Mantle dynamics beneath East Asia constrained by Sr, Nd, Pb and Hf isotopic systematics of ultramafic xenoliths and their host basalts from Hannuoba, North China

Chemical and Pb isotope composition of olivine-hosted melt inclusions from the Hannuoba basalts, North China Craton: Implications for petrogenesis and mantle source

“…Many previous studies have suggested that the effect of crustal contamination on the composition of Cenozoic Hannuoba basalts appears to be insignificant Zhi et al, 1990;Basu et al, 1991;Choi et al, 2008). Additionally, the presence of mantlederived xenoliths in the Hannuoba alkali basalts implies that the host lavas would have ascended rapidly toward the surface and therefore were not significantly affected by crustal contamination.…”

“…N-MORB and OIB data are from Sun and McDonough (1989). Whole-rock trace-element compositions of Cenozoic basalts from the NCC are from previous studies Basu et al, 1991;Xu et al, 2005Xu et al, , 2012aTang et al, 2006;Choi et al, 2008;Ho et al, 2008;Liu et al, 2008;Chen et al, 2009;Zhang et al, 2009;Zeng et al, 2010Zeng et al, , 2011Wang et al, 2011;Hong et al, 2013;Xu et al, 2012b;Zhang et al, 2012;Sakuyama et al, 2013). that a residual mineral phase fractionating Ba from Th was present during partial melting (Fig.…”

“…These findings imply the presence of components in their mantle source that are considerably enriched in incompatible trace elements compared to the depleted mid-ocean ridge basalt (MORB)-type asthenospheric mantle. It is generally accepted that the geochemical characteristics of these basalts can be attributed to the mixing of a depleted mantle component and an EMI-like component Zhi et al, 1990;Basu et al, 1991;Xu et al, 2005;Tang et al, 2006;Choi et al, 2008). However, the origin and the nature of the depleted and enriched mantle components and the processes that enrich the mantle are still hotly debated.…”

“…Numerous petrological and geochemical studies that have been carried out over the past two decades Zhi et al, 1990;Basu et al, 1991;Xu et al, 2005Xu et al, , 2012aTang et al, 2006;Choi et al, 2008;Chen et al, 2009;Zhang et al, 2009;Wang et al, 2011;Zeng et al, 2011;Hong et al, 2013;Sakuyama et al, 2013) show that the Cenozoic basalts in the NCC have ocean island basalt (OIB)-type trace element compositions (e.g. enriched in large ion lithophile elements (LILE), displaying light rare-earth element (LREE) enrichment, (La/Sm) PM N 1, and positive Nb and Ta anomalies).…”

Lithospheric Mantle beneath the Korean Peninsula: Implications from Peridotite Xenoliths in Alkali Basalts

“…이런 관찰 사실은 페리도타이트 암석들이 맨틀에서의 부분용융후 잔류물이라는 주장 과 위배된다. 그러나 이는 세계 여러 곳의 페리도타 이트에서 관찰되는 일반적인 경향으로서, Frey and Green (1974)을 위시하여 대개의 연구자들은 이를 이 차적인 변성교대작용의 흔적으로 해석한다 (Frey and Prinz, 1978;Shi et al, 1998;Choi et al, , 2008. 즉, 연약권이나 암석권맨틀 하부에서 생성된 Fig.…”