Jurassic titaniferous ironstone in a Devonian host: Pivot Coal Measures expunged
The Devonian, Pivot Coal Measures in southern Victoria Land are non-carbonaceous. The sequence contains bedding parallel, titaniferous ironstones up to 50 cm thick, but no coal or carbonaceous shale, the unit is consequently renamed Pivot Member of the Arena Sandstone. The more Fe-Ti oxide-rich (up...
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Cambridge University Press (CUP)
1995
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Online Access: | http://dx.doi.org/10.1017/s095410209500040x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410209500040X |
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crcambridgeupr:10.1017/s095410209500040x 2024-09-09T19:12:37+00:00 Jurassic titaniferous ironstone in a Devonian host: Pivot Coal Measures expunged Woolfe, Ken J. Arnot, Malcolm J. Bradley, Graham M. 1995 http://dx.doi.org/10.1017/s095410209500040x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410209500040X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 7, issue 3, page 293-301 ISSN 0954-1020 1365-2079 journal-article 1995 crcambridgeupr https://doi.org/10.1017/s095410209500040x 2024-06-19T04:02:46Z The Devonian, Pivot Coal Measures in southern Victoria Land are non-carbonaceous. The sequence contains bedding parallel, titaniferous ironstones up to 50 cm thick, but no coal or carbonaceous shale, the unit is consequently renamed Pivot Member of the Arena Sandstone. The more Fe-Ti oxide-rich (up to 40 modal %) beds appear black and coal-like with conchoidal fracture and closely spaced cleat-like fractures. The coal-like beds grade laterally and vertically into less altered sedimentary rocks in which fine bedding-parallel concentrations of Fe-Ti oxide pick-out parting surfaces on ripples and other sedimentary structures. Thin section petrography shows that the Fe-Ti oxide is replacive, and outcrop relationships show that the replacement was related to dolerite intrusion 200 million years after the sedimentary host was deposited. Replacement of muscovite, biotite and chlorite by Fe-Ti-oxide occurred at 179 ± 3 Ma, at pressures of 0.3–0.4 kbar and at temperatures as low as 380°C. Article in Journal/Newspaper Antarctic Science Victoria Land Cambridge University Press Pivot ENVELOPE(-30.239,-30.239,-80.667,-80.667) Victoria Land Antarctic Science 7 3 293 301 |
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Open Polar |
collection |
Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
The Devonian, Pivot Coal Measures in southern Victoria Land are non-carbonaceous. The sequence contains bedding parallel, titaniferous ironstones up to 50 cm thick, but no coal or carbonaceous shale, the unit is consequently renamed Pivot Member of the Arena Sandstone. The more Fe-Ti oxide-rich (up to 40 modal %) beds appear black and coal-like with conchoidal fracture and closely spaced cleat-like fractures. The coal-like beds grade laterally and vertically into less altered sedimentary rocks in which fine bedding-parallel concentrations of Fe-Ti oxide pick-out parting surfaces on ripples and other sedimentary structures. Thin section petrography shows that the Fe-Ti oxide is replacive, and outcrop relationships show that the replacement was related to dolerite intrusion 200 million years after the sedimentary host was deposited. Replacement of muscovite, biotite and chlorite by Fe-Ti-oxide occurred at 179 ± 3 Ma, at pressures of 0.3–0.4 kbar and at temperatures as low as 380°C. |
format |
Article in Journal/Newspaper |
author |
Woolfe, Ken J. Arnot, Malcolm J. Bradley, Graham M. |
spellingShingle |
Woolfe, Ken J. Arnot, Malcolm J. Bradley, Graham M. Jurassic titaniferous ironstone in a Devonian host: Pivot Coal Measures expunged |
author_facet |
Woolfe, Ken J. Arnot, Malcolm J. Bradley, Graham M. |
author_sort |
Woolfe, Ken J. |
title |
Jurassic titaniferous ironstone in a Devonian host: Pivot Coal Measures expunged |
title_short |
Jurassic titaniferous ironstone in a Devonian host: Pivot Coal Measures expunged |
title_full |
Jurassic titaniferous ironstone in a Devonian host: Pivot Coal Measures expunged |
title_fullStr |
Jurassic titaniferous ironstone in a Devonian host: Pivot Coal Measures expunged |
title_full_unstemmed |
Jurassic titaniferous ironstone in a Devonian host: Pivot Coal Measures expunged |
title_sort |
jurassic titaniferous ironstone in a devonian host: pivot coal measures expunged |
publisher |
Cambridge University Press (CUP) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1017/s095410209500040x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410209500040X |
long_lat |
ENVELOPE(-30.239,-30.239,-80.667,-80.667) |
geographic |
Pivot Victoria Land |
geographic_facet |
Pivot Victoria Land |
genre |
Antarctic Science Victoria Land |
genre_facet |
Antarctic Science Victoria Land |
op_source |
Antarctic Science volume 7, issue 3, page 293-301 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s095410209500040x |
container_title |
Antarctic Science |
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7 |
container_issue |
3 |
container_start_page |
293 |
op_container_end_page |
301 |
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1809753324687196160 |