Single mineral PbPb dating
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Cited by (139)
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2020, Geochimica et Cosmochimica ActaCitation Excerpt :The separated chondrules were processed for Pb isotopic analysis under clean laboratory conditions at the Ecole Normale Supérieure in Lyon (ENS Lyon). Because aggressive acid step leaching is known to achieve efficient separation of radiogenic and initial Pb (Frei and Kamber, 1995), after weighing each individual chondrule, or pool of multiple chondrules, into new, pre-cleaned Savillex beakers, they were leached successively in double-distilled hot 1 M HBr, hot 6 M HCl, and hot concentrated HNO3, each acid a single 1 hour leach session at 120 °C interspersed with ultrasonication steps and clean (18.2 MΩ cm−1) water rinses, then dissolved in a 3:1:0.5 mixture of double-distilled concentrated HF:HNO3:HClO4. All residue and leachate fractions were run individually through 0.25 ml anion-exchange chromatographic columns to separate Pb (collected with double-distilled 6 M HCl after elution of the sample matrix with double-distilled 1 M HBr), which was analyzed for its isotopic composition by MC-ICP-MS, also at ENS Lyon.
The promise and potential pitfalls of acid leaching for Pb[sbnd]Pb chronology
2019, Chemical Geology