Sr, Nd isotope geochemistry of volcanic rock series and its geological significance in the middle Okinawa Trough

Meng, Xianwei; Chen, Zhihua; Du, Dewen; Wu, Jinlong

doi:10.1007/bf02875307

Cited by 20 publications

(21 citation statements)

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“…Data for 3-5 of pumice are from Zhai et al (2001). Data for 10-13 of basalt are from Meng et al (2000). Data for 10-13 of basalt are from Meng et al (2000).…”

Section: Resultsmentioning

confidence: 99%

“…Data for 10-13 of basalt are from Meng et al (2000). Data for Sr-Nd isotope compositions of Okinawa Trough basalt (OTB) are from Meng et al (2000), Shinjo and Kato (2000) and Hoang and Uto (2006 (Fig. Data for Sr-Nd isotope compositions of Okinawa Trough basalt (OTB) are from Meng et al (2000), Shinjo and Kato (2000) and Hoang and Uto (2006 (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Compared to the Mariana Trough, Lau Basin and other back-arc basins, the Okinawa Trough is still a back-arc basin undergoing an early spreading stage (Zhai et al, 2001), where volcanic rocks have apparently different Sr-Nd-Pb isotopic composition characteristics. Meng et al (2000) believed that the various types of volcanic rock in the Okinawa Trough are products of eruption after MORB-type magma mixed with crust-derived rhyolitic magma by different ratios. Meng et al (2000) believed that the various types of volcanic rock in the Okinawa Trough are products of eruption after MORB-type magma mixed with crust-derived rhyolitic magma by different ratios.…”

Section: Magma Sourcementioning

confidence: 99%

“…Acid pumice is the most widely distributed volcanic rock in the Okinawa Trough and present in the three segments. Many scholars have conducted extensive research on the petrology, mineralogy and elemental and isotope geochemistry of pumice from the Okinawa Trough (Zhai, 1986(Zhai, , 1987Qin et al, 1987;Qin and Zhai, 1988;Ishizuka et al, 1990;Honma et al, 1991;Chen et al, 1993;Zhai et al, 1994Zhai et al, , 1997Zhai et al, , 2001Meng et al, 2000;Shinjo and Kato, 2000;Huang et al, 2006a, b;Han et al, 2008;Yan and Shi, 2014). Many scholars have conducted extensive research on the petrology, mineralogy and elemental and isotope geochemistry of pumice from the Okinawa Trough (Zhai, 1986(Zhai, , 1987Qin et al, 1987;Qin and Zhai, 1988;Ishizuka et al, 1990;Honma et al, 1991;Chen et al, 1993;Zhai et al, 1994Zhai et al, , 1997Zhai et al, , 2001Meng et al, 2000;Shinjo and Kato, 2000;Huang et al, 2006a, b;Han et al, 2008;Yan and Shi, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Sr–Nd–Pb isotopic geochemistry of phenocrysts in pumice from the central Okinawa Trough

Guo

Zhai

et al. 2016

Geological Journal

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Pumice is the most widely distributed magmatic rock in the Okinawa Trough. Numerous scholars have conducted extensive research on the mineralogy, petrochemistry and whole‐rock isotopic characteristics of pumice. However, even with extensive research, some information about pumice is still unknown, including the initial provenance of magma, influences from subducting plates and the possibility of crustal material (including sediments) mixing in during pumice formation. As pumice is loose and porous, seawater re‐modification and injection of sediments may occur during the condensation and rock‐forming process after magma erupts from the seafloor, or in the seawater immersion process after pumice formation. In order to get a better understanding of the isotopic characteristics of magmatism phase, phenocrysts were first separated from the pumice and divided into both light and heavy minerals to analyse their Sr–Nd–Pb isotopic composition. This information was combined with existing isotopic data of volcanic rocks from the Okinawa Trough and its adjacent areas to assess the magma source composition, influence from subduction components and mantle properties in the magmatic source. The research results indicated light minerals had an average 87Sr/86Sr ratio of 0.70454, while heavy minerals averaged 0.70546. The magma, formed pumice, was a product of the crystal fractionation evolution of basic magma, with the additional injection of crustal material. The magma source in the central trough is a mixture of depleted MORB mantle (DMM) and enriched mantle (EMI‐like and EMII‐like) end members, where the EMI‐like end member is the residual subcontinental lithosphere or lower crustal material and the EMII‐like end member is subducted oceanic sediments. The Pb isotopic composition indicated that the magma source was affected by subduction components (sediments) and that pumice magma was mixed with more sediment than basalt magma material in the same area. The mantle of the magma source in the Okinawa Trough showed signatures of the Indian Ocean‐type mantle. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Data for 3-5 of pumice are from Zhai et al (2001). Data for 10-13 of basalt are from Meng et al (2000). Data for 10-13 of basalt are from Meng et al (2000).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Magma Sourcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sr–Nd–Pb isotopic geochemistry of phenocrysts in pumice from the central Okinawa Trough

Guo

Zhai

et al. 2016

Geological Journal

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“…The key part of (a) has been enlarged in (b). Data of potential provenances including the modern Changjiang sediments (Yang et al, 2007a), the paleo-Huanghe and the modern Huanghe sediments (Hu et al, 2012), the East China Sea shelf sediments (Meng et al, 2001), Taiwan sediments (Chen and Lee, 1990;Lan et al, 1995), Taiwan-dominant deposition in nearby core DGKS9604 formed since 7.1 ka (Dou et al, 2012), eolian dust from the Chinese Loess Plateau and surrounding deserts (Biscaye et al, 1997), volcanic glass in the Okinawa Trough (Meng et al, 2000), and volcanic rocks in southwest Japan (Hosono et al, 2003) are also plotted for comparison. Note the difference between each unit.…”

Section: Paleoenvironmental Significance Of Detrital Sediment Provenamentioning

confidence: 99%

Sr–Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary

Lim

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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High‐potassium volcanic rocks from the Okinawa Trough: Implications for a cryptic potassium‐rich and DUPAL‐like source

Zhang

Zeng

et al. 2017

Geological Journal

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Major element, trace element, and Sr–Nd–Pb isotopic compositions of high‐potassium calc‐alkaline rhyolites (the T6 rhyolites) collected from the western slope of the middle Okinawa Trough (MOT) are reported in this article. These high‐potassium rhyolites have similar major and trace elemental compositions as Type 2 rhyolites from the MOT, except that the former contain higher concentrations of K2O, Th, U, and Rb and lower concentrations of Sr and Eu. Experimental data indicate that the T6 rhyolites cannot be sourced from low‐ to mid‐potassium MOT rocks by either fractional crystallization or partial melting processes but are instead derived from a cryptic potassium‐rich source beneath the Okinawa Trough (OT). Considering that high‐potassium volcanic rocks are distributed throughout the East China Sea Shelf, the Ryukyu Arc, and Kyushu Island, the high‐potassium OT rocks could represent an important connection between the OT and its adjacent regions. Compared to volcanic rocks from the MOT axial zone, the T6 rhyolites have more depleted Sr–Nd isotopic compositions (87Sr/86Sr = 0.7035–0.7036, 143Nd/144Nd = 0.51291–0.51297) but much more enriched compositions of 207Pb (207Pb/204Pb = 15.60–15.63) and 208Pb (208Pb/204Pb = 38.45–38.57), thus recording a significant DUPAL‐like signature. These isotopic anomalies cannot be explained by the incorporation of subducting sediments or crustal contamination but instead imply the presence of a DUPAL‐like mantle source beneath the OT. The decrease of the DUPAL‐like anomaly from the T6 rhyolites to the MOT axial zone volcanic rocks is consistent with the injection of an normal mid‐ocean ridge basalt (N‐MORB) mantle source, such as asthenospheric material, into pre‐existing DUPAL‐like mantle during back‐arc extension.

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Sr, Nd isotope geochemistry of volcanic rock series and its geological significance in the middle Okinawa Trough

Cited by 20 publications

References 3 publications

Sr–Nd–Pb isotopic geochemistry of phenocrysts in pumice from the central Okinawa Trough

Sr–Nd–Pb isotopic geochemistry of phenocrysts in pumice from the central Okinawa Trough

Sr–Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary

High‐potassium volcanic rocks from the Okinawa Trough: Implications for a cryptic potassium‐rich and DUPAL‐like source

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