Age and geochemical characteristics of Paleogene basalts drilled from western Taiwan: Records of initial rifting at the southeastern Eurasian continental margin

Wang, K.; Chung, Sun‐Lin; Lo, Yi‐Chun; Lo, Ching–Hua; Yang, Huai Jen; Shinjo, Ryuichi; Lee, T.; Wu, Jing; Huang, Shipeng

doi:10.1016/j.lithos.2012.10.002

Cited by 41 publications

(42 citation statements)

References 48 publications

(107 reference statements)

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“…In terms of the SiO 2 content, these rocks display relatively low Mg (MgO ≈ 3.9 ~ 5.3 wt.%) and Mg-value (≈ 41 ~ 49) in comparison with the Miocene basalts in the Taiwan Strait and NW Taiwan ( Fig. 4; Chung et al 1994Chung et al , 1995Wang et al 2012). They are similar to basalts from the Scarborough Seamounts in the SCS basin (Tu et al 1992) which have experienced fractional crystallization to a minor extent (Fig.…”

Section: Major-element Compositionsmentioning

confidence: 88%

“…1) located at coordinates 21°10'N and 119°12'E by Yeh et al (2010) to initiate a detailed geochemical investigation, including whole-rock major-and trace-element, and Sr-NdPb isotope determinations in this study. Geochemical data including seamounts in the SCS basin (SCS seamounts; Tu et al 1992), the Eocene volcanic rocks drilled in the Taiwan Strait and onland Taiwan (Wang et al 2012), and Miocene intraplate basalts in the Penghu Islands (Chung et al 1994(Chung et al , 1995 are also included in this paper for comparison. Three dredged samples are remarkably fresh and all are aphyric basalts.…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

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Age and Geochemical Features of Dredged Basalts from Offshore SW Taiwan: The Coincidence of Intra-Plate Magmatism with the Spreading South China Sea

Wang¹,

Lo²,

Chung³

et al. 2012

Terr. Atmos. Ocean. Sci.

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This study reports age and geochemical analyses of basaltic rocks dredged from volcanic seamounts offshore SW Taiwan. 40 Ar/ 39Ar dating results of these rocks show them to be of the early Miocene age of ~22 -21 Ma. They are evolved alkali basalts that show OIB-type geochemical features similar to post-spreading seamount basalts (14 -3.5 Ma) in the South China Sea (SCS) and Miocene intraplate basalts on the Penghu Islands (16 -8 Ma) and NW Taiwan (23 -9 Ma). Their Sr-Nd-Pb isotope data plot within the range of the SCS seamount basalts that show an EM2-like component in the mantle source. The age and overall geochemical characteristics of the dredged basalts are comparable to those of the Kungkuan basalts, NW Taiwan and Baolai basalts, SW Taiwan, suggesting an extensive alkali basaltic volcanism along the southeastern Eurasian continental margin during the early Miocene that resulted from regional lithospheric extension in association with seafloor spreading in the South China Sea.

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Section: Major-element Compositionsmentioning

confidence: 88%

Section: Samples and Analytical Methodsmentioning

confidence: 99%

Age and Geochemical Features of Dredged Basalts from Offshore SW Taiwan: The Coincidence of Intra-Plate Magmatism with the Spreading South China Sea

Wang¹,

Lo²,

Chung³

et al. 2012

Terr. Atmos. Ocean. Sci.

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“…In geochemical studies, the rocks showed typical arc signatures such as calc‐alkaline features [ Wang et al ., ] analogous to those in southeast China [ Zhou and Li , ; Wu et al ., ] and are reportedly associated with subduction of the paleo‐Pacific plate [ Li and Li , ; Wang et al ., ; Yan et al ., ] in terms of time and space. Prior to the Eocene, a subduction‐related component (enriched mantle 2) resided in the lithospheric mantle of western Taiwan, but it was eliminated by Eocene basalts [ Wang et al ., ]. Plenty of petrological and geochemical data in the PRMB and western Taiwan documented an arc happened here, which makes it highly persuasive of the HVL beneath the PRMB is arc related.…”

Section: Discussionmentioning

confidence: 99%

Deep seismic structure of the northeastern South China Sea: Origin of a high‐velocity layer in the lower crust

et al. 2017

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We present a 2‐D seismic tomographic image of the crustal structure along the OBS2012 profile, which delineates the Moho morphology and magmatic features of the northeastern South China Sea margin. The image was created by forward modeling (RayInvr) and traveltime tomographic inversion (Tomo2D). Overall, the continental crust thins seaward from ~27 km to ~21 km within the continental shelf across the Zhu I Depression and Dongsha Rise, with slight local thickening beneath the Dongsha Rise accompanying the increase in the Moho depth. The Dongsha Rise is also characterized by ~4–7 km thick high‐velocity layer (HVL) (~7.0–7.6 km/s) in the lower crust and exhibits a relatively high velocity (~5.5–6.4 km/s) in the upper crust with a velocity gradient lower than those of the Zhu I Depression and Tainan Basin. Across the continental slope and continent‐ocean transition (COT), which contain the Tainan Basin, the crust sharply thins from 20 km to 10 km seaward and a ~2–3 km thick HVL is imaged in the lower crust. We observed that volcanoes are located only within the COT, but none exist in the continental shelf; the Dongsha Rise exhibits a high magnetic anomaly zone and different geochemical characteristics from the COT. Based on those observations, we conclude that the HVL underlying the COT is probably extension related resulting from the decompression melting in the Cenozoic, whereas the HVL beneath the Dongsha Rise is probably arc related and associated with the subduction of the paleo‐Pacific plate. These findings are inconsistent with those of some previous studies.

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“…Younger volcanic rocks sampled from a series of cones and mounds along the outer part of the margin have compositions similar to ocean island basalts. A similar change from mafic rocks related to rifting of continental lithosphere to those with a more asthenospheric mantle source are described from the southeastern Eurasian continental margin near Taiwan and are related to the opening of the South China Sea (Wang et al, 2012).…”

Section: Discussionmentioning

confidence: 59%

“…Wilson, 1989;Wang et al, 2012). Slight depletion in Nb and Ti may reflect the mantle source having retained a signature from a much earlier phase of subductionrelated metasomatism (e.g.…”

Section: Discussionmentioning

confidence: 99%

Multiple sources for volcanic rocks dredged from the Western Australian rifted margin

et al. 2015

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Age and geochemical characteristics of Paleogene basalts drilled from western Taiwan: Records of initial rifting at the southeastern Eurasian continental margin

Cited by 41 publications

References 48 publications

Age and Geochemical Features of Dredged Basalts from Offshore SW Taiwan: The Coincidence of Intra-Plate Magmatism with the Spreading South China Sea

Age and Geochemical Features of Dredged Basalts from Offshore SW Taiwan: The Coincidence of Intra-Plate Magmatism with the Spreading South China Sea

Deep seismic structure of the northeastern South China Sea: Origin of a high‐velocity layer in the lower crust

Multiple sources for volcanic rocks dredged from the Western Australian rifted margin

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