Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway
The Ancestral South Sandwich Arc (ASSA) has a short life-span of c.20 m.y. (Early Oligocene to Middle-Upper Miocene) before slab retreat and subsequent ‘resurrection’ as the active South Sandwich Island Arc (SSIA). The ASSA is, however, significant because it straddled the eastern margin of the Drak...
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ftnerc:oai:nora.nerc.ac.uk:504783 2023-05-15T16:02:32+02:00 Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway Pearce, J.A. Hastie, A.R. Leat, P.T. Dalziel, I.W. Lawver, L.A. Barker, P.F. Millar, I.L. Barry, T.L. Bevins, R.E. 2014-12 text http://nora.nerc.ac.uk/id/eprint/504783/ https://nora.nerc.ac.uk/id/eprint/504783/1/Composition%20and%20Evolution%20of%20the%20Ancestral%20South%20Sandwich%20Arc%20AAM.pdf http://www.sciencedirect.com/science/article/pii/S0921818114001829 en eng Elsevier https://nora.nerc.ac.uk/id/eprint/504783/1/Composition%20and%20Evolution%20of%20the%20Ancestral%20South%20Sandwich%20Arc%20AAM.pdf Pearce, J.A.; Hastie, A.R.; Leat, P.T.; Dalziel, I.W.; Lawver, L.A.; Barker, P.F.; Millar, I.L.; Barry, T.L.; Bevins, R.E. 2014 Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway. Global and Planetary Change, 123B. 298-322. https://doi.org/10.1016/j.gloplacha.2014.08.017 <https://doi.org/10.1016/j.gloplacha.2014.08.017> Publication - Article PeerReviewed 2014 ftnerc https://doi.org/10.1016/j.gloplacha.2014.08.017 2023-02-04T19:38:34Z The Ancestral South Sandwich Arc (ASSA) has a short life-span of c.20 m.y. (Early Oligocene to Middle-Upper Miocene) before slab retreat and subsequent ‘resurrection’ as the active South Sandwich Island Arc (SSIA). The ASSA is, however, significant because it straddled the eastern margin of the Drake Passage Gateway where it formed a potential barrier to deep ocean water and mantle flow from the Pacific to Atlantic. The ASSA may be divided into three parts, from north to south: the Central Scotia Sea (CSS), the Discovery segment, and the Jane segment. Published age data coupled with new geochemical data (major elements, trace elements, Hf-Nd-Sr-Pb isotopes) from the three ASSA segments place constraints on models for the evolution of the arc and hence gateway development. The CSS segment has two known periods of activity. The older, Oligocene, period produced basic-acid, mostly calc-alkaline rocks, best explained in terms of subduction initiation volcanism of Andean-type (no slab rollback). The younger, Middle-Late Miocene period produced basic-acid, high-K calc-alkaline rocks (lavas and pyroclastic rocks with abundant volcanigenic sediments) which, despite being erupted on oceanic crust, have continental arc characteristics best explained in terms of a large, hot subduction flux most typical of a syn- or post-collision arc setting. Early-Middle Miocene volcanism in the Discovery and Jane arc segments is geochemically quite different, being typically tholeiitic and compositionally similar to many lavas from the active South Sandwich island arc front. There is indirect evidence for Western Pacific-type (slab rollback) subduction initiation in the southern part of the ASSA and for the back-arc basins (the Jane and Scan Basins) to have been active at the time of arc volcanism. Models for the death of the ASSA in the south following a series of ridge-trench collisions, are not positively supported by any geochemical evidence of hot subduction, but cessation of subduction by approach of progressively more buoyant ... Article in Journal/Newspaper Drake Passage Scotia Sea Natural Environment Research Council: NERC Open Research Archive Drake Passage Scotia Sea Pacific Global and Planetary Change 123 298 322 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The Ancestral South Sandwich Arc (ASSA) has a short life-span of c.20 m.y. (Early Oligocene to Middle-Upper Miocene) before slab retreat and subsequent ‘resurrection’ as the active South Sandwich Island Arc (SSIA). The ASSA is, however, significant because it straddled the eastern margin of the Drake Passage Gateway where it formed a potential barrier to deep ocean water and mantle flow from the Pacific to Atlantic. The ASSA may be divided into three parts, from north to south: the Central Scotia Sea (CSS), the Discovery segment, and the Jane segment. Published age data coupled with new geochemical data (major elements, trace elements, Hf-Nd-Sr-Pb isotopes) from the three ASSA segments place constraints on models for the evolution of the arc and hence gateway development. The CSS segment has two known periods of activity. The older, Oligocene, period produced basic-acid, mostly calc-alkaline rocks, best explained in terms of subduction initiation volcanism of Andean-type (no slab rollback). The younger, Middle-Late Miocene period produced basic-acid, high-K calc-alkaline rocks (lavas and pyroclastic rocks with abundant volcanigenic sediments) which, despite being erupted on oceanic crust, have continental arc characteristics best explained in terms of a large, hot subduction flux most typical of a syn- or post-collision arc setting. Early-Middle Miocene volcanism in the Discovery and Jane arc segments is geochemically quite different, being typically tholeiitic and compositionally similar to many lavas from the active South Sandwich island arc front. There is indirect evidence for Western Pacific-type (slab rollback) subduction initiation in the southern part of the ASSA and for the back-arc basins (the Jane and Scan Basins) to have been active at the time of arc volcanism. Models for the death of the ASSA in the south following a series of ridge-trench collisions, are not positively supported by any geochemical evidence of hot subduction, but cessation of subduction by approach of progressively more buoyant ... |
format |
Article in Journal/Newspaper |
author |
Pearce, J.A. Hastie, A.R. Leat, P.T. Dalziel, I.W. Lawver, L.A. Barker, P.F. Millar, I.L. Barry, T.L. Bevins, R.E. |
spellingShingle |
Pearce, J.A. Hastie, A.R. Leat, P.T. Dalziel, I.W. Lawver, L.A. Barker, P.F. Millar, I.L. Barry, T.L. Bevins, R.E. Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway |
author_facet |
Pearce, J.A. Hastie, A.R. Leat, P.T. Dalziel, I.W. Lawver, L.A. Barker, P.F. Millar, I.L. Barry, T.L. Bevins, R.E. |
author_sort |
Pearce, J.A. |
title |
Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway |
title_short |
Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway |
title_full |
Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway |
title_fullStr |
Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway |
title_full_unstemmed |
Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway |
title_sort |
composition and evolution of the ancestral south sandwich arc: implications for the flow of deep ocean water and mantle through the drake passage gateway |
publisher |
Elsevier |
publishDate |
2014 |
url |
http://nora.nerc.ac.uk/id/eprint/504783/ https://nora.nerc.ac.uk/id/eprint/504783/1/Composition%20and%20Evolution%20of%20the%20Ancestral%20South%20Sandwich%20Arc%20AAM.pdf http://www.sciencedirect.com/science/article/pii/S0921818114001829 |
geographic |
Drake Passage Scotia Sea Pacific |
geographic_facet |
Drake Passage Scotia Sea Pacific |
genre |
Drake Passage Scotia Sea |
genre_facet |
Drake Passage Scotia Sea |
op_relation |
https://nora.nerc.ac.uk/id/eprint/504783/1/Composition%20and%20Evolution%20of%20the%20Ancestral%20South%20Sandwich%20Arc%20AAM.pdf Pearce, J.A.; Hastie, A.R.; Leat, P.T.; Dalziel, I.W.; Lawver, L.A.; Barker, P.F.; Millar, I.L.; Barry, T.L.; Bevins, R.E. 2014 Composition and evolution of the Ancestral South Sandwich Arc: implications for the flow of deep ocean water and mantle through the Drake Passage gateway. Global and Planetary Change, 123B. 298-322. https://doi.org/10.1016/j.gloplacha.2014.08.017 <https://doi.org/10.1016/j.gloplacha.2014.08.017> |
op_doi |
https://doi.org/10.1016/j.gloplacha.2014.08.017 |
container_title |
Global and Planetary Change |
container_volume |
123 |
container_start_page |
298 |
op_container_end_page |
322 |
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1766398190444085248 |