Geochemical constraints on the spatial distribution of recycled oceanic crust in the mantle source of late Cenozoic basalts, Vietnam

Hoang, T.H.; Choi, Sung Hi; Yu, Yongjae; Hiếu, Phạm Trung; Nguyen, Kim Phi Phung; Ryu, Jong-Sik

doi:10.1016/j.lithos.2017.11.020

Cited by 56 publications

(60 citation statements)

References 87 publications

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“…The Al 2 O 3 and CaO contents decreased with decreasing Mg#Cpx at Mg#Cpx < 80, suggesting that plagioclase fractionation may began at Mg#Cpx = 80, because the crystallization of plagioclase would lower the Al 2 O 3 and CaO contents of the melt dramatically [18]. Thus, this study, combined with previous studies [26,43], showed that the order of mineral crystallization of the late Cenozoic basalts of Thailand is as follows, olivine, clinopyroxene, plagioclase. Mg#Cpx < 80, suggesting that plagioclase fractionation may began at Mg#Cpx = 80, because the crystallization of plagioclase would lower the Al2O3 and CaO contents of the melt dramatically [18].…”

Section: Clinopyroxene Major Element Compositionsupporting

confidence: 65%

“…(1) These basaltic rocks had high Fe/Mn ratios (>60) that fall within the pyroxenite-derived melt field (Figure 9a), which is similar to the case for contemporaneous basaltic rocks from Southern Vietnam [25,43]. (2) The majority of these basaltic rocks had high FC3MS values (>0.5), which are plotted within the pyroxenite-derived melt field in the FC3MS-MgO diagram (Figure 9b), which is consistent with those contemporaneous basaltic rocks from Southern Vietnam and Hawaiian basalts [37,43]. (3) These basaltic rocks had low CaO contents, which are plotted within the pyroxenite-derived melt field in the CaO-MgO diagram (Figure 9c), which is similar to contemporaneous basaltic rocks from Southern Vietnam [43], and the olivine phenocrysts inherited this low-CaO signature.…”

Section: Nature Of the Source Lithologysupporting

confidence: 65%

“…Mg#Cpx < 80, suggesting that plagioclase fractionation may began at Mg#Cpx = 80, because the crystallization of plagioclase would lower the Al2O3 and CaO contents of the melt dramatically [18]. Thus, this study, combined with previous studies [26,43], showed that the order of mineral crystallization of the late Cenozoic basalts of Thailand is as follows, olivine, clinopyroxene, plagioclase.…”

Section: Clinopyroxene Major Element Compositionsupporting

confidence: 60%

“…Previous studies have proposed different rock types as pre-melting mantle source rocks, e.g., garnet pyroxenite, garnet peridotite, and recycled upper oceanic crust-derived eclogite/pyroxenite [18,25,26,43,46,47]. In recent decades, researchers have successfully used the Fe/Mn ratio, FC3MS parameter (FeO T /CaO − 3 × MgO/SiO 2 ), CaO content, Dy/Yb ratio, and Yb content to indicate the nature of the source lithology [18,25,26,43,[46][47][48]. Based on these experimental parameters [43,46,47], we used the whole-rock major element compositions [26] to deduce the nature of the source lithology of the Thailand late Cenozoic basaltic rocks ( Table 1).…”

Section: Nature Of the Source Lithologymentioning

confidence: 99%

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In Situ LA-ICP-MS Analysis of Minerals Hosted by Late Cenozoic Basaltic Rocks from Thailand

et al. 2019

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Shortly after the cessation of seafloor spreading, intraplate magmatism affected large areas in the South China Sea (SCS) region. The origin and geodynamic setting of the post-spreading volcanism is still in debate, for many previous studies have focused on petrogenesis and mantle source of the late Cenozoic basalts from the SCS region. In this study, we obtained in situ major element compositions (by using Electron microprobe analysis—EMPA) and trace element compositions (by using laser ablation inductively coupled plasma mass spectrometry— LA-ICP-MS) for minerals (clinopyroxenes (Cpx), plagioclases (Pl), and olivines (Ol)) hosted by late Cenozoic basaltic rocks from Thailand. The results showed that the olivines had forsterite contents between 60.12% and 84.74%. Clinopyroxene were diopside and augite, and they were enriched in light rare earth elements (LREEs) (LaN/YbN = 1.93–4.27) and depleted in large-ion lithophile elements (LILEs). Mineral compositions (mainly based on clinopyroxene) confirmed that these late Cenozoic basaltic rocks were of an intraplate affinity and were similar to contemporaneous basaltic fields in the SCS region (Southern Vietnam, Northern Hainan, and SCS seamounts). Plagioclases were predominantly labradorite, with a few andesine and bytownite, and they were enriched in LREEs and Ba, Sr, and Pb, and most of them exhibited strong positive Eu anomalies. The source lithology of Thailand basaltic rocks could be garnet pyroxenite. The mantle potential temperature beneath Thailand is in the range of 1448–1467 °C, which can be comparable to those beneath Southern Vietnam and Northern Hainan, indicating the Thailand basaltic rocks could be produced by the Hainan mantle plume. In addition, the crystallization temperature of clinopyroxenes (1145–1214 °C) and plagioclase (1067–1133 °C) and their composition characteristics indicate that the magmatic processes have a conspicuous characteristic of fast rate of magma upwelling. Thus, we proposed that the deep geodynamic setting of Thailand late Cenozoic basaltic rocks is similar to those of the whole SCS region, and Hainan mantle plume plays a significant role in the petrogenesis of these basaltic rocks.

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Section: Clinopyroxene Major Element Compositionsupporting

confidence: 65%

Section: Nature Of the Source Lithologysupporting

confidence: 65%

Section: Clinopyroxene Major Element Compositionsupporting

confidence: 60%

Section: Nature Of the Source Lithologymentioning

confidence: 99%

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In Situ LA-ICP-MS Analysis of Minerals Hosted by Late Cenozoic Basaltic Rocks from Thailand

et al. 2019

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“…Short lines with end‐bars in (a) and (d) are ±1σ Ni and Fe/Mn variations of the primary magmas from which olivines crystallize. Data of olivine for global MORBs (Indian ridge, Mid‐Atlantic Ridge, and East Pacific Rise) and Hawaiian OIBs are from Sobolev et al (); data of olivines for Hainan OIBs are from Liu et al () and for Indochina OIBs are from Hoang et al (; note that data of olivines for Hainan and Indochina with Fo < 70 and Fe/Mn > 90 are not used in the plots).…”

Section: Resultsmentioning

confidence: 99%

Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea

Zhang

Sun

Seward

2018

Geochem Geophys Geosyst

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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 ~20 wt.% 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.

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Geochemical Diversity in the Mantle

Hanyu

Chen

2021

Mantle Convection and Surface Expressions

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Geochemical constraints on the spatial distribution of recycled oceanic crust in the mantle source of late Cenozoic basalts, Vietnam

Cited by 56 publications

References 87 publications

In Situ LA-ICP-MS Analysis of Minerals Hosted by Late Cenozoic Basaltic Rocks from Thailand

In Situ LA-ICP-MS Analysis of Minerals Hosted by Late Cenozoic Basaltic Rocks from Thailand

Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea

Geochemical Diversity in the Mantle

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