Dual Separation of Krypton and Argon from Environmental Samples for Radioisotope Dating

Dong, Xian‐Zi; Ritterbusch, Florian; Chu, Yan-Qing; Gu, Ji‐Qiang; Hu, Shui-Ming; Jiang, Wei; Lu, Zheng‐Tian; Yang, Guo‐Min; Zhao, Lei

doi:10.1021/acs.analchem.9b02716

Cited by 14 publications

(7 citation statements)

References 23 publications

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“…In case of groundwater wells, a hydrophobic membrane was used to extract dissolved gas from water and convey the extracted gas to evacuated tanks (Jiang et al, 2020;Yokochi, 2016). Kr separation from the gases and the 81 Kr analysis, using Atom Trap Trace Analysis (ATTA), were performed at the University of Science and Technology of China (Dong et al, 2019;Jiang et al, 2012Jiang et al, & 2020. Detailed methods for sampling and analysis are described in Text S1 in Supporting Information S1.…”

Section: Methodsmentioning

confidence: 99%

Krypton‐81 Dating Constrains Timing of Deep Groundwater Flow Activation

Kim

Ferguson

Person

et al. 2022

Geophysical Research Letters

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Krypton‐81 dating provides new insights into the timing, mechanisms, and extent of meteoric flushing versus retention of saline fluids in the subsurface in response to changes in geologic and/or climatic forcings over 50 ka to 1.2 Ma year timescales. Remnant Paleozoic seawater‐derived brines associated with evaporites in the Paradox Basin, Colorado Plateau, are beyond the 81Kr dating range (>1.2 Ma) and have likely been preserved due to negative fluid buoyancy and low permeability. 81Kr dating of formation waters above the evaporites indicates topographically‐driven meteoric recharge and salt dissolution since the Late Pleistocene (0.03–0.8 Ma). Formation waters below the evaporites (up to 3 km depth), in basal aquifers, contain relatively young meteoric water components (0.4–1.1 Ma based on 81Kr) that partially flushed remnant brines and dissolved evaporites. We demonstrate that recent, rapid denudation of the Colorado Plateau (<4–10 Ma) activated deep, basinal‐scale flow systems as recorded in 81Kr groundwater age distributions.

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Section: Methodsmentioning

confidence: 99%

Krypton‐81 Dating Constrains Timing of Deep Groundwater Flow Activation

Kim

Ferguson

Person

et al. 2022

Geophysical Research Letters

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“…In 2019 to 2021, Core2014-2 samples were processed, degassed, and analyzed for

Ar and

Kr as described in Materials and Methods . The recently developed dual separation of argon and krypton with high recovery and purity ( 52 ) has allowed us to measure

Ar and

Kr in the same gas extracted from an ice sample. The full dataset for the measured ice samples is compiled in Table 1 .…”

Section: Resultsmentioning

confidence: 99%

A Tibetan ice core covering the past 1,300 years radiometrically dated with ³⁹ Ar

Ritterbusch

Tian

Tong

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Ice cores from alpine glaciers are unique archives of past global and regional climate conditions. However, recovering climate records from these ice cores is often hindered by the lack of a reliable chronology, especially in the age range of 100 to 500 anni (a) for which radiometric dating has not been available so far. We report on radiometric 39 Ar dating of an ice core from the Tibetan Plateau and the construction of a chronology covering the past 1,300 a using the obtained 39 Ar ages. This is made possible by advances in the analysis of 39 Ar using the laser-based detection method atom trap trace analysis, resulting in a twofold increase in the upper age limit of 39 Ar dating. By measuring the anthropogenic 85 Kr along with 39 Ar we quantify and correct modern air contamination, thus removing a major systematic uncertainty of 39 Ar dating. Moreover, the 85 Kr data for the top part of the ice core provide information on firn processes, including the age difference between the ice and its enclosed gas. This first application of 39 Ar and 85 Kr to an ice core facilitates further ice cores from nonpolar glaciers to be used for recovering climate records of the Common Era, a period including pronounced anomalies such as the Little Ice Age and the Medieval Warm Period.

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“…The extracted gas is transferred to a purification system (Dong et al., 2019), where it first passes a molecular sieve (MS5A) trap to remove water and CO 2 . Subsequently, all chemically reactive gases, including N 2 , O 2 , etc., are removed by a titanium getter.…”

Section: Methodsmentioning

confidence: 99%

Estimation of the Ventilation Transit Time Distribution at the Yap−Mariana Junction Using ³⁹Ar, ⁸⁵Kr and ¹⁴C Tracers

Jiang

Yang

et al. 2022

JGR Oceans

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We report on a multi-tracer study at the Yap-Mariana Junction in the western Pacific using three tracers-85 Kr, 39 Ar, and 14 C-with different half-lives and source functions to the oceans. The vertical profiles of 85 Kr and 39 Ar are measured using the state-of-the-art Atom Trap Trace Analysis method. This method allows analysis of 85 Kr and 39 Ar isotopes with samples collected in regular Niskin bottles. Combined with the calculated natural 14 C data, we infer the ventilation transit-time distribution (TTD) at the Yap-Mariana Junction. The mean ages of the seawater below the thermocline at the Yap-Mariana Junction are over 1,000 years. Moreover earlier 39 Ar and natural 14 C data collected in other parts of the Pacific are used to infer the local TTDs and compared with the one at the Yap-Mariana Junction. The age spectra of the Pacific bottom waters show progressive changes and increasing tails of the old water along the route from south to north. The dominance of the North Pacific Deep Water (NPDW) in the North Pacific and the effect of mixing between old water masses and younger ones at the Yap-Mariana Junction are reflected from the different shapes of the TTDs at these locations. The TTD shows the oldest water exists at about 2,000 m depth in the North Pacific. The western Pacific shows the highest degree of mixing at 1,000 m depth, while the southern Pacific has the highest degree of mixing close to the bottom. Plain Language SummaryTracers with different time responses are versatile tools for studying ventilation and mixing processes in the ocean. We conducted a multi-tracer study at the Yap-Mariana Junction in the western Pacific using 85 Kr, 39 Ar, and 14 C. The tracer data are used to constrain the ventilation time at this location and show that the mean ages of the seawater below the thermocline are over 1,000 years. The local ventilation time differs significantly from the ones determined at other locations across the Pacific Ocean.

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Dual Separation of Krypton and Argon from Environmental Samples for Radioisotope Dating

Cited by 14 publications

References 23 publications

Krypton‐81 Dating Constrains Timing of Deep Groundwater Flow Activation

Krypton‐81 Dating Constrains Timing of Deep Groundwater Flow Activation

A Tibetan ice core covering the past 1,300 years radiometrically dated with ³⁹ Ar

Estimation of the Ventilation Transit Time Distribution at the Yap−Mariana Junction Using ³⁹Ar, ⁸⁵Kr and ¹⁴C Tracers

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Dual Separation of Krypton and Argon from Environmental Samples for Radioisotope Dating

Cited by 14 publications

References 23 publications

Krypton‐81 Dating Constrains Timing of Deep Groundwater Flow Activation

Krypton‐81 Dating Constrains Timing of Deep Groundwater Flow Activation

A Tibetan ice core covering the past 1,300 years radiometrically dated with 39 Ar

Estimation of the Ventilation Transit Time Distribution at the Yap−Mariana Junction Using 39Ar, 85Kr and 14C Tracers

Contact Info

Product

Resources

About

A Tibetan ice core covering the past 1,300 years radiometrically dated with ³⁹ Ar

Estimation of the Ventilation Transit Time Distribution at the Yap−Mariana Junction Using ³⁹Ar, ⁸⁵Kr and ¹⁴C Tracers