Chronology of the 1400-m core obtained from Lake Biwa in 1982-1983 : Re-investigation of fission-track ages and tephra identification

徹, 檀原; 透, 山下; 英樹, 岩野; 恵二, 竹村; 明, 林田

doi:10.4116/jaqua.49.101

Cited by 17 publications

(10 citation statements)

References 51 publications

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“…An absolute calibration approach for FT dating is commonly avoided because various values of up to 20% difference have been reported for l f in previous studies. Danhara et al (2010) provided a summary and discussion of the analytical issues and deemed the use of l f = 8.5 ¥ 10 -17 /year as acceptable. We adopted a value of l f = 8.46 ¥ 10 -17 /year for absolute FT age calculations.…”

Section: Fission-track Analysismentioning

confidence: 99%

Denudation history of the Kiso Range, central Japan, and its tectonic implications: Constraints from low‐temperature thermochronology

et al. 2012

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Fission-track (FT) and (U-Th-Sm)/He (He) analyses are used to constrain the denudation pattern and history of the Kiso Range, a Japanese fault-block mountain range which has been uplifted since ca 0.8 Ma. We obtained nine zircon FT ages ranging 59.3-42.1 Ma, 18 apatite FT ages ranging 81.9-2.3 Ma, and 13 apatite He ages ranging 36.7-2.2 Ma. The apatite FT and He ages are divided into an older group comparable to the zircon FT age range and a younger group of <18 Ma. The younger ages are interpreted as a reflection of uplift of the Kiso Range because they were obtained only to the east of the Seinaiji-touge Fault, and the event age estimated from apatite FT data is consistent with the timing of the onset of the Kiso Range uplift. On the basis of the distribution of the younger ages, we propose westward tilting uplift of the Kiso Range between the boundary fault of the Inadani Fault Zone and Seinaiji-touge Fault, which implies a model of bedrock uplift that is intermediate between two existing models: a pop-up model in which the Kiso Range is squeezed upward between the two faults and a tilted uplift model which assumes that the Kiso Range is uplifted and tilted to the west by the Inadani Fault Zone. The original land surface before the onset of uplift/denudation of the Kiso Range is estimated to have been uplifted to an elevation of 2700-4900 m. We estimated denudation rates at 1.3-4.0 mm/y and maximum bedrock uplift rates at 3.4-6.1 mm/y since ca 0.8 Ma. The Seinaiji-touge fault is interpreted as a back thrust of the west-dipping Inadani Fault Zone. The older group of apatite FT and He ages is interpreted to reflect long-term peneplanation with a probable denudation rate of <0.1 mm/y.

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Section: Fission-track Analysismentioning

confidence: 99%

Denudation history of the Kiso Range, central Japan, and its tectonic implications: Constraints from low‐temperature thermochronology

et al. 2012

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“…This tephra was first identified and described in marine sediments (Arai et al 1981) and then correlated with the U-2 tephra on Ulleung Island itself (Machida et al 1984). The majority of deglacial-age Ulleung tephras in the Japan Sea have since been correlated with the U-Oki tephra bed, largely on the basis of their petrographic characteristics (e.g., Machida et al 1984;Yoshikawa and Inouchi 1993;Takata et al 2006;Danhara et al 2010). Recently, however, Shiihara et al (2011Shiihara et al ( , 2013 analyzed the major geochemistry of the glass shards and identified two types of Ulleung tephra in the deglacial sediments from the Japan Sea.…”

Section: Tephra As a Stratigraphic Toolmentioning

confidence: 99%

Marine tephra in the Japan Sea sediments as a tool for paleoceanography and paleoclimatology

Ikehara

2015

Prog. in Earth and Planet. Sci.

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Tephra is a product of large and explosive volcanic events and can travel thousands of kilometers before deposition. Consequently, tephra deposits are common in terrestrial, lacustrine, marine, and glacial environments. Because tephra deposition is a geologically synchronous event, tephras constitute important isochrones in the Quaternary sequence, not only in Japan but also throughout the northwest Pacific and its marginal seas. As a result, establishing the chronostratigraphic order of tephra deposits is an effective tool for assessing local and regional stratigraphies and for correlating events among sites. For example, tephrostratigraphy can provide precise chronological constraints for other stratigraphic data, such as magneto-and biostratigraphic data. Spatiotemporal variability in the occurrence and geochemistry of tephras can also be used to trace the magmatic evolution of island arcs and their relationships to regional tectonics. In a paleoclimatic context, tephra deposits allow the correlation of past climate events among terrestrial, lacustrine, and marine environments. Tephrochronology is also a fundamental element used in reconstructing the marine reservoir effect, where the ages of tephra in marine and terrestrial settings are compared. Therefore, tephra is a valuable tool not only in stratigraphy, chronology, and volcanology but also in paleoceanography and paleoclimatology.

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“…The present authors have made significant contributions towards re-establishing an independent fission track age calibration for apatite and other minerals, focusing on the track counting efficiencies and the spontaneous fission decay constant (Iwano et al 1992(Iwano et al , 2000Iwano & Danhara 1998;Danhara et al 1999Danhara et al , 2010Yoshioka et al , 2006. In this article, the present state of independent fission track age and uranium concentration measurements for zircon are reviewed.…”

Section: Introductionmentioning

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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Chronology of the 1400-m core obtained from Lake Biwa in 1982-1983 : Re-investigation of fission-track ages and tephra identification

Cited by 17 publications

References 51 publications

Denudation history of the Kiso Range, central Japan, and its tectonic implications: Constraints from low‐temperature thermochronology

Denudation history of the Kiso Range, central Japan, and its tectonic implications: Constraints from low‐temperature thermochronology

Marine tephra in the Japan Sea sediments as a tool for paleoceanography and paleoclimatology

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

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