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Geochemical and Zircon hf-o Isotopic Constraints on the origin of Wulian A-Type Granite in Shandong Peninsula,Eastern China

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Journal of Earth Science 2022年第3期33卷 609-622页

作者： Shuai Yuan He Li Lipeng Zhang Congying Li Haiyang Liu Ying-Yu Xue Weidong Sun Center of Deep Sea Research Institute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China School of Marine Sciences University of Chinese Academy of SciencesBeijing 100049China

Early Cretaceous A-type granitic plutons are widely distributed in Shandong Peninsula,which are of great significance to understanding the regional tectonic *** we report geochemical characteristics,geochronological results,and zircon hf-o isotope compositions of Wulian granites to reveal its origin and geological *** granites share most characteristics of the A_(2)-type *** U-Pb LA-ICPMS analysis for Wulian A-type granites yields average age of 116.6±2.1 *** o isotope values range from 4.20‰to 5.57‰,and these values are marginally identical to or slightly lower than those of mantle zircon(5.3‰±0.3‰).Zirconε_(hf)(t)values(-26.1--23.5)indicate an enriched *** zircon hf-o isotope compositions indicate that the source region of Wulian granites involves the components of ancient oceanic *** from Wulian granites have the lower chlorine(0.06 wt.%-0.15 wt.%)and higher fluorine contents(2.11 wt.%-2.48 wt.%)compared with Haiyang pluton,together with their high(La/Gd)_(N),(La/Yd)_(N) and low(Gd/Yb)_(N) ratios and high oxygen state magma reflected from zircon,signifying that slab derived component was added into the overlying mantle region through fluid/*** geochemical characteristics of Wulian granites could be explained by the ridge(between the Izanagi and Pacific plates)subduction model,which began to influence the tectonic evolution of the Xuhuai region and Shandong Peninsula since~130±5 *** following slab window between two plates plausibly explains regional extension,resulting in hot magma upwelling and the formation of the A-type granite *** the Lower Yangtze River belt and Shandong Peninsula A-type granite proves the northward movement of the ridge between the Pacific Plate and Izanagi Plate.

关键词： A-type granite Shandong Peninsula ridge subduction zircon hf-o isotope magma

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