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- W2895095938 abstract "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 20wt.% 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." @default.
- W2895095938 created "2018-10-12" @default.
- W2895095938 creator A5060844794 @default.
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- W2895095938 date "2018-11-01" @default.
- W2895095938 modified "2023-10-16" @default.
- W2895095938 title "Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea" @default.
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- W2895095938 doi "https://doi.org/10.1029/2018gc007570" @default.
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