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• W2555068624 endingPage "308" @default.
• W2555068624 startingPage "293" @default.
• W2555068624 abstract "Abstract We report the finding of a ∼20 m thick sequence of massive pyroxene–plagioclase–phyric basalt lava flows in the Yanghe area of the northeastern Sichuan Basin, within the Yangtze craton of SW China, which were previously considered to be located outside the Emeishan flood basalt province. This basaltic sequence above the middle Permian Maokou Formation (Fm.) is overlain by the late Permian Longtan Fm. Thus, the Yanghe basalts should be stratigraphically correlated with the Emeishan flood basalts. The Yanghe basalts show typical oceanic island basalt (OIB) affinity, and geochemically resemble Emeishan basalts, especially in the case of high-Ti (HT) basalts from the eastern domain of the Emeishan flood basalt province. The rocks have low age-corrected (87Sr/86Sr)t (t = 260 Ma) ratios (0.704158–0.704929) and Pb isotopic ratios [206Pb/204Pb(t) (18.264–18.524), 207Pb/204Pb(t) (15.543–15.58), and 208Pb/204Pb(t) (38.147–38.519)], and positive eNd(t) values (+3.15 to +3.61), suggesting that the lavas have not undergone any significant crustal contamination. The crystallization temperature of clinopyroxene is estimated to be 1368–1420 °C, suggesting anomalously thermal inputs from a mantle source and a possible plume-head origin. The fractionation of middle rare earth elements (MREE) to heavy REE (HREE) suggests that these rocks were produced by small degrees of partial melting of mantle peridotite within the garnet–spinel transition region. The stratigraphic relationships and similar geochemical signatures with the Emeishan flood basalts suggest that the Yanghe basalts are part of the Emeishan flood basalt province and can be considered as the northeastern limit of the Emeishan flood basalt province. Our finding extends the diameter of the Emeishan flood basalt province to ∼1200–1400 km, covering an area of up to ∼7 × 105 km2, two times more than previously estimated. The larger areal extent and giant eruption volume, incorporating the Sichuan Basin, lend support to the correlation between the end-Guadalupian mass extinction and the Emeishan flood basalt province." @default.
• W2555068624 created "2016-11-30" @default.
• W2555068624 creator A5000573728 @default.
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• W2555068624 creator A5044298413 @default.
• W2555068624 creator A5061818383 @default.
• W2555068624 creator A5077071692 @default.
• W2555068624 date "2017-02-01" @default.
• W2555068624 modified "2023-10-18" @default.
• W2555068624 title "Late Permian basalts in the Yanghe area, eastern Sichuan Province, SW China: Implications for the geodynamics of the Emeishan flood basalt province and Permian global mass extinction" @default.
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