Unzipping of the volcano arc, Japan

Stern, Robert J.; Smoot, N. Christian; Rubin, Meyer

doi:10.1016/0040-1951(84)90012-x

Cited by 76 publications

(40 citation statements)

References 31 publications

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“…GPS-derived rifting rates in the Marianas back arc are consistent with marine geophysical estimates (see review by Kato et al [2003]). The Ogasawara Plateau collision point migrates northward at $1.2 cm/a (based on Pacific and Philippine Sea Plate relative motion [Sella et al, 2002]), similar to the observed northward propagation of the Marianas rift tip [e.g., Stern et al, 1984]. The Ogasawara Plateau began subducting at the Marianas trench $8 Ma ago [Miller et al, 2006], similar to the Late Miocene onset of Marianas rifting [Karig et al, 1978;Bibee et al, 1980;Hussong and Uyeda, 1981], suggesting a possible relationship between the collision, rotation, and rifting in the Marianas.…”

Section: A222 Iransupporting

confidence: 63%

Collisional model for rapid fore‐arc block rotations, arc curvature, and episodic back‐arc rifting in subduction settings

Wallace

Ellis

Mann

2009

Geochem Geophys Geosyst

104

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[1] We review geophysical and geological data from 23 active and ancient plate boundaries to document a compelling spatial and temporal relationship between collision, plate boundary curvature, rapid tectonic rotations, and the occurrence of back-arc rifting. Our observations support a conceptual model where the change from subduction to collision causes rapid fore-arc rotation (when viewed in a reference frame relative to the bounding tectonic plates), leading to marked plate boundary curvature. Our global compilation reveals that most active back-arc rifts are associated with rapidly rotating fore arcs and nearby collisions. Thus, we propose that collision and rapid fore-arc rotations play a major role in the evolution and kinematics of back-arc basins. We conduct numerical modeling to better understand the physical processes behind these observed rapid tectonic rotations at convergent margins. Our results suggest that the presence of an indentor or choke point in the subduction system (e.g., collision) can generate rapid rotation of the fore arc about a nearby pole and lead to back-arc rifting. The rate of fore-arc rotation and back-arc rifting depends on the incoming indentor velocity and can be greatly enhanced by slab rollback and the presence of a low-viscosity back arc. Where viscosity of the back arc is low, fore-arc rotation dominates; where back-arc viscosity is high, the formation of strike-slip faults and tectonic escape dominates. Our observational and model-derived results illustrate that shallow crustal forces produced by the entry of buoyant features into subduction zones are a fundamental mechanism for the generation of fore-arc block rotations, plate boundary curvature, back-arc rift evolution, and tectonic escape in subduction systems. Rollback of the subducting slab within the mantle will certainly enhance the processes we describe but it is not the only driving force. Wallace, L. M., S. Ellis, and P. Mann (2009), Collisional model for rapid fore-arc block rotations, arc curvature, and episodic back-arc rifting in subduction settings, Geochem. Geophys. Geosyst., 10, Q05001,

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Section: A222 Iransupporting

confidence: 63%

Collisional model for rapid fore‐arc block rotations, arc curvature, and episodic back‐arc rifting in subduction settings

Wallace

Ellis

Mann

2009

Geochem Geophys Geosyst

104

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“…Shoshonitic magmas erupt along a 150-km segment adjacent to the magmatic front in the Northern Seamount Province (Stern et al 1988;Bloomer et al 1989) in an area referred to as the Alkalic Volcano Province (AVP). Generation of these rocks has been variously interpreted to be associated with arc rifting following collision of an oceanic plateau (the Ogasawara Plateau; Stern et al 1984;Honza and Tamaki 1985), development of a new arc segment following arc rifting (Stern et al 1988), or along strike extension of the arc/forearc region as plate convergence becomes more oblique (Fryer et al 1997).…”

Section: Discussionmentioning

confidence: 99%

Shoshonites in Southern Tibet Record Late Jurassic Rifting of a Tethyan Intraoceanic Island Arc

Aitchison¹,

McDermid²,

Ali³

et al. 2007

The Journal of Geology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. A B S T R A C TDetailed field mapping combined with a petrologic and geochemical investigation of the Zedong terrane within the Yarlung Tsangpo suture zone provides insights to the evolution of now mostly subducted portions of Tethys during the Late Jurassic. The terrane is dominated by volcanic rocks of shoshonitic affinity, which were erupted in a submarine oceanic island arc setting. The volcanic island arc was built on a basement of oceanic crust, and the shoshonites locally overlie a thin section of pillowed island arc tholeiites and red ribbon-bedded radiolarian cherts. Geochemistry of the shoshonites suggests that their development occurred in a setting analogous to that of Late Miocene to Early Pliocene Fiji and was associated with an arc rifting. We speculate that this event may have been a far-field response to developments associated with Gondwana breakup.

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“…Except for the old data published by Pushkar (1968), there are no reports of volcanism from the Mariana Arc with 87 Sr/ 86 Sr values higher than 0.70362 (Woodhead and Fraser, 1985). The highest 87 Sr/ 86 Sr value reported from the Volcano Arc is 0.70387 (Stern et al, 1984). On the other hand, the Ryukyu Arc volcanoes Kikai, Sakurajima, and Kirishima ( Fig.…”

Section: Correlation Of the Calc-alkaline Layersmentioning

confidence: 93%

Characterization and Correlation of Megascopic Tephras in Site 792 Cores from the Izu-Ogasawara Forearc Basin (Japan) by Trace Elements and 87Sr/86Sr and 143Nd/144Nd Isotopes

Egeberg¹,

Brunfelt²,

Stabel³

1992

Proceedings of the Ocean Drilling Program

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Glass shards from 26 megascopic tephras (1-29 cm thick) were separated and analyzed for 26 elements and 87 Sr/ 86 Sr and 143 Nd/ 144 Nd isotope ratios. The isotope data allowed us to assess the degree of alteration of the samples. The separates contain less than 10% of palagonitized glass or secondary alteration minerals. Correlation diagrams and multivariate analyses have been used to characterize the glass shards in a tectonic setting and group the tephras according to their magmatic affinity. Four tholeiitic groups, two calc-alkaline groups, and one group with glass of shoshonitic affinity can be distinguished. The tholeiitic groups form a time series; however, judging from the rare-earth-element patterns and the temporal variations of the Ce/Yb ratios, the evolution is not unidirectional from strong to weak tholeiitic affinity.The tephras have been correlated with volcanism along the Izu-Ogasawara and Ryukyu arcs by means of trace element distribution, 87 Sr/ 86 Sr ratios, and their magmatic affinity. The tholeiitic layers were derived from volcanoes on the Izu-Ogasawara Arc, most probably from the volcanic island Hachijojima. Only one group of the calc-alkaline layers can have derived from the Izu-Ogasawara Arc. The other calc-alkaline layers and the two layers with shoshonitic affinity probably derive from volcanism along the Ryukyu Arc.

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Unzipping of the volcano arc, Japan

Cited by 76 publications

References 31 publications

Collisional model for rapid fore‐arc block rotations, arc curvature, and episodic back‐arc rifting in subduction settings

Collisional model for rapid fore‐arc block rotations, arc curvature, and episodic back‐arc rifting in subduction settings

Shoshonites in Southern Tibet Record Late Jurassic Rifting of a Tethyan Intraoceanic Island Arc

Characterization and Correlation of Megascopic Tephras in Site 792 Cores from the Izu-Ogasawara Forearc Basin (Japan) by Trace Elements and 87Sr/86Sr and 143Nd/144Nd Isotopes

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