Baddeleyite Dating

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Feasibility of chemical U-Th-total Pb baddeleyite dating . . .
GChron - Multimethod U-Pb baddeleyite dating: insights . . .
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The mineral baddeleyite (ZrO 2) is a U-bearing accessory phase that occurs in many mafic and ultramafic rocks, and has been used extensively for U-Pb dating of mafic magmatic events (e .g ., Krogh et al ., 1987, Heaman and LeCheminant, 1993 ) . Baddeleyite is an ideal geochronometer for mafic igneous rocks because it has relatively high . . .
Baddeleyite , a monoclinic ZrO 2 polymorph, is one of the most commonly used minerals in U-Pb geochronology, especially for mafic rocks, which are traditionally difficult to date (e .g ., Schaltegger and Davies, 2017) . It forms most readily during the late stage of igneous crystallization from a silica-undersaturated residual melt and can coexist with zircon at conditions near silica saturation . . .
Baddeleyite has long been recognized as one of the most important U-bearing minerals for dating silica undersaturated igneous rocks . Age determination of baddeleyite calls for analysis within small volumes using high-resolution secondary ion mass spectrometry (SIMS) because of its minuscule grain size as well as potential altered domains or micro-inclusions .
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dating silica undersaturated igneous rocks, there are limited numbers of U-Pb and/or Pb-Pb baddeleyite ages in the literature due to some difficulties that hamper the dating of baddeleyite . Baddeleyite usually occurs in very low abundance and minute crystal size (often <30 mm in width) . Thus, separation of bad-
Larsson, E ., 2015: U-Pb baddeleyite dating of intrusions in th south-easternmost Kaapvaal Craton (South Africa): revealing multiple events of dyke emplacement . Dissertations in Geology at Lund University, No . 457, 30 pp . 45 hp (45 ECTS credits) . Keywords: U-Pb, baddeleyite , Kaapvaal Craton, mafic dykes, geochronology
The paper is devoted to the history of the discovery, petrological and mineralogical characterization, and U-Pb dating of baddeleyite ZrO 2, which was separated from various Archean, Proterozoic, and Paleozoic rocks from Fennoscandia .The morphology of this mineral and its U-Pb age values were examined in the Archean carbonatites (2613 ± 18 Ma) of Siilinjarvi, Finland, and gabbronorite dikes . . .
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Baddeleyite is a frequently found accessory mineral in silica undersaturated lavas . Because it is typi - cally enriched in uranium, while having low initial lead, baddeleyite has long been a prime target for U-Pb geochronology of mafic rocks . The difficulties in retrieving small baddeleyite grains from volcanic
Baddeleyite is a common mineral in mafic igneous rocks and can be used for U-Pb geochronology . However, this mineral remains under-utilized in geochronologic studies due to several issues . I have been working to improve techniques for dating baddeleyite in collaboration with Mike Eddy (Purdue U .) and Joel DesOrmeau (University of Nevada Reno) .
First SIMS U-Pb dating for Apollo norite 78238 is performed by 5 μm primary beam . • A baddeleyite grain in 78238 has a 207 Pb/ 206 Pb crystallization age of 4332 ± 18 Ma . . The 207 Pb/ 206 Pb age of 78238 is resolvably younger than the age of ferroan anorthosite 60025 . . The 207 Pb/ 206 Pb age supports a pulse of the Mg-suite magmatism at ∼4330 Ma .
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Baddeleyite Dating

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