Geochemistry and petrogenesis of Late Permian basalts from the Sichuan Basin, SW China: Implications for the geodynamics of the Emeishan mantle plume

Meng, Fanchao; Tian, Yulu; Kerr, Andrew C.; Wang, Wei; Wu, Zucheng; Xu, Qiang; Du, Qing; Zhou, Yaoqi; Liu, Jiaqi

doi:10.1016/j.jseaes.2022.105477

Cited by 6 publications

(5 citation statements)

References 102 publications

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“…The occurrence of voluminous mafic pyroclastic rocks near the base of the Gufeng Formation (Maocaojie section; Figure 1b; Niu et al, 2000) is consistent with mantle plume activity in the region. Following the formation of the E'Xi rift basin in the late Permian, the lithosphere moved northeastwards above a stationary mantle plume that is recorded by its NE–SW‐trending surface expression, including high seismic velocities and negative radial anisotropy (Liu et al, 2021), a residual gravity anomaly (Deng et al, 2014), basalts (Meng et al, 2022; Shao et al, 2022), methane emissions (Chen et al, 2022), source rock maturity in the Sichuan Basin (Feng et al, 2022), and northward motion of the SCB in plate reconstruction models (Huang et al, 2018). At ca.…”

Section: Discussionmentioning

confidence: 99%

Age and origin of a Guadalupian tuff in the E'Xi rift basin in South China: Evidence for the Emeishan continental hotspot track?

Qiu

Zheng

et al. 2023

Terra Nova

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Unlike oceanic hotspot tracks, continental hotspot tracks are difficult to recognise, although they can provide unique insights into crustal deformation and intraplate magmatism. Here, we present whole‐rock geochemical and Sr–Nd isotope, and zircon U–Pb age and Hf isotope data for a tuff from the E'Xi rift basin in the South China Block. The zircons yielded a 206Pb/238U age of 267.0 ± 2.0 Ma, which coincides with the Roadian–Wordian boundary. The whole‐rock geochemical and Sr–Nd isotope data for the tuff indicate it had a mixed mantle–crust source. The zircon trace element and εHf(t) (−6.32 to +7.06) data are also consistent with such a source. Based on the sedimentological and tectonic history, and the geochronology and geochemistry of the tuff, we propose the tuff erupted in a rift and records the hidden hotspot track of the Emeishan mantle plume beneath the northern SCB.

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Section: Discussionmentioning

confidence: 99%

Age and origin of a Guadalupian tuff in the E'Xi rift basin in South China: Evidence for the Emeishan continental hotspot track?

Qiu

Zheng

et al. 2023

Terra Nova

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“…The mantle plume hypothesis has been widely adopted to explain the origins of large igneous provinces, and sedimentologic, geophysical, and geochemical evidence has proven that the ELIP was caused by EMP activity [56][57][58]. Mantle plume activity is a process in which high-temperature material arches up causing the crust to uplift and rupture, and the high-temperature material finally erupts to form basalt [59][60][61][62][63].…”

Section: Emp Activity and The Elipmentioning

confidence: 99%

The Effect of the Emeishan Mantle Plume on the Genetic Mechanism of the Maokou Formation Reservoir in the Central Sichuan Region

Guo,

Li,

Guo

et al. 2024

Minerals

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Thin layers and high-yield dolomite reservoirs were recently discovered in the Permian Guadeloupian Maokou Formation. The genetic mechanism of this reservoir is controversial because of its complex sedimentation and diagenesis in the Maokou Formation. Traditionally, the genesis has focused on sedimentation, karst, and fracture, whereas the influence of the Emeishan mantle plume activity (EMP) has been ignored. In this study, we enumerated petrographic (grouped into micritic bioclastic limestone, limy dolomite, grain dolomite, dolomite cement, calcite cement, and saddle dolomite) and geochemical data (δ13C, δ18O, REE, and 87Sr/86Sr) from a microscopic perspective to support the impact of EMP on reservoirs. We conclude that EMP activity altered the sedimentary environment and induced a complex diagenesis. The paleogeomorphic reconstruction data indicate that the EMP caused an uplift zone in the NE–SW direction, depositing advantageous high-energy beach facies. In terms of diagenesis, the abnormally high 87Sr/86Sr ratios and REE with positive Eu anomalies suggest that dolomitization was influenced by both seawater and hydrothermal fluids. Based on the above evidence, we established a reservoir genetic model for the Maokou Formation related to the intensity of the EMP. This study provides a new perspective on the mantle plume activity for the study of carbonate reservoir genesis.

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“…In the δD-δ 18 O H2O relationship diagram (Figure 8), H and O isotopes are mainly distributed among metamorphic water, primary magmatic water, and organic matter fluid, with a tendency towards organic matter fluid. However, the magmatic rocks around the ore district are mainly Emeishan basalt (approximately 260 Ma) [29][30][31][32][33][34], which is 50 Ma older than the main ore-forming age of the Pb-Zn deposits in the region (approximately 200 Ma) [35][36][37]. Therefore, magmatic water cannot be used as a direct source of the oreforming fluids.…”

Section: Sources Of Ore-forming Fluidsmentioning

confidence: 99%

Metallogenesis and Formation of the Maliping Pb-Zn Deposit in Northeastern Yunnan: Constraints from H-O Isotopes, Fluid Inclusions, and Trace Elements

et al. 2023

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The Maliping large-scale Pb-Zn deposit is located in the Sichuan-Yunnan-Guizhou Pb-Zn polymetallic metallogenic triangle area (SYGT), where the Pb-Zn ore body is hosted in the interlayer fracture zone at the interface between siliceous cataclastic dolomite and clastic rocks in the Lower Cambrian Yuhuchun Formation and is tectonically driven. Unlike other Pb-Zn de-posits hosted in the Sinian and Carboniferous carbonate rocks in the area, the metallogenic mechanism and deep and peripheral ore prospecting prediction research require further exploration. In this study, representative samples of a typical orebody profile were systematically collected, and microthermometry of fluid inclusions and H-O isotopes and metal sulfide trace element analyses were performed. The main findings were as follows: (1) The fluid inclusion study showed that the ore-forming fluids have vapor-rich phase reduction characteristics of medium-low temperature, salinity, and density. (2) H-O isotopic studies showed that the ore-forming fluids are derived from the mixing of deep-source fluids flowing through the deep fold basement (Kunyang Group) and or-ganic-containing basin brine. (3) Rare earth element (REE) characteristics indicate that the ore-forming materials were primarily derived from the folded basement (Kunyang Group). (4) The trace element study showed that sphalerite is relatively enriched in Cu, Cd, Ga, and Ge, while depleted in Fe, Mn, Sn, and Co, similar to the typical Huize-type (HZT) Pb-Zn deposit in the area. Therefore, it is suitable to explore the deposit using a large-scale “four step style” ore prospecting method for ore prospecting and prediction. Moreover, the results provide a reference for the study of Pb-Zn metallogenic systems and new ideas for the deep and peripheral prospecting of Pb-Zn deposits in this area.

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Geochemistry and petrogenesis of Late Permian basalts from the Sichuan Basin, SW China: Implications for the geodynamics of the Emeishan mantle plume

Cited by 6 publications

References 102 publications

Age and origin of a Guadalupian tuff in the E'Xi rift basin in South China: Evidence for the Emeishan continental hotspot track?

Age and origin of a Guadalupian tuff in the E'Xi rift basin in South China: Evidence for the Emeishan continental hotspot track?

The Effect of the Emeishan Mantle Plume on the Genetic Mechanism of the Maokou Formation Reservoir in the Central Sichuan Region

Metallogenesis and Formation of the Maliping Pb-Zn Deposit in Northeastern Yunnan: Constraints from H-O Isotopes, Fluid Inclusions, and Trace Elements

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