Výsledky vyhledávání - "Susumu Nohda"

Formation of the Japan Sea basin: Reassessment from Ar–Ar ages and Nd–Sr isotopic data of basement basalts of the Japan Sea and adjacent regions

Autor: Susumu Nohda

Publikováno v: Journal of Asian Earth Sciences. 34:599-609

Many studies have examined the Japan Sea basalts recovered during Ocean Drilling Program (ODP) Leg127/128. Of these, the 40Ar–39Ar dating undertaken is important in constraining the timing of the formation of the Japan Sea; however, the implication

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1a901c5111480539eda76d45025b8c01
https://doi.org/10.1016/j.jseaes.2008.08.003

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The Paleozoic minimum of 87Sr/86Sr ratio in the Capitanian (Permian) mid-oceanic carbonates: A critical turning point in the Late Paleozoic

Autor: Yukio Isozaki, Mamiko Fukui, Susumu Nohda, Tomomi Kani

Publikováno v: Journal of Asian Earth Sciences. 32:22-33

The secular change in 87Sr/86Sr ratio of the Paleozoic recorded the lowest value below 0.7070 in Late Middle Permian, i.e., the Permian minimum, suggesting that a major reform in oceanography occurred before the Paleozoic–Mesozoic transition. We ha

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fca62bf4061811bfdebecbc1a8e5019e
https://doi.org/10.1016/j.jseaes.2007.10.007

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Evidence from the Rb-Sr system for 4.4 Ga alteration of chondrules in the Allende (CV3) parent body

Autor: Noboru Nakamura, Tomomi Kani, Koshi Yamamoto, Makoto Kimura, Gen Shimoda, Susumu Nohda

Publikováno v: Meteoritics & Planetary Science. 40:1059-1072

The timing and processes of alteration in the CV parent body are investigated by the analysis of Sr isotopes, major and trace elements, and petrographic type and distribution of the secondary minerals (nepheline and sodalite) in 22 chondrules from th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::21f5ae30ecf84d40be3fc7bc179de581
https://doi.org/10.1111/j.1945-5100.2005.tb00173.x

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Systematic Variation of Sr-, Nd- and Pb-Isotopes with Time in Lavas of Mauritius, Reunion Hotspot

Autor: Kozo Uto, Takeshi Hanyu, Susumu Nohda, Sheng Xu, Ichiro Kaneoka

Publikováno v: Journal of Petrology. 46:505-522

We report Sr-, Nd- and Pb-isotopic compositions for the lavas of Mauritius, the second youngest volcanic island in the Reunion hotspot. The lavas of the Older Series (7·8–5·5 Ma) have identical isotopic compositions (87Sr/86Sr = 0·70411 to 0·70

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::adf267e7baf752d78764ea37b40ca4c6
https://doi.org/10.1093/petrology/egh085

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Geochemistry of the oldest MORB and OIB in the Isua Supracrustal Belt, southern West Greenland: Implications for the composition and temperature of early Archean upper mantle

Autor: Susumu Nohda, Tsuyoshi Komiya, Shigenori Maruyama, Hisayoshi Yurimoto, Takafumi Hirata

Publikováno v: The Island Arc. 13:47-72

Recent geological investigations of the Isua Supracrustal Belt (3.8 Ga), southern West Greenland, have suggested that it is the oldest accretionary complex on earth, defined by an oceanic plate-type stratigraphy and a duplex structure. Plate history

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d25591476abd4fcb5d42fef88b50c903
https://doi.org/10.1111/j.1440-1738.2003.00416.x

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Pb Isotope Analyses Using Bead Method: Application to BCR-1 and GSJ Standard Rock Samples

Autor: Susumu Nohda, Tomomi Kani

Publikováno v: Journal of the Mass Spectrometry Society of Japan. 50:199-203

It has been established that a new filament loading scheme for lead isotopic analysis using thermal ionization mass spectrometry, so called “bead method,” which gives stable ion beam and high reproducibility. Two minor modifications to this schem

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f5795202972040b85e7f7623e5164d0a
https://doi.org/10.5702/massspec.50.199

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Noble gas study of the Reunion hotspot: evidence for distinct less-degassed mantle sources

Autor: Susumu Nohda, Ichiro Kaneoka, Takeshi Hanyu, Kozo Uto, Tibor J. Dunai, Gareth Davies

Publikováno v: Earth and Planetary Science Letters. 193:83-98

We present an extensive He, Ne and Ar isotope data set from the Reunion hotspot that demonstrates the presence of a homogeneous plume source that has unique isotopic characteristics. 3He/4He ratios of the two volcanoes on Reunion (Piton de la Fournai

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fa6181cd73c5b609e9f486b6a3773b9a
https://doi.org/10.1016/s0012-821x(01)00489-7

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Precise isotopic measurements of lead by fused silicagel

Autor: Susumu Nohda

Publikováno v: GEOCHEMICAL JOURNAL. 33:133-139

Samples for lead isotope measurements are generally loaded with silica-gel as the activator, and phosphoric acid. Then, the silica-gel, sample mixture is fused into glass on the filament by passing a high current for a short instant before mass-spect

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2793b9ad7e5647f0936ab606813cbc8d
https://doi.org/10.2343/geochemj.33.133

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