Three-dimensional visualization of a near-vertical slab tear beneath the southern Mariana arc
نویسندگان
چکیده
منابع مشابه
Peridotites from the Mariana Trough: first look at the mantle beneath an active back-arc basin
Two dives of the DSV Shinkai 6500 in the Mariana Trough back-arc basin in the western Pacific sampled back-arc basin mantle exposures. Reports of peridotite exposures in back-arc basin setting are very limited and the lack of samples has hindered our understanding of this important aspect of lithospheric evolution. The Mariana Trough is a slow-spreading ridge, and ultramafic exposures with asso...
متن کاملElement transport from slab to volcanic front at the Mariana arc
We present a comprehensive geochemical data set for the most recent volcanics from the Mariana Islands, which provides new constraints on the timing and nature of fluxes from the subducting slab. The lavas display many features typical of island arc volcanics, with all samples showing large negative niobium anomalies and enrichments in alkaline earth elements and lead (e.g., high Ba/La and Pb/C...
متن کاملWaveform modeling of the slab beneath Japan
[1] The tomographic P wave model for the Japan subduction zone derived by Zhao et al. (1994) has two very striking features: a slab about 90 km thick with P wave velocities 3– 6% higher than the surrounding mantle and a mantle wedge with 6% low-velocity anomalies. We study three-component seismograms from more than 600 Hi-net stations produced by two earthquakes which occurred in the downgoing ...
متن کاملThe Slab Portal Beneath the Western Aleutians
Tomographic images of the distribution of shear wave speed beneath the northwestern Pacific delineate the configuration of the subducted oceanic lithosphere beneath the western Aleutian Arc. At ~100 km depth, a fast shear wave speed anomaly lies beneath the Aleutian Arc everywhere east of 173E. Between 164E and 173E, however, seismic velocities at this depth are slow relative to the surrounding...
متن کاملThe Fina Nagu volcanic complex: Unusual submarine arc volcanism in the rapidly deforming southern Mariana margin
In the Mariana convergent margin, large arc volcanoes disappear south of Guam even though the Pacific plate continues to subduct and instead, small cones scatter on the seafloor. These small cones could form either due to decompression melting accompanying back-arc extension or flux melting, as expected for arc volcanoes, or as a result of both processes. Here, we report the major, trace, and v...
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ژورنال
عنوان ژورنال: Geochemistry, Geophysics, Geosystems
سال: 2006
ISSN: 1525-2027
DOI: 10.1029/2005gc001110