Step heating of 40Ar/39Ar standard mineral mixtures: Investigation of a fine-grained bulk sediment provenance tool

VanLaningham, Sam; Mark, Darren F.

doi:10.1016/j.gca.2011.01.038

Cited by 25 publications

(32 citation statements)

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“…Our robust 40 Ar/ 39 Ar data are a product of the high-resolution approach to the step-heating experiments 25 , and employment of procedures 21 to make appropriate corrections for cosmogenic and chlorine-derived 36,38 Ar—which is important given the aforementioned abundance of chlorine in the nakhlites (Fig. 2 , sometimes >1000 ppm Cl 22 ).…”

Section: Resultsmentioning

confidence: 99%

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Taking the pulse of Mars via dating of a plume-fed volcano

et al. 2017

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Mars hosts the solar system’s largest volcanoes. Although their size and impact crater density indicate continued activity over billions of years, their formation rates are poorly understood. Here we quantify the growth rate of a Martian volcano by 40Ar/39Ar and cosmogenic exposure dating of six nakhlites, meteorites that were ejected from Mars by a single impact event at 10.7 ± 0.8 Ma (2σ). We find that the nakhlites sample a layered volcanic sequence with at least four discrete eruptive events spanning 93 ± 12 Ma (1416 ± 7 Ma to 1322 ± 10 Ma (2σ)). A non-radiogenic trapped 40Ar/36Ar value of 1511 ± 74 (2σ) provides a precise and robust constraint for the mid-Amazonian Martian atmosphere. Our data show that the nakhlite-source volcano grew at a rate of ca. 0.4–0.7 m Ma−1—three orders of magnitude slower than comparable volcanoes on Earth, and necessitating that Mars was far more volcanically active earlier in its history.

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Section: Resultsmentioning

confidence: 99%

“…The highly reproducible age data are consistent with the near-pristine character of the meteorites and associated low degrees of shock metamorphism 17 . The experimental design 25 also facilitated resolution of the different argon reservoirs in each meteorite (Fig. 2a–c ).…”

Section: Resultsmentioning

confidence: 99%

Taking the pulse of Mars via dating of a plume-fed volcano

et al. 2017

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“…In contrast, no FMAs have been detected in step ‐ heating experiments on artificially created mixtures (e.g. Kula et al ., ; Vanlaningham & Mark, ; Kula & Spell, ).…”

Section: Does the Methods Of Asymptotes And Limits Work?mentioning

confidence: 99%

White mica ⁴⁰Ar/³⁹Ar age spectra and the timing of multiple episodes of high‐P metamorphic mineral growth in the Cycladic eclogite–blueschist belt, Syros, Aegean Sea, Greece

Lister

Forster

2016

Journal Metamorphic Geology

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New geochronology from Syros in the Cycladic eclogite-blueschist belt, Aegean Sea, Greece, shows that 40 Ar/ 39 Ar geochronology consistently dates microstructural events in metamorphic rocks. We demonstrate that the age spectra depend on microstructure in a predictable and systematic way. Ages can be inferred by applying the method of asymptotes and limits to data from the step-heating experiments. The results are consistent with previously published estimates for the timing of a sequence of distinct and discrete episodes of high-P metamorphic mineral growth observed regionally across this belt. Arrhenius plots from these experiments imply that phengitic white mica is highly retentive of argon, and therefore (if these data can be extrapolated to the natural environment) the ages can be interpreted as recording the timing of episodic deformation and metamorphism. Porphyroblastic growth begins: (i) for omphacite-jadeite-eclogite facies parageneses at c. 53 Ma; and (ii) for garnetglaucophane facies parageneses at c. 47 Ma. The Kini Shear Zone started as an extensional postepidote-albite-transitional-blueschist facies shear zone that had completed operation by c. 31 Ma. The scatter in ages is due to the effect of deformation, recrystallization and multiple growth events in shear zones that continued operating for 3-6 million years from the start of each episode.

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“…Mineral chemistry and bulk-rock geochemistry, especially isotopic geochemistry, have also proven useful in provenance studies (e.g., Krippner et al, 2014;Li et al, 2015;Weldeab et al, 2002;Zahid and Barbeau, 2013). In recent years, sediment provenance studies have been revolutionized by technological developments enabling single-grain radiometric dating of some components of the detrital grain population, for example U-Pb dating of zircon (Bertotti et al, 2014;Jiang et al, 2015;Morton et al, 2008;Shao et al, 2016;Xu et al, 2016;Yao et al, 2014) and rutile (Bracciali et al, 2013), and Ar-Ar dating of hornblende (Hemming et al, 2000), mica (Haines et al, 2004;Van Hoang et al, 2010), and bulk sediments (Van Laningham and Mark, 2011).…”

Section: Introductionmentioning

confidence: 99%

Using zircon U–Pb ages to constrain the provenance and transport of heavy minerals within the northwestern shelf of the South China Sea

Zhong

Yan

et al. 2017

Journal of Asian Earth Sciences

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Numerous ore-grade heavy mineral placer deposits occur in the northern South China Sea region. Previous studies on these deposits have focused on the heavy-mineral ore resources themselves, but the provenance and transport pathways of these heavy minerals are poorly constrained. This paper presents U-Pb ages of detrital zircons from sediments within the northwestern shelf of the South China Sea, and uses this new dataset to determine the provenance and transport pathway of the sediments. Zircons in sediments from ten areas of the northwestern shelf exhibit distinct age populations, suggesting that they have multiple provenances. Zircons in sediments from the Pearl River Mouth, Shangchuan Island, and Moyang River Mouth areas all have an obvious peak of Mesozoic ages, indicating that they have similar sediment

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Step heating of 40Ar/39Ar standard mineral mixtures: Investigation of a fine-grained bulk sediment provenance tool

Cited by 25 publications

References 50 publications

Taking the pulse of Mars via dating of a plume-fed volcano

Taking the pulse of Mars via dating of a plume-fed volcano

White mica ⁴⁰Ar/³⁹Ar age spectra and the timing of multiple episodes of high‐P metamorphic mineral growth in the Cycladic eclogite–blueschist belt, Syros, Aegean Sea, Greece

Using zircon U–Pb ages to constrain the provenance and transport of heavy minerals within the northwestern shelf of the South China Sea

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Step heating of 40Ar/39Ar standard mineral mixtures: Investigation of a fine-grained bulk sediment provenance tool

Cited by 25 publications

References 50 publications

Taking the pulse of Mars via dating of a plume-fed volcano

Taking the pulse of Mars via dating of a plume-fed volcano

White mica 40Ar/39Ar age spectra and the timing of multiple episodes of high‐P metamorphic mineral growth in the Cycladic eclogite–blueschist belt, Syros, Aegean Sea, Greece

Using zircon U–Pb ages to constrain the provenance and transport of heavy minerals within the northwestern shelf of the South China Sea

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White mica ⁴⁰Ar/³⁹Ar age spectra and the timing of multiple episodes of high‐P metamorphic mineral growth in the Cycladic eclogite–blueschist belt, Syros, Aegean Sea, Greece