Contrasting geochemistry of the Cretaceous volcanic suites in Shandong province and its implications for the Mesozoic lower crust delamination in the eastern North China craton

Two tales of the continental lithospheric mantle prior to the destruction of the North China Craton: Insights from Early Cretaceous mafic intrusions in western Shandong, East China

“…10b), coincident with the large-scale mafic magmatism in western Shandong (132-125 Ma) (e.g., Xu et al, 2004a,b;Yang et al, 2005;Ling et al, 2009). This suggests that the crustal delamination at the weakened lithospheric zones might have had a strong influence on lithospheric thinning beneath the interior of the craton (Fig.…”

“…1d) that was formed at 128-130 Ma in the Luxi area (BGMRSP, 1991;Ling et al, 2009). The Zouping gabbro complex is mainly composed of olivine gabbro and olivine-free twopyroxene gabbros.…”

“…8). Therefore, (Table 4); Small symbols are data from the literature: the Jinan gabbro (Guo et al, 2001;Zhang et al, 2004;Yang, 2007), the Zouping gabbro (Guo et al, 2001;Li et al, 2007), the Tongshi monzonite-monzodiorite and syenite (Xu et al, 2004a;Lan et al, 2012), the Laiwu diorite (Xu et al, 2004a) and andesite (Ying et al, 2006), the Mengyin volcanic rocks (Ying et al, 2006;Liu et al, 2008;Ling et al, 2009), the Yinan gabbro-diorite (Xu et al, 2004a,b), the Fangcheng basalt and mantle xenoliths , the Ordovician kimberlite-borne mantle xenoliths from Mengyin and Feixian , the metamorphic and igneous rocks in the Dabie orogenic belt (Jahn et al, 1999;Zhang and Gao, 2002;Fan et al, 2004;Wang et al, 2005), the granulite xenoliths within the Late Cretaceous mafic dyke at Junan (Ying et al, 2010) and the Cenozoic alkali basalts at Hannuoba and Nushan (Huang et al, 2004). The field for the Jianguo Mesozoic basalts is after Zhang et al (2003).…”

“…11). Furthermore, the earliest lowMg ($157 Ma; Zhang et al, 2010) and high-Mg ($136 Ma; Wang et al, 2006) adakitic magmatism took place prior to the large-scale magmatism in western Shandong (132-125 Ma) (e.g., Xu et al, 2004a,b;Ling et al, 2009). Such a magmatic sequence can be interpreted as the following dynamic sequence: crustal thickeninginduced adakitic magmatism !…”

High Oxygen Fugacity and Slab Melting Linked to Cu Mineralization: Evidence from Dexing Porphyry Copper Deposits, Southeastern China

“…7). This has been attributed to differing origins: Dabie adakitic rocks formed through partial melting of the lower continental crust (Huang et al 2008;Ling et al 2009b;Liu et al 2010), whereas LYRB adakites formed through slab melting (Ling et al 2009aSun et al 2010). This suggests that Dexing porphyries have major components from slab melting.…”