Krishnaswami, S. ; Turekian, K. K. ; Bennett, J. T. (1984) The behavior of 232Th and the 238U decay chain nuclides during magma formation and volcanism Geochimica et Cosmochimica Acta, 48 (3). pp. 505-511. ISSN 0016-7037
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/001670...
Related URL: http://dx.doi.org/10.1016/0016-7037(84)90278-3
Abstract
Concentrations of the members of the 238U decay chain and 232Th were determined in volcanic rocks from convergent plate margins, intraplate volcanoes and oceanic spreading centers. Contemporary and historical volcanic rocks from Mt. St. Helens, Arenal, El Chichon, Hawaii and Iceland and submarine basaltic glass from the Galapagos spreading center all show no fractionation of U and Th in the mantle source or during magma formation at least for the past 300,000 years. Mauna Kea (Hawaii) rocks of alkaline composition greater than 4000 years old and an old submarine basalt show disequilibrium for several of the nuclides in the 238U decay chain. We interpret these as resulting from post-emplacement processes.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 16764 |
| Deposited On: | 15 Nov 2010 13:19 |
| Last Modified: | 04 Jun 2011 08:13 |
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