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- W3086821087 abstract "Late Cenozoic continental rifting and breakup separated the southern margin of the South China Sea (SCS) from the northern margin. It remains unknown whether the high-density/velocity zones (HVZs) in the lower crust extend southwards from the northeastern margin of the SCS to the conjugate southern margin. We integrated two newly acquired and processed multichannel seismic reflection profiles with gravity and magnetic data across the Liyue (Reed) Bank and north Palawan basin to clarify the characteristics of crustal structure and their relationship to post-rift magmatism. Our results show an asymmetric distribution of the HVZs in the conjugate margins. The lower crust anomalous reflections are isolated and mostly restricted in the areas of the ocean-continent transition (OCT) and the distal sag. In gravity modeling, the crustal thickness decreases from ~20 km in the proximal sag to a minimum of ~6 km in the distal sag, and these anomalous reflections spatially correspond to high-density zones no more than 4 km in thickness. The magmatic features are presented by igneous intrusions at the top of the basement that deform post-rift strata in the Early Miocene. These HVZs, above which the crustal stretching factor is 3.3–5.8, support that an anomalously hot asthenospheric mantle persisted during lithospheric thinning, resulting in magmatic underplating and density drop in the uppermost mantle during early breakup." @default.
- W3086821087 created "2020-09-21" @default.
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- W3086821087 date "2020-12-01" @default.
- W3086821087 modified "2023-10-13" @default.
- W3086821087 title "Anomalous lower crustal structure and origin of magmatism in the southeastern margin of the South China Sea" @default.
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- W3086821087 doi "https://doi.org/10.1016/j.marpetgeo.2020.104711" @default.
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