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ObjectivernLate Paleozoic supra-subduction zone (SSZ)-type ophiolites and intra-oceanic arc igneous petrotectonic assemblages are developed in the Erenhot—Hegenshan suture zone (EHSZ) in the east part of the Central Asian Orogenic Belt (CAOB),which contains information about the Late Paleozoic tectonic evolution of the PaleoAsian Ocean (PAO) in the east CAOB.