Nd and Sr isotopes and K-Ar ages of the Ulreungdo alkali volcanic rocks in the East Sea, South Korea.

Kim, Kyu Han; Tanaka, Tsuyoshi; Nagao, Keisuke; Jang, Soyoung

doi:10.2343/geochemj.33.317

Cited by 50 publications

(45 citation statements)

References 46 publications

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“…The volcanic island consists mainly of Cenozoic alkali basaltic lava flows, pyroclastics and marine fossiliferous sedimentary formations known as Seoguipo and Shinyangri Formations. Geological, geochemical and Nd-Sr isotopical characteristics of these volcanic rocks have been reported in detail by previous researchers (Lee, 1982(Lee, , 1989Park and Kwon, 1993;Lee et al, 1994;Park et al, 1996;Kim et al, 1999).…”

Section: Ch-1 Ch-2 and C-1200 Indicate Sample Numberssupporting

confidence: 55%

“…Cenozoic alkali rock province (Lee, 1982;Kim et al, 1999). The volcanic island consists mainly of Cenozoic alkali basaltic lava flows, pyroclastics and marine fossiliferous sedimentary formations known as Seoguipo and Shinyangri Formations.…”

Section: Ch-1 Ch-2 and C-1200 Indicate Sample Numbersmentioning

confidence: 99%

“…Zircon, monazite and allanite minerals in granitic rocks have their high blocking temperatures Granite from the Deokcheon (Manjang tunnel) area whole rock 66.4 ± 1.7 Lee (1996) Yoon et al, 1995a;KIGAM, 1995;Kim et al, 1999).…”

Section: Chime Agementioning

confidence: 99%

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Evidences of the presence of old continental basement in Cheju volcanic Island, South Korea, revealed by radiometric ages and Nd-Sr isotopes of granitic rocks.

et al. 2002

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Major and trace element and Nd-Sr isotopic data are presented on the granitic rocks known as a basement in the Cheju volcanic island, together with CHIME age data on porphyritic hornblende-biotite granite xenolith from the Byeoldobong area.The CHIME ages from zircon and allanite grains of porphyritic hornblende-biotite granite were determined to be 169 ± 29 Ma and 183 ± 40 Ma, respectively, which are corresponding to a Jurassic age. It is concordant with a K-Ar age of 172.4 ± 5

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Section: Ch-1 Ch-2 and C-1200 Indicate Sample Numberssupporting

confidence: 55%

Section: Ch-1 Ch-2 and C-1200 Indicate Sample Numbersmentioning

confidence: 99%

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Evidences of the presence of old continental basement in Cheju volcanic Island, South Korea, revealed by radiometric ages and Nd-Sr isotopes of granitic rocks.

et al. 2002

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“…Ultramafic xenoliths occurred not only in the Chejudo, Baegryeongdo, Jogokri (Boen) and Baegdusan, but Long Quan of Chinese territory as well. Host alkali basalts in the Korean peninsula show OIB geochemical signatures, particularly in REE abundances (Kim et al, 1999). Eruptive ages for the host alkali basalts containing the ultramafic xenoliths range from 21 to 0.1 Ma (Kim et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…However, it is Shaded areas show the main oceanic mantle reservoirs of Zindler and Hart (1986). Data from Kim et al (1999); Choi et al (2002; Kim et al (2005); Kil (2006Kil ( , 2007. …”

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confidence: 99%

Oxygen Isotopic Ratios for Ultramafic Xenoliths from the Korean Peninsula

Lee¹,

Kim²,

Lee³

et al. 2013

Journal of the Korean earth science society

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Full‐waveform inversion of the Japanese Islands region

et al. 2016

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We present a full‐waveform tomographic model of the crust and upper mantle beneath the Japanese Islands region. This is based on the combination of GPU‐accelerated spectral‐element wavefield simulations, adjoint techniques, and nonlinear optimization. Our model explains complete seismic waveforms of events not used in the inversion in the period range from 20 to 80 s. Quantitative resolution analysis indicates that resolution lengths within the well‐covered areas are around 150 km in the horizontal and around 30 km in the vertical directions. In addition to the high‐velocity signatures of known lithospheric slabs in the region, our model reveals a pronounced low‐velocity anomaly beneath the volcanic island of Ulleung in the Sea of Japan, reaching −19% around 100 km depth. The Ulleung anomaly originates at or above the Pacific slab, rises vertically upward to the base of the Philippine Sea slab at ∼200 km depth, circumvents it in NW direction, and then significantly strengthens in the uppermost mantle above the Philippine Sea slab. Among the numerous hypotheses for the generation of low‐velocity anomalies in subduction systems, those invoking instabilities before or when a slab enters the transition zone seem most likely. The age and fast subduction of the Pacific slab may facilitate the transport of fluids into the transition zone. This may promote the reduction in viscosity and the onset of convective upwelling, aided by ambient mantle flow, such as return flow within the mantle wedge.

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Nd and Sr isotopes and K-Ar ages of the Ulreungdo alkali volcanic rocks in the East Sea, South Korea.

Cited by 50 publications

References 46 publications

Evidences of the presence of old continental basement in Cheju volcanic Island, South Korea, revealed by radiometric ages and Nd-Sr isotopes of granitic rocks.

Evidences of the presence of old continental basement in Cheju volcanic Island, South Korea, revealed by radiometric ages and Nd-Sr isotopes of granitic rocks.

Oxygen Isotopic Ratios for Ultramafic Xenoliths from the Korean Peninsula

Full‐waveform inversion of the Japanese Islands region

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