Subduction-modified subcontinental mantle in South China: Trace element and isotope evidence in basalts from Hainan Island

Zhang, Ming; Tu, Kan; Xie, Ganquan; Flower, Martin F. J.

doi:10.1007/bf03166792

Cited by 12 publications

(5 citation statements)

References 40 publications

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“…White and Dupre [87], and Mukasa et al [88] suggested that the Dupal anomaly is related to the involvement of crustal components by subduction, on the basis of Pb isotopic composition. This has been adopted by Zhu and Wang [54], and by Zhang et al [66,89], to account for the Pb isotopic systematics of basalts from the Lei-Qiong area. It is likely that subduction-related components in the mantle source are related to recycled crustal components recovered by mantle plumes.…”

Section: Hainan Mantle Plume and Its Link With The Opening Of The Soumentioning

confidence: 99%

Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design

et al. 2011

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The South China Sea (SCS) is characterized by abundant seamounts, which provide important information about the evolution of the SCS and related deep processes. Cenozoic volcanism in the SCS and its surroundings comprises three stages relative to the spreading of the SCS: pre-spreading (>32 Ma), syn-spreading (32-16 Ma), and post-spreading (<16 Ma). The pre-spreading magmatism predominantly occurs on the northern margin of the SCS and in South China coastal areas and shows a bi-modal affinity. The syn-spreading magmatic activity was very limited on the periphery of the SCS, but may be concentrated in the SCS. However, seafloor samples of this stage are not available yet because of overlying thick sedimentary deposits. Post-spreading magmatism is widespread in the central and southwest sub-basins of the SCS, Hainan Island, Leizhou Peninsula, Thailand, and Vietnam. These are mainly alkali basalts with subordinate tholeiites, and display OIB-type geochemical characteristics. The Dupal isotope anomaly and presence of high-magnesian olivine phenocrysts suggests their possible derivation from the Hainan mantle plume. The temporal and spatial distribution of Cenozoic volcanism in the SCS and its surroundings may be accounted for either by plate stress re-organization before and after SCS spreading, or by ridge suction of plume flow during opening of the SCS. If the latter is the case, the volcanic rocks within the SCS basin may not be typical mid-ocean ridge basalts (MORB). It remains puzzling, however, that the transition between the South China continental margin and the SCS basin does not have features typical of a volcanic rifted margin. Clearly, the relationship between mantle plume and SCS opening needs further evaluation. A better understanding of the link between deep processes and opening of the SCS not only requires enhanced studies on igneous petrogenesis, but also is heavily dependent on systematic sampling of seafloor rocks.

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Section: Hainan Mantle Plume and Its Link With The Opening Of The Soumentioning

confidence: 99%

Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design

et al. 2011

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“…Chung et al (1994) suggested that the EM2 component of continental lithospheric mantle is related to the subduction of the Pacific plate beneath the Eurasian plate in Mesozoic. Zhang et al (1996) also concluded that the mantle source of Leiqiong basalts might have been affected by sediments associated with a paleosubduction zone. The negative Nb anomaly observed in the spidergram of some basalts (Fig.…”

Section: Mantle Metasomatism Beneath Se Chinamentioning

confidence: 99%

40Ar–39Ar dating and geochemical characteristics of late Cenozoic basaltic rocks from the Zhejiang–Fujian region, SE China: eruption ages, magma evolution and petrogenesis

et al. 2003

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“…The strong OIB character of the Cenozoic basalts in southeastern China suggests that the Mesozoic arc-like lithosphere in this region may have been consumed or completely modified. The EMII signatures of these basalts may have been derived from continental lithospheric mantle affected by Mesozoic subduction (Tu & Flower, 1991;Flower et al 1992;Chung et al 1994;Zhang et al 1996).…”

Section: D Secular Evolution Of the Lithospheric Mantle Beneath Sementioning

confidence: 99%

Elemental and Sr–Nd–Pb isotopic geochemistry of Mesozoic mafic intrusions in southern Fujian Province, SE China: implications for lithospheric mantle evolution

Zhao

Zhou

et al. 2007

Geol. Mag.

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Cretaceous mafic dykes in Fujian province, SE China provide an opportunity to examine the nature of their mantle source and the secular evolution of the Mesozoic lithospheric mantle beneath SE China. The mafic rocks have SiO2 ranging from 47.42 to 55.40 wt %, Al2O3 from 14.0 wt % to 20.4 wt %, CaO from 4.09 to 11.7 wt % and total alkaline (K2O+Na2O) from 2.15 wt % to 6.59 wt %. Two types are recognized based on their REE and primitive mantle-normalized trace element patterns. Type-A is the dominant Mesozoic mafic rock type in SE China and is characterized by enrichment of light rare earth elements (LREE) ((La/Yb)n = 2.85–19.0) and arc-like trace element geochemistry. Type-P has relatively flat REE patterns ((La/Yb)n = 1.68–3.43) and primitive mantle-like trace element patterns except for enrichment of Rb, Ba and Pb. Type-A samples show EMII signatures on the Sr-Nd isotopic diagram, whereas type-P rocks have high initial 143Nd/144Nd ratios (0.5126–0.5128) relative to the type-A rocks (143Nd/144Nd = 0.5124–0.5127). The type-A rocks have 207Pb/204Pb ranging from 15.47 to 15.67 and 206Pb/204Pb from 18.26 to 18.52. All the type-A rocks show a negative correlation between 143Nd/144Nd and 206Pb/204Pb ratios and a positive relationship between 87Sr/86Sr and 206Pb/204Pb ratios, indicating mixing of a depleted mantle source and an EMII component. Geochemical modelling shows that the parental magmas were formed by 5–15 % partial melting of a spinel lherzolite, and contaminated by less than 1 % melt derived from subducted sediment. The type-P magmas were derived from a mantle source unmodified by subduction components. The wide distribution of type-A dykes in SE China suggests that subduction-modified lithospheric mantle was extensive beneath the Cathaysia Block. Geochemical differences between Mesozoic and Cenozoic mafic rocks indicate that lithospheric thinning beneath SE China occurred in two episodes: firstly by heterogeneous modification by subducted components in early Mesozoic times, and later by chemical–mechanical erosion related to convective upwelling of the asthenosphere during Cenozoic times.

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Subduction-modified subcontinental mantle in South China: Trace element and isotope evidence in basalts from Hainan Island

Cited by 12 publications

References 40 publications

Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design

Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design

40Ar–39Ar dating and geochemical characteristics of late Cenozoic basaltic rocks from the Zhejiang–Fujian region, SE China: eruption ages, magma evolution and petrogenesis

Elemental and Sr–Nd–Pb isotopic geochemistry of Mesozoic mafic intrusions in southern Fujian Province, SE China: implications for lithospheric mantle evolution

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