Post-rift magmatism on the northern South China Sea margin

Sun Qiliang; Alves Tiago M.; Zhao Minghui; Sibuet Jean-Claude; Calves Gerome; Xie Xinong

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Post-rift magmatism on the northern South China Sea margin

机译：南海北部河北海底山地山地边缘

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Intense magmatism in the form of widespread volcanoes and lava flows is identified in high-resolution 3-D seismic data over a post-rift sequence of the northern South China Sea (SCS). Such a magmatism post-dates the end of seafloor spreading in the SCS by at least 6.8 m.y. A detachment (boundary) fault propagating into a deep-seated magma chamber provided the main vertical pathway for magma migration. In turn, normal faults and dykes constituted a shallow plumbing system through which the magma migrated from the boundary fault and was extruded onto the paleo-seafloor. Volcanism occurred in the study area from ca. 8.2 Ma to ca. 1.1 Ma in the form of two distinct events, dated ca. 5.2 Ma and ca. 2.8 Ma, which are correlated with the Dong-sha Event. Extrusive magma formed volcano edifices and extensive lava flows; the latter of which were confined to the troughs of sediment waves or, instead, flowed along submarine canyons. As a corollary, this study shows that in the SCS: (1) young magmatism is wide-spread on the northern continental margin, (2) seafloor morphology greatly influences the architecture of deep-water volcanoes, and (3) syn-rift faults (especially detachment faults) reactivated by regional tectonics closely control the magma plumbing systems.

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来源
《Geological Society of America Bulletin》 |2020年第12期|共15页
作者
Sun Qiliang; Alves Tiago M.; Zhao Minghui; Sibuet Jean-Claude; Calves Gerome; Xie Xinong;
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作者单位

China Univ Geosci Wuhan Key Lab Tecton &

Petr Resources Minist Educ Wuhan 430074 Peoples R China;

Cardiff Univ Sch Earth &

Ocean Sci 3D Seism Lab Main Bldg Pk Pl Cardiff CF10 3AT Wales;

Chinese Acad Sci Innovat Acad South China Sea Ecol &

Environm Engn South China Sea Inst Oceanol Key Lab Ocean &

Marginal Sea Geol Guangzhou 510301 Peoples R China;

Ifremer Ctr Brest F-29280 Plouzane France;

Univ Toulouse 3 Paul Sabatier OMP GET F-31400 Toulouse France;

China Univ Geosci Wuhan Key Lab Tecton &

Petr Resources Minist Educ Wuhan 430074 Peoples R China;

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正文语种 eng
中图分类地质学;
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Post-rift magmatism on the northern South China Sea margin

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