Opening of the South China Sea and upwelling of the Hainan Plume

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doi: 10.1002/2017GL076872
Author(s): Yu Mengming; Yan Yi; Huang Chiyue; Zhang Xinchang; Tian Zhixian; Chen Wenhuang; Santosh, M.
Author Affiliation(s): Primary:
Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Guangzhou, China
Other:
China University of Geosciences, China
Volume Title: Geophysical Research Letters
Source: Geophysical Research Letters, 45(6), p.2600-2609. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0094-8276 CODEN: GPRLAJ
Note: In English. 68 refs.; illus., incl. sketch maps
Summary: Opening of the South China Sea and upwelling of the Hainan Plume are among the most challenging issues related to the tectonic evolution of East Asia. However, when and how the Hainan Plume affected the opening of the South China Sea remains unclear. Here we investigate the geochemical and isotopic features of the ∼25 Ma mid-ocean ridge basalt (MORB) in the Kenting Melange, southern Taiwan, ∼16 Ma MORB drilled by the IODP Expedition 349, and ∼9 Ma ocean island basalt-type dredged seamount basalt. The ∼25 Ma MORBs reveal a less metasomatic depleted MORB mantle-like source. In contrast, the Miocene samples record progressive mantle enrichment and possibly signal the contribution of the Hainan Plume. We speculate that MORBs of the South China Sea which could have recorded plume-ridge source mixing perhaps appear since ∼23.8 Ma. On the contrary, the Paleocene-Eocene ocean island basalt-type intraplate volcanism of the South China continental margin is correlated to decompression melting of a passively upwelling fertile asthenosphere due to continental rifting. Abstract Copyright (2018), . American Geophysical Union. All Rights Reserved.
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
ODP Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; 18 Geophysics, Solid-Earth; Asia; Basalts; Cenozoic; China; Depletion; Enrichment; Expedition 349; Far East; Geochemistry; Hainan China; Hainan Plume; IODP Site U1431; IODP Site U1433; IODP Site U1434; Igneous rocks; International Ocean Discovery Program; Kenting Melange; Leg 184; Mantle; Mantle plumes; Metasomatism; Mid-ocean ridge basalts; Miocene; Neogene; North Pacific; Northwest Pacific; ODP Site 1148; Ocean Drilling Program; Ocean-island basalts; Oligocene; Pacific Ocean; Paleogene; Petrography; Plate tectonics; Sea-floor spreading; South China Sea; Spreading centers; Taiwan; Tertiary; Upper Oligocene; Upwelling; Volcanic rocks; West Pacific
Coordinates: N125500 N183400 E1170100 E1145500
N185010 N185010 E1163356 E1163356
Record ID: 2018052677
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom