The Disappointment Hill complex: Proterozoic granulites in southwestern Newfoundland
ABSTRACT The Steel Mountain terrane of the southern Long Range Mountains forms a fault-bounded massif of (meta)plutonic rocks including the Disappointment Hill complex (DHC), a sequence of granulite-facies lithologies containing charnockite emplaced at 1498 Ma (U-Pb, zircon). Quartzofeldspathic gnei...
Published in: | Transactions of the Royal Society of Edinburgh: Earth Sciences |
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1991
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Online Access: | http://dx.doi.org/10.1017/s0263593300007513 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0263593300007513 |
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crcambridgeupr:10.1017/s0263593300007513 2024-03-03T08:43:21+00:00 The Disappointment Hill complex: Proterozoic granulites in southwestern Newfoundland Owen, J. V. Currie, K. L. 1991 http://dx.doi.org/10.1017/s0263593300007513 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0263593300007513 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Transactions of the Royal Society of Edinburgh: Earth Sciences volume 82, issue 1, page 55-63 ISSN 0263-5933 1473-7116 Paleontology Earth and Planetary Sciences (miscellaneous) journal-article 1991 crcambridgeupr https://doi.org/10.1017/s0263593300007513 2024-02-08T08:25:47Z ABSTRACT The Steel Mountain terrane of the southern Long Range Mountains forms a fault-bounded massif of (meta)plutonic rocks including the Disappointment Hill complex (DHC), a sequence of granulite-facies lithologies containing charnockite emplaced at 1498 Ma (U-Pb, zircon). Quartzofeldspathic gneiss of the DHC contains garnet + biotite + orthopyroxene ± cordierite assemblages indicative of metamorphic P–T conditions of ca 750°C and 400 MPa. The relatively high thermal gradient ( ca 70°C km −1 ) inferred for the DHC is attributed to a magmatic heat source. On grounds of lithology, age and metamorphic grade, the DHC correlates to granulites of the Long Range Inlier (LRI) exposed farther north. Both complexes occur in blocks thrust westward over Taconic allochthons capped by ophiolite nappes. The block containing the DHC, however, preserves younger cover rocks, suggesting that it originated at a higher structural level than the LRI. This model is supported by lower pressure estimates for the DHC relative to the LRI (400 MPa vs 500–800 MPa). The DHC forms a link between Grenvillian rocks of the northern Long Range of Newfoundland and those of Cape Breton Island. The structural position of these massifs suggests that their emplacement was a post-Taconic event. Article in Journal/Newspaper Breton Island Newfoundland Cambridge University Press Breton Island ENVELOPE(141.383,141.383,-66.800,-66.800) Transactions of the Royal Society of Edinburgh: Earth Sciences 82 1 55 63 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Paleontology Earth and Planetary Sciences (miscellaneous) |
spellingShingle |
Paleontology Earth and Planetary Sciences (miscellaneous) Owen, J. V. Currie, K. L. The Disappointment Hill complex: Proterozoic granulites in southwestern Newfoundland |
topic_facet |
Paleontology Earth and Planetary Sciences (miscellaneous) |
description |
ABSTRACT The Steel Mountain terrane of the southern Long Range Mountains forms a fault-bounded massif of (meta)plutonic rocks including the Disappointment Hill complex (DHC), a sequence of granulite-facies lithologies containing charnockite emplaced at 1498 Ma (U-Pb, zircon). Quartzofeldspathic gneiss of the DHC contains garnet + biotite + orthopyroxene ± cordierite assemblages indicative of metamorphic P–T conditions of ca 750°C and 400 MPa. The relatively high thermal gradient ( ca 70°C km −1 ) inferred for the DHC is attributed to a magmatic heat source. On grounds of lithology, age and metamorphic grade, the DHC correlates to granulites of the Long Range Inlier (LRI) exposed farther north. Both complexes occur in blocks thrust westward over Taconic allochthons capped by ophiolite nappes. The block containing the DHC, however, preserves younger cover rocks, suggesting that it originated at a higher structural level than the LRI. This model is supported by lower pressure estimates for the DHC relative to the LRI (400 MPa vs 500–800 MPa). The DHC forms a link between Grenvillian rocks of the northern Long Range of Newfoundland and those of Cape Breton Island. The structural position of these massifs suggests that their emplacement was a post-Taconic event. |
format |
Article in Journal/Newspaper |
author |
Owen, J. V. Currie, K. L. |
author_facet |
Owen, J. V. Currie, K. L. |
author_sort |
Owen, J. V. |
title |
The Disappointment Hill complex: Proterozoic granulites in southwestern Newfoundland |
title_short |
The Disappointment Hill complex: Proterozoic granulites in southwestern Newfoundland |
title_full |
The Disappointment Hill complex: Proterozoic granulites in southwestern Newfoundland |
title_fullStr |
The Disappointment Hill complex: Proterozoic granulites in southwestern Newfoundland |
title_full_unstemmed |
The Disappointment Hill complex: Proterozoic granulites in southwestern Newfoundland |
title_sort |
disappointment hill complex: proterozoic granulites in southwestern newfoundland |
publisher |
Cambridge University Press (CUP) |
publishDate |
1991 |
url |
http://dx.doi.org/10.1017/s0263593300007513 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0263593300007513 |
long_lat |
ENVELOPE(141.383,141.383,-66.800,-66.800) |
geographic |
Breton Island |
geographic_facet |
Breton Island |
genre |
Breton Island Newfoundland |
genre_facet |
Breton Island Newfoundland |
op_source |
Transactions of the Royal Society of Edinburgh: Earth Sciences volume 82, issue 1, page 55-63 ISSN 0263-5933 1473-7116 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0263593300007513 |
container_title |
Transactions of the Royal Society of Edinburgh: Earth Sciences |
container_volume |
82 |
container_issue |
1 |
container_start_page |
55 |
op_container_end_page |
63 |
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1792498774327689216 |