Accretionary tectonics of the Cambrian-early Ordovician HP/UHP mélange in the Kokchetav terrane (North Kazakhstan): insights for an intra-oceanic subduction
Description
The dataset concerns the zircon U-Pb geochronology data (Supplementary table 1), Whole-rock major-trace geochemistry data (Supplementary table 2) and Whole-rock Sr-Nd-Hf isotopic geochemistry data (Supplementary table 3) of the HP/UHP mélange in the Kokchetav terrane in the western Altaids (North Kazakhstan). The data enables construction of a new tectonic evolution model concerning subduction and exhumation of the HP/UHP metamorphic rocks of the Kokchetav terrane. This study sheds light on the subduction-exhumation dynamics and tectonic evolution of the western Altaids. Among them, Supplementary table 1: Whole-rock major and trace element data from the Kokchetav HP/UHP mélange; Supplementary table 2: LA-ICP-MS U-Pb data of the metabasites/metasediments samples from the Kumdy-kol region of the Kokchetav HP/UHP mélange; Age discordance is reported by (207Pb/235U age)/(206Pb/238U age)*100 if 206Pb/238U age is <1000 Ma, otherwise by (207Pb/206Pb age)/(206Pb/238U age)*100, if older. Ages with discordance between 90 and 100 were determined by 206Pb/238U, if younger than 1000 Ma, otherwise by 207Pb/206Pb age, if older. The results with discordance greater than 10% are marked. Detailed analytical method of zircon U-Pb dating is presented in the main text. Supplementary table 3:Whole-rock Rb-Sr, Sm-Nd, Lu-Hf isotope analyses data of the metamafic/mafic rocks from the Kokchetav HP/UHP mélange; Detailed analytical methods of zircon U-Pb dating, Whole-rock major-trace elements and Rb-Sr, Sm-Nd, Lu-Hf isotopes are presented in the main text.
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Based on the previous regional geological investigations in Kumdy-Kol region of the Kokchetav HP/UHP mélange, selected representative field locations for detailed sample collection. In total, fourteen samples of metabasite rocks were collected for whole-rock major and trace element, nine of them were analyzed for Sr-Nd-Hf isotopic composition. In addition, six metabasite and four metasedimentary rocks were conducted for LA-ICP-MS zircon U-Pb dating.