Evolution of supracrustal rocks of the Indochina Block: Evidence from new detrital zircon U–Pb ages of the Kontum Massif, Central Vietnam

The Kontum Massif and the Truong Son Belt, central Vietnam are magmatic–metamorphic massifs (belts) of Indochina Block. These two underwent independent orogenic events during Ordovician–Silurian Permian–Triassic ages. However, due to strong overprint these events, evidence any preexisting (e.g., Precambrian) tectono–thermal have become extremely poor. Hence, Precambrian age components Block not been fully revealed, their implication is well–understood. It well known that such ‘lost memories’ older continental rocks or source crustal materials sometimes preserved in sedimentary basins. Keeping goal mind, we investigated LA–ICP–MS detrital zircon U–Pb dating for three metasedimentary southern part Block, unravel episodes if any. Two Triassic (meta)–sedimentary reveal significant clusters latest Carboniferous (~ 300–230 Ma) Early Paleozoic 480–410 Ma), with conspicuous lack 400–320 Ma grains. Abundant Permian grains metaquartzite from document subduction–related magmatism before collision played an important role growth Massif. In contrast rocks, spectra show most peak ~ 1780 abundant Archean (16%). Furthermore, oldest shows Paleoarchean (207Pb/206Pb spot 3314 ± 22 Ma). was metamorphosed 414 youngest grain yields 207Pb/206Pb 1359 85 Ma. approximate depositional timing protolith Mesoproterozoic time. newly obtained data indicate a contribution Paleoproterozoic deposition quartzite had developed as different unit period Belt southwestern Yangtze provenance. This study reveals new clue one blocks Southeast Asian massifs.