6 wt%), Ba (~712 ppm) and Rb (~86 ppm) contents than that of adakites.
12a, b, samples fall mostly in the field of adakites derived from the partial melting of the thick lower crust and metabasaltic and eclogite fields, rather than in that of adakite rocks derived from the partial melting of the delaminated lower crust.
Petrology and geochemistry of Camiguin Island, southern Philippines: insights to the source of adakites
and other lavas in a complex arc setting.
(HSA) and that the parental magma was generated as a result of subduction and partial melting of an oceanic slab and its overlying sediments and have a post-collisional affinity (Kohnavard, 2015).
2001): Late Miocene adakites
and N-b-enriched basalts from Vizcaino Peninsula, Mexico: Indicators of East Pacific Rise subduction below southern Baja California?
7 Ga adakites
, magnesian andesites, and arc basalts, Superior Province: evidence for shallow crustal recycling at Archean subduction zones.
adakites, shoshonites, and boninites) are reviewed and the paper concludes with a brief overview of arc rocks in ancient settings.
Shoshonites, boninites and adakites are volumetrically small, but are nonetheless petrologically significant igneous rocks that form in specialized arc environments.
5 wt % MgO) are characteristic of high-Mg adakites
, suggesting chemical interactions between slab-derived melts and Mg-rich peridotite within the sub-arc mantle wedge.
Variable enrichment of Ba relative to Rb and Th of the type displayed by the Ross Island Formation andesite samples is also observed in adakites from the Austral Volcanic Zone of the Andes (Stern and Kilian 1996; Wilson 1989).
Role of subducted slab, mantle wedge and continental crust in the generation of adakites from the Andean Austral Volcanic Zone.
For both La Yeguada and El Valle, the term adakite
was applied to the young group of rocks based on chemical composition (Richards, 2007) and was presumed to result from a change of style in sub-duction below the Panama block (Castillo, 2006).