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Journal Articles

Simultaneous determination of zircon crystallisation age and temperature; Common thermal evolution of mafic magmatic enclaves and host granites in the Kurobegawa granite, central Japan

Yuguchi, Takashi*; Yamazaki, Hayato*; Ishibashi, Kozue*; Sakata, Shuhei*; Yokoyama, Tatsunori; Suzuki, Satoshi*; Ogita, Yasuhiro; Sando, Kazusa*; Imura, Takumi*; Ono, Takeshi*

Journal of Asian Earth Sciences, 226, p.105075_1 - 105075_9, 2022/04

 Times Cited Count:3 Percentile:52.46(Geosciences, Multidisciplinary)

Simultaneous determination of the U-Pb age of zircon and concentration of titanium in a single analysis spot, using inductively coupled plasma mass spectrometry with laser ablation sample introduction, produces paired age and temperature data of zircon crystallisation, potentially revealing time-temperature ($$t-T$$) histories for evolved magma. The Kurobegawa granite, central Japan, contains abundant mafic magmatic enclaves (MMEs). We applied this method to evaluate MMEs and their host (enclosing) granites. Cooling behaviour common to both MMEs and host rocks was found between 1.5 and 0.5 Ma. Rapid cooling from the zircon crystallisation temperature to the closure temperature of biotite K-Ar system was within $$sim$$1 million year. Combining the obtained $$t-T$$ paths of MMEs and host rocks with petrological information can provide insights into magma chamber processes. This suggests that MME flotation, migration, and spread through the magma chamber ceased at 1.5-0.5 Ma, indicating the emplacement age of the Kurobegawa granitic pluton, as no large-scale reheating episodes have occurred since then.

Journal Articles

Simultaneous determination of zircon U-Pb age and titanium concentration using LA-ICP-MS for crystallization age and temperature

Yuguchi, Takashi*; Ishibashi, Kozue*; Sakata, Shuhei*; Yokoyama, Tatsunori; Ito, Daichi*; Ogita, Yasuhiro; Yagi, Koshi*; Ono, Takeshi*

Lithos, 372-373, p.105682_1 - 105682_9, 2020/11

 Times Cited Count:2 Percentile:14.63(Geochemistry & Geophysics)

Simultaneous determination of zircon U-Pb age and titanium concentration for a single analysis spot gives both the crystallization age and temperature. The crystallization age and temperature pairs in granitic zircons map the time-temperature ($$t-T$$) path of granitic magma before its solidification. In laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis, it is challenging to quantitatively analyse a low level of titanium concentration. This study employed two approaches using a Quadrupole mass spectrometer equipped with a collision/reaction cell (CRC). The methods were applied to zircon samples of the Kurobegawa granite (KRG), the Okueyama granite (OKG), the Toki granite (TKG), and the Tono plutonic complex (TPC) and provided U-Pb ages and titanium concentrations consistent with previous studies. The crystallization ages and temperatures collected from individual analysis spots of zircon samples in the KRG, OKG, TKG, and TPC are plotted in the $$t-T$$ diagrams and enable us to characterize the rapid cooling paths at thermal conditions of zircon crystallization at the sampling sites.

Journal Articles

High-precision quadrupole moment reveals significant intruder component in $$^{33}_{13}$$Al$$_{20}$$ ground state

Heylen, H.*; De Rydt, M.*; Neyens, G.*; Bissell, M. L.*; Caceres, L.*; Chevrier, R.*; Daugas, J. M.*; Ichikawa, Yuichi*; Ishibashi, Yoko*; Kamalou, O.*; et al.

Physical Review C, 94(3), p.034312_1 - 034312_5, 2016/09

AA2016-0115.pdf:0.4MB

 Times Cited Count:36 Percentile:91.95(Physics, Nuclear)

no abstracts in English

Journal Articles

Spins and parities of astrophysically important $$^{30}$$S states from $$^{28}$$Si($$^{3}$$He, $$n$$$$gamma$$)$$^{30}$$S

Setoodehnia, K.*; Chen, A. A.*; Komatsubara, Tetsuro*; Kubono, Shigeru*; Binh, D. N.*; Carpino, J. F.*; Chen, J.*; Hashimoto, Takashi*; Hayakawa, Takehito; Ishibashi, Yoko*; et al.

Physical Review C, 83(1), p.018803_1 - 018803_4, 2011/01

 Times Cited Count:12 Percentile:60.85(Physics, Nuclear)

The structure of proton-unbound $$^{30}$$S states strongly determines the thermonuclear $$^{29}$$P($$p$$, $$gamma$$)$$^{30}$$S reaction rate at temperatures characteristic of explosive hydrogen burning in classical novae and type I X-ray bursts. Specifically, the rate had been previously predicted to be dominated by two low-lying, unobserved, levels in the $$E$$$$_{x}$$=4.7-4.8 MeV region, with spin and parity assignments of 3$$^{+}$$ and 2$$^{+}$$. In recent experimental work, two candidate levels were observed with energies of 4.699 MeV and 4.814 MeV, but no experimental information on their spins and parities was obtained. We have performed an in-beam $$gamma$$-ray spectroscopy study of $$^{30}$$S with the $$^{28}$$Si($$^{3}$$He, $$n$$$$gamma$$)$$^{30}$$S reaction. The spin and parities were inferred from a comparison to the known decay schemes of the corresponding mirror states.

Oral presentation

Basic comparison of the numerical method to solve fluid equations for SOL/divertor plasma

Tatsumi, Ryoko*; Homma, Yuki; Yamoto, Shohei*; Takahara, Keisuke*; Ishibashi, Kazuhiro*; Hatayama, Akiyoshi*

no journal, , 

no abstracts in English

Oral presentation

An Analytical technique for simultaneously estimating crystallization age and temperature of zircon using LA-ICP-MS

Yokoyama, Tatsunori; Yuguchi, Takashi*; Sakata, Shuhei*; Ishibashi, Kozue*; Ogita, Yasuhiro*; Ito, Daichi*; Ono, Takeshi*; Kagami, Saya; Mitsuguchi, Takehiro; Sueoka, Shigeru

no journal, , 

Dating and trace elements analysis of zircons provide us the evidences of past thermal history about their growth events, such as timing and temperature of magmatism and crystallization. In granitic rocks, because the proposed closure temperature of zircon U-Pb ($$>$$900 $$^{circ}$$C) is often higher than crystallization temperature of the zircon, the zircon U-Pb age means the timing of crystallization. To clarify the growth history of granitic pluton, Yuguchi et al. (2016) performed the observation of internal structure of zircon (collected from the Toki granite, central Japan) using cathodoluminescence, deriving crystallization temperature and age using Ti-in-zircon thermometry and U-Pb dating. It is important to discuss the emplacement by such an approach to understand the history of upheaval and exhumation of igneous complex. In this study, for simultaneously estimating crystallization age and temperature of zircon, we performed U-Pb isotopic analysis and quantitative analysis of Titanium, in the same position of zircon, using LA-ICP-MS after the cathodoluminescence observation. As preliminary experiments, we analyzed zircons collected from Japan (e.g., Okue, Tono, Toki and Kurobegawa granites) to estimate their thermal history. We could estimate the crystallization ages and temperatures of zircons of Okue (556-946$$^{circ}$$C in 11.1-16.1 Ma), Tono (613-901$$^{circ}$$C in 110.2-127.4 Ma), Toki (575-734$$^{circ}$$C in 69.4-79.9 Ma) and Kurobegawa (636-779$$^{circ}$$C in 0.46-1.85 Ma), respectively.

Oral presentation

Simultaneous determination of zircon U-Pb age and titanium concentration using LA-ICP-MS; Case studies of the Kurobegawa granite, the Toki granite and the Tono plutonic complex

Ishibashi, Kozue*; Sakata, Shuhei*; Yokoyama, Tatsunori; Ito, Daichi*; Ogita, Yasuhiro; Yagi, Koshi*; Ono, Takeshi*; Yuguchi, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Simultaneous determination of zircon U-Pb age and titanium concentration using LA-ICP-MS; A Case study of the Okueyama granite, Kyusyu, Japan

Ito, Daichi*; Ishibashi, Kozue*; Sakata, Shuhei*; Yokoyama, Tatsunori; Ogita, Yasuhiro; Yagi, Koshi*; Ono, Takeshi*; Yuguchi, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Intrusive and emplacement process of the Tono plutonic complex; Constraints from dating and isotopic analysis of zircons

Ogita, Yasuhiro; Sando, Kazusa*; Ishibashi, Kozue*; Sakata, Shuhei*; Ono, Takeshi*; Suzuki, Satoshi*; Yokoyama, Tatsunori; Kagami, Saya; Nagata, Mitsuhiro; Yuguchi, Takashi*

no journal, , 

no abstracts in English

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