Trace element and Nd–Sr isotope constraints on origin of the Chifeng flood basalts, North China

Han, Bo; Wang, Shiguang; Kagami, Hiroo

doi:10.1016/s0009-2541(98)00172-7

Cited by 43 publications

(35 citation statements)

References 35 publications

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“…The mafic melts with the low e Nd(t) (\0) are inferred to be derived from enriched lithospheric mantle, while the melts with the high e Nd(t) ([0) are from the asthenospheric mantle (e.g., Xu 2001). The e Nd(t) values of Cenozoic basalts in Chifeng area range from ?1.6 to ?4.4 (Han et al 1999), similar to those of Cenozoic basalts in eastern NCC (e.g., Xu 2001;Zhang et al 2009;Zeng et al 2010Zeng et al , 2011Xu et al 2012), thus favoring an asthenospheric origin. More importantly, geophysical investigations have showed that the present lithosphere thickness beneath Chifeng area is *100 km (Ma 1987;Chen 2010), in agreement with the inferred melting depth of Xindian basalts (*3.0 GPa; Fig.…”

Section: Discussionsupporting

confidence: 52%

“…Accompanying the destruction of NCC and the asthenosphere upwelling, a large area of basalts has been erupted in this area since Late Cretaceous, especially during Cenozoic periods (Fig. 1b;Luo and Chen 1990;Liu et al 1992c;Han et al 1999;Jia et al 2002;Zheng et al 2002;Zhang et al 2003;Zhao et al 2004;Shi et al 2005). According to Jia et al (2002), basalts in Chifeng area could be divided into four epochs: Oligocene (mainly [20 Ma), Late Miocene (6-10 Ma), Pliocene (*5 Ma) and Pleistocene (\1 Ma).…”

Section: Geological Background and Petrographymentioning

confidence: 99%

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Constraints from melt inclusions and their host olivines on the petrogenesis of Oligocene-Early Miocene Xindian basalts, Chifeng area, North China Craton

Zhang

Qian

et al. 2012

Contrib Mineral Petrol

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The geochemical characteristics of melt inclusions and their host olivines provide important information on the processes that create magmas and the nature of their mantle and crustal source regions. We report chemical compositions of melt inclusions, their host olivines and bulk rocks of Xindian basalts in Chifeng area, North China Craton. Compositions of both bulk rocks and melt inclusions are tholeiitic. Based on petrographic observations and compositional variation of melt inclusions, the crystallizing sequence of Xindian basalts is as follows: olivine (at MgO [ *5.5 wt%), plagioclase (beginning at MgO = *5.5 wt%), clinopyroxene and ilmenite (at MgO \ 5.0 wt%). High Ni contents and Fe/Mn ratios, and low Ca and Mn contents in olivine phenocrysts, combining with low CaO contents of relatively high MgO melt inclusions (MgO [ 6 wt%), indicate that Xindian basalts are possibly derived from a pyroxenite source rather than a peridotite source. In the CS-MS-A diagram, all the high MgO melt inclusions (MgO [ 6.0 wt%) project in the field between garnet ? clinopyroxene ? liquid and garnet ? clinopyroxene ? orthopyroxene ? liquid near 3.0 GPa, further suggesting that residual minerals are mainly garnet and clinopyroxene, with possible presence of orthopyroxene, but without olivine. Modeling calculations using MELTS show that the water content of Xindian basalts is 0.3-0.7 wt% at MgO = 8.13 wt%. Using 20-25 % of partial melting estimated by moderately incompatible element ratios, the water content in the source of Xindian basalts is inferred to be C450 ppm, much higher than 6-85 ppm in dry lithospheric mantle. The melting depth is inferred to be *3.0 GPa, much deeper than that of tholeiitic lavas (\2.0 GPa), assuming a peridotite source with a normal mantle potential temperature. Such melting depth is virtually equal to the thickness of lithosphere beneath Chifeng area (*100 km), suggesting that Xindian basalts are derived from the asthenospheric mantle, if the lithospheric lid effect model is assumed.

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Section: Discussionsupporting

confidence: 52%

Section: Geological Background and Petrographymentioning

confidence: 99%

Constraints from melt inclusions and their host olivines on the petrogenesis of Oligocene-Early Miocene Xindian basalts, Chifeng area, North China Craton

Zhang

Qian

et al. 2012

Contrib Mineral Petrol

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“…8). Similar geochemical features can also be observed in late Cenozoic basalts from Chifeng and Fanshi (Han et al, 1999;Tang et al, 2006), where high-Ti basaltic magmas appear in the Archean North China Craton. In general, high-Ti basalts are abundant and widespread in the main CFB provinces, e.g., Parana, Siberia, Deccan, Karoo, and Ethiopian.…”

Section: Geochemical Characteristics Of the Abaga Basalts And Implicasupporting

confidence: 71%

Elemental and Sr-Nd-Pb isotopic compositions of late Cenozoic Abaga basalts, Inner Mongolia: Implications for petrogenesis and mantle process

Liu

Chen

et al. 2008

Geochem. J.

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“…This volcanic province could be genetically related to other Cenozoic volcanic provinces nearby such as Hannuoba , Chifeng (Han et al, 1999), and Abaga (Ho et al, 2008). The Jining Cenozoic basaltic volcanism spanned a long period from the late Oligocene to the Quaternary (~33~0.1 Ma) as evidenced by K-Ar dating, stratigraphy and paleontology (Luo and Chen, 1990;Chen et al, 2004;Zhang and Han, 2006;Ho et al, 2011;Zhao et al, 2013).…”

Section: Accepted M Manuscriptmentioning

confidence: 94%

Lithosphere thinning beneath west North China Craton: Evidence from geochemical and Sr–Nd–Hf isotope compositions of Jining basalts

Guo

Niu

et al. 2014

Lithos

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This study shows lithosphere evolution history in the west North China Craton (NCC) from the early Cretaceous to Quaternary by studying the major element, trace element and Sr-Nd-Hf isotope compositions in Jining basalts of 119.6108.6 Ma, 23.521.9 Ma and 1.30.11 Ma.The early Cretaceous basalts (119.6108.6 Ma) display enriched characteristics with high contents of incompatible elements, high 87 Sr/ 86 Sr i , low ε Nd (t) and low ε Hf (t). These basalts resulted from partial melting of ancient metasomatized lithospheric mantle, and we consider the 119.6108.6 Ma magmatism as indicating lithosphere thinning in the west NCC. Although the Pacific slab seen seismically in the mantle transition zone beneath eastern China is no older than 60 Ma, there exists convincing evidence for the presence of the Paleo-Pacific slab in the transition-zone in the Mesozoic. Thus we propose that the water released from the transition-zone slab hydrated A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTthe overlying lithosphere and further converted the base of the lithosphere into asthenosphere. This is the most likely mechanism responsible for the lithosphere thinning in the west NCC and the petrogenesis of the Jining 119.6108.6 Ma basalts. Sr i , high ε Nd (t) and high ε Hf (t). Upwelling and decompression melting of the eastward flowing asthenosphere from beneath western plateaus to beneath eastern hilly plains in the Cenozoic is the most plausible mechanism for the petrogenesis of Jining Cenozoic basalts (both of 23.521.9 Ma and 1.30.11 Ma), but the Jining 1.30.11 Ma basalts must have been produced beneath even thinner lithosphere.Taken together geophysical studies and our petrological and geochemical studies of all these three episodes of the Jining basalts, wepropose that the lithosphere in the west NCC has been thinning since the early Cretaceous and the thinning continues to the present.

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Trace element and Nd–Sr isotope constraints on origin of the Chifeng flood basalts, North China

Cited by 43 publications

References 35 publications

Constraints from melt inclusions and their host olivines on the petrogenesis of Oligocene-Early Miocene Xindian basalts, Chifeng area, North China Craton

Constraints from melt inclusions and their host olivines on the petrogenesis of Oligocene-Early Miocene Xindian basalts, Chifeng area, North China Craton

Elemental and Sr-Nd-Pb isotopic compositions of late Cenozoic Abaga basalts, Inner Mongolia: Implications for petrogenesis and mantle process

Lithosphere thinning beneath west North China Craton: Evidence from geochemical and Sr–Nd–Hf isotope compositions of Jining basalts

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