Whole rock multiple trace element analyses using fused glass bead by laser ablation-ICP-MS

Yamasaki, Toru; Yamashita, Kohei

doi:10.9795/bullgsj.67.27

Cited by 15 publications

(8 citation statements)

References 22 publications

(26 reference statements)

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“…Wholerock trace element compositions were measured using LA-ICP-MS (New Wave Research NWR213 LA coupled with Agilent 7700x ICP-MS). Detailed analytical procedures are given in Yamasaki et al (2015) and Yamasaki and Yamashita (2016). The data quality of the XRF and whole-rock LA-ICP-MS was monitored with measurements of U.S. Geological Survey and GSJ geochemical reference materials, respectively.…”

Section: Analytical Procedures and Resultsmentioning

confidence: 99%

Three types of greenstone from the Hidaka belt, Hokkaido, Japan: Insights into geodynamic setting of northeastern margin of the Eurasian plate in the Paleogene

Yamasaki

Nanayama

2020

Journal of Mineralogical and Petrological Sciences

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The Hidaka belt in Central Hokkaido, Japan, consists of an early Paleogene subduction complex, referred to as the Hidaka Supergroup, dominated by clastic rocks. The southern area of the Hidaka Supergroup is referred to as the Nakanogawa Group, which gradually leads to the high-temperature Hidaka metamorphic belt in the western part. We collected 17 samples of greenstone from the entire Hidaka belt and examined their wholerock major and trace element geochemistry. Including those described in previous reports, three distinct types of greenstone exist in the Hidaka belt. Type 1 greenstone is an ocean island basalt-type greenstone. The multielement and rare earth element (REE) patterns for this type of greenstone show a steep slope up to the left, with Ti/V > 62 and Zr/Nb < 15. Type 2 greenstone is a mid-ocean ridge basalt (MORB)-type greenstone that shows relatively flat chondrite-normalized REE patterns and a gentle slope up to the left on the normal-MORBnormalized multi-element patterns with Ti/V = 26-53 and Zr/Nb = 21-117. Type 3 greenstone shows multielement and REE patterns similar to those of Type 1, but with a clear relative depletion of Nb, Ta, and Ti. In addition, its Ti-V relations are similar to those of Type 2 greenstone. Type 1 and Type 3 greenstones occur only in the Nakanogawa Group. Type 2 greenstone is mostly distributed in the northern the Hidaka Supergroup. Type 1 and Type 3 greenstones were generated by igneous activity on the Izanagi Plate, which was being subducted during the formation of the subduction complex of the Hidaka belt. Type 2 greenstone is interpreted as a product of a spreading axis that was active during the formation of the same subduction complex. Whereas Type 2 greenstone has been regarded as having a typical MORB-like geochemical signature, our results show slightly different, Indian Ocean MORB-type trace element patterns. These geochemical signatures are different than those of the amphibolites in the Hidaka metamorphic belt. The protolith of the amphibolite is not equivalent to the Type 2 greenstones and is probably an accreted fragment of an older oceanic plate. Type 2 greenstone was presumably generated from upper mantle with an Indian mantle-like geochemical signature during the Izanagi-Pacific ridge subduction on the western margins of the Pacific Ocean around 48 Ma.

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Section: Analytical Procedures and Resultsmentioning

confidence: 99%

Three types of greenstone from the Hidaka belt, Hokkaido, Japan: Insights into geodynamic setting of northeastern margin of the Eurasian plate in the Paleogene

Yamasaki

Nanayama

2020

Journal of Mineralogical and Petrological Sciences

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“…Trace element contents were determined by laser ablation inductively coupled plasma mass spectrometry at GSJ, using a custom‐built laser sampling system interfaced between a New Wave Research NWR213 laser ablation system and an Agilent 7700× quadrupole inductively coupled plasma mass spectrometry. The laser ablation system consists of a Nd:YAG laser that generates an output wavelength of 213 nm and a maximum pulse energy of >30 J/cm 2 ; detailed information about the instrument is given in Yamasaki and Yamashita (). Laser ablation was performed using a 100‐μm laser spot size, a repetition rate of 10 Hz, a laser energy of ~20 J/cm 2 , a rastered area of 500 μm × 500 μm, and a raster speed of 20 μm/s.…”

Section: Methodsmentioning

confidence: 99%

Indian Monsoonal Variations During the Past 80 Kyr Recorded in NGHP‐02 Hole 19B, Western Bay of Bengal: Implications From Chemical and Mineral Properties

Ota

Kawahata

Kuroda

et al. 2019

Geochem Geophys Geosyst

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Detailed reconstruction of Indian summer monsoons is necessary to better understand the late Quaternary climate history of the Bay of Bengal and Indian peninsula. We established a chronostratigraphy for a sediment core from Hole 19B in the western Bay of Bengal, extending to approximately 80 kyr BP and examined major and trace element compositions and clay mineral components of the sediments. Higher δ18O values, lower TiO2 contents, and weaker weathering in the sediment source area during marine isotope stages (MIS) 2 and 4 compared to MIS 1, 3, and 5 are explained by increased Indian summer monsoonal precipitation and river discharge around the western Bay of Bengal. Clay mineral and chemical components indicate a felsic sediment source, suggesting the Precambrian gneissic complex of the eastern Indian peninsula as the dominant sediment source at this site since 80 kyr. Trace element ratios (Cr/Th, Th/Sc, Th/Co, La/Cr, and Eu/Eu*) indicate increased sediment contributions from mafic rocks during MIS 2 and 4. We interpret these results as reflecting the changing influences of the eastern and western branches of the Indian summer monsoon and a greater decrease in rainfall in the eastern and northeastern parts of the Indian peninsula than in the western part during MIS 2 and 4.

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“…4. The standard deviations from five replicate analyses of reference materials (Yamasaki and Yamashita, 2016; JB-2 for basalt and basaltic andesite samples, JA-1 for dacite sample, and JR-1 for rhyolite sample) are included as references for the analytical errors (precision) at any given composition. Differences beyond analytical errors were observed for major elements for the three suites of samples, and samples from suite 2 displayed similar compositions to samples from suite 3 for several elements (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The error bars and shaded areas showing the standard deviations (S.D. ; n=5) were extrapolated from the analytical results for reference materials (Yamasaki and Yamashita, 2016) with similar compositional ranges; JB-2 for the basalt and the basaltic andesite samples; JA-1 for the dacite samples; and JR-1 for the rhyolite samples. The symbols and colors are the same as in Fig.…”

Section: Discussionmentioning

confidence: 99%

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Contamination from mortars and mills during laboratory crushing and pulverizing

Yamasaki

2018

Bull. Geol. Surv. Japan

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Contamination of rock samples from laboratory equipment during crushing and pulverizing was investigated. Pulverization using iron and tungsten carbide mortars, and agate and tungsten carbide mills produced three suites of powders. Whole-rock data from the analyses of the three suites of samples enabled assessment of the degree of contamination of samples by coarse crushing and pulverization. The samples analyzed for major and trace elements compositionally represent basalt, basaltic andesite, dacite, and rhyolite. The results from the analyses of major elements exhibit insignificant contamination from the mortars and the mills. The heterogeneity of rock chips explains the compositional differences observed. The tungsten carbide mill contaminated samples with tungsten and cobalt. The significant scatter of other trace elements data is attributed to sample heterogeneity, with no systematic effect from contamination.

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Whole rock multiple trace element analyses using fused glass bead by laser ablation-ICP-MS

Cited by 15 publications

References 22 publications

Three types of greenstone from the Hidaka belt, Hokkaido, Japan: Insights into geodynamic setting of northeastern margin of the Eurasian plate in the Paleogene

Three types of greenstone from the Hidaka belt, Hokkaido, Japan: Insights into geodynamic setting of northeastern margin of the Eurasian plate in the Paleogene

Indian Monsoonal Variations During the Past 80 Kyr Recorded in NGHP‐02 Hole 19B, Western Bay of Bengal: Implications From Chemical and Mineral Properties

Contamination from mortars and mills during laboratory crushing and pulverizing

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