No abstract

No abstract

Clearly, our submission is a significant clearance to Ma et al.'s work and the Tibetan Plateau geology and of timely significance in correctly understanding the evolution history of the Tibetan Plateau. Therefore, our paper possibly is of broad interest to our international colleagues.

No abstract

No abstract

No abstract

No abstract

The nature of the Namco-Renco ophiolites in the northern Lhasa subterrane is widely disputed. To investigate their formation age, petrogenesis, and tectonic setting, the harzburgites, basalts, and metagabbros of the Namco ophiolite and the harzburgites, lherzolites, gabbros, and diabasic dikes of the Renco ophiolite were selected for whole-rock geochemical and zircon U-Pb dating and in situ Lu-Hf isotopic analyses. The geochemical and geochronological data indicate that the Namco metagabbros were generated at 178.0 ± 2.9 Ma, along with the Namco-Renco peridotites formed in the initial stage of a continental margin basin; whereas the Renco gabbros were developed at 149.7 ± 1.6 Ma, along with the Renco diabasic dikes and Namco basalts formed later in a mature back-arc basin. The Namco-Renco ophiolites were derived from a depleted mantle source with involvement of minor older crustal materials. Combined with the regional geological background, the Namco-Renco ophiolites were likely formed mainly associated with the southward subduction of the Bangong-Nujiang oceanic lithosphere beneath the Lhasa terrane. This study provides new constraints on the formation ages of the Namco-Renco ophiolites and the tectonic evolution of the Namco-Renco Ocean.