New high-precision measurements of the isotopic composition of atmospheric argon

Mark, Darren F.; Stuart, Finlay M.; Podesta, Michael de

doi:10.1016/j.gca.2011.09.042

Cited by 136 publications

(116 citation statements)

References 37 publications

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“…A subsequent study [20] demonstrated improved analytical precision is possible, supported the relatively high 40 Ar/ 36 Ar ratio for atmospheric Ar of Lee et al [4], and confirmed isotopic variability among purified atmospheric Ar tank gases. Another subsequent study [21] supported the partially calibrated measurements of Lee et al [4] for both 40 Ar/ 36 Ar and 38 Ar/ 36 Ar. Most Ar isotope ratio measurements in the literature were made by static gas-source magnetic-sector mass spectrometry [22] and are expressed as simple molar ratios (e.g., 40 Ar/ 36 Ar, 38 Ar/ 36 Ar).…”

Section: Reference Materials and Reporting Of Isotope Ratiossupporting

confidence: 64%

Variation in the terrestrial isotopic composition and atomic weight of argon (IUPAC Technical Report)

Böhlke

2014

Pure and Applied Chemistry

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Abstract:The isotopic composition and atomic weight of argon (Ar) are variable in terrestrial materials. Those variations are a source of uncertainty in the assignment of standard properties for Ar, but they provide useful information in many areas of science. Variations in the stable isotopic composition and atomic weight of Ar are caused by several different processes, including (1) isotope production from other elements by radioactive decay (radiogenic isotopes) or other nuclear transformations (e.g., nucleogenic isotopes), and (2) Ar) at various levels of precision are widely used for studies in geochronology, water-rock interaction, atmospheric evolution, and other fields.

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Section: Reference Materials and Reporting Of Isotope Ratiossupporting

confidence: 64%

Variation in the terrestrial isotopic composition and atomic weight of argon (IUPAC Technical Report)

Böhlke

2014

Pure and Applied Chemistry

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“…The caldera (as visible today) extends over 2270 km 2 and is the product of the young Toba super-eruption. The super-eruption produced approximately 2800 km 3 of pyroclastic ejecta (2400 km 3 of dense rock equivalent) (Chesner, 1998;Mason et al, 2004;Matthews et al, 2012), a volume of comparable size to the largest Yellowstone super-eruption (Huckleberry Ridge Tuff; Ellis et al, 2012), but dwarfing other Quaternary eruptions (Fig. 2), including the 1815 eruption of Tambora.…”

Section: Introductionmentioning

confidence: 99%

A high-precision 40Ar/39Ar age for the Young Toba Tuff and dating of ultra-distal tephra: Forcing of Quaternary climate and implications for hominin occupation of India

Mark

Petraglia

Smith

et al. 2014

Quaternary Geochronology

107

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“…All data regression was undertaken in MassSpec version 8.131. Mass spectrometer discrimination was calculated per AMU using the power law, the average 40 Ar/ 36 Ar value from all air pipette analyses ( 40 Ar/ 36 Ar of 296.89 ± 0.99, 1 standard deviation, n = 85), and an atmospheric 40 Ar/ 36 Ar value of 298.56 ± 0.31 (Lee et al, 2006) which has been independently confirmed by Mark et al (2011). We have used the Alder Creek sanidine age of 1.1891 ± 0.0008 Ma (1σ uncertainty) (Niespolo et al, in press) and the potassium decay constants reported by Renne et al (2011).…”

Section: Methodsmentioning

confidence: 79%

Holocene-Neogene volcanism in northeastern Australia: Chronology and eruption history

Cohen

Mark

Fallon

et al. 2017

Quaternary Geochronology

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Quaternary and late Neogene volcanism is widespread in northeastern Australia, producing at least 397 eruptions covering more than 20,000 km 2 , including at least 20 flows over 50 km long. Despite this abundance of young volcanism, before this study numerous eruptions had tentative ages or were undated, and the area requires a comprehensive evaluation of eruption patterns through time. To help address these issues we applied multi-collector ARGUS-V 40 Ar/ 39 Ar geochronology to determine the age of four of the younger extensive flows: Undara (160 km long, 189 ± 4/4 ka; 2σ, with full analytical/external uncertainties), Murronga (40 km long, 153 ± 5/5 ka), Toomba (120 km long, 21 ± 3/3 ka), and Kinrara (55 km long, 7 ± 2/2 ka). Verbal traditions of the Gugu Badhun Aboriginal people contain features that may potentially describe the eruption of Kinrara. If the traditions do record this eruption, they would have been passed down for 230 ± 70 generations -a period of time exceeding the earliest written historical records. To further examine north Queensland volcanism through time we compiled a database of 337 ages, including 179 previously unpublished K-Ar and radiocarbon results. The compiled ages demonstrate that volcanic activity has occurred without major time breaks since at least 9 Ma. The greatest frequency of eruptions occurred in the last 2 Ma, with an average recurrence interval of <10-22 ka between eruptions. Activity was at at times likely more frequent than these calculations indicate, as the geochronologic dataset is incomplete, with undated eruptions, and intraplate volcanism is often episodic. The duration, frequency, and youthfulness of activity indicate that north Queensland volcanism should be considered as potentially still active, and there are now two confirmed areas of Holocene volcanism in eastern Australia -one at each end of the continent. More broadly, our data provides another example of 40 Ar/ 39 Ar geochronology applied to Holocene and latest Pleistocene mafic eruptions, further demonstrating that this method has the ability to examine eruptions and hazards at the youngest volcanoes on Earth.

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New high-precision measurements of the isotopic composition of atmospheric argon

Cited by 136 publications

References 37 publications

Variation in the terrestrial isotopic composition and atomic weight of argon (IUPAC Technical Report)

Variation in the terrestrial isotopic composition and atomic weight of argon (IUPAC Technical Report)

A high-precision 40Ar/39Ar age for the Young Toba Tuff and dating of ultra-distal tephra: Forcing of Quaternary climate and implications for hominin occupation of India

Holocene-Neogene volcanism in northeastern Australia: Chronology and eruption history

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