The matrix effect on 238U and 232Th measurements using pressed powder pellets by LA-ICP-MS

Ito, Kazumi; Hasebe, Noriko; Hasebe, Akihiro Tamura; Arai, Shoji

doi:10.2343/geochemj.1.0132

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…Non-matrix matched calibration with NIST SRM610-614 glasses fails for some elements. 45 Here, matrix-matched calibration was achieved by calculating average "bias factors" for each element that were derived from the analysis of pressed powder tablets of basalts BCR-2 and BIR-1. These factors were applied to rock types with broadly "similar" chemical matrix composition, for example basalt BHVO-2 and diorite DR-N. Fig.…”

Section: Accuracy Of Analytical Results For Some Geochemical Rock Crmsmentioning

confidence: 99%

“…Arroyo et al 44 dry-ground soil and sediment samples for 20 minutes by means of a high power mill and obtained particles with an average grain size of d 50 < 10 mm. Ito and coworkers 45 picked up the concept of dry ne-grinding and studied matrix effects on 238 U and 232 Th related to the grain size and nonmatrix matched calibration. There is a consensus from these studies that small grain sizes <10 mm are a prerequisite for homogeneity and acceptable data quality obtainable with ablation spot sizes of 80-200 mm.…”

Section: Introductionmentioning

confidence: 99%

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Nano-particulate pressed powder tablets for LA-ICP-MS

Garbe‐Schönberg

Müller

2014

J. Anal. At. Spectrom.

150

136

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Section: Accuracy Of Analytical Results For Some Geochemical Rock Crmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nano-particulate pressed powder tablets for LA-ICP-MS

Garbe‐Schönberg

Müller

2014

J. Anal. At. Spectrom.

150

136

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“…) using integrated signal intensities (Ito et al . ). The signals were collected from a laser pit of 40 μm diameter × 50 μm depth.…”

Section: Methodsmentioning

confidence: 97%

A multi‐geochronological study of the Hakusan volcano, central Japan

et al. 2016

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The Hakusan volcano, central Japan, is located in a region where two subducting plates (the Pacific Plate and the Philippine Sea Plate) overlap near the junction of four plates adjacent to the Japanese Islands (the Pacific Plate, the Philippine Sea Plate, the Eurasia Plate, and the North American Plate). The Hakusan volcano consists of products from four major volcanic episodes: Kagamuro, Ko-hakusan, and Shin-Hakusan I and II. To date the eruption events of the Hakusan volcano we applied thermoluminescence and fission track methods. 238 U( 234 U)-230 Th disequilibrium and 206 Pb/ 238 U methods were applied to date the zircon crystallization ages for estimating the magma residence time before the eruptions. The eruption ages we obtained are ca 250 ka for Kagamuro, ca 100 ka and ca 60 ka for Ko-Hakusan, ca 50 ka for Shin-Hakusan I, and <10 ka for Shin-Hakusan II. They are concordant with previous reports based on K-Ar dating. Some of the pyroclastic rocks, possibly originating from Shin-Hakusan II activities, are dated to be ca 36 ka or 50 ka, and belong to the Shin-Hakusan I activity. The zircon crystallization ages show several clusters prior to eruption. The magma residence time was estimated for each volcanic activity by comparing the major crystallization events and eruption ages, and we found a gradual decrease from ca. 500 ky for the Kagamuro activity to ca. 5 ky for the ShinHakusan II activity. This decrease in residence time may be responsible for the decrease in volume of erupted material estimated from the current topography of the region. The scale of volcanic activity, which was deduced from the number of crystallized zircons, is more or less constant throughout the Hakusan volcanic activity. Therefore, the decrease in magma residence time is most likely the result of stress field change.

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