Ngo, Henry H. and Wasserburg, Gerald J. and Glass, Billy P. (1985) Nd and Sr isotopic compositions of tektite material from Barbados and their relationship to North American tektites. Geochimica et Cosmochimica Acta, 49 (6). pp. 1479-1485. ISSN 0016-7037. doi:10.1016/0016-7037(85)90297-2. https://resolver.caltech.edu/CaltechAUTHORS:20130924-101654119
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Abstract
Isotopic analyses of Nd and Sr on individual microtektites and a bulk microtektite sample from Barbados show them to have a very well defined isotopic composition. These data plot on an ε_(Sr)ε_(Nd) diagram precisely within the narrow field determined by North American tektites (ε_(Sr) ≈ 111; ε_(Nd) ≈ −6.2). They yield an Nd model age of 0.6 AE. These results show that the microtektites from the Oceanic beds of late Eocene age are derived from the same target as the North American tektites and should be associated with the same event. Samples of the deep sea sediments in which the Barbados microtektites occur are found to have isotopic signatures which appear to reflect ambient sea water and detrital sediments. They cannot be the source of Sr or Nd in the tektites. Following the arguments of SHAW and WASSERBURG (1982) we conclude that the target area which produced the North American tektite field was composed of sediments (Eocambrian or younger) derived from very late Precambrian crust. Glass beads from Lake Wanapitei Crater are isotopically different from all other tektites (ε_(Sr) ≈ 960; ε_(Nd) ≈ −31.4) and cannot be related to the North American tektites.
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| Additional Information: | © 1985 Pergamon Press Ltd. Received December 12, 1984; accepted in revised form March 21, 1985. We thank H. F. Shaw, A. Montanan and an anonymous reviewer for their comments and suggestions and D. A. Papanastassiou for his generous aid in the operation of the mass spectrometer. This work was supported by the National Aeronautics and Space Administration (Grant NAG 9-43) and the National Science Foundation (Grants OCE 83-20516 and EAR 83-12882). | |||||||||
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| Issue or Number: | 6 | |||||||||
| DOI: | 10.1016/0016-7037(85)90297-2 | |||||||||
| Record Number: | CaltechAUTHORS:20130924-101654119 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130924-101654119 | |||||||||
| Official Citation: | Henry H. Ngo, Gerald J. Wasserburg, Billy P. Glass, Nd and Sr isotopic compositions of tektite material from Barbados and their relationship to North American tektites, Geochimica et Cosmochimica Acta, Volume 49, Issue 6, June 1985, Pages 1479-1485, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(85)90297-2. (http://www.sciencedirect.com/science/article/pii/0016703785902972) | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 41497 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 24 Sep 2013 18:12 | |||||||||
| Last Modified: | 10 Nov 2021 04:30 |
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