New Insights into the Mesozoic Large‐scale Intra‐plate Magmatism and Mineralization in South China from Seismic Tomography

Shi, Dan; Lü, Qingtian; Shen, Yang; Xu, Xiaoming; ZHANG, Yongqian; Xu, Yang; Zhao, Jun‐Hong; Yu-min, GU; Shi, Jianyu; Chen, Changxin

doi:10.1111/1755-6724.15056

Cited by 3 publications

(3 citation statements)

References 57 publications

(111 reference statements)

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“…A recent tomographic study (Shi et al., 2023) conducted in the southeastern margin of Eurasia with a great amount of S‐wave data reveals a prominent, broad low‐velocity feature in and below the mantle transition zone (MTZ) beneath the SCS, which is interpreted to be an upwelling mantle plume structure. Combining evidence from receiver function observations of a relatively thinner MTZ beneath this region (Wei & Chen, 2016; Yu et al., 2017), we speculate that the upper mantle plume is likely to be sourced directly from the lower mantle.…”

Section: Resultsmentioning

confidence: 99%

“…A recent tomographic study (Shi et al, 2023) conducted in the southeastern margin of Eurasia with a great amount of S-wave data reveals a prominent, broad low-velocity feature in and below the mantle transition zone The large-scale sub-vertical conduit located right below the central SABP is interpreted to be the major mantle upwelling trunk that is likely to feed the surface intraplate volcanism. The magenta patches that depict the surface coverage of the Late Cenozoic basaltic volcanism within the SABP and the green dashed circle that marks the surficial extent of the SABP are the same as shown in Figure 1a.…”

Section: Deep Origin Of the Post-spreading Intraplate Volcanismmentioning

confidence: 99%

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Focused Mantle Upwelling Beneath the Southeastern Asian Basalt Province Revealed by Seismic Surface Wave Tomography

Fan,

Guo,

Chen

et al. 2024

Geophysical Research Letters

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Following the termination of seafloor spreading in the South China Sea (SCS) basin, abundant intraplate volcanism widely spreads in the Indochina block, SCS basin, and Leiqiong area, forming the Southeastern Asian Basalt Province (SABP). The geodynamic origin of the SABP has long been enigmatic and debated. Here, we present a high‐resolution 3‐D upper mantle S‐wave velocity model in the region by conducting earthquake‐based surface wave tomography with seismic data collected across Southeast Asia. The resultant images depict a plume‐like structure beneath the central area of the SABP, characterized by a continuous, sub‐vertical low‐velocity column in the upper mantle. Our new findings, combined with previous geochemical and geodynamic evidence, suggest that the extensive post‐spreading intraplate volcanism within the SABP is likely induced by this focused mantle upwelling, which could be further traced down to the core‐mantle boundary as inferred by existing global velocity models.

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Section: Resultsmentioning

confidence: 99%

Section: Deep Origin Of the Post-spreading Intraplate Volcanismmentioning

confidence: 99%

Focused Mantle Upwelling Beneath the Southeastern Asian Basalt Province Revealed by Seismic Surface Wave Tomography

Fan,

Guo,

Chen

et al. 2024

Geophysical Research Letters

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“…

Shi et al, 2023). Cretaceous magmatism in South China is generally attributed to be Paleo-Pacific subduction-related, as evidenced by the NE-trending distribution of coeval magmatic rocks along the coastal region (

…”

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confidence: 99%

Early Cretaceous Metasomatized Lithospheric Mantle beneath the Central Jiangnan Orogen in South China: Geochemical and Sr‐Nd Isotope Evidence from the Tuanshanbei Dolerite

WANG,

WEI,

LIU

et al. 2024

Acta Geologica Sinica (Eng)

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It is well established that Cretaceous magmatism in the South China Block (SCB) is related to the Paleo‐Pacific subduction. However, the starting time and the associated deep crust‐mantle processes are still debatable. Mafic dike swarms carry important information on the deep earth (incl. mantle) geodynamics and geochemical evolution. In the Jiangnan Orogen (South China), there is no information on whether the Mesozoic magmatic activities in this region are also directly related to the Pacific subduction or not. In this study, we present detailed zircon U‐Pb geochronological, whole‐rock element and Sr‐Nd isotope data for Early Cretaceous Tuanshanbei dolerite dikes, and provide new constraints on the condition of the lithospheric mantle and mantle dynamics of the SCB during that time. LA‐ICP‐MS zircon U‐Pb dating suggests that this dolerite erupted in the Early Cretaceous (∼145 Ma). All samples have alkaline geochemical affinities with K2O+Na2O = 3.11–4.04 wt%, K2O/Na2O = 0.50–0.72, and Mg# = 62.24–65.13. They are enriched in LILE but are depleted in HFSE with higher initial 87Sr/86Sr (0.706896–0.714743) and lower ɛNd(t) (–2.61 to –1.67). They have high Nb/U (27.41–38.34), Nb/La (0.90–1.09), La/Sm (5.42–5.79) and Rb/Sr (0.12–0.18), and low La/Nb (0.92–1.11), La/Ta (15.8–17.3), Ce/Pb (5.11–14.29), Ba/Rb (5.14–8.85), Tb/Yb (0.29–0.31) and Gd/Yb (1.71–1.85) ratios. Such geochemical signatures suggest that the fractional crystallization is obvious but crustal contamination play a negligible role during magmatic evolution. Tuanshanbei dolerite were most likely derived from low‐degree (2–5%) partial melting of a phlogopite‐bearing mantle material consisted of ∼85% spinel peridotite and ∼15% garnet peridotite previously metasomatized by asthenosphere‐derived fluids/melts with minor subduction‐derived fluids/melts. Slab‐rollback generally lead to the upwelling of the hot asthenosphere. The upwelling of asthenosphere consuming the lithospheric mantle by thermo‐mechanical‐chemical erosion. The lithospheric mantle may have partially melted due to the heating by the upwelling asthenosphere and lithospheric extension. It is inferred that the Tuanshanbei dolerite suggest that the initial slab rollback and corresponding lithospheric extension occurred potentially at ca. 145 Ma.

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Garnet and Zircon U‐Pb Geochronology and Geochemistry Reveal Genesis of the Dafang Au‐Pb‐Zn‐Ag Deposit, Southern Hunan

JIANG,

KONG,

LIU

et al. 2024

Acta Geologica Sinica (Eng)

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Garnet is a primary mineral in skarn deposits and plays a significant role in recording copious mineralization and metallogenic information. This study systematically investigates the geochemistry and geochronology of garnet and zircon in the Dafang Au‐Pb‐Zn‐Ag deposit, which represents prominent gold mineralization in southern Hunan, China. Garnet samples with distinct zoning patterns and compositional variations were identified using various analytical techniques, including Backscattered Electron (BSE) imaging, Cathodoluminescence (CL) response, textural characterization, and analysis of rare‐earth elements (REE), major contents, and trace element compositions. The garnet was dated U‐Pb dating, which yielded a lower intercept age of 161.06 ± 1.93 Ma. This age is older than the underlying granodiorite porphyry, which has a concordia age of 155.13 ± 0.95 Ma determined by zircon U‐Pb dating. These results suggest that the gold mineralization may be related to the concealed granite. Two groups of garnet changed from depleted Al garnet to enriched Al garnet, and the rare earth element (REE) patterns of these groups were converted from light REE (LREE)‐enriched and heavy REE (HREE)‐depleted with positive europium (Eu) anomalies to medium REE (MREE)‐enriched from core to rim zoning. The different REE patterns of garnet in various zones may be attributed to changes in the fluid environment and late superposition alteration. The development of distal skarn in the southern Hunan could be a significant indicator for identifying gold mineralization.

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New Insights into the Mesozoic Large‐scale Intra‐plate Magmatism and Mineralization in South China from Seismic Tomography

Cited by 3 publications

References 57 publications

Focused Mantle Upwelling Beneath the Southeastern Asian Basalt Province Revealed by Seismic Surface Wave Tomography

Focused Mantle Upwelling Beneath the Southeastern Asian Basalt Province Revealed by Seismic Surface Wave Tomography

Early Cretaceous Metasomatized Lithospheric Mantle beneath the Central Jiangnan Orogen in South China: Geochemical and Sr‐Nd Isotope Evidence from the Tuanshanbei Dolerite

Garnet and Zircon U‐Pb Geochronology and Geochemistry Reveal Genesis of the Dafang Au‐Pb‐Zn‐Ag Deposit, Southern Hunan

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