U-Pb Ages and Lu-Hf Isotopic Characteristics of Detrital Zircons for Li-Rich Aluminous Argillite and Their Constraints to the Lithium Source in the Mazongling Bauxite Deposit,Northern Guizhou Province
U-Pb Ages and Lu-Hf Isotopic Characteristics of Detrital Zircons for Li-Rich Aluminous Argillite and Their Constraints to the Lithium Source in the Mazongling Bauxite Deposit,Northern Guizhou Province
In order to determine the provenance system of Li-rich aluminous argillite and its source of lithium in the Mazongling bauxite deposit,northern Guizhou,LA-ICP-MS U-Pb micro-dating,Lu-Hf isotope and trace elements analysis of detrital zircons of Li-rich aluminous argillite in the top of the Dazuyuan Formation were conducted.Detrital zircons generally show magmatic oscillating zonation,and are magmatic zircons related to orogenic/arc interactions.U-Pb ages of detrital zircons distributions appear to be from the Early Devonian to Archean(411～3001 Ma),with two main clusters at 627～879 Ma,925～1018 Ma and one minor cluster at 539～602 Ma.εHf(t)values of detrital zircons vary from-27.61 to 7.03 with two-stage Hf model ages(tDM2)of 1242～3387 Ma.Based on the above results,it is considered that the primary provenance of detrital zircons is the Neoproterozoic magmatic rocks in the Nanling-Yunkai terrane and western segment of the Jiangnan Orogen.The lithium in the Li-rich aluminous argillite may have come from the basic rock of 860～750 Ma in the northern Guangxi-eastern Guizhou region of the western part of Jiangnan Orogen.
关键词
富锂铝质粘土岩/碎屑锆石/Lu-Hf同位素/U-Pb年龄/马鬃岭铝土矿/贵州北部地区
Key words
Li-rich aluminous argillite/detrital zircon/Lu-Hf isotope/U-Pb age/Mazongling bauxite mine/northern Guizhou Province
维普
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