The study area is located in the western portion of Isfahan, in Shahrekord-Dehsard Terrene. This area is part of the Sanandaj- Sirjan structural Zone. In this area, metamorphosed igneous outcrops contain greenschist and metabasite rocks. These rocks have metamorphed into greenschist facies and belong to the Triassic-Jurassic age. The etabasite is mainly composed of plagioclase, amphibole, epido...

Late Miocene (7–9 Ma) basaltic rocks from the Monbetsu-Kamishihoro graben in northeast Hokkaido have chemical affinities to certain back-arc basin basalts (referred to herein as Hokkaido BABB). Pb-, Ndand Sr-isotopic compositions of the Hokkaido BABB and arc-type volcanic rocks (11–13 Ma and 4–4.5 Ma) from the nearby region indicate mixing between the depleted mantle and an EM II-like enriched ...

Abstract The Yukon-Tanana terrane in the Finlayson Lake district, Yukon, represents one of first arc–back-arc systems that formed adjacent to Laurentian continental margin mid-Paleozoic. Back-arc rocks contain many large and high-grade volcanogenic massive sulfide (VMS) deposits. This study integrates U-Pb zircon geochronology, lithogeochemistry, Hf-Nd isotopes establish precise controls on tec...

Abstract Back-arc spreading is a non-steady-state process exemplified by the repeated cycles of South Fiji and Lau Basins behind Tonga arc, Parece Vela Basin Mariana Trough arc. Spreading in these regions starts with rifting within volcanic arc before shifting to back-arc region where it develops into phase well-defined spreading. 2D thermo-mechanical subduction modeling incorporating transitio...

Back-arc basins in continental settings can develop into oceanic basins, when extension lasts long enough to break up the lithosphere and allow mantle melting that generates new crust. Often, basement of these is not only composed crust, but also exhumed mantle, fragments intrusive magmatic bodies, a complex mid-ocean ridge system characterised by distinct relocations spreading centre. To bette...

Abstract Early Paleozoic accretionary orogens dominated the Western Gondwana margin and were characterized by nearly continuous subduction associated with crustal extension back-arc basin development. The southwestern is represented Famatinian Pampean basement realms exposed in South America, both related to protracted evolution of Terra Australis Orogen, whereas northwestern mainly recorded Ca...