Geochemistry of Cenozoic basalts from the Bohai Bay Basin: Implications for a heterogeneous mantle source and lithospheric evolution beneath the eastern North China Craton

Li, Hongyan; Huang, Xiaolong; Guo, Hua

doi:10.1016/j.lithos.2014.02.026

Cited by 41 publications

(43 citation statements)

References 91 publications

(126 reference statements)

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Section: Geological Setting and Samplingmentioning

confidence: 99%

“…The earliest basalts, with 40 Ar/ 39 Ar ages of 46.9-45.5 Ma, are borehole samples of alkali basalt from the BBB (Li et al, 2014). The second eruptive period, 23.0-10.3 Ma is based both on borehole samples from the BBB (Li et al, 2014) and outcrops along the TLFZ (He et al, 2011;Xu et al, 2012b), comprising mostly alkali basalt and basanite. The last magmatic episode, 8.7-0.3 Ma, consists of scattered and isolated basaltic centers erupting mainly basanite and nephelinite, occurring as outcrops far from the TLFZ, such as Penglai and Qixia in the Jiaodong Peninsula and Wudi in the overlap region between the western Shandong and BBB (e.g., Zeng et al, 2010).…”

Section: Geological Setting and Samplingmentioning

confidence: 99%

“…High field-strength elements, Sr and the rare earths were separated by ion chromatography using AG50-X8 cation exchange resin. Separations of Nd and Hf were carried out on a HDEHP-coated Kef column (Li et al, 2014 (Weis et al, 2005).…”

Section: Bulk Rock Analysismentioning

confidence: 99%

“…5a). A notable characteristic of the Cenozoic basalts in the western Shandong and BBB is that their Hf and Nd isotopes fall along a mixing trend between the high-and low-Si sample endmembers Zeng et al, 2011;Li et al, 2014), with the high-Si samples falling within the Indian Ocean mantle domain, and the low-Si samples falling within the Pacific Ocean domain, as per Pearce et al (1999) (Fig. 5b and c).…”

Section: Bulk Rock Chemical Compositionmentioning

confidence: 99%

“…1). The sources of northeastern China basalts have been described as mixing between an isotopically depleted mantle and EM1 mantle (e.g., Liu et al, 2008;Chen et al, 2009;Zeng et al, 2010;Kuang et al, 2012;Xu et al, 2012a,b;Hong et al, 2013;Li et al, 2014), while those of southeastern China basalts have been characterized as mixing between a depleted mantle and EM2 mantle (e.g., Zou et al, 2000;Huang et al, 2013). Therefore, it is unreasonable to simply attribute the enriched components of eastern China basalts to the stagnant Pacific slab in the MTZ.…”

Section: Introductionmentioning

confidence: 99%

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Olivine and melt inclusion chemical constraints on the source of intracontinental basalts from the eastern North China Craton: Discrimination of contributions from the subducted Pacific slab

Ryan

et al. 2016

Geochimica et Cosmochimica Acta

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Section: Geological Setting and Samplingmentioning

confidence: 99%

Section: Geological Setting and Samplingmentioning

confidence: 99%

Section: Bulk Rock Analysismentioning

confidence: 99%

Section: Bulk Rock Chemical Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Olivine and melt inclusion chemical constraints on the source of intracontinental basalts from the eastern North China Craton: Discrimination of contributions from the subducted Pacific slab

Ryan

et al. 2016

Geochimica et Cosmochimica Acta

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Recycled oceanic crust and marine sediment in the source of alkali basalts in Shandong, eastern China: Evidence from magma water content and oxygen isotopes

et al. 2015

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The magma water contents and cpx δ18O values in alkali basalts from the Fuyanyshan (FYS) volcano in Shandong, eastern China, were investigated by an inverse calculation based on the water content of clinopyroxene (cpx) phenocrysts, the ivAlcpx‐dependent water partitioning coefficient Dwaternormalcnormalpnormalxtrue/melt, and secondary ion mass spectrometer, respectively. The calculated water content (H2O wt.) of magma ranges from 0.58% to 3.89%. It positively correlates with heavy rare earth element concentrations and bulk rock 87Sr/86Sr ratios, and it negatively correlates with Nb/U ratios. However, it is not correlated with bulk Mg# (Mg# = 100 × Mg / (Mg + Fe)) and (La/Yb)n (n represents primitive mantle normalization). Combined with the rather homogenous distribution of water content within cpx grains, these correlations indicate that the water variations among different samples represent the original magma signature, rather than results of a shallow process, such as degassing and diffusion. The δ18O of cpx phenocrysts varies from 3.6‰ to 6.3‰ (±0.5‰, 2SD), which may be best explained by the involvement of components from the lower and upper oceanic crust with marine sediments within the mantle source. The H2O/Ce ratios of the calculated melts range from 113 to 696 and form a positive trend with bulk rock 87Sr/86Sr, which cannot be explained by the recycled Sulu eclogite or by the metasomatized lithospheric mantle. Our modeling calculation shows that the decoupling of εHf and εNd could be caused by the involvement of marine sediments. Combing the high Ba/Th ratios, positive Sr spikes, and low Ce/Pb ratios for the Fuyanshan basalts, we suggest that the hydrous nature of the FYS basalts was derived from the hydrous mantle transition zone with ancient sediments.

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Evolution of the mantle beneath the eastern North China Craton during the Cenozoic: Linking geochemical and geophysical observations

Ryan

et al. 2017

JGR Solid Earth

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Recent discoveries related to the geochemistry of Cenozoic basalts and the geophysics of the deep mantle beneath eastern Eurasia make it possible to place constraints on the relationship between the seismic tomography of subcontinental mantle domains and their geochemical heterogeneities. Basalts with ocean island basalt‐like trace elements erupted during (56–23 Ma) and after (≤23 Ma) rifting of the eastern North China Craton (NCC) show evidence for the mixing of an isotopically depleted source and an EMI (Enriched mantle type I) pyroxenitic mantle. NCC rifting‐stage basalts exhibit anomalously low MgO and Fe2O3T and high SiO2 and Al2O3, as well as low Dy/Yb and Y/Yb and high εHf at a given εNd, as compared to the postrifting basalts. Temporal compositional variations and their association with basin subsidence indicate that heterogeneity in the eastern NCC asthenospheric mantle is the primary driver for intraplate magmatism in this region. The specific magmatic sources shifted in terms of depth, related to lithospheric thinning and thickening in the eastern NCC. The NCC EMI mantle domain most likely developed due to ancient events, is persistent through time, and is not related to dehydration of the stagnant Pacific slab in the mantle transition zone. Based on the chemical signatures of postrifting basalts, contributions from the Pacific slab are likely to be carbonatite rich. Mantle metasomatism by carbonatite melts from the Pacific slab and the interaction of these melts at shallower depths with EMI pyroxenitic mantle domains to trigger melting are contributors to the observed low P wave velocity zone beneath eastern Eurasia.

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Geochemistry of Cenozoic basalts from the Bohai Bay Basin: Implications for a heterogeneous mantle source and lithospheric evolution beneath the eastern North China Craton

Cited by 41 publications

References 91 publications

Olivine and melt inclusion chemical constraints on the source of intracontinental basalts from the eastern North China Craton: Discrimination of contributions from the subducted Pacific slab

Olivine and melt inclusion chemical constraints on the source of intracontinental basalts from the eastern North China Craton: Discrimination of contributions from the subducted Pacific slab

Recycled oceanic crust and marine sediment in the source of alkali basalts in Shandong, eastern China: Evidence from magma water content and oxygen isotopes

Evolution of the mantle beneath the eastern North China Craton during the Cenozoic: Linking geochemical and geophysical observations

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