Neoproterozoic and Early Paleozoic magmatism in the eastern Lhasa terrane: Implications for Andean-type orogeny along the northern margin of Rodinia and Gondwana

Precambrian and Early Paleozoic magmatic activities in the Lhasa terrane provides important context for distinguishing between North South terranes, deciphering nature geotectonic history of northern margin Rodinia Gondwana supercontinents. Here, we conducted a detailed petrological, geochemical, geochronological study mafic to granitic meta-intrusive rocks Bomi complex eastern segment terrane. Zircon U–Pb dating indicates that these record Neoproterozoic Cambrian events, with protolith crystallization ages ca. 805 Ma, 505 503 Ma dioritic gneisses, amphibolites (meta-gabbros), respectively. These were later metamorphosed during Late Jurassic, zircon 158 obtained from amphibolites. All are enriched Rb, U LREEs, depleted Nb, Ta, Sr HREEs, showing affinity arc-related magmas. With positive ?Hf(t) values +1.4 +6.9, gneisses interpreted have formed by fractional mantle-derived –3.0 +6.0, differing those coeval (+0.3 +3.2). been derived partial melting continental lithospheric mantle contamination subducted sediments, whereas probably originated anatexis lower crust was induced emplacement magma. be arc setting. When comparing data other blocks, propose distinctive basements. The diachronically witnessed an Andean-type orogeny along northwestern northeastern Paleozoic.