Typology, evolution, and origin of the Kerguelen Plutonic Series, Indian Ocean: A review

Abstract The Kerguelen Islands (6,500 km 2 ) are the third largest oceanic archipelago after Iceland and Hawaii. One of their most remarkable geological features is the existence of several igneous complexes thought to represent the deep levels of volcano‐plutonic structures of which the upper part...

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Published in:Geological Journal
Main Author: Giret, André
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 1990
Subjects:
Online Access:http://dx.doi.org/10.1002/gj.3350250307
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spelling crwiley:10.1002/gj.3350250307 2024-09-15T18:14:04+00:00 Typology, evolution, and origin of the Kerguelen Plutonic Series, Indian Ocean: A review Giret, André 1990 http://dx.doi.org/10.1002/gj.3350250307 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fgj.3350250307 https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.3350250307 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geological Journal volume 25, issue 3-4, page 239-247 ISSN 0072-1050 1099-1034 journal-article 1990 crwiley https://doi.org/10.1002/gj.3350250307 2024-07-25T04:20:18Z Abstract The Kerguelen Islands (6,500 km 2 ) are the third largest oceanic archipelago after Iceland and Hawaii. One of their most remarkable geological features is the existence of several igneous complexes thought to represent the deep levels of volcano‐plutonic structures of which the upper part has been eroded. These plutonic bodies have ring shapes with diameters ranging from 1 to 15 km. The oldest (39–23 Ma) have transitional petrological features while the youngest (26 Ma–Recent) are typically alkaline. This sequence is also observed in the surrounding flood‐basalts. Both the basalts and the plutonic rocks have a mantle origin. The alkaline plutonic suites evolve towards silica‐over or undersaturated rock types depending on whether they are located to the west or to the east of a NNW–SSE boundary. The divergence in alkaline trends may be related to magmatic differentiation or linked to the evolution of two different initial magmas, one being mid‐alkaline and the other high‐alkaline. In both hypotheses fluids, particularly H 2 O, play a major role. Article in Journal/Newspaper Iceland Kerguelen Islands Wiley Online Library Geological Journal 25 3-4 239 247
institution Open Polar
collection Wiley Online Library
op_collection_id crwiley
language English
description Abstract The Kerguelen Islands (6,500 km 2 ) are the third largest oceanic archipelago after Iceland and Hawaii. One of their most remarkable geological features is the existence of several igneous complexes thought to represent the deep levels of volcano‐plutonic structures of which the upper part has been eroded. These plutonic bodies have ring shapes with diameters ranging from 1 to 15 km. The oldest (39–23 Ma) have transitional petrological features while the youngest (26 Ma–Recent) are typically alkaline. This sequence is also observed in the surrounding flood‐basalts. Both the basalts and the plutonic rocks have a mantle origin. The alkaline plutonic suites evolve towards silica‐over or undersaturated rock types depending on whether they are located to the west or to the east of a NNW–SSE boundary. The divergence in alkaline trends may be related to magmatic differentiation or linked to the evolution of two different initial magmas, one being mid‐alkaline and the other high‐alkaline. In both hypotheses fluids, particularly H 2 O, play a major role.
format Article in Journal/Newspaper
author Giret, André
spellingShingle Giret, André
Typology, evolution, and origin of the Kerguelen Plutonic Series, Indian Ocean: A review
author_facet Giret, André
author_sort Giret, André
title Typology, evolution, and origin of the Kerguelen Plutonic Series, Indian Ocean: A review
title_short Typology, evolution, and origin of the Kerguelen Plutonic Series, Indian Ocean: A review
title_full Typology, evolution, and origin of the Kerguelen Plutonic Series, Indian Ocean: A review
title_fullStr Typology, evolution, and origin of the Kerguelen Plutonic Series, Indian Ocean: A review
title_full_unstemmed Typology, evolution, and origin of the Kerguelen Plutonic Series, Indian Ocean: A review
title_sort typology, evolution, and origin of the kerguelen plutonic series, indian ocean: a review
publisher Wiley
publishDate 1990
url http://dx.doi.org/10.1002/gj.3350250307
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fgj.3350250307
https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.3350250307
genre Iceland
Kerguelen Islands
genre_facet Iceland
Kerguelen Islands
op_source Geological Journal
volume 25, issue 3-4, page 239-247
ISSN 0072-1050 1099-1034
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op_doi https://doi.org/10.1002/gj.3350250307
container_title Geological Journal
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