207Pb-excess in carbonatitic baddeleyite as the result of Pa scavenging from the melt
| العنوان: | 207Pb-excess in carbonatitic baddeleyite as the result of Pa scavenging from the melt |
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| المؤلفون: | A.E. Marfin, F. Corfu, A.V. Ivanov, V.S. Kamenetsky, N.V. Vladykin |
| المصدر: | Geochemical Perspectives Letters. 18:11-15 |
| بيانات النشر: | European Association of Geochemistry, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Geochemistry and Petrology, Chemistry, Environmental Chemistry, Geology, Scavenging, Baddeleyite, Nuclear chemistry |
| الوصف: | For the last two decades, the end of the voluminous phase of eruptions of the Siberian Traps large igneous province has been constrained by a U-Pb date of discordant baddeleyite collected from the Guli carbonatite intrusion with the assumption that the discordance resulted from unsupported 207Pb. In this study we have re-analysed baddeleyite from the same intrusion and found two types of discordance: (1) due to 207Pb-excess, and (2) radiogenic lead loss from high U mineral inclusions. The former implies that baddeleyite is an efficient scavenger of protactinium during crystallisation, leaving the magma depleted in this element. Together with a published high precision U-Pb date of 252.24 ± 0.08 Ma for the Arydzhansky Formation, our new date of 250.33 ± 0.38 Ma for the Guli carbonatite constrains the total duration of the voluminous eruptions of the Siberian Traps LIP at 1.91 ± 0.38 million years. The lower intercept of the (231Pa)/(235U) corrected discordance line yields a date of 129.2 ± 65.0 Ma, which points to the widespread Early Cretaceous rifting in East and Central Asia. |
| تدمد: | 2410-3403 2410-339X |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::123afb2c4ea314c1a0c4b8cde5320726 https://doi.org/10.7185/geochemlet.2117 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....123afb2c4ea314c1a0c4b8cde5320726 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24103403 2410339X |
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