Short-lived intra-oceanic arc-trench system in the North Qaidam belt (NW China) reveals complex evolution of the Proto-Tethyan Ocean
نویسندگان
چکیده
Abstract Recognition of any intra-oceanic arc-trench system (IOAS) could provide invaluable information on the tectonic framework and geodynamic evolution vanished ocean basin. The Tanjianshan Complex mafic-ultramafic rocks along North Qaidam ultra-high pressure metamorphic belt in NW China record subduction process Proto-Tethyan Ocean. Four lithotectonic units, including island arc, ophiolite, forearc basin, accretionary complex, are recognized based detailed field investigation. They rest northern margin block occur as allochthons fault contact with underlying high-grade rocks. ophiolite unit mainly consists ultramafic rocks, 527–506 Ma gabbro, 515–506 plagiogranite, dolerite, massive lava. High-Cr spinels serpentinite, dolerite basalt affinity, boninitic lava collectively indicate a setting. exposed to south complex is highly disrupted contains repeated slices basalt, 495–486 tuff, chert, limestone, mélange. Tuffs positive zircon εHf(t) values derivation from nearby juvenile arc. These well back-arc interpreted constitute Cambrian IOAS that formed during northward Combined regional geology, we propose new model involving short-lived Mariana-type prolonged Andean-type account for reconstruction relatively complete not only reveals systematic but also advances our understanding accretion history
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ژورنال
عنوان ژورنال: Geological Society of America Bulletin
سال: 2021
ISSN: ['1943-2674', '0016-7606']
DOI: https://doi.org/10.1130/b36127.1