In situ perovskite Sr–Nd isotopic constraints on the petrogenesis of the Ordovician Mengyin kimberlites in the North China Craton

Destruction of North China Craton: Insights from temporal and spatial evolution of the proto-basins and magmatism

“…The earliest magmatism (~470 Ma) after the cratonization is the kimberlite along the Tan-Lu Fault, indicating a thick (~200 km) lithosphere during the early Paleozoic [1,31]. Extensive magmatism occurred on the northern margin of the North China Craton during the late Paleozoic ( Figure 2(a)), attributed to the subduction of the Paleo-Asian Ocean Plate [17,32].…”

“…Enriched components commonly resided at depths of ~100 km in the continental lithosphere [60]. If the initial thickness of the North China Craton lithosphere was ~200 km [1,31], despite their relatively lower melting temperature, these enriched components would not melt because of the limited heat transfer from the asthenosphere due to the long distance of ~100 km apart from underlying asthenosphere. This allows the formation of lithospheric mantle derived magma only when the lithosphere is thinned enough, and the enhanced heat transfer from the asthenosphere to the lithosphere allows the cross between the geotherm and solidus of enriched mantle.…”

High-Mg adakitic rocks and their complementary cumulates formed by crystal fractionation of hydrous mafic magmas in a continental crustal magma chamber

“…8). There are no systematic differences in isotopes between lithologies; the isotopic values are comparable with those of early Mesozoic subcontinental lithospheric mantle (SCLM) beneath the NCC (Yang et al, 2009;Zhang et al, 2008;Zheng and Lu, 1999).…”

Formation of mafic magmas through lower crustal AFC processes — An example from the Jinan gabbroic intrusion in the North China Block

“…Guo et al, 2013;Zhang et al, 2002); Cenozoic basalts (Chen et al, 2009). The terrestrial array is referred to Vervoort et al (2011). O isotopic compositions to those of perovskite crystallized in the early Paleozoic Mengyin kimberlites (Yang et al, 2009) and have Zr, Nb, Nd and Hf concentrations similar to primitive mantle estimated by Sun and McDonough (1989). The metasomatic carbonatite is assumed to have similar Nd and Hf isotopic compositions and trace element concentrations to those of Mesozoic Zibo igneous carbonatites (Ying et al, 2004 and this study).…”

“…Whole-rock Sr-Nd-Hf isotopic diagrams of the Jinan gabbros. Data sources: the Sulu mafic rocks (Guo et al, 2004); the carbonatites (Ying et al, 2004 and our unpublished data); the Mesozoic Taihangshan mafic rocks Wang et al, 2006); the Jinan gabbros (Guo et al, 2001;Huang et al, 2012;Yang et al, 2012a); NCB LCC (Huang et al, 2004;Liu et al, 2004;Zhou et al, 2002); NCB UCC (Cai et al, 2011); Perovskite in Mengyin kimberlites (Yang et al, 2009); Fangcheng basalts (J.T. Guo et al, 2013;Zhang et al, 2002); Cenozoic basalts (Chen et al, 2009).…”