Cooling history of granulite samples from the ocean–continent transition of the Galicia margin: implications for rifting
Zircon and apatite fission track ages were obtained on two granulite samples that were recovered from the sea floor in the ocean–continent transition area of the Galicia margin (North Atlantic) using the French submersible Nautile. Zircon ages indicate that the rocks cooled through about 250°C in Ca...
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crwiley:10.1046/j.1365-3121.1998.00155.x 2024-09-15T18:23:09+00:00 Cooling history of granulite samples from the ocean–continent transition of the Galicia margin: implications for rifting Fuegenschuh Froitzheim Boillot 1998 http://dx.doi.org/10.1046/j.1365-3121.1998.00155.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.1998.00155.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.1998.00155.x https://onlinelibrary.wiley.com/doi/full-xml/10.1046/j.1365-3121.1998.00155.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Terra Nova volume 10, issue 2, page 96-100 ISSN 0954-4879 1365-3121 journal-article 1998 crwiley https://doi.org/10.1046/j.1365-3121.1998.00155.x 2024-07-25T04:22:31Z Zircon and apatite fission track ages were obtained on two granulite samples that were recovered from the sea floor in the ocean–continent transition area of the Galicia margin (North Atlantic) using the French submersible Nautile. Zircon ages indicate that the rocks cooled through about 250°C in Carboniferous to Early Permian time (307 ± 42 Ma and 287±35 Ma). Hence, the granulites do not represent the prerift lower crust but were in an upper crustal position long before rifting started. Apatites yielded Early Cretaceous ages (126 ± 6.7 Myr and 129 ± 13.4 Myr), indicating cooling through 90 ± 30°C coeval with the main rifting phase that preceded continental breakup. We assume that the granulite samples originate from a tectonic breccia cropping out near one of the sample locations. This breccia formed along a synrift detachment accommodating continental breakup and final exhumation of the Galicia margin’s peridotite ridge. Article in Journal/Newspaper North Atlantic Wiley Online Library Terra Nova 10 2 96 100 |
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English |
description |
Zircon and apatite fission track ages were obtained on two granulite samples that were recovered from the sea floor in the ocean–continent transition area of the Galicia margin (North Atlantic) using the French submersible Nautile. Zircon ages indicate that the rocks cooled through about 250°C in Carboniferous to Early Permian time (307 ± 42 Ma and 287±35 Ma). Hence, the granulites do not represent the prerift lower crust but were in an upper crustal position long before rifting started. Apatites yielded Early Cretaceous ages (126 ± 6.7 Myr and 129 ± 13.4 Myr), indicating cooling through 90 ± 30°C coeval with the main rifting phase that preceded continental breakup. We assume that the granulite samples originate from a tectonic breccia cropping out near one of the sample locations. This breccia formed along a synrift detachment accommodating continental breakup and final exhumation of the Galicia margin’s peridotite ridge. |
format |
Article in Journal/Newspaper |
author |
Fuegenschuh Froitzheim Boillot |
spellingShingle |
Fuegenschuh Froitzheim Boillot Cooling history of granulite samples from the ocean–continent transition of the Galicia margin: implications for rifting |
author_facet |
Fuegenschuh Froitzheim Boillot |
author_sort |
Fuegenschuh |
title |
Cooling history of granulite samples from the ocean–continent transition of the Galicia margin: implications for rifting |
title_short |
Cooling history of granulite samples from the ocean–continent transition of the Galicia margin: implications for rifting |
title_full |
Cooling history of granulite samples from the ocean–continent transition of the Galicia margin: implications for rifting |
title_fullStr |
Cooling history of granulite samples from the ocean–continent transition of the Galicia margin: implications for rifting |
title_full_unstemmed |
Cooling history of granulite samples from the ocean–continent transition of the Galicia margin: implications for rifting |
title_sort |
cooling history of granulite samples from the ocean–continent transition of the galicia margin: implications for rifting |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.1046/j.1365-3121.1998.00155.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.1998.00155.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.1998.00155.x https://onlinelibrary.wiley.com/doi/full-xml/10.1046/j.1365-3121.1998.00155.x |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Terra Nova volume 10, issue 2, page 96-100 ISSN 0954-4879 1365-3121 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-3121.1998.00155.x |
container_title |
Terra Nova |
container_volume |
10 |
container_issue |
2 |
container_start_page |
96 |
op_container_end_page |
100 |
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1810463295905202176 |