In situ ²⁰⁷Pb/²⁰⁶Pb isotope ratio measurements using two Daly detectors equipped on an ICP-mass spectrometer

Abstract

The simultaneous detection of 206Pb and 207Pb ions has been made by multiple-ion counting ICP-mass spectrometry using two Daly detectors (MC-ICPMS).

Timescale of material circulation in subduction zone: U–Pb zircon and K–Ar phengite double‐dating of the Sanbagawa metamorphic complex in the Ikeda district, central Shikoku, southwest Japan

“…The U–Pb analyses were carried out using the following three sets of laser ablation–inductively coupled plasma–mass spectrometer (LA–ICP–MS) systems: a quadrupole ICP–MS combined with an ArF excimer laser at the Division of Earth and Planetary Sciences, Kyoto University, Japan; a multi‐collector ICP–MS combined with a femtosecond laser at the Geochemical Research Center of the University of Tokyo, Tokyo, Japan; and a quadrupole ICP–MS with a Nd‐YAG laser at the Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan. Details of the analytical settings are listed in Table (Kouchi et al, ; Obayashi, Tanaka, Hattori, Sakata, & Hirata, ). We used the 91,500 zircon as primary standard zircon, and the GJ‐1(Jackson, Pearson, Griffin, & Belousova, : reference age: 608.5 ±0.4 Ma), Pleišovice (Sláma et al, : reference age: 337.13 ±0.37 Ma) and OD‐3 zircons (Iwano et al, : reference age: 33.0 ±0.1 Ma) as secondary standard zircon.…”

U–Pb ages of granitoids around the Kofu basin: Implications for the Neogene geotectonic evolution of the South Fossa Magna region, central Japan

“…A signal‐smoothing device was set between the sample cell and the torch, to improve the stability of the signal intensity (Tunheng & Hirata, 2004). The detailed setup condition of the ICP‐MS system was almost similar to those of Hattori, Sakata, Tanaka, Orihashi, and Hirata (2017) and Obayashi, Tanaka, Hattori, Sakata, and Hirata (2017), apart from the fact that we used a Daly detector to monitor the 238 U signal instead of an electron multiplier. The plasma condition and the torch position were optimized to maximize signal intensities for 238 U of NIST SRM 610 or 612, and the formation rate of thorium oxide ( 232 Th 16 O + / 232 Th + ) was set to less than 1.5 %.…”

Atomic spectrometry update – a review of advances in environmental analysis

“…In the field of LA-ICP-MS U-Pb zircon geochronology, an interesting contribution 423 demonstrated the capabilities of a detector system equipped with 16 FCs, 4 EMs and two Daly detectors for the simultaneous detection of 206 Pb and 207 Pb. The Daly detectors featured better long-term gain stability compared to a conventional EM during 10 h runs monitoring 135 Ba/ 138 Ba and 136 Ba/ 138 Ba.…”