Geochronological Framework and Geodynamic Implications of Mafic Dykes in the Liaodong Peninsula, North China Craton

nuclei on Earth, is bounded to the north by the Central Asian Orogenic Belt and to the south by the Qinling– Dabie ultrahigh-pressure metamorphic belt. The Liaodong Peninsula is located on the northeastern margin of the North China Craton. The late Archean–Paleoproterozoic basement of the Liaodong Peninsula is overlain by unmetamorphosed Mesoproterozoic–Cenozoic cover rocks. Mafic dykes are widespread on the Liaodong Peninsula (Fig. 1). The majority of thess dykes were originally thought to have occurred during the Pre-Sinian, although the precise geochronological framework of this magmatism was unclear. More than 50 U–Pb analyses of dyke samples were performed over the past decade, with the aim of determining the spatial and temporal distribution of mafic dykes in this area. These data indicate that Paleoproterozoic–Mesoproterozoic mafic rocks are not as widely distributed as previously thought. The combined geochronological data enabled the subdivision of the mafic dykes into six episodes that occurred during the middle Paleoproterozoic, the late Paleoproterozoic, the Mesoproterozoic, the Late Triassic, LI Zhuang, CHEN Bin, 2016. Geochronological Framework and Geodynamic Implications of Mafic Dykes in the Liaodong Peninsula, North China Craton. Acta Geologica Sinica (English Edition), 90(supp. 1): 76-77.