In-situ and meteoric 10Be and 26Al measurements: Improved preparation and application at the University of Tokyo

Yokoyama, Yūsuke; Yamane, Masako; Nakamura, Atsunori; Miyairi, Yosuke; Horiuchi, Kazuho; Aze, Takahiro; Matsuzaki, Hiroyuki; Shirahama, Yoshiki; Ando, Yuka

doi:10.1016/j.nimb.2019.01.026

Cited by 15 publications

(4 citation statements)

References 26 publications

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“… 56 , 57 ). The resulting hydroxide was converted to BeO powder using a microwave ceramic crucible 58 before being mixed with niobium, inserted into a copper cathode, and measured by a National Electrostatic Corporation accelerator mass spectrometer (AMS) at the UTokyo Micro Analysis Laboratory, Tandem Accelerator (MALT) 59 .…”

Section: Methodsmentioning

confidence: 99%

Holocene melting of the West Antarctic Ice Sheet driven by tropical Pacific warming

et al. 2022

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The primary Antarctic contribution to modern sea-level rise is glacial discharge from the Amundsen Sea sector of the West Antarctic Ice Sheet. The main processes responsible for ice mass loss include: (1) ocean-driven melting of ice shelves by upwelling of warm water onto the continental shelf; and (2) atmospheric-driven surface melting of glaciers along the Antarctic coast. Understanding the relative influence of these processes on glacial stability is imperative to predicting sea-level rise. Employing a beryllium isotope-based reconstruction of ice-shelf history, we demonstrate that glaciers flowing into the Amundsen Sea Embayment underwent melting and retreat between 9 and 6 thousand years ago. Despite warm ocean water influence, this melting event was mainly forced by atmospheric circulation changes over continental West Antarctica, linked via a Rossby wave train to tropical Pacific Ocean warming. This millennial-scale glacial history may be used to validate contemporary ice-sheet models and improve sea-level projections.

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Section: Methodsmentioning

confidence: 99%

Holocene melting of the West Antarctic Ice Sheet driven by tropical Pacific warming

et al. 2022

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“…To directly compare with reported Be and major element (Na, Ca, Mg, Fe, Mn, Al and Ti) estimates, 29,30 10 to 30 mg of each reference material underwent whole‐rock dissolution using a treatment of 5 mL HNO 3 at 100°C, 5 mL HNO 3 :2 mL HClO 4 at 180°C followed by 3 mL HF:1 mL HNO 3 at 100°C for 4 to 5 days, and then finally 2 mL of HCl 16,33 . To represent a range of leaching methods presented in the literature, we applied a “strong” ( 9 Be strong ) and “weak” ( 9 Be weak ) leaching solution on 1 g and 0.1 g aliquots of each reference material (Table 2).…”

Section: Methodsmentioning

confidence: 99%

“…All Be abundances are presented relative to their initial sample mass material underwent whole-rock dissolution using a treatment of 5 mL HNO 3 at 100 C, 5 mL HNO 3 :2 mL HClO 4 at 180 C followed by 3 mL HF:1 mL HNO 3 at 100 C for 4 to 5 days, and then finally 2 mL of HCl. 16,33 To represent a range of leaching methods presented in the literature, we applied a "strong" ( 9 Be strong ) and "weak" ( 9 Be weak ) leaching solution on 1 g and 0.1 g aliquots of each reference material (Table 2). The strong leaching treatment involved adding 20 mL g −1 sediment of 0.04 M NH 2 OH.HCl in 25% acetic acid at 80 C for 6 h.…”

Section: Sample Treatment Proceduresmentioning

confidence: 99%

Initial measurement of beryllium‐9 using high‐resolution inductively coupled plasma mass spectrometry allows for more precise applications of the beryllium isotope system within the Earth Sciences

Sproson

Aze

Behrens

et al. 2021

Rapid Comm Mass Spectrometry

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Rationale Precise and accurate determination of the ratio of the cosmogenic nuclide 10Be to the stable isotope 9Be (10Be/9Be) is needed across multiple fields of research within the Earth Sciences. Current techniques used to measure the 9Be content of geological materials generally require a large amount of sample or solution aliquot and present a large range of analytical precisions. Methods A range of geological reference materials underwent whole‐rock dissolution and “strong” (0.04 M NH2OH.HCl in 25% acetic acid) and “weak” (0.02 M NH2OH.HCl in 10% acetic acid) leaching to represent a range of potential applications within the geosciences. After treatment, the 9Be and major element (Na, Ca, Mg, Fe, Mn, Al and Ti) content of sample solutions were determined by high‐resolution inductively coupled plasma mass spectrometry (HR‐ICP‐MS) using a Thermo® ELEMENT XR instrument. Results The 9Be concentration of whole‐rock and leaching solutions displayed a wide range of values within each geological reference material, generally following a uniform relationship implying a potential kinetic control on NH2OH leaching, as suggested by major element profiles. A precision of 0.1 to 1.4% is achieved independent of sample size or leaching strength. Conclusions Initial results suggest that the use of HR‐ICP‐MS improves the precision of 9Be analysis for a range of geological reference materials. A high precision is maintained despite reducing the sample size or strength of leaching solution. This has implications for the use of the Be isotope system within the Earth Sciences by reducing the propagated uncertainty of 10Be/9Be ratios or the mass of sample or 9Be aliquot used.

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“…Results from Thiel et al (2015) and Ito et al (2017) suggest that K-feldspar pIRIR dating is appropriate for dating marine terraces and marine sediments formed during MIS 5 and older, even in locations where quartz OSL is deemed unsuitable. Limited studies have utilized cosmogenic nuclide dating ( 10 Be and 26 Al) to analyze MIS 5e-and MIS 7-associated terraces in the Kii Peninsula and Shikoku (Yokoyama et al, 2015(Yokoyama et al, , 2019b. Amino acid racemization has seen limited use in constraining MIS 5e terrace ages in Japan (e.g., Ota and Odagiri, 1994), as has electron spin resonance (ESR) dating (e.g., Ikeya and Ohmura, 1983).…”

Section: Other Techniquesmentioning

confidence: 99%

A review of MIS 5e sea-level proxies around Japan

Tam

Yokoyama

2021

Earth Syst. Sci. Data

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Abstract. Sea-level proxies for Marine Isotopic Stage 5e (MIS 5e, ca. 124 ka) are abundant along the Japanese shoreline and have been documented for over at least the past 60 years. The bulk of these sea-level proxies are identified in Japan as marine terraces, often correlated by stratigraphic relationships to identified tephra layers, or other chronologically interpreted strata. Use of stratigraphic correlation in conjunction with other techniques such as paleontological analysis, tectonic uplift rates, tephra (volcanic ash), uranium–thorium (U–Th), and carbon-14 (14C) dating have connected Japan's landforms to global patterns of sea-level change. This paper reviews over 60 years of publications containing sea-level proxies correlated with MIS 5e in Japan. Data collected for this review have been added to the World Atlas of Last Interglacial Shorelines (WALIS), following their standardizations on the elements necessary to analyze paleosea-levels. This paper reviewed over 70 studies, assembling data points for over 300 locations and examining related papers denoting sea-level indicators for MIS 5e. The database compiled for this review (Tam and Yokoyama, 2020) is available at https://doi.org/10.5281/zenodo.4294326. Sea-level proxy studies in Japan rely heavily on chronostratigraphic techniques and are recognized as reliable, though opportunities exist for further constraining through the further use of numerical age dating techniques.

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In-situ and meteoric 10Be and 26Al measurements: Improved preparation and application at the University of Tokyo

Cited by 15 publications

References 26 publications

Holocene melting of the West Antarctic Ice Sheet driven by tropical Pacific warming

Holocene melting of the West Antarctic Ice Sheet driven by tropical Pacific warming

Initial measurement of beryllium‐9 using high‐resolution inductively coupled plasma mass spectrometry allows for more precise applications of the beryllium isotope system within the Earth Sciences

A review of MIS 5e sea-level proxies around Japan

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