The petrogenesis of related magmatism at Middle Paleoproterozoic is of great importance considering the controversial issue of tectonic setting and evolution of the North China Craton. In this paper, we present comprehensive analyses on the meta-basic volcanic rocks from Jinzhouying Formation of Lüliang Group in the Lüliang complex. LA-ICP-MS zircon U-Pb dating on the meta-basic volcanic rock yields the age of 2 180±19 Ma. The meta-basic volcanic rocks are of calc-alkaline series, with low TiO2and high Al2O3 , K2O. They are relative enrichment in large ion lithophile elements（Rb, Ba, Th, U, Sr）, high in Pb and depletion in high field strength elements （Nb, Ta, Ti, P）. REE patterns are of slightly right inclined type with unobvious Eu and Ce anomaly. All above are similar to the typical arc volcanic rocks in the subduction zone. The rocks also show positive εNd（t）= 1.0～2.6 and εHf（t）= 1.8～9.2, which imply that they may derived from the depleted mantle. The low Ti/Y（246～385）and Ce/Y （0.99～1.77） further reveal that the mantle wedge is commonly modified by addition of materials from fluids and subducted sediments. Thus, the rocks may originated from part melting of depleted mantle in the transition zone between spinel and garnet lherzolites and then exist crystallization fractionation of olivine, clinopyroxene. Combined with the close spatial and temporal association of the suite of adakitic rocks, Nb-enriched basalts, andesites, magnesian andesites and arc-related granitoids, we suggest an 2 200 Ma active continental marginal system in the Trans-North China orogen.
Zhao Jiao Zhang Chengli Liu Xinyu Guo Xiaojun. Protolith age and geochemical characteristics of meta-basic volcanic rocks from Lüliang Group in the Lüliang complex and its tectonic setting[J]. Chinese Journal of Geology, 2017, 52(4): 1220-1240.