Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/8034
DC Field | Value | Language |
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dc.contributor.authorall | Ligi, M.; CNR-ISMAR Bologna | en |
dc.contributor.authorall | Bonatti, E.; CNR-ISMAR Bologna | en |
dc.contributor.authorall | Bortoluzzi, G.; CNR-ISMAR Bologna | en |
dc.contributor.authorall | Cipriani, A.; CNR-ISMAR Bologna | en |
dc.contributor.authorall | Cocchi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.authorall | Caratori Tontini, F.; GNS Science | en |
dc.contributor.authorall | Carminati, E.; Università di Roma "La Sapienza" | en |
dc.contributor.authorall | Ottolini, L.; CNR -Pavia | en |
dc.contributor.authorall | Schettino, A.; Università di Camerino | en |
dc.date.accessioned | 2012-09-04T10:14:15Z | en |
dc.date.available | 2012-09-04T10:14:15Z | en |
dc.date.issued | 2012-08-18 | en |
dc.identifier.uri | http://hdl.handle.net/2122/8034 | en |
dc.description.abstract | We obtained areal variations of crustal thickness, magnetic intensity, and degree of melting of the sub- axial upwelling mantle at Thetis and Nereus Deeps, the two northernmost axial segments of initial oceanic crustal accretion in the Red Sea, where Arabia is separating from Africa. The initial emplacement of oceanic crust occurred at South Thetis and Central Nereus roughly $2.2 and $2 Ma, respectively, and is taking place today in the northern Thetis and southern Nereus tips. Basaltic glasses major and trace element com- position suggests a rift-to-drift transition marked by magmatic activity with typical MORB signature, with no contamination by continental lithosphere, but with slight differences in mantle source composition and/or potential temperature between Thetis and Nereus. Eruption rate, spreading rate, magnetic intensity, crustal thickness and degree of mantle melting were highest at both Thetis and Nereus in the very initial phases of oceanic crust accretion, immediately after continental breakup, probably due to fast mantle upwelling enhanced by an initially strong horizontal thermal gradient. This is consistent with a rift model where the lower continental lithosphere has been replaced by upwelling asthenosphere before continental rupturing, implying depth-dependent extension due to decoupling between the upper and lower lithosphere with man- tle-lithosphere-necking breakup before crustal-necking breakup. Independent along-axis centers of upwell- ing form at the rifting stage just before oceanic crust accretion, with buoyancy-driven convection within a hot, low viscosity asthenosphere. Each initial axial cell taps a different asthenospheric source and serves as nucleus for axial propagation of oceanic accretion, resulting in linear segments of spreading. | en |
dc.language.iso | English | en |
dc.publisher.name | American Geophysical Union | en |
dc.relation.ispartof | Geochemistry Geophysics Geosystems | en |
dc.relation.ispartofseries | 8/13 (2012) | en |
dc.subject | Red Sea | en |
dc.subject | Gravity and Magnetics | en |
dc.subject | magma genesis and partial melting | en |
dc.subject | mantle processes | en |
dc.subject | transition from continental to oceanic rift | en |
dc.title | Birth of an ocean in the Red Sea: Initial pangs | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | Q08009 | en |
dc.subject.INGV | 04. Solid Earth::04.03. Geodesy::04.03.04. Gravity anomalies | en |
dc.subject.INGV | 04. Solid Earth::04.04. Geology::04.04.04. Marine geology | en |
dc.subject.INGV | 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies | en |
dc.subject.INGV | 04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics | en |
dc.identifier.doi | 10.1029/2012GC004155 | en |
dc.description.obiettivoSpecifico | 2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attive | en |
dc.description.obiettivoSpecifico | 3.3. Geodinamica e struttura dell'interno della Terra | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | partially_open | en |
dc.relation.issn | 1525-2027 | en |
dc.contributor.author | Ligi, M. | en |
dc.contributor.author | Bonatti, E. | en |
dc.contributor.author | Bortoluzzi, G. | en |
dc.contributor.author | Cipriani, A. | en |
dc.contributor.author | Cocchi, L. | en |
dc.contributor.author | Caratori Tontini, F. | en |
dc.contributor.author | Carminati, E. | en |
dc.contributor.author | Ottolini, L. | en |
dc.contributor.author | Schettino, A. | en |
dc.contributor.department | CNR-ISMAR Bologna | en |
dc.contributor.department | CNR-ISMAR Bologna | en |
dc.contributor.department | CNR-ISMAR Bologna | en |
dc.contributor.department | CNR-ISMAR Bologna | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.department | Università di Roma "La Sapienza" | en |
dc.contributor.department | CNR -Pavia | en |
dc.contributor.department | Università di Camerino | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Istituto di Scienze Marine, Consiglio Nazionale delle Ricerche, Bologna e Lamont Doherty Earth Observatory, Columbia University | - |
crisitem.author.dept | Lamont Doherty Earth Observatory, Columbia University | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
crisitem.author.dept | Consiglio Nazionale delle Ricerche—Istituto di Geoscienze e Georisorse (IGG), Sezione di Pavia, 27100 Pavia, Italy | - |
crisitem.author.dept | Dipartimento di Scienze della Terra, Università di Camerino | - |
crisitem.author.orcid | 0000-0002-5098-5907 | - |
crisitem.author.orcid | 0000-0001-7835-1116 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
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ligi_g3_2012.pdf | 15.89 MB | Adobe PDF | ||
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