Back-arc extension in the southern Andes: a review and critical reappraisal
The interpretation that the mafic ‘rocas verdes’ (green rocks) complex of the southern Andes represents part of the uplifted floor of a Late Jurassic to Early Cretaceous back-arc basin has proved particularly useful in understanding the geological evolution of the southern Andes, the north Scotia Ri...
Published in: | Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences |
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Online Access: | http://dx.doi.org/10.1098/rsta.1981.0067 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.1981.0067 |
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crroyalsociety:10.1098/rsta.1981.0067 2024-09-15T17:45:13+00:00 Back-arc extension in the southern Andes: a review and critical reappraisal 1981 http://dx.doi.org/10.1098/rsta.1981.0067 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.1981.0067 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences volume 300, issue 1454, page 319-335 ISSN 0080-4614 2054-0272 journal-article 1981 crroyalsociety https://doi.org/10.1098/rsta.1981.0067 2024-07-29T04:23:13Z The interpretation that the mafic ‘rocas verdes’ (green rocks) complex of the southern Andes represents part of the uplifted floor of a Late Jurassic to Early Cretaceous back-arc basin has proved particularly useful in understanding the geological evolution of the southern Andes, the north Scotia Ridge and the Antarctic Peninsula. Clear field evidence of the back-arc setting of the 'rocas verdes’ gabbro-sheeted dyke - pillow lava ophiolitic assemblages has encouraged fruitful petrological and geochemical comparison with mid-ocean ridge and marginal basin basalts, other onshore ophiolite complexes, and Archaean greenstone belts. Uncertainty still surrounds estimates of the original width and depth of the basin, as well as the proportion of new mafic crust, compared with relict sialic crust, in the basin floor. These questions are unresolved, owing mainly to the considerable Lower Cretaceous turbiditic basin infill and the effects of mid-Cretaceous compressional deformation. While the field relations clearly indicate that the ‘rocas verdes’ basin is not an older piece of ocean floor ‘trapped’ behind a volcanic arc, it is not yet clear whether the basin is directly subduction-related or falls in the category of back-arc ‘leaky transforms’ like the proto-Gulf of California or apparent ‘rip-off’ features like the Andaman Sea. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula The Royal Society Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences 300 1454 319 335 |
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crroyalsociety |
language |
English |
description |
The interpretation that the mafic ‘rocas verdes’ (green rocks) complex of the southern Andes represents part of the uplifted floor of a Late Jurassic to Early Cretaceous back-arc basin has proved particularly useful in understanding the geological evolution of the southern Andes, the north Scotia Ridge and the Antarctic Peninsula. Clear field evidence of the back-arc setting of the 'rocas verdes’ gabbro-sheeted dyke - pillow lava ophiolitic assemblages has encouraged fruitful petrological and geochemical comparison with mid-ocean ridge and marginal basin basalts, other onshore ophiolite complexes, and Archaean greenstone belts. Uncertainty still surrounds estimates of the original width and depth of the basin, as well as the proportion of new mafic crust, compared with relict sialic crust, in the basin floor. These questions are unresolved, owing mainly to the considerable Lower Cretaceous turbiditic basin infill and the effects of mid-Cretaceous compressional deformation. While the field relations clearly indicate that the ‘rocas verdes’ basin is not an older piece of ocean floor ‘trapped’ behind a volcanic arc, it is not yet clear whether the basin is directly subduction-related or falls in the category of back-arc ‘leaky transforms’ like the proto-Gulf of California or apparent ‘rip-off’ features like the Andaman Sea. |
format |
Article in Journal/Newspaper |
title |
Back-arc extension in the southern Andes: a review and critical reappraisal |
spellingShingle |
Back-arc extension in the southern Andes: a review and critical reappraisal |
title_short |
Back-arc extension in the southern Andes: a review and critical reappraisal |
title_full |
Back-arc extension in the southern Andes: a review and critical reappraisal |
title_fullStr |
Back-arc extension in the southern Andes: a review and critical reappraisal |
title_full_unstemmed |
Back-arc extension in the southern Andes: a review and critical reappraisal |
title_sort |
back-arc extension in the southern andes: a review and critical reappraisal |
publisher |
The Royal Society |
publishDate |
1981 |
url |
http://dx.doi.org/10.1098/rsta.1981.0067 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.1981.0067 |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences volume 300, issue 1454, page 319-335 ISSN 0080-4614 2054-0272 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rsta.1981.0067 |
container_title |
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences |
container_volume |
300 |
container_issue |
1454 |
container_start_page |
319 |
op_container_end_page |
335 |
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1810492955144749056 |