Neoarchean-Paleoproterozoic tectonic evolution of the southern margin of the North China Craton: Insights from geochemical and zircon U-Pb-Hf-O isotopic study of metavolcanic rocks in the Dengfeng complex

摘要

Neoarchean magmatic rocks are widespread in the North China Craton (NCC). But the tectonic setting of these Neoarchean rocks is still controversial. The Dengfeng Complex in the southern segment of the NCC contains a typical suite of early Precambrian metamorphic rocks including massive Neoarchean metavolcanic rocks, which are important recorders of the early geodynamic setting and crustal evolution of NCC. In this study, we examine the geochemical and zircon U-Pb-Hf-O isotopic signatures of the Neoarchean metavolcanic rocks (amphibolite, biotite leptynite and leptite) from the Dengfeng Complex, with a focus on rocks from the understudied Jishan area together with rocks from the Songshan area for comparison, to constrain the petrogenesis of these rocks and further infer the geochronological framework, tectonic setting and crustal evolution of the southern NCC.