Zircon U-Pb and fission-track ages of granitic rocks from the Nojima Fault and its vicinity: A new horizon for the LA-ICP-MS U-Pb dating method

久敏, 伊藤; 明弘, 田村; 知晃, 森下; 章司, 荒井

doi:10.5575/geosoc.116.544

Cited by 10 publications

(5 citation statements)

References 21 publications

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“…We used FCT zircon as a U-Pb reference material because it has been precisely dated by the ID-TIMS U-Pb method22 and our repeated analyses of FCT confirmed its suitability as a U-Pb reference zircon923. To test the validity of the applied method and the reproducibility of the obtained age data, zircons of known age from the Buluk Member Tuff (16.2 ± 0.6 Ma24) were also dated during the analytical session.…”

Section: Methodsmentioning

confidence: 99%

Earth's youngest exposed granite and its tectonic implications: the 10–0.8 Ma Kurobegawa Granite

Ito

Yamada

Tamura

et al. 2013

Sci Rep

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Although the quest for Earth's oldest rock is of great importance, identifying the youngest exposed pluton on Earth is also of interest. A pluton is a body of intrusive igneous rock that crystallized from slowly cooling magma at depths of several kilometers beneath the surface of the Earth. Therefore, the youngest exposed pluton represents the most recent tectonic uplift and highest exhumation. The youngest exposed pluton reported to date is the Takidani Granodiorite (~ 1.4 Ma) in the Hida Mountain Range of central Japan. Using LA-ICP-MS and SHRIMP U-Pb zircon dating methods, this study demonstrates that the Kurobegawa Granite, also situated in the Hida Mountain Range, is as young as ~ 0.8 Ma. In addition, data indicate multiple intrusion episodes in this pluton since 10 Ma with a ~ 2-million-year period of quiescence; hence, a future intrusion event is likely within 1 million years.

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Section: Methodsmentioning

confidence: 99%

Earth's youngest exposed granite and its tectonic implications: the 10–0.8 Ma Kurobegawa Granite

Ito

Yamada

Tamura

et al. 2013

Sci Rep

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“…), and has been proven to be applicable to fission track and U–Pb double‐dating (Ito et al . ; Iwano et al . ; Hasebe et al .…”

Section: Towards a Geochronometer With Combined Use Of Mass Spectrometrymentioning

confidence: 99%

A review of the present state of the absolute calibration for zircon fission track geochronometry using the external detector method

Danhara¹,

Iwano²

2013

Island Arc

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The authors have developed and demonstrated an independent calibration of zircon fission track dating with the external detector method. During the past two decades, investigations have continued concerning the issues of the absolute age calibration of fission track dating. The derivation of accurate fission track age equations has been made possible by taking into account the relationships between the latent and etched track lengths. Our dating exercise involving 10 zircon reference samples supports our claim that absolute age determinations can be carried out based on the following three parameters:(1) the 238 U spontaneous fission decay constant of 8.5 ¥ 10 -17 a -1 (l f ) which is recommended by the IUPAC; (2) thermal neutron fluence values based on pre-irradiated IRMM540 dosimeter glass, which is equivalent to the Au and Co metal activation monitors in the 1990 IUGS recommendation; and (3) a [GQR] correction value of 1.35 which has been experimentally determined for the combination of zircon external surfaces irradiated with mica external detectors. Independent measurements of uranium concentration by the fission track method were also tested. A new method of fission track dating that uses mass spectrometry for uranium measurements was simulated with success using our zircon data. We propose that the Fission Track Community reassesses the situation and formulates a new recommendation, in which the established independent method is placed on at least an equal footing with the standard-based method.

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“…Multiple (or double) dating by the U–Pb and FT methods on the same spot is a significant advantage in obtaining information on the geological history of target samples (Carter & Moss ; Ito et al . ; Iwano et al . ).…”

Section: Introductionmentioning

confidence: 94%

“…rare earth element characteristics) could be used to interpret the obtained ages Gunther et al 1999;Becker et al 2000). Multiple (or double) dating by the U-Pb and FT methods on the same spot is a significant advantage in obtaining information on the geological history of target samples (Carter & Moss 1999;Ito et al 2010;Iwano et al 2012). In this report, the LA-ICP-MS FT dating method is briefly reviewed to mention age equations and statistical treatments of age data.…”

Section: Introductionmentioning

confidence: 99%

Zeta equivalent fission‐track dating using LA‐ICP‐MS and examples with simultaneous U–Pb dating

2013

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The use of laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) in the measurement of uranium concentration for fission-track (FT) dating can provide additional geochronological information by simultaneously acquiring data for U-Pb dating. To circumvent the use of several calibration factors with uncertainties in the FT age equation (i.e. the decay constant, values related to neutron irradiation, and observation efficiencies), the zeta calibration, which is based on the analysis of age-known standard samples, is recommended internationally. In this report, procedures to acquire LA-ICP-MS data for simultaneous dating by FT and U-Pb methods, the age equation with zeta-equivalent calibration, and the statistical treatment of FT age data, are proposed. An excimer laser beam with 20 μm diameter was used for sampling. We empirically determined zeta calibration constants against NIST SRM610 for FT zircon and apatite dating by analyzing several age standards. The data agreed with the calculated values, which can be obtained using reasonable constants in the equation. The correction factor in 238 U-206 Pb age determination with NIST SRM610 as an external standard was defined as 0.920 ± 0.034 by analyzing several standards (FCT, Plešovice, Duluth, GJ-1). Based on this calibration system, zircons from the Nisatai Dacite, Japan, which is a secondary age standard commonly used in the Japanese FT community, were simultaneously dated to be 22 Ma by FT and U-Pb methods on the same grains.

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Zircon U-Pb and fission-track ages of granitic rocks from the Nojima Fault and its vicinity: A new horizon for the LA-ICP-MS U-Pb dating method

Cited by 10 publications

References 21 publications

Earth's youngest exposed granite and its tectonic implications: the 10–0.8 Ma Kurobegawa Granite

Earth's youngest exposed granite and its tectonic implications: the 10–0.8 Ma Kurobegawa Granite

A review of the present state of the absolute calibration for zircon fission track geochronometry using the external detector method

Zeta equivalent fission‐track dating using LA‐ICP‐MS and examples with simultaneous U–Pb dating

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