U–Pb and Hf-isotope analysis of zircons in mafic xenoliths from Fuxian kimberlites: evolution of the lower crust beneath the North China craton

Late Archean to Early Proterozoic lithospheric mantle beneath the western North China craton: Sr–Nd–Os isotopes of peridotite xenoliths from Yangyuan and Fansi

“…Nevertheless, the "exotic" Proterozoic mantle as implied by the third alternative is not consistent with the accumulating evidence for an intense and widespread Paleoproterozoic mantle melting event in the eastern NCC. For instance, the granulite xenoliths in the Fuxian kimberlites were formed at 2.5 Ga and represent underplates (ε Hf (t) = 2.4-8.4) of a significant magmatic event (Zheng et al, 2004). Similar 2.5 Ga zircons with positive Hf composition are preserved in the Mesozoic intrusions in Shandong province , suggesting that the Proterozoic mantle is indeed an intrinsic component of the lithospheric mantle under the eastern NCC.…”

Geochronology and geochemistry of late Archean adakitic plutons from the Taishan granite–greenstone Terrain: Implications for tectonic evolution of the eastern North China Craton

“…These zircon U-Pb dates, coupled with other high-quality dating reported recently from this area (Shen et al, 1997(Shen et al, , 2004(Shen et al, , 2007Zheng et al, 2004Zheng et al, , 2009Wu et al, 2006;Wang et al, 2009), indicate that three episodes of magmatism occurred during the Late Archean time, at ∼2.8-2.7, 2.7-2.6, and 2.6-2.5 Ga. The most voluminous and widespread magmatism occurred at ∼2.7-2.6 Ga (Wang et al, 2009;Wan et al, 2011), corresponding to a widespread crustal generation event in the North China Craton (Jahn et al, 1988;Jahn and Ernst, 1990;Shen et al, 1997;Wu et al, 1998Wu et al, , 2005aWu et al, ,b, 2006Li and Kusky, 2007).…”

“…This refractory mantle was eventually underplated beneath the oceanic plate, forming an overthickened lithospheric keel that migrated with the subducting oceanic plate. (2) Around ∼2.7-2.6 Ga, the plume-derived heat gradually spread and reached the downgoing tholeiitic oceanic slab, triggering largescale partial melting of the oceanic plate and producing voluminous TTG magmas (e.g., Wyman et al, 2002;Rey et al, 2003), forming the widespread ∼2.7-2.6 Ga TTG gneisses observed in the study area (e.g., Jahn et al, 1988;Cao et al, 1996;Zheng et al, 2004Zheng et al, , 2009Yang et al, 2008). (3) Between 2.60 and 2.54 Ga, the interaction of the oceanic plateau with the overthickened lithospheric keel led to collision between the ocean plateau and the island arc; subduction was jammed by the thick plateau crust, which became imbricated, leading to subduction stepping back across the thickened plume-arc composite lithosphere (e.g., Wyman et al, 2002).…”

Coexisting Early Cretaceous High-Mg Andesites and Adakitic Rocks in the North China Craton: the Role of Water in Intraplate Magmatism and Cratonic Destruction

“…14c and f), this component would have low e Nd (t) and Th/La, which is inconsistent with those of the Guiyunhua HMAs. Furthermore, lower continental crust beneath eastern China is refractory and nearly anhydrous Zhai et al, 2001;Zheng et al, 2004;Jiang et al, 2013), and therefore, if recycled, this lower crust could not supply enough water to induce hydrous melting of the lithospheric mantle. The involvement of subducted sediments can reasonably explain the isotopic and incompatible trace element characteristics of the high-Mg lavas.…”

“…The rarity of hydrous phases in lower crustal rocks from the NCC suggests that the lower crust is essentially refractory and anhydrous Zhai et al, 2001;Zheng et al, 2004;Jiang et al, 2013). Furthermore, zircon-saturation temperatures suggest that the initial magma temperatures of late Mesozoic Itype granitoids in the Liaodong Peninsula were 750-800 C (Wu et al, 2007), which is much lower than that of amphibole-dehydration melting reactions (Weinberg & Hasalov a, 2015).…”