Early Paleozoic mafic magmatic events on the eastern margin of the Siberian Craton

摘要: Neoproterozoic and Devonian mafic flows, sills dykes associated with synchronous rifting events are widely distributed along the long-lived Mesoproterozoic to Mesozoic passive eastern margin of Siberian Craton. Early Paleozoic magmatic also present, but poorly studied, including Cambrian volcanic rocks in Kharaulakh Range ca. 450 Ma age intrusions Suordakh event Sette–Daban Range. Both suites early characterized by high Ti concentrations (> 3 wt.% TiO2), ocean island basalt (OIB)-type trace element rare earth (REE) patterns, eNd(t) values that generally vary between 6 9. The magmas were formed during low degree partial melting an enriched region mantle at depths > 90 km, generating a suite alkaline basalts. In comparison, higher less < 90 km, forming subalkaline suggestive interaction depleted both emplaced within-plate tectonic settings. Although have relatively small areal extents, significant parts them likely hidden below clastic Lower Carboniferous–Jurassic Verkhoyansk Complex. may counterparts Canadian Cordillera, together could be sufficient scale define Large Igneous Province (LIP). study area locally terrigenous units ranges, suggesting this magmatism was related event. Modeling sedimentary basin subsidence is supportive However, intrusive not any rift-related sediments or structures. Contemporaneous granites interpreted as silicic LIP