The Tianshui-Sunjiaxia area is located in the connection zone of West Qinling Orogen and North Qilian Orogen, which could provide great insights into amalgamation processes between northern southern blocks China. Three subduction- rift-related rocks gneissic granite from arc-interarc belt (NQAI) metabasalt back-arc basin (NQBA) are distinguished across zone. was generated by melts older crustal...

Plate reconstructions of the Panthalassa Ocean typically portray a simple system diverging plates surrounded by active margins, yet geological and seismic tomographic records demonstrate that intra-oceanic subduction existed. Here, we reconstruct plate tectonic evolution pre-Cretaceous Oku-Niikappu island arc, remnants which are exposed on Hokkaido, Japan. This arc formed at Jurassic zone separ...

Extensive intraplate volcanism in the East Asia regions, including Dokdo and Ulleungdo (DU), occurred due to extensional stress field during Cenozoic era. However, origin of magmatism is still controversial. Here we report new results helium isotopes olivine clinopyroxene phenocrysts as well major trace element compositions from DU basalts order determine magmas provide insights into mantle dyn...

The provenance of Middle Jurassic-Cretaceous sedimentary rocks deposited in the southern Peruvian Arequipa Basin has been investigated based on measurement 41 Sr-Sm-Nd isotopic compositions rocks, 993 U-Pb zircons ages, and 202 Lu-Hf zircon isotope data. Jurassic units are dominated by Brazilian/Pampean Grenville/Sunsas have juvenile to evolved Hf Permian zircons. These consistent with an Easte...

The Kopet Dagh mountains in NE Iran exhibit a 7-km-thick continuous sedimentary sequence recording detritus from exposed surrounding terranes the last 175 Ma. This work presents multi-disciplinary geochronologic and provenance analysis an attempt to identify date major geologic events along northern segment of Tethys reconstruct regional tectonic history Gondwana-related rifting until Alpine or...

Abstract The Abu Ghalaga pluton in the southern eastern desert of Egypt (SED) consists undeformed norite and hornblende gabbro intruding island arc metavolcanics, ophiolitic rocks, syn-tectonic older granitic rocks. Fe-Ti ore (mainly ilmenite) occurs form lenses at base norite. Based on microtextures, mineralogy, chemical composition, three types ilmenites are recognized: massive high-Mg type, ...