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

Takashi Yuguchi; Kozue Ishibashi; Shuhei Sakata; Tatsunori Yokoyama; Daichi Itoh; Yasuhiro Ogita; Koshi Yagi; Takeshi Ohno

doi:10.1016/j.dib.2020.106092

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

Data Brief. 2020 Jul 29:32:106092. doi: 10.1016/j.dib.2020.106092. eCollection 2020 Oct.

Authors

Takashi Yuguchi¹, Kozue Ishibashi¹, Shuhei Sakata², Tatsunori Yokoyama³, Daichi Itoh¹, Yasuhiro Ogita³, Koshi Yagi⁴, Takeshi Ohno⁵

Affiliations

¹ Faculty of Science, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan.
² Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.
³ Japan Atomic Energy Agency, 959-31, Jorinji, Izumi-cho, Toki, Gifu 509-5102, Japan.
⁴ Hiruzen Institute for Geology and Chronology Co., Ltd., 2-5, Nakashima, Naka-ku, Okayama 703-8252, Japan.
⁵ Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo, 171-8588 Japan.

Abstract

Simultaneous determination of zircon U-Pb age and titanium concentration for a single analysis spot gives both the crystallization age and temperature. In laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis, it is challenging to quantitatively analyse a low level of titanium concentration. Two approaches were employed using a quadrupole mass spectrometer equipped with a collision/reaction cell (CRC). In the first approach, the MS/MS mass-shift mode with oxygen reaction gas provided reliable and consistent measurement of titanium as ⁴⁸Ti¹⁶O⁺. In the second approach, the titanium concentration was determined quantitatively from the signal intensity of ⁴⁹Ti in the non-gas mode (without the inflow of collision/reaction gas into the 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 (TCP). The biotite K-Ar geochronology were employed for rock samples of the KRG, OKG, and TPC (N = 3) of which the zircon crystals were analysed. The obtained titanium concentrations of the zircon crystals can lead to the crystallization temperatures through Ti-in-zircon geothermometer.

Keywords: Biotite K–Ar age; Crystallization age and temperature; Granitic rock; LA-ICP-MS; Time–temperature (t–T) path; Zircon U–Pb age and titanium concentration.