http://www.cnr.it/ontology/cnr/individuo/prodotto/ID278449

Nonvolcanic tectonic islands in ancient and modern oceans (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Nonvolcanic tectonic islands in ancient and modern oceans (Articolo in rivista) (literal)

Anno

2013-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1002/ggge.20279 (literal)

Alternative label

Camilla Palmiotto1,2,*, Laura Corda3, Marco Ligi2, Anna Cipriani4,5, Henry J. B. Dick6, Eric Douville7, Luca Gasperini2, Paolo Montagna2,4,7, François Thil7, Anna Maria Borsetti2, Barbara Balestra8, Enrico Bonatti2,4 (2013)
Nonvolcanic tectonic islands in ancient and modern oceans
in Geochemistry, geophysics, geosystems
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Camilla Palmiotto1,2,*, Laura Corda3, Marco Ligi2, Anna Cipriani4,5, Henry J. B. Dick6, Eric Douville7, Luca Gasperini2, Paolo Montagna2,4,7, François Thil7, Anna Maria Borsetti2, Barbara Balestra8, Enrico Bonatti2,4 (literal)

Pagina inizio

4698 (literal)

Pagina fine

4717 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

14 (literal)

Rivista

Geochemistry, geophysics, geosystems (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

10 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

1Dipartimento di Scienze Biologiche Geologiche e Ambientali, Università di Bologna, Bologna, Italy 2Istituto di Scienze Marine, CNR, Bologna, Italy 3Dipartimento di Scienze della Terra, Università \"La Sapienza\", Rome, Italy 4Lamont Doherty Earth Observatory, Columbia University, Palisades, New York, USA 5Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia, Modena, Italy 6Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA 7Laboratoire des Sciences du Climat et de l'Environnement, Laboratoire mixte CNRS-CEA, Gif-sur-Yvette, France 8Institute of Marine Sciences, University of California Santa Cruz, Santa Cruz, California, USA (literal)

Titolo

Nonvolcanic tectonic islands in ancient and modern oceans (literal)

Abstract

Most oceanic islands are due to excess volcanism caused by thermal and/or compositional mantle melting anomalies. We call attention here to another class of oceanic islands, due not to volcanism but to vertical motions of blocks of oceanic lithosphere related to transform tectonics. Sunken tectonic islands capped by carbonate platforms have been previously identified along the Vema and Romanche transforms in the equatorial Atlantic. We reprocessed seismic reflection lines, did new facies analyses and 87Sr/86Sr dating of carbonate samples from the carbonate platforms. A 50 km long narrow paleoisland flanking the Vema transform, underwent subsidence, erosion, and truncation at sea level; it was then capped by a 500 m thick carbonate platform dated by 87Sr/86Sr at ~11-10 Ma. Three former islands on the crest of the Romanche transverse ridge are now at ~900 m bsl; they show horizontal truncated surfaces of oceanic crust capped by ~300 m thick carbonate platforms, with 10-6 Ma Sr isotopic ages. These sunken islands formed due to vertical tectonics related to transtension/transpression along long-offset slow-slip transforms. Another tectonic sunken island is Atlantis Bank, an uplifted gabbroic block along the Atlantis II transform (SW Indian Ridge) ~700 m bsl. A modern tectonic island is St. Peter and St. Paul Rocks, a rising slab of upper mantle located at the St. Paul transform (equatorial Atlantic). \"Cold\" tectonic islands contrast with \"hot\" volcanic islands related to mantle thermal and/or compositional anomalies along accretionary boundaries and within oceanic plates, or to supra-subduction mantle melting that gives rise to islands arcs. (literal)

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