Extensive Volcanism Associated with the Separation of Australia and Antarctica
Alternating hard and soft layers characterize the Gull Rock and Tuit Members of the late Eocene Blanche Point Formation, South Australia. Originally the formation was mainly a mixture of volcanic ash, sponge spicules, and calcareous fossil remains, with hard layers produced later by selective silici...
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American Association for the Advancement of Science (AAAS)
1984
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Online Access: | http://dx.doi.org/10.1126/science.226.4672.346 https://www.science.org/doi/pdf/10.1126/science.226.4672.346 |
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craaas:10.1126/science.226.4672.346 2024-06-09T07:38:55+00:00 Extensive Volcanism Associated with the Separation of Australia and Antarctica Jones, J. B. Fitzgerald, M. J. 1984 http://dx.doi.org/10.1126/science.226.4672.346 https://www.science.org/doi/pdf/10.1126/science.226.4672.346 en eng American Association for the Advancement of Science (AAAS) Science volume 226, issue 4672, page 346-348 ISSN 0036-8075 1095-9203 journal-article 1984 craaas https://doi.org/10.1126/science.226.4672.346 2024-05-16T12:55:24Z Alternating hard and soft layers characterize the Gull Rock and Tuit Members of the late Eocene Blanche Point Formation, South Australia. Originally the formation was mainly a mixture of volcanic ash, sponge spicules, and calcareous fossil remains, with hard layers produced later by selective silicification. It resembles Cretaceous sediments from western Europe and the eastern coast of the United States, and in each case it appears that alteration of volcanic ash produced smectite and clinoptilolite with release of silica that subsequently crystallized as opal-CT. The occurrence of similar deposits from New Zealand to as far west as Albany, Western Australia, indicates extensive volcanic activity south of Australia in the late Eocene resulting from rifting and separation from Antarctica. Article in Journal/Newspaper Antarc* Antarctica AAAS Resource Center (American Association for the Advancement of Science) Blanche ENVELOPE(140.018,140.018,-66.663,-66.663) Blanche Point ENVELOPE(-55.731,-55.731,49.933,49.933) Gull Rock ENVELOPE(-56.054,-56.054,-63.136,-63.136) New Zealand Science 226 4672 346 348 |
institution |
Open Polar |
collection |
AAAS Resource Center (American Association for the Advancement of Science) |
op_collection_id |
craaas |
language |
English |
description |
Alternating hard and soft layers characterize the Gull Rock and Tuit Members of the late Eocene Blanche Point Formation, South Australia. Originally the formation was mainly a mixture of volcanic ash, sponge spicules, and calcareous fossil remains, with hard layers produced later by selective silicification. It resembles Cretaceous sediments from western Europe and the eastern coast of the United States, and in each case it appears that alteration of volcanic ash produced smectite and clinoptilolite with release of silica that subsequently crystallized as opal-CT. The occurrence of similar deposits from New Zealand to as far west as Albany, Western Australia, indicates extensive volcanic activity south of Australia in the late Eocene resulting from rifting and separation from Antarctica. |
format |
Article in Journal/Newspaper |
author |
Jones, J. B. Fitzgerald, M. J. |
spellingShingle |
Jones, J. B. Fitzgerald, M. J. Extensive Volcanism Associated with the Separation of Australia and Antarctica |
author_facet |
Jones, J. B. Fitzgerald, M. J. |
author_sort |
Jones, J. B. |
title |
Extensive Volcanism Associated with the Separation of Australia and Antarctica |
title_short |
Extensive Volcanism Associated with the Separation of Australia and Antarctica |
title_full |
Extensive Volcanism Associated with the Separation of Australia and Antarctica |
title_fullStr |
Extensive Volcanism Associated with the Separation of Australia and Antarctica |
title_full_unstemmed |
Extensive Volcanism Associated with the Separation of Australia and Antarctica |
title_sort |
extensive volcanism associated with the separation of australia and antarctica |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
1984 |
url |
http://dx.doi.org/10.1126/science.226.4672.346 https://www.science.org/doi/pdf/10.1126/science.226.4672.346 |
long_lat |
ENVELOPE(140.018,140.018,-66.663,-66.663) ENVELOPE(-55.731,-55.731,49.933,49.933) ENVELOPE(-56.054,-56.054,-63.136,-63.136) |
geographic |
Blanche Blanche Point Gull Rock New Zealand |
geographic_facet |
Blanche Blanche Point Gull Rock New Zealand |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Science volume 226, issue 4672, page 346-348 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.226.4672.346 |
container_title |
Science |
container_volume |
226 |
container_issue |
4672 |
container_start_page |
346 |
op_container_end_page |
348 |
_version_ |
1801376108415811584 |