Инд. авторы:	Safonova I., Perfilova A., Obut O., Kotler P., Aoki S., Komiya T., Wang B., Sun M.
Заглавие:	Traces of intra-oceanic arcs recorded in sandstones of eastern Kazakhstan: implications from U-Pb detrital zircon ages, geochemistry, and Nd-Hf isotopes
Библ. ссылка:	Safonova I., Perfilova A., Obut O., Kotler P., Aoki S., Komiya T., Wang B., Sun M. Traces of intra-oceanic arcs recorded in sandstones of eastern Kazakhstan: implications from U-Pb detrital zircon ages, geochemistry, and Nd-Hf isotopes // International Journal of Earth Sciences. - 2022. - ISSN 1437-3254. - EISSN 1437-3262.
Внешние системы:	DOI: 10.1007/s00531-021-02059-z; WoS: 000663493400003;
Реферат:	eng: This paper presents first U-Pb detrital zircon ages, major and trace element geochemical data and whole-rock Nd and Hf-in-zircon isotope data from sandstones of the Char and Zharma zones of eastern Kazakhstan. Petrographically the sandstones represent greywackes. The U-Pb ages of detrital zircons show unimodal distributions peaked at 345-340 and 330-325 Ma indicating post-Early Carboniferous deposition. The sandstones have high CIA values (60-68), suggesting moderate to weak chemical weathering. Their high ICV values (1.1-1.3) and relatively high MgO and low Y, Nb indicate an immature probably mafic-intermediate igneous source (low La/Th, medium Hf). Positive whole-rock epsilon Nd-(t) and zircon epsilon Hf-(t) indicate dominantly juvenile character of igneous rocks in the provenance. In total, the unimodal character of U-Pb detrital zircon age patterns, the chemical composition of sandstones similar to that of associated volcanic rocks and the positive values of epsilon Nd-(t) and epsilon Hf-(t) suggest their derivation from one or more intra-oceanic arcs. The data from eastern Kazakhstan fit those obtained from late Paleozoic greywacke sandstones of NW China. The new geochemical and geochronological data from sandstones and published data from oceanic and supra-subduction ophiolites of eastern Kazakhstan suggest an extended Pacific-type subduction system in the western Paleo-Asian Ocean in Devonian-early Carboniferous time.
Ключевые слова:	Char zone; Zharma zone; MAGMATISM; EVOLUTION; SEDIMENTARY; ELEMENT; GORNY ALTAI; ALTAI OROGEN; PLASMA-MASS SPECTROMETRY; CONTINENTAL-CRUST FORMATION; ASIAN OROGENIC BELT; OCEAN PLATE STRATIGRAPHY; U-Pb zircon geochronology; Central-Asian orogenic belt; Arc-derived sediments; Paleo-Asian Ocean;
Издано:	2022