CaltechAUTHORS
  A Caltech Library Service

O¹⁸/O¹⁶ and C¹³/C¹² Ratios of Coexisting Minerals in the Oka and Magnet Cove Carbonatite Bodies

Conway, Clay M. and Taylor, Hugh P., Jr. (1969) O¹⁸/O¹⁶ and C¹³/C¹² Ratios of Coexisting Minerals in the Oka and Magnet Cove Carbonatite Bodies. Journal of Geology, 77 (5). pp. 618-626. ISSN 0022-1376. https://resolver.caltech.edu/CaltechAUTHORS:20221101-222709625

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20221101-222709625

Abstract

Oxygen isotope analyses were obtained for five magnetites (δ = +1.1 to +2.9), three biotites (+4.2 to +5.2), two melilites (+4.7 to +5.2), one apatite (+5.6), one niocalite (+4.2) and one pyrochlore (+1.2) from five samples of okaite and carbonatite in the Oka, Quebec, and Magnet Cove, Arkansas, complexes. Calcites from these and three other samples were analyzed for both O¹⁸/O¹⁶ and C¹³/C¹² (δO¹⁸ = +6.6 to +7.6, δC¹³ = -5.8 to -5.2). The order of increasing O¹⁸ concentration among minerals is consistent in all samples. Calculated whole-rock δO¹⁸ values (+4.7 to +5.9) are similar to those of mafic and ultramafic igneous rocks, and the δO¹⁸ and δC¹³ values of the calcites fall within the range previously suggested as being characteristic of primary igneous carbonatites. Crystallization temperatures, calculated from O¹⁸ fractionations for the pair calcite-magnetite, demonstrate that the okaites and carbonatites crystallized at about the same temperatures as, respectively, gabbros and "granitic" igneous rocks.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://www.jstor.org/stable/30062255JSTORArticle
Alternate Title:O18/O16 and C13/C12 Ratios of Coexisting Minerals in the Oka and Magnet Cove Carbonatite Bodies
Additional Information:Appreciation is expressed to P. Yanagisawa for performing some of the fluorine extractions of oxygen, and to G. J. Wasserburg, M. Bass, A. R. Philpotts and A. E. Bence for supplying samples. Financial support for this research was provided by the National Science Foundation, grant no. GA 992.
Funders:
Funding AgencyGrant Number
NSFGA 992
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological Sciences1601
Issue or Number:5
Record Number:CaltechAUTHORS:20221101-222709625
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20221101-222709625
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117681
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Nov 2022 00:07
Last Modified:04 Nov 2022 00:07

Repository Staff Only: item control page