2021 Vol. 54, No. 3
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LIU Guiping, GUO Ruiqing, WEI Zhen, SUN Minjia, CUI Tao, WU Huanan, SONG Zhihao. 2021. Geochemical Characteristics and Significance of the Whole Rock Sr-Nd and Zircon Hf Isotopic in the Paleozoic Granite-plutons in Kuruktag, Xinjiang. Northwestern Geology, 54(3): 39-50. doi: 10.19751/j.cnki.61-1149/p.2021.03.004
Citation: LIU Guiping, GUO Ruiqing, WEI Zhen, SUN Minjia, CUI Tao, WU Huanan, SONG Zhihao. 2021. Geochemical Characteristics and Significance of the Whole Rock Sr-Nd and Zircon Hf Isotopic in the Paleozoic Granite-plutons in Kuruktag, Xinjiang. Northwestern Geology, 54(3): 39-50. doi: 10.19751/j.cnki.61-1149/p.2021.03.004

Geochemical Characteristics and Significance of the Whole Rock Sr-Nd and Zircon Hf Isotopic in the Paleozoic Granite-plutons in Kuruktag, Xinjiang

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  • The Baihaizi pluton is typical Paleozoic granitic intrusive rock in Kuruktag area.A deep understanding of the petrogenesis and the source material of the rock is of great significance to the study of the tectonic setting and Paleozoic crustal evolution in this area. This paper studied the whole rock Sr-Nd, zircon Hf isotope and zircon trace elements of the Baihaizi pluton.The isotopic results indicate that the rocks have the intitial medium value of ISr (0.710 01~0.712 87), with the negative εNd(t) (-21.01~-18.07) and negative εHf(t) (-26.55~-17.28) values. The corresponding Nd two stage mode age (TDM2) and Hf mode age (TDMC) range from 2.60 Ga to 2.84 Ga and from 2.43 Ga to 3.00 Ga, respectively, indicating that it is the product of the recycling of crustal materials from the early Paleoproterozoic to the Neoarchean.The zircon trace element analysis shows that the zircons are magmatic crust zircons, with an average TZr=745℃ and TTi=692℃.The "cold" magma formed in the active continental margin and it was the product of the southward subduction of the south Tianshan ocean to the lower part of the Tarim Craton in the late stage. Many Paleozoic granitic intrusive rocks have been found in the Kuruktag area, the εNd(t) value and zircon εHf(t) value increase first and then decrease with a reduction of age.Combined with the previous data, it is held that crustal evolution in the Kuruktag area experienced a thin-to-thick process in the subduction of the south Tianshan ocean to the Tarim block during the Ordovician-Early Carboniferous.
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