Generation of Cenozoic intraplate basalts in the big mantle wedge under eastern Asia

Xu, Yi–Gang; Li, Hongyan; Hong, Lu-Bing; Ma, Liang; Ma, Qiang; Sun, Ming-Dao

doi:10.1007/s11430-017-9192-y

Cited by 115 publications

(76 citation statements)

References 109 publications

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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%

“…The present‐day subducted Pacific slab has been seismically detected in the mantle transition zone beneath eastern Asia, with its western edge extending to about 120°E longitude, where it roughly coincides with the eastern margin of the Daxing'anling‐Taihang Gravity Lineament (DTGL; Figure ; Huang & Zhao, ; Wei et al, ). The region above this stagnant slab has been termed the “Big Mantle Wedge” (BMW; Zhao et al, ), which extends to over 1,000 km from the trench, where the BMW and the crustal section above are considered as an intraplate setting (Xu et al, ). Cenozoic basalts occurring to the east of the DTGL in eastern China have consistently light Mg isotopic compositions and define a large low δ 26 Mg anomaly within the BMW (δ 26 Mg = −0.60‰ to −0.34‰; Huang, Li, et al, ; Tian et al, ; Wang et al, ; Yang et al, ; Sun, Teng, et al, ; Su et al, ; Li et al, ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…Seismic tomography shows that the Pacific plate, which is characterized by positive wave anomalies ( dV S and dV P of up to +6% and +4%), stagnates at a depth of ~400–700 km below Eastern China, Russia, North Korea and South Korea, currently extending to ~120–130 °E (Figures a and b; Chen et al, ; Huang & Zhao, ; Tang et al, ). When exactly the stagnant Pacific slab has developed is a point of debate (e.g., Kimura et al, ; X. Liu et al, ; Xu et al, ), but kinematic reconstructions suggest that the slab has ponded in the mantle transition zone for at least 25 Ma, following subduction, flat slab stagnation, and slab break‐off of the Izanagi plate at >35 Ma (Jolivet et al, ; Kimura et al, ). The flat slab of the Pacific plate has grown in extent since ≥25 Ma, while its edge has remained close to the western border of present‐day Mongolia (Jolivet et al, ; Kimura et al, ), where Eastern Asia's lithosphere has moved essentially on a N‐S trajectory for at least ~40 Ma (Jolivet et al, ).…”

Section: Background and Geological Settingmentioning

confidence: 99%

“…The Cenozoic magmatism above the big mantle wedge, with over 500 volcanic centers, is predominantly sodic basaltic, where melts are inferred to have formed in the asthenosphere from depleted sources with minor contributions from enriched components (Figure a; Chen et al, ; Wang et al, ; Xu et al, ; Zou et al, ). The largest volcanic centers occur along lithosphere‐scale fault systems and above parts of the subducted Pacific plate where breaks or other zones of weakness are present, which are inferred to have promoted upwelling from the mantle transition zone and possibly permitted upwelling from the lower mantle through slab breaks (Faccenna et al, ; Tang et al, ).…”

Section: Background and Geological Settingmentioning

confidence: 99%

“…Low S and P wave velocity anomalies extend from the top of the mantle transition zone, and possibly from the deep mantle, to several of the Cenozoic volcanic centers (e.g., at Changbaishan, Wudalianchi, Halaha; Figure a), suggesting a close relation between the mantle transition zone and the wide‐spread volcanism (Chen et al, ; Huang & Zhao, ; Kimura et al, ; Tang et al, ; Wei et al, ; Zhao, ). Many geochemical studies have further shown that enriched mantle components play an important role in the formation of the magmas, which are thought to derive from the stagnant Pacific slab and/or from ancient subducted slabs (Kimura et al, ; Kuritani et al, , ; Tang et al, ; Wang et al, ; Xu et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Hot, volatile‐poor, and oxidized magmatism above the stagnant Pacific plate in Eastern China in the Cenozoic

Erdmann

Chen

Liu

et al. 2019

Geochem Geophys Geosyst

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Eastern China has experienced widespread and voluminous, basaltic to andesitic intraplate magmatism in the Cenozoic. Seismic tomography and kinematic reconstructions show that magmas have erupted above the stagnant Pacific plate, which currently extends within the mantle transition zone for >1500 km beyond the active arc. Seismic studies also show in intriguing detail that low‐velocity wave anomalies reach from the mantle transition zone or below to major volcanic centers, suggesting an intimate relation between the magmatism and components derived from the mantle‐transition zone and possibly from deeper levels. Here, we provide new petrological, mineral chemical, and whole‐rock geochemical data showing that Cenozoic basaltic andesitic and andesitic magmas that have erupted above the present‐day edge of the subducted Pacific plate are largely unfractionated, ≥1130‐1160±15‐50 °C hot, mantle‐derived melts that were volatile‐poor (undegassed melt CO2 and H2O of ~2400‐3100±500 ppm and ~0.5‐0.6±0.4‐1.1 wt%), and relatively oxidized (~FMQ to ~FMQ+1.3±1.0). We further infer that the magmas were derived by partial melting of oxidized, H2O‐ and CO2‐poor eclogite‐rich sources (~FMQ‐1.0 to ~FMQ). We use this to suggest that the low‐velocity seismic anomalies below Eastern China largely reflect the presence of oxidized and enriched, hot and not necessarily particularly hydrous mantle domains as common interpretation has suggested. This is crucial information for quantifying material flow above and around the subducted Pacific plate and for constraining residence times of subducted components in Eastern Asia and globally.

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Phantom recycled carbonates and mantle pyroxenites: insight from the low-δ26Mg intraplate basaltic province across central-eastern Asia

Dai

Zheng

Xiong

et al. 2022

Preprint

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Mass recycling from subduction to magmatic extrusion shapes our habitable environment and Earth's interior. Subducted igneous crust may form pyroxenites before participating magmatism, but the deep journey of associated carbonates remains unclear. Here we report new Mg-isotope data for ˜89 to 81 Ma basaltic rocks in Langshan area, central Asia (δ 26 Mg = -0.391 to -0.513 synthesis for post-110 Ma basalts across eastern Asian continent. The merged low-δ 26 Mg basaltic province normally interpreted as derivations from carbonated sources paradoxically displays geochemical signatures (low Ca/Al and high K 2 O contents) resembling partial melts of uncarbonated sources. Negative correlations of δ 26 Mg vs TiO 2 and FCKANTMS, the proxy of pyroxenitic melts, and adiabatic melting modeling suggest presence of Mg-isotopically light source pyroxenites transformed from decarbonated altered oceanic crust. This may explain ubiquitous pyroxenitic contributions in many low-δ 26 Mg basaltic suites and has significant implication for deep carbon cycling. Hosted fileessoar.10512814.1.docx available at https://authorea.com/users/563886/articles/610974phantom-recycled-carbonates-and-mantle-pyroxenites-insight-from-the-low-%CE%B426mgintraplate-basaltic-province-across-central-eastern-asia Phantom recycled carbonates and mantle pyroxenites: insight from the low-26 Mg intraplate basaltic province across central-eastern Asia

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Generation of Cenozoic intraplate basalts in the big mantle wedge under eastern Asia

Cited by 115 publications

References 109 publications

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

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

Hot, volatile‐poor, and oxidized magmatism above the stagnant Pacific plate in Eastern China in the Cenozoic

Phantom recycled carbonates and mantle pyroxenites: insight from the low-δ26Mg intraplate basaltic province across central-eastern Asia

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