Dating sedimentary rocks using in situ U-Pb geochronology of syneruptive zircon in ash-fall tuffs <1 mm thick

Rasmussen, Birger; Fletcher, Ian R.

doi:10.1130/g30567.1

Cited by 39Geological and Geochemical AnalysisAstro and Planetary SciencePaleontology and Stratigraphy of Fossils

Dating sedimentary rocks using in situ U-Pb geochronology of syneruptive zircon in ash-fall tuffs <1 mm thick

Rasmussen, Birger, Fletcher, Ian R.·2010·Geology

DOI 10.1130/g30567.1

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Abstract

Absolute ages for sedimentary rocks are required to construct a temporal framework in which to decipher Earth's history. The most reliable method for dating Precambrian sedimentary rocks is U-Pb geochronology of zircon in intercalated volcanic rocks. However, extracting sufficient zircons involves destructive mineral separation procedures, often requiring several kilograms of sample. We have dated felsic tuffs <1 mm thick using single polished thin sections from diamond drill core of Neoarchean shale from the Pilbara craton, Australia. The tuffs contain abundant euhedral zircon crystals, commonly 10–30 μm long. In situ SHRIMP (sensitive high-resolution ion microprobe) geochronology of the zircon in 8 tuffs gives 207Pb/206Pb dates between ca. 2600 Ma and ca. 2680 Ma, all consistent with their stratigraphic position and available age constraints.The dates represent the timing of syndepositional volcanism and provide reliable estimates for the age of deposition. Zircons in a 0.5 mm tuff band 15 mm above the Jeerinah impact layer provide an age of 2632 ± 7 Ma, which represents a close approximation for the timing of a major asteroid impact, the strewn field of which is distributed across two Archean cratons. In situ geochronology of zircon in felsic tuffs requires only small volumes of sample and is especially useful for drill core samples where material is limited. It avoids the destruction of samples associated with mineral separation, retaining textural information and avoiding potential contamination. This approach adds significantly to the number of sedimentary rocks that can be dated accurately.

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AIDP-2 and RHDH2A intersect the same Carawine Dolomite and Jeerinah Formation, so they sample the same stratigraphy and underwent the same regional metamorphism.
“Spatially separated by less than 1 km, AIDP-2 and RHDH2A both intersect the Carawine Dolomite (<2.63 Ga) of the Hamersley Group and the Jeerinah Formation (2.63-2.67Ga) of the Fortescue Group (20), so they sample the same stratigraphy and have experienced the same regional metamorphic effects (Fig. 1).”
From Reappraisal of hydrocarbon biomarkers in Archean rocks (2015) · cites this paper as [20]

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Authors: Rasmussen, B., & Fletcher, I. R.
Affiliations: Curtin University (AU)
ORCID: Rasmussen, Birger
Venue: Geology
Publisher: Geological Society of America
Published: 2010-04
Volume: 38
Issue: 4
Pages: 299-302
ISSN: 0091-7613 (ISSN-L)
1943-2682
DOI: 10.1130/g30567.1
OpenAlex: W1975545888
Cited by: 39
References: 11
Citations by year: 2025: 1 · 2024: 2 · 2023: 1 · 2022: 4 · 2021: 1 · 2020: 1 · 2019: 4 · 2018: 7 · 2017: 5 · 2016: 3 · 2015: 1 · 2013: 3 · 2012: 2
FWCI: 2.61
Type: journal article
Language: en
Open access: closed
Locations: Geology (publishedVersion)
eSpace (Curtin University) (submittedVersion)
Funders: Australian Government
Government of Western Australia
Australian Research Council
Topics: Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
Keywords: zircon U-Pb geochronology, ash-fall tuffs, Precambrian sedimentary rocks, Neoarchean, Pilbara Craton, asteroid impact, drill core sample, thin sections, Archean cratons

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Dating sedimentary rocks using in situ U-Pb geochronology of syneruptive zircon in ash-fall tuffs <1 mm thick

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