Geochemical and Nd–Hf isotopic constraints on the origin of the ~ 1.74-Ga Damiao anorthosite complex, North China Craton

摘要: Abstract The ~ 1.74-Ga Damiao complex in the North China Craton consists of anorthosite (85%), norite (10%), mangerite (4%) and minor troctolite (  75%) would have been required to form parental high-Al gabbroic magma from lower crust. We propose that crustal rocks were dragged into upper mantle during amalgamation Craton, where ambient temperature was high enough (> 1271 °C at 12 kbar) cause extensive melting, producing a deep-seated chamber. melt then evolved through polybaric crystallization, anorthositic magmas with abundant suspended plagioclase finally injected mid-crustal depth complex.