Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6433507 | Tectonophysics | 2015 | 12 Pages |
â¢The majority of material in the XMOB is juvenile.â¢The Solonker-Linxi suture marks the final closure location.â¢Double-sided subduction of the PAO occurring during the Late Paleozoic.
Zircon U-Pb dating and whole-rock geochemical data for Carboniferous-Permian (meta-) sedimentary sequences, igneous rocks, and Precambrian amphibolite in the eastern Xing-Meng Orogenic Belt (XMOB) were used to constrain the final stage evolution and the position of closure of the Paleo-Asian Ocean (PAO). Detrital zircons from Late Paleozoic strata range in age from Archean to Late Paleozoic, with major age groups at ~Â 1.0-0.7Â Ga and ~Â 0.5-0.25Â Ga in the northern part and at ~Â 2.7-2.5Â Ga, ~Â 2.1-1.8Â Ga, and ~Â 0.5-0.25Â Ga in the southern part of the XMOB. Striking changes in zircon age distribution patterns indicate inputs to these strata were separated by the Paleo-Asian Ocean (PAO) in the Late Paleozoic. The PAO closed along the Solonker-Linxi suture. The Late Paleozoic formation ages (~Â 346Â Ma, ~Â 303Â Ma, and ~Â 269Â Ma) of the igneous rocks with arc-like geochemical features south to the PAO, together with previously published data on the regional igneous rocks and ophiolites, indicate double-side subduction of the PAO in the Late Paleozoic.