2021/07/27 by Mingyue Gong, Wei Tian, Zhuang Li +2 · 4 citations
Earth and Planetary Sciences · #Craton #Eclogite #Facies #Geochemistry #Geological and Geochemical Analysis #Geology #Geomorphology #Granulite #High-pressure geophysics and materials #Mantle (geology) #Mantle wedge #Metasomatism #Olivine #Paleontology #Peridotite #Petrology #Subduction #Tectonics #Zircon #earthquake and tectonic studies
paper · doi:10.1017/s0016756821000571
published in Geological Magazine 158(12), 2115-2138 (Cambridge University Press)
openalex publication_date 2021/07/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Abstract The Songling and Majiayu peridotite blocks occur in the Eastern Block, North China Craton (NCC). Geothermobarometry data show that the Songling peridotites began exhumation from a depth of c. 70 km ( c. 23 kbar). During exhumation, the Songling peridotites were intruded by an upper-crust-derived, high-δ 18 O (up to +7.28‰ in zircon) trondhjemitic dyke at 2.47 Ga and experienced granulite-facies metamorphism. The Songling peridotites have hybrid mantle wedge (HMW) -like high SiO 2 (> 45 wt%), high FeOt ( c. 10 wt%) content, high modal orthopyroxene abundance (> 35%) and high ϵ Nd ( t ) (+18.4 to +21.4), which were generated by the reaction between peridotite and eclogite-derived melts. The clinopyroxenes from the Songling peridotites were in equilibrium with a Nb-, Zr- and Ti-depleted arc-like magma. The Majiayu peridotites are characterized by depletion of Nb, Zr and Hf and are highly enriched in FeOt, Th and light rare earth elements (LREEs), which can be interpreted as an open system reaction between hydrous melts and fore-arc mantle peridotites. These two peridotite blocks are considered to be arc-related mantle peridotites that experienced melt extraction and metasomatism in different styles. They were exhumed to the north margin of the North China Craton during the c. 2.47 Ga arc–continent collision along the Zunhua structural belt.