Understanding the factors that contribute to U^Pb discordance in zircon is essential for interpreting isotopic data and for assessing the validity of concordia intercept ages. Modification caused by interaction with metamorphic fluids is often cited as a primary means by which significant or even complete isotopic resetting of U^Pb systematics in zircon might be achieved under subsolidus condit...

Abstract Systematic changes in whole-rock chemistry, mineralogy, mineral textures, and chemistry are seen along a ca. 95-km traverse of late Archean granitoid orthogneisses the Shevaroy Block, Eastern Dharwar Craton, southern India. The passes from amphibolite-grade gneisses north to granulite-grade rocks (charnockite) south. Changes include depletion Rb, Cs, Th, U granulite grade as relative a...

The Paramirim Aulacogen was filled by the Espinhaço and São Francisco supergroups in period from 1.75 to 0.69 Ga, suffered partial inversion during Ediacaran. In northern sector of intracontinental domain Araçuaí-WestCongo Orogen, six compressive deformational phases were interpreted associated with frontal Aulacogen. Three structural domains identified: Jacaraci Fold-Thrust Belt, Caetité Nappe...

The Marun–Keu complex (Polar Urals, Russia) is a poorly known member of a group of high P complexes outcropping along the length of the Uralide orogen. The central and southern parts of the complex are metamorphosed at high P, medium T conditions (Tmaxf600–650 jC and Pf14–17 kbar) and differ from its northern part and the rest of the Uralian high P complexes which are metamorphosed at blueschis...

The Ciletuh Mélange Complex in West Java, Indonesia, provides evidence of early Cenozoic subduction. This study aims to investigate the stratigraphic position, geological structure, metamorphic facies, and protoliths rock units. research methods employed mapping, petrology, geochemical analysis. samples collected exhibit different including zeolites, greenschist, epidote amphibolite. Protoliths...

Abstract Continental arcs in active continental margins (especially deep-seated arc magmatism, anatexis, and metamorphism) can be extremely significant evaluating continent building processes. In this contribution, a Paleozoic section is constructed based on coeval granulite-facies metamorphism, magmatism the northern margin of Qilian Block, which record two episodes crust growth. The deeper la...