Negative Nb and positive Sr anomalies indicate island arc
type tectonic setting.
Compared with depleted high-field-strength elements, they show notable characteristics of depleted Nb and Ta, which is similar to that of island arc
magmatite in subduction zone; both of their mineral compositions are generally consistent with those of amphibole calc-alkaline granitoid (ACG) under the mechanism of subduction (Lei et.
Hayasaka, "Genesis and evolutional processes of the Paleozoic oceanic island arc
crust, Asago body of the Yakuno ophiolite, southwest Japan," Journal of the Geological Society of Japan, vol.
In Basaltic Volcanism Associated with Extensional Tectonics in the Taiwan-Luzon Island Arc
: Evidence for Non-depleted Sources and Subduction Zone Enrichment (ed.
Taken together, the evidence suggests that 50 million years ago, India collided with an island arc
, pushing it northward.
In all the above-mentioned four sets of new discriminant function based tectonomagmatic diagrams, there is no differentiation between the continental and oceanic arc settings, and the entire arc setting is represented by island arc
Farhoudi , introduce 3subdivision for Zagros based on similarity that exist between Zagros and island arc
1982: Petrogenesis of the island arc
tholeiite series of the South Sandwich Islands.-- University of Leeds, U.K.
Eighteen contributed chapters honoring Windley's influence are arranged in sections on oceanic and island arc
systems and continental growth, the tectonics of accretionary orogens and continental growth, growth and stabilization of continental crust (collisions and intraplate processes), Precambrian tectonics and the birth of continents, and active tectonics and geomorphology of continental collision and growth zones.
Systematic changes in the distribution of some oxides in the profile from the continent towards the island arc
across the Philippine Sea can be stated: CaO and S[O.sub.3] contents increase while [K.sub.2]O/[Na.sub.2]O ratio decreases, evidently as the influence of terrigenous contribution became weaker.
Pinet and Tremblay (1995) proposed that emplacement of the Quebec ophiolites was caused by the collision of an island arc
with the North American continent during the Ordovician.
1, Sumatera is like other islands of Indonesia, representing and island arc
where the formation was related to the activity of subduction zone.