Early Cambrian ophiolites from the Alambay zone and the formation age the Salair sector of the Kuznetsk–Altai paleo-island arc system (northwestern Altai–Sayan folded area)

Research subject. The Alambay ophiolite zone of the Salair Ridge (northwestern Altai–Sayan folded area, Central Asian Orogenic Belt), belonging to SSZ-type ophiolites. Aim. Determination of the formation age of magmatic rocks in the ophiolite zone. Establishing the age of the paleo-subduction zone initiation and the associated paleo-island arc system. Materials and methods. Zircons from plagiogranite (54°3’50.44” N, 85°45’0.22” E) and gabbro (54°0’46.67” N, 85°47’3.11” E) samples of the Upper Alambay gabbro-hyperbasite massif were dated using LA-ICP-MS on an Agilent 7900 quadrupole mass spectrometer at the Joint Innovation Center for Strategic Mineral Resources Exploration, School of Earth Resources, China University of Geosciences (Wuhan). Results. The weighted mean ²⁰⁷Pb/²⁰⁶Pb age of zircons from the plagiogranite sample (based on 18 analyses with common Pb correction) was 532.2 ± 3.9 Ma (MSWD = 0.84). The corresponding age for the gabbro sample was 530.6 ± 2.7 Ma (MSWD = 0.91). Conclusion. The suprasubduction ophiolites of the Alambay zone (Salair Ridge) formed in the Early Cambrian (≈530 ± 3 Ma). The subduction initiation in this sector of the Paleo-Asian Ocean can be estimated at ≈535–540 Ma. This age serves as a lower constraint for the formation of island-arc volcanic complexes in the Salair sector. Older rock assemblages in the region may represent accreted blocks to the Cambrian arc, likely located southwest of the Alambay zone. Volcanic arc complexes to the east should be younger, consistent with available data.

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