Metamorphic and thermal history of a fore-arc basin: the Fossil Bluff Group, Alexander Island, Antarctica
The Himalia Ridge Formation (Fossil Bluff Group), Alexander Island is a 2.2-km-thick sequence of Upper Jurassic-Lower Cretaceous conglomerates, sandstones and mudstones, derived from an andesitic volcanic arc and deposited in a fore-arc basin. The metamorphic and thermal history of the formation has...
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ftnerc:oai:nora.nerc.ac.uk:12291 2023-05-15T13:15:17+02:00 Metamorphic and thermal history of a fore-arc basin: the Fossil Bluff Group, Alexander Island, Antarctica Miller, S. MacDonald, D.I.M. 2004 http://nora.nerc.ac.uk/id/eprint/12291/ http://petrology.oxfordjournals.org/content/45/7/1453.full unknown Oxford University Press Miller, S.; MacDonald, D.I.M. 2004 Metamorphic and thermal history of a fore-arc basin: the Fossil Bluff Group, Alexander Island, Antarctica. Journal of Petrology, 45 (7). 1453-1465. https://doi.org/10.1093/petrology/egh025 <https://doi.org/10.1093/petrology/egh025> Earth Sciences Publication - Article PeerReviewed 2004 ftnerc https://doi.org/10.1093/petrology/egh025 2023-02-04T19:27:51Z The Himalia Ridge Formation (Fossil Bluff Group), Alexander Island is a 2.2-km-thick sequence of Upper Jurassic-Lower Cretaceous conglomerates, sandstones and mudstones, derived from an andesitic volcanic arc and deposited in a fore-arc basin. The metamorphic and thermal history of the formation has been determined using authigenic mineral assemblages and vitrinite reflectance measurements. Metamorphic effects include compaction, pore-space reduction, cementation and dissolution and replacement of detrital grains by clay minerals (smectite, illite/smectite, corrensite and kaolinite), calcite, chlorite, laumontite, prehnite, pumpellyite, albite and mica, with less common quartz, haematite, pyrite and epidote. The authigenic mineral assemblages exhibit a depth-dependence, and laumontite and calcite exhibit a strong antipathetic relationship. Detrital organic matter in the argillaceous layers has vitrinite reflectance values (R-o) ranging from 2.3 to 3.7%. This indicates considerable thermal maturation, with a systematic increase in reflectivity with increasing depth. There is good correlation of metamorphic mineral assemblages with chlorite crystallinity and vitrinite reflectance values-all indicating temperatures in the range of 140 +/- 20degreesC at the top of the sequence to 250 +/- 10degreesC at the base of the sequence. The temperatures suggest a geothermal gradient of 36-64degreesC/km and a most likely gradient of 50degreesC/km. It is suggested that this higher-than-average gradient for a fore-arc basin resulted either from rifting during basin formation or from a late-stage arc migration event. Article in Journal/Newspaper Alexander Island Antarc* Antarctica Antarctica Journal Natural Environment Research Council: NERC Open Research Archive Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Fossil Bluff ENVELOPE(-68.274,-68.274,-71.332,-71.332) Himalia Ridge ENVELOPE(-68.417,-68.417,-70.833,-70.833) Journal of Petrology 45 7 1453 1465 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Miller, S. MacDonald, D.I.M. Metamorphic and thermal history of a fore-arc basin: the Fossil Bluff Group, Alexander Island, Antarctica |
topic_facet |
Earth Sciences |
description |
The Himalia Ridge Formation (Fossil Bluff Group), Alexander Island is a 2.2-km-thick sequence of Upper Jurassic-Lower Cretaceous conglomerates, sandstones and mudstones, derived from an andesitic volcanic arc and deposited in a fore-arc basin. The metamorphic and thermal history of the formation has been determined using authigenic mineral assemblages and vitrinite reflectance measurements. Metamorphic effects include compaction, pore-space reduction, cementation and dissolution and replacement of detrital grains by clay minerals (smectite, illite/smectite, corrensite and kaolinite), calcite, chlorite, laumontite, prehnite, pumpellyite, albite and mica, with less common quartz, haematite, pyrite and epidote. The authigenic mineral assemblages exhibit a depth-dependence, and laumontite and calcite exhibit a strong antipathetic relationship. Detrital organic matter in the argillaceous layers has vitrinite reflectance values (R-o) ranging from 2.3 to 3.7%. This indicates considerable thermal maturation, with a systematic increase in reflectivity with increasing depth. There is good correlation of metamorphic mineral assemblages with chlorite crystallinity and vitrinite reflectance values-all indicating temperatures in the range of 140 +/- 20degreesC at the top of the sequence to 250 +/- 10degreesC at the base of the sequence. The temperatures suggest a geothermal gradient of 36-64degreesC/km and a most likely gradient of 50degreesC/km. It is suggested that this higher-than-average gradient for a fore-arc basin resulted either from rifting during basin formation or from a late-stage arc migration event. |
format |
Article in Journal/Newspaper |
author |
Miller, S. MacDonald, D.I.M. |
author_facet |
Miller, S. MacDonald, D.I.M. |
author_sort |
Miller, S. |
title |
Metamorphic and thermal history of a fore-arc basin: the Fossil Bluff Group, Alexander Island, Antarctica |
title_short |
Metamorphic and thermal history of a fore-arc basin: the Fossil Bluff Group, Alexander Island, Antarctica |
title_full |
Metamorphic and thermal history of a fore-arc basin: the Fossil Bluff Group, Alexander Island, Antarctica |
title_fullStr |
Metamorphic and thermal history of a fore-arc basin: the Fossil Bluff Group, Alexander Island, Antarctica |
title_full_unstemmed |
Metamorphic and thermal history of a fore-arc basin: the Fossil Bluff Group, Alexander Island, Antarctica |
title_sort |
metamorphic and thermal history of a fore-arc basin: the fossil bluff group, alexander island, antarctica |
publisher |
Oxford University Press |
publishDate |
2004 |
url |
http://nora.nerc.ac.uk/id/eprint/12291/ http://petrology.oxfordjournals.org/content/45/7/1453.full |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-68.274,-68.274,-71.332,-71.332) ENVELOPE(-68.417,-68.417,-70.833,-70.833) |
geographic |
Alexander Island Fossil Bluff Himalia Ridge |
geographic_facet |
Alexander Island Fossil Bluff Himalia Ridge |
genre |
Alexander Island Antarc* Antarctica Antarctica Journal |
genre_facet |
Alexander Island Antarc* Antarctica Antarctica Journal |
op_relation |
Miller, S.; MacDonald, D.I.M. 2004 Metamorphic and thermal history of a fore-arc basin: the Fossil Bluff Group, Alexander Island, Antarctica. Journal of Petrology, 45 (7). 1453-1465. https://doi.org/10.1093/petrology/egh025 <https://doi.org/10.1093/petrology/egh025> |
op_doi |
https://doi.org/10.1093/petrology/egh025 |
container_title |
Journal of Petrology |
container_volume |
45 |
container_issue |
7 |
container_start_page |
1453 |
op_container_end_page |
1465 |
_version_ |
1766267874667659264 |