“…16) has been utilized to estimate the pressure or melting degree of partial melting. The trend for the fine-grained gabbro samples from the Shangzhuang intrusion suggests relatively high pressure or a low degree of partial melting when compared to the Abitibi (Kerrich, Polat & Xie, 2008) and Chagangnuoer (Li et al 2014 a ) high-Fe-rich basalts, the Zhongtiao Fe-rich mafic sill (Li et al 2014 a ), the Ji'nan gabbro (Xie et al 2015) and picrites from Iceland (Skovgaard et al 2001). Their features are similar to that of Fe-rich basalts from Tarim (Jiang et al 2004) and Emeishan (Xu et al 2003), although lower than the ranges in Siberian basalts (Arndt, Lehnert & Vasil'ev, 1995).…”
Section: Discussionmentioning
confidence: 99%
“…Figure 16.Plots of Zr/Y v. TiO 2 /Al 2 O 3 for the Shangzhuang rocks after Ichiyama & Ishiwatari (2005). Picrites from Iceland in the middle (Skovgaard et al 2001), an Fe-rich mafic sill from the Zhongtiao Mountains (Li et al 2014 a ), and Fe-rich basalts from Ji'nan gabbro (Xie et al 2015), Abitibi (Kerrich, Polat & Xie, 2008), Chagangnuoer (Li et al 2014 a ), Tarim (Jiang et al 2004), Emeishan (Xu et al 2003) and Siberia (Arndt, Lehnert & Vasil'ev, 1995) are shown for comparison.Figure 17.Plots of (a) Dy/Yb v. La/Yb (after Liu et al 2014) and (b) La v. La/Sm for the Shangzhuang rocks (after Zhu et al 2009). In (a), La, Dy and Yb concentrations of primitive mantle, sub-continental lithospheric mantle and lower crust are from Sun & McDonough (1989), McDonough (1990) and Rudnick & Gao (2003), respectively.…”
Section: Discussionmentioning
confidence: 99%
“…Plots of Zr/Y v. TiO 2 /Al 2 O 3 for the Shangzhuang rocks after Ichiyama & Ishiwatari (2005). Picrites from Iceland in the middle (Skovgaard et al 2001), an Fe-rich mafic sill from the Zhongtiao Mountains (Li et al 2014 a ), and Fe-rich basalts from Ji'nan gabbro (Xie et al 2015), Abitibi (Kerrich, Polat & Xie, 2008), Chagangnuoer (Li et al 2014 a ), Tarim (Jiang et al 2004), Emeishan (Xu et al 2003) and Siberia (Arndt, Lehnert & Vasil'ev, 1995) are shown for comparison.…”
The North China Craton (NCC) is one of the classic examples of decratonization through extensive lithospheric destruction during Mesozoic time. Among the various pulses of magmatism associated with cratonic erosion are the rare mafic intrusions in the Yanshan Belt. Here we investigate the Shangzhuang layered intrusion belonging to this suite, which is characterized by compositional layering with troctolite, noritic gabbro and gabbro/gabbroic anorthosite/gabbrodiorite from the bottom to top. The different lithologies of this intrusion exhibit close field relationships, similar chemical patterns and overall identical Lu–Hf isotopes indicating a co-magmatic nature. The fine-grained gabbros occurring near the margin of the intrusion display U–Pb ages similar to those of the other rocks and are considered to represent the composition of the parent magma, characterized by Fe, Mg and Ti enrichment. The magma was sourced from low-degree partial melting of spinel lherzolite sub-continental lithospheric mantle, which had been enriched by crust–mantle interaction and metasomatic fluids derived from the Mongolian oceanic slab subduction beneath the NCC during Late Palaeozoic time. In addition, limited asthenospheric or deeper-mantle materials were also locally mixed with the enriched mantle as the final source component. Our zircon U–Pb data constrain the emplacement age of this intrusion as c. 128–123 Ma in Early Cretaceous time, and correlates with the regional extensional tectonics between c. 135 and 115 Ma in the eastern and central NCC. Mantle upwelling associated with this event resulted in the thermal and chemical erosion of the lithospheric mantle, and emplacement of the parent magma of this layered intrusion.
“…16) has been utilized to estimate the pressure or melting degree of partial melting. The trend for the fine-grained gabbro samples from the Shangzhuang intrusion suggests relatively high pressure or a low degree of partial melting when compared to the Abitibi (Kerrich, Polat & Xie, 2008) and Chagangnuoer (Li et al 2014 a ) high-Fe-rich basalts, the Zhongtiao Fe-rich mafic sill (Li et al 2014 a ), the Ji'nan gabbro (Xie et al 2015) and picrites from Iceland (Skovgaard et al 2001). Their features are similar to that of Fe-rich basalts from Tarim (Jiang et al 2004) and Emeishan (Xu et al 2003), although lower than the ranges in Siberian basalts (Arndt, Lehnert & Vasil'ev, 1995).…”
Section: Discussionmentioning
confidence: 99%
“…Figure 16.Plots of Zr/Y v. TiO 2 /Al 2 O 3 for the Shangzhuang rocks after Ichiyama & Ishiwatari (2005). Picrites from Iceland in the middle (Skovgaard et al 2001), an Fe-rich mafic sill from the Zhongtiao Mountains (Li et al 2014 a ), and Fe-rich basalts from Ji'nan gabbro (Xie et al 2015), Abitibi (Kerrich, Polat & Xie, 2008), Chagangnuoer (Li et al 2014 a ), Tarim (Jiang et al 2004), Emeishan (Xu et al 2003) and Siberia (Arndt, Lehnert & Vasil'ev, 1995) are shown for comparison.Figure 17.Plots of (a) Dy/Yb v. La/Yb (after Liu et al 2014) and (b) La v. La/Sm for the Shangzhuang rocks (after Zhu et al 2009). In (a), La, Dy and Yb concentrations of primitive mantle, sub-continental lithospheric mantle and lower crust are from Sun & McDonough (1989), McDonough (1990) and Rudnick & Gao (2003), respectively.…”
Section: Discussionmentioning
confidence: 99%
“…Plots of Zr/Y v. TiO 2 /Al 2 O 3 for the Shangzhuang rocks after Ichiyama & Ishiwatari (2005). Picrites from Iceland in the middle (Skovgaard et al 2001), an Fe-rich mafic sill from the Zhongtiao Mountains (Li et al 2014 a ), and Fe-rich basalts from Ji'nan gabbro (Xie et al 2015), Abitibi (Kerrich, Polat & Xie, 2008), Chagangnuoer (Li et al 2014 a ), Tarim (Jiang et al 2004), Emeishan (Xu et al 2003) and Siberia (Arndt, Lehnert & Vasil'ev, 1995) are shown for comparison.…”
The North China Craton (NCC) is one of the classic examples of decratonization through extensive lithospheric destruction during Mesozoic time. Among the various pulses of magmatism associated with cratonic erosion are the rare mafic intrusions in the Yanshan Belt. Here we investigate the Shangzhuang layered intrusion belonging to this suite, which is characterized by compositional layering with troctolite, noritic gabbro and gabbro/gabbroic anorthosite/gabbrodiorite from the bottom to top. The different lithologies of this intrusion exhibit close field relationships, similar chemical patterns and overall identical Lu–Hf isotopes indicating a co-magmatic nature. The fine-grained gabbros occurring near the margin of the intrusion display U–Pb ages similar to those of the other rocks and are considered to represent the composition of the parent magma, characterized by Fe, Mg and Ti enrichment. The magma was sourced from low-degree partial melting of spinel lherzolite sub-continental lithospheric mantle, which had been enriched by crust–mantle interaction and metasomatic fluids derived from the Mongolian oceanic slab subduction beneath the NCC during Late Palaeozoic time. In addition, limited asthenospheric or deeper-mantle materials were also locally mixed with the enriched mantle as the final source component. Our zircon U–Pb data constrain the emplacement age of this intrusion as c. 128–123 Ma in Early Cretaceous time, and correlates with the regional extensional tectonics between c. 135 and 115 Ma in the eastern and central NCC. Mantle upwelling associated with this event resulted in the thermal and chemical erosion of the lithospheric mantle, and emplacement of the parent magma of this layered intrusion.
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