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- W4220966730 endingPage "104012" @default.
- W4220966730 startingPage "104012" @default.
- W4220966730 abstract "The Cretaceous rift magmatic activity along the southern margin of Eurasia is ideal for testing how the far-field magmatism, with alkaline to calc-alkaline igneous rocks along the Alborz range, was influenced by the Tethyan subduction zones. Our new and compiled U-Pb ages indicate that significant Cretaceous magmatism in the Iran-Armenia-Turkey Plateau occurred from ~141 Ma to ~75 Ma, lasting ~66 Ma (Valanginian to Campanian). The resultant plutonic, sub-volcanic, and volcanic rocks are incorporated within the Lower-Upper Cretaceous sedimentary successions. The integrated geochronological, geochemical, and isotopic data suggest that the primitive mamas were derived from an enriched mantle source with subduction-related signatures. The significant variations in the composition of the magmas could be due to assimilation-fractional crystallization processes (AFC). The pre-existing Paleo-Tethys subduction beneath the Turan block is considered to have provided the initial source for the mantle wedge enrichment via penetration of slab-derived components. Subsequently, the Cretaceous Neo-Tethys subduction underneath Central Iran and slab rollback led to asthenospheric upwelling, re-melting of metasomatized lithospheric mantle, and extraction of primitive magmas. These early melts underwent further fractionation and contamination within the continental crust generating less- to more-evolved melts. We propose that the Neo-Tethys subduction ignited the Cretaceous rift magmatism in the Iran-Armenia-Turkey Plateau and triggered the transformation of the Eurasian South Caspian Basin crust into stretched high-velocity oceanic-like crust." @default.
- W4220966730 created "2022-04-03" @default.
- W4220966730 creator A5021905687 @default.
- W4220966730 creator A5022257292 @default.
- W4220966730 creator A5029947319 @default.
- W4220966730 creator A5048617340 @default.
- W4220966730 creator A5055577492 @default.
- W4220966730 date "2022-05-01" @default.
- W4220966730 modified "2023-09-29" @default.
- W4220966730 title "Tethyan subduction and Cretaceous rift magmatism at the southern margin of Eurasia: Evidence for crustal evolution of the South Caspian Basin" @default.
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