Petrogenesis of Late Cenozoic basalts from North Hainan Island: Constraints from melt inclusions and their host olivines

Liu, Jianqiang; Ren, Zhong‐Yuan; Nichols, A. R.; Song, Mo; Qian, S. J.; Zhang, Yan; Zhao, Peipei

doi:10.1016/j.gca.2014.12.023

Cited by 62 publications

(47 citation statements)

References 127 publications

(267 reference statements)

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“…Short lines with end‐bars in (a) and (d) are ±1σ Ni and Fe/Mn variations of the primary magmas from which olivines crystallize. Data of olivine for global MORBs (Indian ridge, Mid‐Atlantic Ridge, and East Pacific Rise) and Hawaiian OIBs are from Sobolev et al (); data of olivines for Hainan OIBs are from Liu et al () and for Indochina OIBs are from Hoang et al (; note that data of olivines for Hainan and Indochina with Fo < 70 and Fe/Mn > 90 are not used in the plots).…”

Section: Resultsmentioning

confidence: 99%

Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea

Zhang

Sun

Seward

2018

Geochem Geophys Geosyst

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The genesis of seamount chains along fossil spreading ridges reflects the mantle melting dynamics of dying spreading center. The South China Sea developed a seamount chain along its fossil ridge shortly after cessation of spreading. International Ocean Discovery Program Expedition 349 has recovered three volcanic layers, a shallow volcanic breccia layer and two deeper (upper and lower sections) basalt layers, at Site U1431 near the fossil ridge of the South China Sea. Despite the mid‐ocean ridge basalt (MORB)‐like geochemistry of the lower and upper section basalts, they show distinct geochemical differences that indicate a change of mantle source and a transition from spreading to intraplate volcanism. While the lower section basalts could reflect the last stage volcanism before the cessation of ridge spreading, the upper section basalts with whole‐rock MgO up to ~20 wt.% were formed by intraplate volcanism with significant olivine accumulation once the spreading center had become inactive. The MORB type basalts at Site U1431 have Hawaii‐like high olivine Ni and Fe/Mn and low olivine Ca and Mn and bulk‐rock low CaO that are distinctly different from normal global MORBs, suggesting an anomalous mantle source in lithology. We suggest that an eclogite‐/pyroxenite‐rich component, possibly sourced from the Hainan hot spot, played a fundamental role in the transition from spreading to intraplate volcanism of the dying spreading ridge of the South China Sea.

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Section: Resultsmentioning

confidence: 99%

Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea

Zhang

Sun

Seward

2018

Geochem Geophys Geosyst

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“…These volcanic rocks are generally interpreted to represent melts generated in the asthenosphere because they have ocean island basalt‐type elemental signatures, for example, they show enrichment in Nb and Ta and depletion in K and Pb relative to light rare earth elements (LREEs; e.g., Liu, ; Zhou & Armstrong, ; Zou et al, ; Chen et al, ; Zeng et al, ). Low Ca and high Ni contents of their olivine phenocrysts (e.g., Hong et al, ; Li, Xu, et al, ; Liu, Ren, et al, ; Qian et al, ; Wang et al, ; Xu et al, ), high whole‐rock FC3MS values (here FC3MS = FeO/CaO – 3 * MgO/SiO 2 ; >0.65; Yang & Zhou, ; Yang et al, ), and high Fe/Mn (>60) and high 10,000 * Zn/Fe (>14) ratios (Liu et al, ; Xu et al, ; Zhang et al, ) suggest that these basalts (sensu lato) have pyroxenitic/eclogitic mantle sources. The distinct δ 18 O values of phenocrysts relative to typical mantle indicate that such pyroxenitic/eclogitic components may derive from subducted oceanic crusts and sediments (e.g., Liu, Xia, Deloule, et al, , Liu, Xia, Ingrin, et al, ; Liu, Wang, et al, ; Xu et al, ).…”

Section: Introductionmentioning

confidence: 99%

Light Mg Isotopic Composition in the Mantle Beyond the Big Mantle Wedge Beneath eastern Asia

Chen

Shi

et al. 2019

JGR Solid Earth

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Low‐δ26Mg basalts are commonly interpreted to represent melts derived from carbonated mantle sources. The mantle domain feeding low‐δ26Mg Cenozoic basalts in eastern China overlaps the so‐called Big Mantle Wedge (BMW) above the stagnant Pacific slab in the mantle transition zone, which indicates that the BMW is an important carbon reservoir generated by the slab. However, Mg isotopic composition in the nearby mantle beyond the BMW and, thus, the spatial extent of carbonated components in the mantle beneath eastern Asia have not yet been extensively characterized. Therefore, it remains largely unconstrained if additional or alternative carbon reservoirs exist. Here we carried out a geochemical study on Cenozoic Huihe nephelinites, which crop out ~500 km west of the present‐day BMW. These rocks are characterized by negative K, Zr, Hf, and Ti anomalies, high Zr/Hf, Ca/Al ratios, and low δ26Mg values, which suggest that they are derived from a carbonated mantle source. The composition of the nephelinites demonstrates that low δ26Mg mantle components exist at significant distances from the present‐day BMW, which highlights that in addition to the stagnant Pacific slab, other oceanic slab(s) also contribute(s) carbonate‐bearing crustal materials to the mantle sources of Cenozoic volcanism in eastern Asia.

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“…Global and regional tomographic results (Huang, ; Lebedev & Nolet, ) indicate that a clear low seismic wavespeed anomaly occurs beneath Hainan Island and likely extends to the lower mantle with an estimated radius of 40–80 km (Lei et al, ; Wei & Chen, ). Geochemical studies have shown that large quantities of extensive basaltic lava are observed in Hainan Island, which show the compositions of OIB and Dupal‐like enriched mantle type 2 isotopic signatures (Ho et al, ; Liu et al, ). These results together suggest the presence of the Hainan mantle plume.…”

Section: Introductionmentioning

confidence: 99%

Crustal Footprint of the Hainan Plume Beneath Southeast China

et al. 2018

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Although global and regional seismic tomography results have revealed the presence of a mantle plume beneath Hainan Island, there is little evidence for a hotspot track associated with the Hainan plume. Here a joint inversion of satellite gravity measurements and seismic surface wave dispersion data was performed, and the results show that a linear corridor of high seismic velocity anomalies beneath the crust is located northeast of Hainan Island beneath the Southeast China. Geodynamic modeling further demonstrates that this corridor could have been formed by the interactions between a mantle plume and the continental lithosphere with a weak lower crust. Volcanic age distributions of sporadic oceanic island basalts suggest that this track was likely formed since the late Cretaceous, which helps to constrain the averaged plate velocity of the South China Block, relative to the Hainan plume, to be ~1.8 cm/year to the northeast since 80 Ma. Our result provides a novel explanation for the crustal thickness variations, related Vs anomalies, and observed oceanic island basalts in this area. It also provides an independent way for constraining plate motion history of the continental lithosphere.

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Petrogenesis of Late Cenozoic basalts from North Hainan Island: Constraints from melt inclusions and their host olivines

Cited by 62 publications

References 127 publications

Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea

Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea

Light Mg Isotopic Composition in the Mantle Beyond the Big Mantle Wedge Beneath eastern Asia

Crustal Footprint of the Hainan Plume Beneath Southeast China

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