TY - DATA T1 - Devonian arc-related magmatism in the Tseel terrane of SW Mongolia: chronological and geochemical evidence PY - 2016/06/21 AU - Antoine Demoux AU - Alfred Kröner AU - Ernst Hegner AU - Gombosuren Badarch UR - https://geolsoc.figshare.com/articles/dataset/Devonian_arc-related_magmatism_in_the_Tseel_terrane_of_SW_Mongolia_chronological_and_geochemical_evidence/3454616 DO - 10.6084/m9.figshare.3454616.v1 L4 - https://ndownloader.figshare.com/files/5426465 L4 - https://ndownloader.figshare.com/files/5426468 L4 - https://ndownloader.figshare.com/files/5426471 L4 - https://ndownloader.figshare.com/files/5426474 KW - source KW - arc KW - mafic metavolcanic rocks KW - Ma KW - geochemical KW - Nd KW - Precambrian crustal components KW - Tseel terrane KW - felsic metaigneous rocks KW - middle Palaeozoic age KW - SW Mongolia KW - Devonian KW - data KW - Geology N2 - The Tseel terrane in the Gobi Desert of SW Mongolia consists of a composite crustal segment of imbricated sheets of high- and low-grade metamorphic rocks of predominantly middle Palaeozoic age. New sensitive high-resolution ion microprobe (SHRIMP) zircon ages of 396 ± 3 Ma (2σ) and 397 ± 3 Ma (2σ) for two calc-alkaline metarhyolite samples indicate arc volcanism during the early Devonian. An undeformed feldspar porphyry cross-cutting the early Devonian low-grade sequence yielded an emplacement age of 279 ± 2 Ma (2σ). Geochemical and Nd isotopic data for low-grade mafic metavolcanic rocks are consistent with melting of moderately depleted upper mantle sources in a transitional arc–back-arc setting. In addition, there are high- and low-grade felsic metaigneous rocks with subduction-related chemical signatures and heterogeneous Nd isotopic compositions indicating an origin from mixed sources, including juvenile and Precambrian crustal components. The field observations combined with the geochemical and isotopic data suggest that the Tseel terrane represents a segment of a mature Japan-type arc associated with a juvenile back-arc basin. ER -