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Differentiated impact melt sheets may be a potential source of Hadean detrital zircon.
Swedish Museum of Natural History, Department of Geology. (Nordsim)
Swedish Museum of Natural History, Department of Geology. (Nordsim)ORCID iD: 0000-0003-2227-577X
2016 (English)In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, Vol. 44, 431-434 p.Article in journal (Refereed) Published
Abstract [en]

Constraining the origin and history of very ancient detrital zircons has unique potential for furthering our knowledge of Earth’s very early crust and Hadean geodynamics. Previous applications of the Ti-in-zircon thermometer to >4 Ga zircons have identified a population with relatively low crystallization temperatures () of ~685 °C. This could possibly indicate wet minimum-melting conditions producing granitic melts, implying very different Hadean terrestrial geology from other rocky planets. Here we report the first comprehensive ion microprobe study of zircons from a transect through the differentiated Sudbury impact melt sheet. The new zircon Ti contents and corresponding  fully overlap with those of the Hadean zircon population. Previous studies, which measured Ti in impact melt sheet zircons did not find this wide range because they analyzed samples only from a restricted portion of the melt sheet and because they used laser ablation analyses that can overestimate true Ti content. It is important to note that internal differentiation of the impact melt is likely a prerequisite for the observed low  in zircons from the most evolved rocks. On Earth, melt sheet

Place, publisher, year, edition, pages
2016. Vol. 44, 431-434 p.
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-1927DOI: 10.1130/G37898.1OAI: oai:DiVA.org:nrm-1927DiVA: diva2:1049517
Available from: 2016-11-24 Created: 2016-11-24 Last updated: 2017-04-13Bibliographically approved

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Publisher's full texthttp://geology.gsapubs.org/content/early/2016/04/27/G37898.1.

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