volcanic arc


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Related to volcanic arc: accretionary wedge, Fracture zone

volcanic arc

[väl‚kan·ik ′ärk]
(geography)
References in periodicals archive ?
Petrology and geochemistry of lower to middle Ordovician igneous rocks in Wales: a volcanic arc to marginal basin transition.
We finally examine the significance of our results for the overall development of the El Salvador Volcanic Arc and the role of the ESFZ in the accommodation of the regional tectonic strain.
These samples are distinct from normal ocean floor lavas and geochemically identical to the presently active South Sandwich Islands volcanic arc to the east of the Scotia Sea that today forms a barrier to the ACC, diverting it northward.
For example, if all Phanerozoic volcanic arcs are palaeo-geographically delineated and reconstructed to their present-day locations, then some of them (from different geological time periods) will overlap in areas where subduction was pro longed, or where subduction-related magmatism repeatedly affected the same area of continental crust.
Amongst these is a slice of volcanic arc rocks known as the Warraweena Volcanics.
Lucia is an Eastern Caribbean Island that is part of the Lesser Antilles volcanic arc.
the deposits considered as Upper Triassic are fossiliferous in the Vizcaino Peninsula, but they are not in Cedros; and, conversely, the deposits considered as belonging to the San Andres volcanic arc in both areas are fossiliferous only in Cedros).
The presence of a negative Eu anomaly in many tholeiitic and calc-alkalic volcanic arc suites is consistent with plagioclase fractionation, which is typical of processes in crustal magma chambers and matches field and petrographic evidence of the abundance of plagioclase phenocrysts.
In a back-arc basin, spreading splits the ocean floor apart very close to a volcanic arc.
The Kingston terrane, southern New Brunswick, Canada: Evidence for a Silurian volcanic arc.
The deformed sedimentary and volcanic rocks in the region are described as two geological terranes, known as the Songpan Garze Terrane and Yidun Volcanic Arc respectively (see Figure 2 for location).