Furnes et al. (1) reported that a sheeted-dike complex they identified within the ~3.8billion-year-old Isua supracrustal belt (ISB) in Greenland provides the oldest evidence of oceanic crustal accretion by spreading. However, they did not alert readers that the ISB contains supracrustal rocks and mafic dikes of different ages (2, 3). They also failed to demonstrate that the proposed components ...

Abstract The punctuated distribution of major gold deposits along orogenic belts is poorly understood. In northern Perú, cluster trends that transect the subparallel Phanerozoic accreted onto western margin Archean–Proterozoic Amazonian craton. This suggests influence as yet unrecognized pre-Andean basement structures in controlling localization deposits. We report newly discovered Tomac ophiol...

Abstract New zircon U-Pb geochronology from a peridotite suite near Ranau and the Telupid ophiolite in Sabah, eastern Malaysia, contradict previous studies, which assumed that Sabah mafic-ultramafic rocks are largely ophiolitic Jurassic–Cretaceous age. We show these formed during magmatic episode Miocene (9.2–10.5 Ma), is interpreted to reflect infiltration of melts melt-rock reaction subcontin...

The Shiquanhe–Laguoco–Yongzhu–Jiali ophiolite mélange belt in Tibet includes the Laguoco Tso as part of its western segment. Researchers studying evolution Tibetan Plateau and Tethys have taken a keen interest debated relationship between this Bangong–Nujiang belt. However, there is little research field. This study reports rock geochemistry, SIMS (the secondary ion mass spectrometry) zircon U-...