U-Pb dating by zircon dissolution method using chemical abrasion
نویسندگان
چکیده
منابع مشابه
Zircon U–Pb chemical abrasion (bCA-TIMSQ) method: Combined annealing and multi-step partial dissolution analysis for improved precision and accuracy of zircon ages
A long-standing goal in high-precision and high-accuracy U–Pb zircon geochronology is the total elimination of discordance caused by Pb loss. In theory, this is fairly straightforward, but in reality it has proven extremely difficult to attain (or even demonstrate attainment of) this goal. However, a new method, bCA (Chemical Abrasion)-TIMSQ, is capable of completely removing zircon domains tha...
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Zircon (ZrSiO4) is the most commonly used mineral in U–Pb geochronology. Although it has proven to be a robust chronometer, it can suffer from Pb-loss or elevated common Pb, both of which impede precision and accuracy of age determinations. Chemical abrasion of zircon involves thermal annealing followed by relatively low temperature partial dissolution in HF acid. It was specifically developed ...
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The Erongo subvolcanic center in Namibia is the largest composite, bimodal complex in the Mesozoic Etendeka igneous province of Namibia. This study of 40Ar/39Ar and high spatial resolution U^Pb zircon dating demonstrates that emplacement of the various igneous units at Erongo took place within a time span equivalent to or shorter than geochronologically resolvable age differences (ca. 2 Ma), an...
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ژورنال
عنوان ژورنال: Anais da Academia Brasileira de Ciências
سال: 2012
ISSN: 0001-3765
DOI: 10.1590/s0001-37652012000200011