippine Sea Plate

Peridotites and volcanics from the Yap arc system: implications for tectonics of the southern Philippine Sea Plate
Peridotites and volcanics from the Yap arc system: implications for tectonics of the southern Philippine Sea Plate
Satellite altimetry reveals a continuous, N20°E-trending bathymetric feature, extending from the Yap Trench through the North Yap Escarpment (NYE) to the Parece Vela Rift, suggesting a genetic relationship. We report the results of submersible observations and geochemical study of peridotites and volcanics from the Yap Trench and the North Yap Escarpment, and use these to understand the genesis and evolution of the Yap arc system. Metamorphosed rocks and gabbros of the Parece Vela Basin origin predominate on the Yap Islands and for the upper part of the forearc, although minor remnant arc volcanics of 25 Ma age exist. There are also arc volcanics of 11–7 Ma age in the forearc, whereas depleted arc-type mantle peridotites are exposed along faults in the lower part of the forearc landward slope. The results show that the Yap arc–North Yap Escarpment system might form as an incipient arc system at the propagating tip of the Parece Vela Rift at 25 Ma, and that the overall Yap arc–forearc region is composed of several different units.
Yap arc system, North Yap Escarpment, Peridotite, Volcanics, Geochemistry, Tectonics, K–Ar age
0009-2541
35-53
Ohara, Yasuhiko
6dfb55fe-4961-418a-99ca-daa1862e2887
Fujioka, Kantaro
4360bef4-5b7d-4da0-bfb6-739f7b0b3f83
Ishizuka, Osamu
1fb98a88-bff7-4200-a09d-92ddf1616058
Ishii, Teruaki
26e3bf43-9301-4948-ac4d-db4690e7ee2c
Ohara, Yasuhiko
6dfb55fe-4961-418a-99ca-daa1862e2887
Fujioka, Kantaro
4360bef4-5b7d-4da0-bfb6-739f7b0b3f83
Ishizuka, Osamu
1fb98a88-bff7-4200-a09d-92ddf1616058
Ishii, Teruaki
26e3bf43-9301-4948-ac4d-db4690e7ee2c

Ohara, Yasuhiko, Fujioka, Kantaro, Ishizuka, Osamu and Ishii, Teruaki (2002) Peridotites and volcanics from the Yap arc system: implications for tectonics of the southern Philippine Sea Plate. Chemical Geology, 189 (1-2), 35-53. (doi:10.1016/S0009-2541(02)00062-1).

Record type: Article

Abstract

Satellite altimetry reveals a continuous, N20°E-trending bathymetric feature, extending from the Yap Trench through the North Yap Escarpment (NYE) to the Parece Vela Rift, suggesting a genetic relationship. We report the results of submersible observations and geochemical study of peridotites and volcanics from the Yap Trench and the North Yap Escarpment, and use these to understand the genesis and evolution of the Yap arc system. Metamorphosed rocks and gabbros of the Parece Vela Basin origin predominate on the Yap Islands and for the upper part of the forearc, although minor remnant arc volcanics of 25 Ma age exist. There are also arc volcanics of 11–7 Ma age in the forearc, whereas depleted arc-type mantle peridotites are exposed along faults in the lower part of the forearc landward slope. The results show that the Yap arc–North Yap Escarpment system might form as an incipient arc system at the propagating tip of the Parece Vela Rift at 25 Ma, and that the overall Yap arc–forearc region is composed of several different units.

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More information

Published date: 16 September 2002
Keywords: Yap arc system, North Yap Escarpment, Peridotite, Volcanics, Geochemistry, Tectonics, K–Ar age

Identifiers

Local EPrints ID: 59176
URI: http://eprints.soton.ac.uk/id/eprint/59176
ISSN: 0009-2541
PURE UUID: c002b7f4-e964-40b9-a6b6-7bd0bf015af0

Catalogue record

Date deposited: 26 Aug 2008
Last modified: 15 Mar 2024 11:14

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Contributors

Author: Yasuhiko Ohara
Author: Kantaro Fujioka
Author: Osamu Ishizuka
Author: Teruaki Ishii

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