Structural and Kinematic Evolutions of the Okinawa Trough Backarc Basin

Sibuet, Jean‐Claude; Hsu, Shu-Kun; Shyu, Chuen-Tien; Liu, Char‐Shine

doi:10.1007/978-1-4615-1843-3_9

Cited by 115 publications

(102 citation statements)

References 29 publications

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“…The amount of extension for this phase was estimated to be 25 km in the northern OT. The pole of rotation is located east of Tokyo, in the northeast extension of OT [Sibuet et al, 1995;Thateau, 1996].…”

Section: Tectonic Setting Of the Okinawa Troughmentioning

confidence: 99%

“…Thus the early phase of extension is poorly constrained from geological data. However, if considered as a single homogeneous phase occurring in the whole OT, this phase is a major tectonic phase with about 60 km of extension in the northern OT and 50 km in the southwestern OT, the corresponding pole of rotation being located in Sumatra, in the southwestward extension of OT [Sibuet et al, 1995;Thateau, 1996]. Eighteen EM12/EM950 swath-bathymetric profiles trending NE-SW were acquired obliquely to the general E-W direction of the trough in order to establish the possible existence of three major NW-SE trends already inferred from gravity, magnetic, and earthquake data [Hsu et al, 1996a].…”

Section: Tectonic Setting Of the Okinawa Troughmentioning

confidence: 99%

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Okinawa trough backarc basin: Early tectonic and magmatic evolution

Sibuet¹,

Deffontaines²,

Hsu³

et al. 1998

J. Geophys. Res.

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369

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Section: Tectonic Setting Of the Okinawa Troughmentioning

confidence: 99%

Section: Tectonic Setting Of the Okinawa Troughmentioning

confidence: 99%

Okinawa trough backarc basin: Early tectonic and magmatic evolution

Sibuet¹,

Deffontaines²,

Hsu³

et al. 1998

J. Geophys. Res.

Self Cite

369

300

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“…The main stage of the HMA volcanism in northern Kyushu overlaps with the commencement of the subduction of the Philippine Sea plate (6 -4 Ma; Kamata and Kodama, 1994) and the second phase of rifting of the Okinawa Trough (upper Pliocene to upper Pleistocene; Sibuet et al, 1995). This tectonic setting of northern Kyushu, which includes the subduction of a young oceanic slab and the extension of the backarc, is similar to the setting associated with the Setouchi HMA.…”

Section: The Relationship Between Hma Magma-tism and Tectonics In Normentioning

confidence: 74%

“…Three phases of extension Pliocene to upper Pleistocene, and (3) upper Pleistocene to recent. The second phase of extension is related to a main formation of the trough (Sibuet et al, 1995). This backarc rifting activated the volcanism in the Kyushu backarc region and Ryukyu arc (Kimura et al 2005).…”

Section: Geologic Setting In Northern Kyushumentioning

confidence: 97%

“…This difference in the eruption ages among these HMAs probably resulted from a difference in their distances from the spreading axis of the Okinawa Trough. The Nagasaki area is closer to the axis; hence, the early activity of the Nagasaki HMA is probably affected by the upwelled asthenospheric manmain stage of the Nagasaki HMA volcanism was probably related to the major second rifting phase (Sibuet et al, 1995) of the Okinawa Trough. On the other hand, the Hikosan area is farther from the axis; hence, the asthenospheric mantle probably did not arrive at the source re--rived there in the major second rifting phase.…”

Section: The Relationship Between Hma Magma-tism and Tectonics In Normentioning

confidence: 99%

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K-Ar ages of high-magnesian andesite lavas from northern Kyushu, Japan

Miyoshi¹,

Nasu²,

Tajima³

et al. 2008

Journal of Mineralogical and Petrological Sciences

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We determined the K -Ar ages for the high -magnesian andesites from Miocene -Pliocene period from Hikosan and Nagasaki areas in northern Kyushu, Japan. The obtained K -Ar ages of Hikosan and Nagasaki samples are 4.0 -3.6 Ma and 5.8 -3.7 Ma, respectively. These K -Ar ages suggest that the magmatisms of the high -magnesian andesites coincided with the development of the Okinawa Trough. The upwelling of the hot asthenospheric mantle associated with the backarc rifting probably has a close relationship with the origin of the northern -Kyushu high -magnesian andesite magma.

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Magnetic anomalies associated with abundant production of pyrrhotite in a sulfide deposit in the Okinawa Trough, Japan

Honsho

Yamazaki

Ura

et al. 2016

Geochem Geophys Geosyst

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We report here results from a deep‐sea magnetic survey using an autonomous underwater vehicle over the Hakurei hydrothermal site, in the middle Okinawa Trough. Magnetic inversion revealed that the Hakurei site is associated with well‐defined high‐magnetization zones distributed within a broad low‐magnetization zone. Results from rock magnetic measurements, performed on sulfide ore samples obtained by drilling, showed that some samples possessed extremely high natural remanent magnetization (NRM) (as much as 6.8–953.0 A/m), although most of the measured samples had much lower NRM. These high‐NRM samples were characterized by high Königsberger ratios (101−103), indicating much larger NRM than induced magnetization, and contained pyrrhotite as the only magnetic mineral. This suggests that NRM carried by pyrrhotite is the source of the observed magnetic anomalies. The wide range of NRM intensity was considered to be due to a highly heterogeneous distribution of pyrrhotite, because pyrrhotite was commonly identified in both the high‐NRM and low‐NRM samples. Pyrrhotite production may have been occasionally drastically increased, with highly magnetic ores formed as a result. Rapid burial of active vents may result in the creation of an extensive reducing environment under the seafloor, which is favorable to pyrrhotite production, and may also prevent oxidation of pyrrhotite by isolating it from seawater. Because the magnetization intensity of sulfide ores was highly variable, it would not be straightforward to estimate the quantity of ore deposits from the magnetic anomalies. Nevertheless, this study demonstrates the usefulness of magnetic surveys in detecting hydrothermal deposits.

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Structural and Kinematic Evolutions of the Okinawa Trough Backarc Basin

Cited by 115 publications

References 29 publications

Okinawa trough backarc basin: Early tectonic and magmatic evolution

Okinawa trough backarc basin: Early tectonic and magmatic evolution

K-Ar ages of high-magnesian andesite lavas from northern Kyushu, Japan

Magnetic anomalies associated with abundant production of pyrrhotite in a sulfide deposit in the Okinawa Trough, Japan

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