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

Ito, Hisatoshi; Yamada, Ryūji; Tamura, Akihiro; Arai, Shoji; Horie, Kenji; Hokada, Tomokazu

doi:10.1038/srep01306

Cited by 41 publications

(42 citation statements)

References 30 publications

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“…In the Takidani region in the southern part of the Hida Range, the denudation rates range 5.1–5.9 mm/yr since ~1.9–1.5 Ma [ Bando et al ., ], where Quaternary granitoids are exposed at the surface [ Harayama , ] and their formation depths from Al‐in‐hornblende geobarometry have been estimated at 6.3–9.4 km [ Bando et al ., ]. Comparable rapid denudation rates are expected in the Kurobe region in the northern Hida Range because substantial granitoids formed at 10–0.8 Ma are exposed [ Ito et al ., ]. Considering the young AFT ages obtained by Yamagiwa [MS] (Figure b), the southern Akaishi Range is also expected to be denuded at a few mm/yr or a higher rate.…”

Section: Discussionmentioning

confidence: 99%

Uplift and denudation history of the Akaishi Range, a thrust block formed by arc‐arc collision in central Japan: Insights from low‐temperature thermochronometry and thermokinematic modeling

et al. 2017

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Fission track (FT), (U‐Th)/He (He), and U‐Pb data were used to identify the denudation history of the Akaishi Range, central Japan. The northern Akaishi Range is bounded on the east by the Itoigawa‐Shizuoka Tectonic Line Fault Zone (ISTL‐FZ). The thermochronometric ages progressively decrease with the decreasing distance to the ISTL‐FZ. Thermokinematic calculations suggest that the age pattern observed can be explained by 5–7.5 mm/yr reverse slip on the ISTL‐FZ that dips 34–45° west and soles onto detachment at 20–22.5 km depth. By assuming the same geometry and slip rate of the fault, the bedrock uplift rates and denudation rates are estimated at ~4 mm/yr. Thus, the uplift and denudation style of the northern Akaishi Range is well explained as a simple tilted thrust block that has been exhumed along the listric ISTL‐FZ. On the other hand, considering both the difference in apatite FT age and the active fault distribution, the southern Akaishi Range might be different in uplift origin and timing, although the difference in apatite FT ages between them may be attributable to the chlorine content variation in apatite. The inferred total denudation is larger than several kilometers and likely exceeds 10 km since the beginning of the northern Akaishi Range uplift, suggesting that the low‐relief surfaces on the ridges and the relatively constant elevations of the summits reflect postuplift denudation rather than preexisting low‐relief landforms.

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Section: Discussionmentioning

confidence: 99%

Uplift and denudation history of the Akaishi Range, a thrust block formed by arc‐arc collision in central Japan: Insights from low‐temperature thermochronometry and thermokinematic modeling

et al. 2017

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“…This is because LA‐ICP‐MS is capable of dating several hundred <1 Ma old zircon crystals in a day (e.g. Bachmann, Charlier, & Lowenstern, ; Cocherie, Fanning, Jezequel, & Robert, ; Guillong, Quadt, Sakata, Peytcheva, & Bachmann, ; Ito, , ; Ito, Nanayama, & Nakazato, ; Ito, Spencer, Danišík, & Hoiland, ; Ito, Tamura, et al, ; Ito, Uesawa, Nanayama, & Nakagawa, ; Ito, Yamada, et al, ; Sakata et al, ) and consumes a reasonably small volume of material (<40 μm wide and <30 μm deep ablation pits), enabling the subsequent (U‐Th)/He analysis of ablated crystals.…”

Section: Introductionmentioning

confidence: 99%

Dating late Quaternary events by the combined U‐Pb LA‐ICP‐MS and (U‐Th)/He dating of zircon: A case study on Omachi Tephra suite (central Japan)

Ito

Danišík

2020

Terra Nova

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Dating of young (<1 Ma) geological events has long been a challenge for geochronologists. Combining (U‐Th)/He with U‐Pb or U‐Th‐disequilibrium dating methods offers a unique dating tool that can address this important period. We present a new methodology that combines U‐Pb LA‐ICP‐MS and (U‐Th)/He dating of zircon and use it to date two Pleistocene marker tephras (A1Pm and DPm) from the Omachi Tephra suite (Japan). A1Pm and DPm yield U‐Pb ages in the range of 350–850 and ~140–630 ka, respectively, documenting protracted periods of zircon crystallisation (100's of k.y.) prior to eruption. (U‐Th)/He ages constrain the eruption ages of the A1Pm and DPm tephras to 375 ± 13 and 97.1 ± 7.3 ka, respectively, and are in agreement with published estimates. This study demonstrates the potential of combined zircon U‐Pb LA‐ICP‐MS and (U‐Th)/He dating to constrain magmatic and eruption events in the critical ~100 ka–1 Ma interval.

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“…(a) Simplified map of the Hida Mountain Range (HMR; afterIto et al, 2017). (c) Simplified geologic map of the HMR (afterIto et al, 2013). (b) Topographic map of the sampling region of the HMR with sample locations and geochronological and thermochronological data from this study.…”

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Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic Arc

Spencer

Danišík

Ito

et al. 2019

Geophysical Research Letters

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Exhumation of plutonic systems is driven by a range of mechanisms including isostatic, tectonic, and erosional processes. Variable rates of plutonic exhumation in active subduction systems may be driven by idiosyncrasies of regional geology or by first‐order tectonic features. We report new age, isotope, and low‐temperature thermochronology constraints of granitoids from the Hida Mountains of central Japan that constrain the highest rates and magnitude of plutonic rock exhumation within the Japan and one of the highest worldwide. This extreme exhumation is centered on the apex of a lithospheric scale anticlinorium associated with the subduction of the Izu‐Bonin oceanic arc. The spatial and temporal relationship between the exhumation of these Pleistocene plutons and the subducting/accreting Izu‐Bonin oceanic arc links the plate‐scale geodynamics and regional exhumation patterns. Identifying thermochronological anomalies within magmatic arcs provides an opportunity to identify ancient asperities previously subducted and responsible for rapid exhumation rates within ancient subduction systems.

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

Cited by 41 publications

References 30 publications

Uplift and denudation history of the Akaishi Range, a thrust block formed by arc‐arc collision in central Japan: Insights from low‐temperature thermochronometry and thermokinematic modeling

Uplift and denudation history of the Akaishi Range, a thrust block formed by arc‐arc collision in central Japan: Insights from low‐temperature thermochronometry and thermokinematic modeling

Dating late Quaternary events by the combined U‐Pb LA‐ICP‐MS and (U‐Th)/He dating of zircon: A case study on Omachi Tephra suite (central Japan)

Rapid Exhumation of Earth's Youngest Exposed Granites Driven by Subduction of an Oceanic Arc

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