Osmium isotope compositions of detrital Os-rich alloys from the Rhine River provide evidence for a global late Mesoproterozoic mantle depletion event
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- 作者：Arjan H. Dijkstraa ; dijkstra@plymouth.ac.uk" class="auth_mail" title="E-mail the corresponding author ; Christopher W. Daleb ; Thomas Oberthü ; rc ; Geoffrey M. Nowellb ; D. Graham Pearsonb ; d
- 关键词：geodynamics ; mantle melting ; Ru&ndash ; Os&ndash ; Ir alloys ; isotope geochemistry ; mesoproterozoic
- 刊名：Earth and Planetary Science Letters
- 出版年：2016
- 出版时间：15 October 2016
- 年：2016
- 卷：452
- 期：Complete
- 页码：115-122
- 全文大小：1711 K
文摘
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We report osmium isotope compositions of 297 mantle-derived Ru–Os–Ir alloys from the River Rhine.
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The alloys record two mantle melting events: one at ∼500 Ma and one at 1.0–1.2 Ga.
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The local geology cannot explain Late Mesoproterozoic mantle melting.
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The late Mesoproterozoic peak coincides with a global peak in zircon crystallization.
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Global mantle melting in the late Mesoproterozoic is linked to supercontinent cycle.