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O¹⁸/O¹⁶ Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland

Taylor, H. P., Jr. and Epstein, S. (1963) O¹⁸/O¹⁶ Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland. Journal of Petrology, 4 (1). pp. 51-74. ISSN 0022-3530. doi:10.1093/petrology/4.1.51. https://resolver.caltech.edu/CaltechAUTHORS:20221014-342855600.2

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Abstract

The Skaergaard intrusion of East Greenland is a gravitationally stratified gabbroic mass that has undergone extreme fractional crystallization. Oxygen-isotopic analyses have been obtained for the various rock types of this intrusion and for several coexisting minerals of these rocks. The general relationships among the O18/O16 ratios of the minerals are the same as have been found for other igneous rocks, but the isotopic fracticnations are smaller, probably as a result of the higher temperature of formation of the Skaergaard rocks. The later differentiates are progressively depleted in O18 to a marked degree relative to the earlier-formed portions of the layered series; the late-stage granophyres are 4–5 per mil lower in O18/O16 than the layered Lower Zone gabbros, and are 7–9 per mil lower than normal granitic rocks from other localities. This progressive depletion in O18 is a result of crystallization and settling out of minerals that are, on the whole, about 1 per mil higher in O18/O16 than the magma liquid. Calculations based on a simple crystallization model are in agreement with the experimental results.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/petrology/4.1.51DOIArticle
Alternate Title:O 18 /O 16 Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland
Issue or Number:1
DOI:10.1093/petrology/4.1.51
Record Number:CaltechAUTHORS:20221014-342855600.2
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20221014-342855600.2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117421
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Oct 2022 20:47
Last Modified:17 Oct 2022 20:47

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