地质学报2025，Vol.99Issue(6)：1947-1963,17.DOI:10.19762/j.cnki.dizhixuebao.2025108
鲁西地区新太古代晚期高镁玄武岩-安山岩成因及地质意义
Petrogenesis and geological significance of late Neoarchean high-Mg basalt-andesites in western Shandong Province
摘要
Abstract
Understanding the complex and diverselate Neoarchean mantle-derived magmatism in western Shandong of the eastern North China craton(NCC)is crucial for deciphering the dynamic mechanism of early crustal formation and evolution.In this study,field investigation,petrology,whole-rock geochemistry,and zircon U-Pb isotopic results are reported for late Neoarchean(2.55～2.53 Ga)metabasalt-andesites from western Shandong.These rocks are characterized by high MgO(＞8％)and low TiO2(＜0.61％),with enrichments in light rare earth elements(LREE)and large ion lithosphere elements(LILE).They exhibit(La/Yb)N ratios ranging from 5.36 to 11.35 and(Gd/Yb)N ratios from 2.02 to 3.96,alongside high Cr(274×10-6～753×10-6)and Ni(133×10-6～364×10-6)concentrations,classifying them as high-Mg basalt-andesite.Petrogenesis studies reveal derivation from a depleted mantle source metasomatized by subduction processes.The presence of these high-Mg basalt-andesites,together with contemporaneous sanukitoids and calc-alkaline basalts in western Shandong,collectively points to significant subduction during the late Neoarchean.This implies that modern-style plate tectonics,including slab rollback,may have been operating during the late Archean.关键词
华北克拉通/鲁西地区/新太古代/幔源岩浆作用/板块构造Key words
North China craton/western Shandong/Neoarchean/mantle-derived magmatism/plate tectonic引用本文复制引用
于洋,李大鹏,陈岳龙,李三忠,孙国正,张超..鲁西地区新太古代晚期高镁玄武岩-安山岩成因及地质意义[J].地质学报,2025,99(6):1947-1963,17.基金项目
本文为国家自然科学基金项目(编号 42302224,42173047,42202220)、山东博士后科学基金(编号 SDCX-ZG-202400170)、山东省自然科学基金青年基金项目(编号 ZR202111290393)和海底科学与探测技术教育部重点实验室开放课题基金(编号 SGPT-2023OF-09)联合资助的成果. （编号 42302224,42173047,42202220）
