Evolution of the Indochina block from its formation to amalgamation with Asia: Constraints from protoliths in the Kontum Massif, Vietnam

摘要: Abstract This study reported the U-Pb ages and Hf isotopes of zircons Triassic Silurian metamorphic rocks in Kontum Massif, central Vietnam to understand origin evolution Indochina Block. The detrital zircon signature metasedimentary corresponds Neoproterozoic sequence Block that Paleo- Mesoproterozoic southwestern margin Yangtze From metaigneous rocks, we obtained three meaningful inherited ages; ~1450 Ma, 500 Ma, 450 Ma. occur close association with felsic gneiss mafic granulite (former eclogite) magmatic ~1450 Ma intermediate ~500 Ma protolith age. suggest age as earlier or primary stage formation timing its reworking, before block subducted beneath South China form eclogite relicts. Ordovician (~450 Ma) from combined their volcanic arc whole-rock chemistry, Ordovician–Silurian low-pressure/high-temperature isobaric heating metamorphism, strongly an continental present prior collision.