The number of subduction zones that facilitated the northward translation Anatolide-Tauride continental terrane derived from Gondwana to southern margin Eurasia at longitude western Turkey is debated. We hypothesized if two north dipping incipient collision in Turkey, a late Cretaceous arc would have formed within Neotethys and along Eurasia. To determine an island we investigated sedimentary r...

Abstract The timing of the final welding southern Altaids to construct Pangea is a matter debate which has led considerable uncertainty regarding configuration northeast and reconstruction proto-Asia. Here we investigate provenance sediments deposited within fore-arc accretionary basin located close Akeyazi low temperature ultra-high pressure metamorphic complex in South Tianshan Orogenic Belt....

S U M M A R Y The structure of the oceanic crust conforms in general to a very simple model. However, fine-scale variations of this structure in anomalous regions (such as beneath oceanic islands) remain poorly resolved. Here we examine teleseismic receiver functions (RFs) computed at four permanent broadband seismic stations on islands in the Pacific region. The RF method is ideal for examinin...

Abstract The South Tianshan Orogenic Belt marks the final assembly of southern Altaids and Karakum-Tarim Cratons. Integrated petrological, geochemical, geochronological studies were carried out on Akeyazi high-alumina basaltic lavas (HABs) their host sandstones from margin Central Block. Given relative high alumina contents (Al2O3 > 16 wt%) geochemical similarity to basalts modern arcs (...

The Greater Antilles islands of Cuba, Hispaniola, Puerto Rico and Jamaica plus the Virgin Islands host fragments fossil convergent margin that records Cretaceous subduction (operated for about 90 m.y.) American plates beneath Caribbean plate ensuing arc-continent collision in Late Cretaceous-Eocene time. “soft” between Arc (GAA) Bahamas platform (and Maya Block western Cuba) preserved much marg...

The Eastern Andean Metamorphic Complex at Península La Carmela (48°50’S) consists of quartz-rich metaturbiditic sequences with tectonic slices pillow metabasalt bodies deformed under low-grade metamorphic conditions. Previous and new detrital zircon U–Pb geochronological data from metasandstones indicate a preferred early Carboniferous maximum depositional age the protolith, interpreted younges...

In order to investigate the behavior of slab-derived volatiles in the subduction environment, helium isotope ratios have been measured in geothermal gases from the Tabar-Lihir-TangaFeni (fL TF) chain in the Bismarck Archipelago of Papua New Guinea. As recorded by several geochemical tracers, these volcanos carry an exceptionally large slab-derived component, and therefore may provide new insigh...

Editor: T.M. Harrison Non-arc basalts of Archean and Proterozoic age have model primary magmas that exhibit mantle potential temperatures TP that increase from 1350 °C at the present to a maximum of ∼1500–1600 °C at 2.5–3.0 Ga. The overall trend of these temperatures converges smoothly to that of the present-day MORB source, supporting the interpretation that the non-arc basalts formed by the m...