Development of a fully automated open-column chemical-separation system&amp;mdash;COLUMNSPIDER&amp;mdash;and its application to Sr-Nd-Pb isotope analyses of igneous rock samples

Miyazaki, Takashi; Vaglarov, Bogdan Stefanov; Takei, M; Suzuki, Masahiro; Suzuki, Hiroaki; Ohsawa, Kouzou; Chang, Qing; Takahashi, Takehiro; Hirahara, Yuka; Hanyu, Takeshi; Kimura, Jun–Ichi; Tatsumi, Yoshiyuki

doi:10.2465/jmps.110520

Cited by 21 publications

(20 citation statements)

References 53 publications

(61 reference statements)

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“…The analytical results for the groundmass of the SH35 sample showed excellent agreement with the bulk-rock composition analysed by solution MC-ICP-MS (Miyazaki et al, 2012) (Fig. 5B).…”

Section: Silicate Mineralssupporting

confidence: 64%

“…For comparison with bulk-rock Pb isotope compositions, basalt lava samples from Pitcairn Island (PC samples) were analysed by solution MC-ICP-MS using an Aridus desolvating nebulizer and a Neptune MC-ICP-MS (Thermo Fisher, Bremen, Germany) with normal samples, and skimmer cones after the Pb separation procedure (Miyazaki et al, 2012).…”

Section: Mc-icp-msmentioning

confidence: 99%

“…So far, only the JA-1 standard could be used for accessing analytical accuracy of LA-MC-ICP-MS. We need to perform further tests on analytical precision of the Pb isotopes using LA-MC-ICP-MS. To examine the analytical reproducibility further, the groundmass compositions of lava samples from Pitcairn Island were analysed and compared to the bulk-rock Pb isotopes compositions analysed by solution ICP-MS using a Thermo Scientific Neptune at IFREE/JAMSTEC (Miyazaki et al, 2012). The analytical results are shown in Fig.…”

Section: Groundmass Composition Of Lavasmentioning

confidence: 99%

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Pb isotope analyses of silicate rocks and minerals with Faraday detectors using enhanced-sensitivity laser ablation-multiple collector-inductively coupled plasma mass spectrometry

et al. 2013

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“…The analytical results for the groundmass of the SH35 sample showed excellent agreement with the bulk-rock composition analysed by solution MC-ICP-MS (Miyazaki et al, 2012) (Fig. 5B).…”

Section: Silicate Mineralssupporting

confidence: 64%

Section: Mc-icp-msmentioning

confidence: 99%

Section: Groundmass Composition Of Lavasmentioning

confidence: 99%

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Pb isotope analyses of silicate rocks and minerals with Faraday detectors using enhanced-sensitivity laser ablation-multiple collector-inductively coupled plasma mass spectrometry

et al. 2013

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“…The analytical procedure used for the chemical separation and mass spectrometry for Sr and Nd isotope determinations is outlined in Hirahara et al (2009), and Miyazaki et al (2012. Total procedural blanks for Sr and Nd during the measurement period were less than 177 pg and 5 pg, respectively.…”

Section: Analytical Techniquesmentioning

confidence: 99%

Petrological and geochemical evolution of the Tolbachik volcanic massif, Kamchatka, Russia

Churikova

Gordeychik

Iwamori

et al. 2015

Journal of Volcanology and Geothermal Research

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Data on the geology, petrography, and geochemistry of Middle-Late-Pleistocene rocks from the Tolbachik volcanic massif (Kamchatka, Klyuchevskaya group of volcanoes) are presented and compared with rocks from the neighboring Mount Povorotnaya, Klyuchevskaya group basement, and Holocene-historical Tolbachik monogenetic cones. Two volcanic series of lavas, middle-K and high-K, are found in the Tolbachik massif. The results of our data analysis and computer modeling of crystallization at different P-T-H 2 O-fO 2 conditions allow us to reconstruct the geochemical history of the massif. The Tolbachik volcanic massif started to form earlier than 86 ka based on K-Ar dating. During the formation of the pedestal and the lower parts of the stratovolcanoes, the middle-K melts, depleted relative to NMORB, fractionated in water-rich conditions (about 3% of H 2 O). At the Late Pleistocene-Holocene boundary, a large fissure zone was initiated and the geodynamical regime changed. Upwelling associated with intra-arc rifting generated melting from the same mantle source that produced magmas more enriched in incompatible trace elements and subduction components; these magmas are high-K, not depleted relative to N-MORB melts with island arc signatures and rift-like characteristics. The fissure opening caused degassing during magma ascent, and the high-K melts fractionated at anhydrous conditions. These high-K rocks contributed to the formation of the upper parts of stratovolcanoes. At the beginning of Holocene, the high-K rocks became prevalent and formed cinder cones and associated lava fields along the fissure zone. However, some features, including 1975However, some features, including -1976 Northern Breakthrough, are represented by middle-K high-Mg rocks, suggesting that both middle-K and high-K melts still exist in the Tolbachik system. Our results show that fractional crystallization at different water conditions and a variably depleted upper mantle source are responsible for all observed variations in rocks within the Tolbachik volcanic massif. Sr-Nd isotopes are consistent with 2-4% crustal assimilation during formation of the pedestal and stratovolcanoes, while the young lava fields do not show evidence of crustal assimilation. Major and trace element data coupled with K-Ar dating provide strong evidence that Mount Povorotnaya, located in 8 km northeast of Plosky Tolbachik, is an old block of the Tolbachik massif pedestal and for the moment it is the oldest (306 ka) known object in Klyuchevskaya group of volcanoes.

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“…The analytical procedures for the isotopic ratios included chemical separation and mass spectrometry, following the methods reported previously for Sr, Nd, and Pb isotopes [ Hirahara et al ., ; Miyazaki et al ., ; Takahashi et al ., ]. Isotopic ratios of Sr and Nd were determined by using a thermal ionization mass spectrometer (Triton TI; Thermo Fisher Scientific, Bremen, Germany), with fractionation correction by using 86 Sr/ 88 Sr = 0.1194 and 146 Nd/ 144 Nd = 0.7219, respectively.…”

Section: Samples and Analyticalmentioning

confidence: 99%

Missing western half of the Pacific Plate: Geochemical nature of the Izanagi‐Pacific Ridge interaction with a stationary boundary between the Indian and Pacific mantles

Miyazaki

Kimura

Senda

et al. 2015

Geochem Geophys Geosyst

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The source mantle of the basaltic ocean crust on the western half of the Pacific Plate was examined using Pb-Nd-Hf isotopes. The results showed that the subducted Izanagi-Pacific Ridge (IPR) formed from both Pacific (180-80 Ma) and Indian (80-70 Ma) mantles. The western Pacific Plate becomes younger westward and is thought to have formed from the IPR. The ridge was subducted along the KurileJapan-Nankai-Ryukyu (KJNR) Trench at 60-55 Ma and leading edge of the Pacific Plate is currently stagnated in the mantle transition zone. Conversely, the entire eastern half of the Pacific Plate, formed from isotopically distinct Pacific mantle along the East Pacific Rise and the Juan de Fuca Ridge, largely remains on the seafloor. The subducted IPR is inaccessible; therefore, questions regarding which mantle might be responsible for the formation of the western half of the Pacific Plate remain controversial. Knowing the source of the IPR basalts provides insight into the Indian-Pacific mantle boundary before the Cenozoic. Isotopic compositions of the basalts from borehole cores (165-130 Ma) in the western Pacific show that the surface oceanic crust is of Pacific mantle origin. However, the accreted ocean floor basalts in the accretionary prism along the KJNR Trench have Indian mantle signatures. This indicates the younger western Pacific Plate of IPR origin formed partly from Indian mantle and that the Indian-Pacific mantle boundary has been stationary in the western Pacific at least since the Cretaceous.

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Development of a fully automated open-column chemical-separation system—COLUMNSPIDER—and its application to Sr-Nd-Pb isotope analyses of igneous rock samples

Cited by 21 publications

References 53 publications

Pb isotope analyses of silicate rocks and minerals with Faraday detectors using enhanced-sensitivity laser ablation-multiple collector-inductively coupled plasma mass spectrometry

Pb isotope analyses of silicate rocks and minerals with Faraday detectors using enhanced-sensitivity laser ablation-multiple collector-inductively coupled plasma mass spectrometry

Petrological and geochemical evolution of the Tolbachik volcanic massif, Kamchatka, Russia

Missing western half of the Pacific Plate: Geochemical nature of the Izanagi‐Pacific Ridge interaction with a stationary boundary between the Indian and Pacific mantles

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