Science (American Association for the Advancement of Science), 2008-09, Vol.321 (5897), p.1828-1831
2008
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Details
- Autor(en) / Beteiligte
- Titel
- Neodymium-142 Evidence for Hadean Mafic Crust
- Ist Teil von
- Science (American Association for the Advancement of Science), 2008-09, Vol.321 (5897), p.1828-1831
- Ort / Verlag
- Washington, DC: American Association for the Advancement of Science
- Erscheinungsjahr
- 2008
- Quelle
- Science Online_科学在线
- Beschreibungen/Notizen
- Neodymium-142 data for rocks from the Nuvvuagittuq greenstone belt in northern Quebec, Canada, show that some rock types have lower ¹⁴²Nd/¹⁴⁴Nd ratios than the terrestrial standard (ε¹⁴²Nd = -0.07 to -0.15). Within a mafic amphibolite unit, ¹⁴²Nd/¹⁴⁴Nd ratios correlate positively with Sm/Nd ratios and produce a ¹⁴⁶Sm-¹⁴²Nd isochron with an age of [Formula: see text] million years. These rocks thus sample incompatible-element-enriched material formed shortly after Earth formation and may represent the oldest preserved crustal section on Earth.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0036-8075eISSN: 1095-9203DOI: 10.1126/science.1161925Titel-ID: cdi_proquest_miscellaneous_743322475
- Format
- –
- Schlagworte
- Age, Biotite, Crystalline rocks, Earth, Earth sciences, Earth, ocean, space, Error rates, Exact sciences and technology, Gabbro, Garnets, Geological time, Geology, Igneous and metamorphic rocks petrology, volcanic processes, magmas, Isotope geochemistry, Isotope geochemistry. Geochronology, Isotopes, Mantle, Mineralogy, Rocks, Synforms