Why are there no back-arc basins around the eastern Pacific margin?
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Nacional Autónoma de México
2002
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| _version_ | 1876471265247625216 |
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| author | Susumu Nishimura |
| author_facet | Susumu Nishimura |
| contents | Why are there no back-arc basins around the eastern Pacific margin? Susumu Nishimura Ciencias de la Tierra back arc basins subduction Pacific Ocean There are many back-arc basins (system of island arc and back-arc seas) on the western marginof the Pacific Ocean, but we do not find any back-arc basins on the eastern of the Pacific margineven though volcanism related to subducting slabs has been operating on both sides of the Pacific. Itseems that subduction of oceanic plates contributes to volcanism not only through the supply of slabderivedfluids necessary for upwelling of magma diapirs, but also by inducing convention in themantle wedge so as to maintain the hot mantle layer within the wedge. Dehydration from the hydrouslayer of old descending slabs at depths of 100 to 300 km is important for the genesis of volcanicchains and back-arc spreading. In contrast, dehydration from the hydrous layer of young descendingslabs acts quite differently on the origin of volcanism. These differences are shown by the examinationof high pressure and high temperature phase changes in MORB (mid-oceanic ridge basalt)+ H2O reactions. 2002 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57219304 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.3 Vol.19 |
| format | Artículo científico |
| id | redalyc_57219304 |
| institution | Redalyc |
| language | en |
| publishDate | 2002 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Why are there no back-arc basins around the eastern Pacific margin? Susumu Nishimura Ciencias de la Tierra back arc basins subduction Pacific Ocean Why are there no back-arc basins around the eastern Pacific margin? Susumu Nishimura Ciencias de la Tierra back arc basins subduction Pacific Ocean There are many back-arc basins (system of island arc and back-arc seas) on the western marginof the Pacific Ocean, but we do not find any back-arc basins on the eastern of the Pacific margineven though volcanism related to subducting slabs has been operating on both sides of the Pacific. Itseems that subduction of oceanic plates contributes to volcanism not only through the supply of slabderivedfluids necessary for upwelling of magma diapirs, but also by inducing convention in themantle wedge so as to maintain the hot mantle layer within the wedge. Dehydration from the hydrouslayer of old descending slabs at depths of 100 to 300 km is important for the genesis of volcanicchains and back-arc spreading. In contrast, dehydration from the hydrous layer of young descendingslabs acts quite differently on the origin of volcanism. These differences are shown by the examinationof high pressure and high temperature phase changes in MORB (mid-oceanic ridge basalt)+ H2O reactions. 2002 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57219304 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.3 Vol.19 |
| title | Why are there no back-arc basins around the eastern Pacific margin? |
| topic | Ciencias de la Tierra back arc basins subduction Pacific Ocean |
| url | https://www.redalyc.org/articulo.oa?id=57219304 |