NDLI: Significance of the sm-nd isotopic systematics of the akilia association

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Significance of the sm-nd isotopic systematics of the akilia association

Content Provider	NASA Technical Reports Server (NTRS)
Author	Nutman, A. Jahn, B. M. Gruau, G.
Copyright Year	1986
Description	Samarium-Neodymium analyses were carried out on fourteen samples of basic to ultrabasic metavolcanics from several enclaves of the Amitsoq gneisses (T = to or approximately 3,700 Ma). Field observations suggest that all the analyzed rocks belong to the pre-Amitsoq Akilia Association. Consequently, a minimum age of 3,700 Ma is postulated for the emplacement of their protoliths. When all the data points are put together in a conventional isochron diagram, no clear isochron relationship can be discerned. However, the points seem to fall within a band broadly corresponding to an age of 3,600 Ma. The isotopic results are difficult to interpret satisfactorily. Two contrasting interpretations are offered and summarized: (1) data scatter as a result of open system behavior; and (2) data scatter due to a melange of data sets defining two distinct isochrons.
File Size	159071
Page Count	4
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19860019073
Archival Resource Key	ark:/13960/t94798n3m
Language	English
Publisher Date	1986-01-01
Access Restriction	Open
Subject Keyword	Geophysics Metamorphic Rocks Petrology Earth Mantle Lithology Radioactive Isotopes Radiochemistry Volcanology Metamorphism Geology Chronology Tectonics Gneiss Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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