O18/O16 Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland
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 rel...
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fthighwire:oai:open-archive.highwire.org:petrology:4/1/51 2023-05-15T16:03:36+02:00 O18/O16 Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland TAYLOR, H. P. EPSTEIN, S. 1963-01-01 00:00:00.0 text/html http://petrology.oxfordjournals.org/cgi/content/short/4/1/51 https://doi.org/10.1093/petrology/4.1.51 en eng Oxford University Press http://petrology.oxfordjournals.org/cgi/content/short/4/1/51 http://dx.doi.org/10.1093/petrology/4.1.51 Copyright (C) 1963, Oxford University Press Articles TEXT 1963 fthighwire https://doi.org/10.1093/petrology/4.1.51 2015-02-28T21:35:20Z 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. Text East Greenland Greenland HighWire Press (Stanford University) Greenland Journal of Petrology 4 1 51 74 |
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Articles TAYLOR, H. P. EPSTEIN, S. O18/O16 Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland |
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description |
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. |
format |
Text |
author |
TAYLOR, H. P. EPSTEIN, S. |
author_facet |
TAYLOR, H. P. EPSTEIN, S. |
author_sort |
TAYLOR, H. P. |
title |
O18/O16 Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland |
title_short |
O18/O16 Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland |
title_full |
O18/O16 Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland |
title_fullStr |
O18/O16 Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland |
title_full_unstemmed |
O18/O16 Ratios in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland |
title_sort |
o18/o16 ratios in rocks and coexisting minerals of the skaergaard intrusion, east greenland |
publisher |
Oxford University Press |
publishDate |
1963 |
url |
http://petrology.oxfordjournals.org/cgi/content/short/4/1/51 https://doi.org/10.1093/petrology/4.1.51 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_relation |
http://petrology.oxfordjournals.org/cgi/content/short/4/1/51 http://dx.doi.org/10.1093/petrology/4.1.51 |
op_rights |
Copyright (C) 1963, Oxford University Press |
op_doi |
https://doi.org/10.1093/petrology/4.1.51 |
container_title |
Journal of Petrology |
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4 |
container_issue |
1 |
container_start_page |
51 |
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74 |
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1766399292692496384 |