Geochemical and zircon geochronological study on the meta-mélange belt in the Kokchetav region (North Kazakhstan): Implications for the early Cambrian to early Ordovician seamount accretion
Description
The manuscript deals with the zircon U-Pb geochronology data (Supplementary table 1), Whole-rock major-trace geochemistry data (Supplementary table 2) and Whole-rock Nd isotopic geochemistry data (Supplementary table 2) of Kokchetav meta-mélange belt in the western Altaids (North Kazakhstan). A new tectonic evolution model concerning subduction and exhumation of the HP/UHP metamorphic rocks has been proposed according to these data, which sheds light on a better understanding the tectonic evolution of the North Kazakhstan before its bending to form the Kazakhstan orocline, as well as the paleogeography in the western Altaids. Among them, Supplementary table 1: Whole-rock major and trace element data from the Kokchetav accretionary complex; Supplementary table 2: LA-ICP-MS U-Pb data of themetamafic/metasedimentary samples from the Kumdy-kol region of the Kokchetav accretionary complex; 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 Sm-Nd isotope analyses data of the metamafic/mafic rocks from the Kokchetav accretionary complex; Detailed analytical method of zircon U-Pb dating is presented in the main text.
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Based on the previous regional geological investigations, selected representative field locations for detailed sample collection. In total, fourteen samples of meta-mafic rocks and two samples of metasedimentary matrix samples from the Kumdy-kol region and additional four samples of meta-mafic/basaltic rocks from the key parts of the Chalingka, Kulet and Zhanatalap regions were collected for LA-ICP-MS zircon U-Pb dating, whole-rock major and trace element and Nd isotopic analyses.