Direct radiometric age determination of carbonate diagenesis using U-Pb in secondary calcite

Smith, Peter; Farquhar, R. M.; Hancock, R. G. V.

doi:10.1016/0012-821x(91)90186-l

Cited by 58 publications

(18 citation statements)

References 21 publications

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“…Less attention has been paid to minerals such as fluorite, garnet, monazite, magnetite and allanite. Studies of carbonate minerals have enjoyed significant success in the application of U-series disequilibrium for dating of young rocks (e.g., Muhs and Szabo, 1994;Mallick and Frank, 2002;Robinson et al, 2004;Henderson and Slowey, 2000;Shen et al, 2004) and Paleozoic limestones have been dated using U-Pb and Pb-Pb techniques (e.g., Smith and Farquhar, 1989;Smith et al, 1991;Jones et al, 1995;Rasbury et al, 1997;Coveney et al, 2000) as has Cretaceous cave spar (Lundberg et al, 2000).…”

Section: Alpha Thermochronologymentioning

confidence: 98%

Alpha thermochronology of carbonates

Copeland

Watson

Urizar

et al. 2007

Geochimica et Cosmochimica Acta

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Section: Alpha Thermochronologymentioning

confidence: 98%

Alpha thermochronology of carbonates

Copeland

Watson

Urizar

et al. 2007

Geochimica et Cosmochimica Acta

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“…Direct dating of calcite and other carbonate minerals using the U-Pb system is an important tool to constrain the timing of processes such as carbonate deposition during key intervals of Earth history, carbonate diagenesis, metamorphism, fault activity, hydrothermal mineralization, and ancient weathering episodes (e.g., Babinski et al, 1995;Denniston et al, 2008;Godeau et al, 2018;Hill et al, 2016;Hoff et al, 1995;Jahn, 1988;Moorbath et al, 1987;Rasbury et al, 1998;Rasbury & Cole, 2009;Ring & Gerdes, 2016;Smith et al, 1991;Wang et al, 1998;Woodhead et al, 2010). Important prerequisites to the successful U-Pb dating of carbonates are a closed isotopic system, a homogeneous initial ("common") Pb composition, and a sufficient spread in the parent/daughter ratio.…”

Section: Introductionmentioning

confidence: 99%

An Image Mapping Approach to U‐Pb LA‐ICP‐MS Carbonate Dating and Applications to Direct Dating of Carbonate Sedimentation

Drost

Chew

Petrus

et al. 2018

Geochem Geophys Geosyst

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We present a new approach to laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) U‐Pb dating of carbonates based on selection and pooling of pixels from 2‐D elemental and isotopic ratio maps. This image mapping technique is particularly useful for targeting subdomains in samples with complex geological histories. Key major and trace elements that are sensitive to detrital components, postformational fluid ingress, mineralogical changes, or diagenetic overprinting are measured along with the Pb and U isotopic data. Laser sampling is undertaken along successive linear rasters that are compiled into maps using the Monocle add‐on for Iolite, with one pixel in the map corresponding to one time slice of the time‐resolved signal. These element, element ratio, and isotope ratio maps can be overlain over photomicrographs or scanning electron microscopy images to spatially link compositional data to textural and structural features. The pixels corresponding to likely homogeneous age domains can be isolated by applying appropriate selection criteria (e.g., Th < 0.3 ppm, Mg/Ca < 0.004) and pooled into pseudo‐analyses using a proxy for the parent/daughter ratio (e.g., 207Pb/235U, 238U/208Pb) to retrieve the largest possible spread of the data points on isochron diagrams. The approach is best suited for analytical setups capable of rapidly or simultaneously scanning over a large mass range and can yield a precision of ±1% or better on quadrupole instruments depending on U concentration, 238U/204Pb, and age of the sample. The sample‐specific filtering criteria for selection and rejection of data and their rationale can be reported, resulting in more transparency with regard to data processing.

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“…Of particular interest are the studies that have exploited the stability of primary and early diagenetic calcite and aragonite in near-surface environments. Time periods and environments previously studied include Devonian and Pennsylvanian corals and diagenetic calcite (Smith and Farquhar, 1989;Smith et al, 1991Smith et al, , 1994, Ordovician limestones (DeWolf and Halliday, 1991), Permian marine limestones (Jones et al, 1995), Cambrian calcite concretions (Israelson et al, 1996), Paleozoic and Mesozoic soil calcite (Rasbury et al, 1997Wang et al, 1998), Cretaceous cave spar (Lundberg et al, 2000), calcite associated with Permian evaporite deposits (Becker et al, 2002), and late Paleozoic altered marine aragonite cement . The success of these studies has prompted others to investigate the U-Pb systematics of Cenozoic near-surface deposits including organic-rich peat (Rowe et al, 1997), speleothem calcite (Richards et al, 1998), secondary silica (Neymark et al, 2000(Neymark et al, , 2002, and coral aragonite (Getty et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Using U-Pb ages of Miocene tufa for correlation in a terrestrial succession, Barstow Formation, California

Cole

Rasbury

Hanson

et al. 2005

Geol Soc America Bull

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Sedimentary rocks and associated fossils are the direct record of past life and its environmental context. Few methods allow direct and precise dating of this important archive, making it diffi cult to correlate climate, biologic, and tectonic events preserved in terrestrial records. We sampled lacustrine tufa calcite from the middle member of the Miocene Barstow Formation to further test the feasibility of uranium-lead dating of terrestrial carbonates. Five samples yield U-Pb ages (2σ) of 14.81 ± 0.39 Ma, 15.30 ± 0.25 Ma, 15.39 ± 0.15 Ma, 16.14 ± 0.40 Ma, and 16.24 ± 0.23 Ma. These precise ages are consistent with existing ages from K-Ar and 40 Ar/ 39 Ar dating of intercalated volcanic ashes. Our most precise U-Pb age on tufa has an uncertainty of <1% (150 ka), which is equivalent to uncertainties for K-Ar ages from the same time period. Our results indicate that U-Pb dating of carefully sampled and screened sedimentary carbonates provides much needed age constraints in purely terrestrial sequences and can be a powerful tool for correlation even in deposits with structural complexity and rapid facies changes.

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Direct radiometric age determination of carbonate diagenesis using U-Pb in secondary calcite

Cited by 58 publications

References 21 publications

Alpha thermochronology of carbonates

Alpha thermochronology of carbonates

An Image Mapping Approach to U‐Pb LA‐ICP‐MS Carbonate Dating and Applications to Direct Dating of Carbonate Sedimentation

Using U-Pb ages of Miocene tufa for correlation in a terrestrial succession, Barstow Formation, California

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