Nature and growth rate of the Northern Izu–Bonin (Ogasawara) arc crust and their implications for continental crust formation

Taira, Asahiko; Saito, Saneatsu; Aoike, Kan; Morita, Sumito; Tokuyama, Hidekazu; Suyehiro, Kiyoshi; Takahashi, Narumi; Shinohara, Masanao; Kiyokawa, Schoichi; Naka, Jiro; Klaus, A.

doi:10.1111/j.1440-1738.1998.00198.x

Cited by 117 publications

(32 citation statements)

References 69 publications

(90 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Collision of the northern IBM arc with central Honshu has been occurring since the mid Miocene ( 15 Ma) (Niituma, 1989;Soh et al, 1991;Takahashi and Saito, 1997;Aoike, 1999). The collision has led to the accretion of the Izu Bonin arc crust onto the Honshu arc, associated with the sequential southward migration of the plate boundary and trench (Soh et al, 1991;Taira et al, 1998). Four tectonic segments of the IBM arc; the Kushigatayama, Misaka, Tanzawa, and Izu terranes, are distributed in the Izu collision zone (Amano, 1991;Aoike, 1999).…”

Section: Geological Backgroundmentioning

confidence: 99%

Petrogenesis of Ashigawa and Tonogi granitic intrusions, southern part of the Miocene Kofu Granitic Complex, central Japan: M-type granite in the Izu arc collision zone

Saito

Arima

Nakajima

et al. 2004

Journal of Mineralogical and Petrological Sciences

View full text Add to dashboard Cite

The Ashigawa and the Tonogi intrusions comprise the southern part of the Miocene Kofu Granitic Complex (KGC), which is the largest pluton exposed in the Izu collision zone. The Ashigawa intrusion mainly consists of tonalite and subordinate amounts of trondhjemite, and the Tonogi intrusion is predominantly composed of tonalite. The rocks in both intrusions are classified as M type granite. These are characterized by relatively low K 2 O (<1.9 wt.%) and Rb (<48 ppm) and LREE enriched chondrite normalized REE patterns with a marked negative Eu anomaly. Compared to the Tanzawa tonalites distributed in the south of the KGC, the Ashigawa and Tonogi granitic rocks have higher LILE, REE and Sr isotope compositions at a given whole rock SiO 2 content. Although the Ashigawa intrusion has distinctly different petrographical and geochemical characteristics from the Tonogi intrusion, both intrusions exhibit nearly identical Sr isotopic composition (0.7037 0.7043 at 13Ma) and well defined variation in whole rock compositions, suggesting that they are comagmatic. The crystal fractionation modeling involving removals of amphibole, plagioclase and magnetite from a tonalitic parental magma composition well represents the major and trace element variation of the Ashigawa and Tonogi granitic rocks. The Rayleigh fractionation modeling for whole rock REE abundance is also in a good agreement with the observed whole rock data. Mass balance modeling suggests that the proposed tonalitic parental magma can be derived by 40 % melting of hydrous basalt compositionally similar to the basalt occurring in the rift basin of northern Izu Bonin arc. Anatexis of hydrous basaltic lower crust of the northern Izu Bonin arc is a likely process for the formation of Ashigawa Tonogi parental magma.

show abstract

Section: Geological Backgroundmentioning

confidence: 99%

Petrogenesis of Ashigawa and Tonogi granitic intrusions, southern part of the Miocene Kofu Granitic Complex, central Japan: M-type granite in the Izu arc collision zone

Saito

Arima

Nakajima

et al. 2004

Journal of Mineralogical and Petrological Sciences

View full text Add to dashboard Cite

show abstract

“…Since these velocities correspond to the range of velocities in an upper part of continental crust [Christensen and Mooney, 1995], Suyehiro et al [1996] concluded that continental crust was created in the middle of the crust even though large basalt volcanoes were observed in the Izu arc. Rock samples representative of the layer with Vp in the range 6.0 -6.4 km s À1 collected at the Izu collision zone in central Japan were interpreted to be tonalitic [Taira et al, 1998]. A characteristic of the northern Izu arc is the high-velocity layer (Vp = 7.1-7.3 km s…”

Section: Introductionmentioning

confidence: 99%

Seismological evidence for variable growth of crust along the Izu intraoceanic arc

Kodaira¹,

Sato²,

Takahashi³

et al. 2007

J. Geophys. Res.

Self Cite

145

209

View full text Add to dashboard Cite

[1] The processes that create continental crust in an intraoceanic arc setting are a matter of debate. To address this issue, we conducted an active source wide-angle seismic study to examine along-arc structural variations of the Izu intraoceanic arc. The data used were acquired over a 550-km-long profile along the volcanic front from Sagami Bay to Tori-shima. The obtained structural model showed the existence of felsic to intermediate composition middle crust with a P wave velocity (Vp) of 6.0-6.5 km s À1 in its upper part and 6.5-6.8 km s À1 in its lower part. The thickness of the middle crust varied markedly from 3 to 13 km. The underlying lower crust also consisted of two layers (Vp of 6.8-7.2 km s À1 in the upper part and Vp of 7.2-7.6 km s À1 in the lower part). The upper of these layers was interpreted to consist of plutonic gabbro, and the lower layer was interpreted to be mafic to ultramafic cumulates. Average crustal velocities calculated from our model showed remarkable lateral variation, which correlated well with arc volcanism. Low average crustal seismic velocities ($6.7 km s À1

show abstract

“…The Tanzawa Mountains are thought to be fragments of the Izu-Bonin arc that have accreted onto the Honshu block. Several tectonic faults, such as the Tonoki-Aikawa Tectonic Line and the Kozu-Matsuda Fault have developed around the area (e.g., Taira et al, 1998;Arai et al, 2009). The configuration of the subducting PHS plate in and around this region has been estimated based on the hypocenter distribution, S-P converted waves, seismic velocity tomography, and the seismic profile (e.g., Ishida, 1992;Iidaka et al, 1990;Tsumura et al, 1993;Matsubara et al, 2005;Sato et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Seismotectonics in the Tanzawa Mountains area in the Izu-Honshu collision zone of central Japan, as revealed by precisely determined hypocenters and focal mechanisms

et al. 2012

View full text Add to dashboard Cite

We investigate the detailed distribution of hypocenters and focal mechanisms beneath the Tanzawa Mountains, central Japan, where the Izu-Bonin arc has collided into the central part of the Honshu arc. Remarkable differences are found to exist between the hypocenter distributions in the western and eastern parts. The hypocenters of earthquakes in the eastern part tend to be distributed in a horizontal zone, whereas those in the western part are distributed in a volume. The focal mechanisms in the eastern part are right-lateral reverse faulting mechanisms, and one of the nodal planes is consistent with the geometry of the Philippine Sea (PHS) plate in the region. These results suggest that most earthquakes in the eastern part occur along the upper surface of the subducting PHS plate. In contrast, the focal mechanisms in the western part, especially deep in the western part, exhibit a different feature. The stress states in these two regions are found to be significantly different. The maximum and minimum principal stress axes in the eastern part are slightly inclined, whereas those in the western part are oriented in approximately the vertical and horizontal directions, respectively. The stress field in the eastern part may be caused by a slab pull force induced from the deeper part of the subducted plate.

show abstract

Nature and growth rate of the Northern Izu–Bonin (Ogasawara) arc crust and their implications for continental crust formation

Abstract: The bulk composition of

Cited by 117 publications

References 69 publications

Petrogenesis of Ashigawa and Tonogi granitic intrusions, southern part of the Miocene Kofu Granitic Complex, central Japan: M-type granite in the Izu arc collision zone

Petrogenesis of Ashigawa and Tonogi granitic intrusions, southern part of the Miocene Kofu Granitic Complex, central Japan: M-type granite in the Izu arc collision zone

Seismological evidence for variable growth of crust along the Izu intraoceanic arc

Seismotectonics in the Tanzawa Mountains area in the Izu-Honshu collision zone of central Japan, as revealed by precisely determined hypocenters and focal mechanisms

Contact Info

Product

Resources

About