“U–Pb calcite age of the Late Permian Castile Formation, Delaware Basin: a constraint on the age of the Permian–Triassic boundary(?)”: Reply to a comment by Ian Metcalfe

Becker, Mona Louise; Rasbury, E. Troy; Meyers, William J.; Hanson, Gilbert N.

doi:10.1016/s0012-821x(03)00605-8

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…The Late Permian Castile Formation contains submillimeter‐scale brown calcite layers that are intercalated with gypsum (or anhydrite in the subsurface). It is assumed that the carbonate was originally aragonite on the basis of the elevated salinity of the parent fluids [ Becker et al , 2004]. Sr isotopic compositions from the Castile are quite uniform and record the Late Permian low values [ Denison et al , 1994; Kirkland et al , 2000].…”

Section: Results Of U‐pb Dating Of Carbonatesmentioning

confidence: 99%

Directly dating geologic events: U‐Pb dating of carbonates

Rasbury

Cole

2009

Reviews of Geophysics

139

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[1] Carbonates are ubiquitous, forming in a variety of settings including caves, soils, the oceans, during burial from hydrothermal fluids, and along faults. U-Pb dating of carbonates is applicable to almost the entire geologic time scale, with results from Pleistocene speleothems showing great promise for dating records <1 Ma old. Here we review studies of U-Pb dating of carbonates from a range of depositional and diagenetic environments and consider published results with regard to stratigraphic associations and the behavior of U and Pb in various fluids. We detail the steps required to select suitable samples, summarize current laboratory techniques, and provide directions for improvement of analytical protocols. The U-Pb dating of carbonates has tremendous potential for dating events of geologic interest and is virtually untapped.Citation: Rasbury, E. T., and J. M. Cole (2009), Directly dating geologic events: U-Pb dating of carbonates, Rev. Geophys., 47, RG3001,

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Section: Results Of U‐pb Dating Of Carbonatesmentioning

confidence: 99%

Directly dating geologic events: U‐Pb dating of carbonates

Rasbury

Cole

2009

Reviews of Geophysics

139

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Directly Dating Sedimentary Rocks

Rasbury¹,

Cole²

2006

Paleontol. Soc. pap.

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This contribution seeks to provide a summary of radiometric dating techniques that are currently applicable to Phanerozoic sedimentary deposits and therefore relevant to paleontologists. First we overview the assumptions necessary for radiometric dating and introduce isochrons and concordia diagrams as methods for calculating ages and evaluating isotope systematics. We then focus on the four most promising systems: U-Pb dating of carbonates, Re-Os dating of black shales, and U-Pb and Lu-Hf dating of phosphates. We review expected geochemical behavior of daughter and parent isotopes in the context of both marine and terrestrial depositional environments. A critical evaluation of previously published ages and potential directions for future work are provided.

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“U–Pb calcite age of the Late Permian Castile Formation, Delaware Basin: a constraint on the age of the Permian–Triassic boundary(?)”: Reply to a comment by Ian Metcalfe

Cited by 2 publications

References 14 publications

Directly dating geologic events: U‐Pb dating of carbonates

Directly dating geologic events: U‐Pb dating of carbonates

Directly Dating Sedimentary Rocks

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