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Registros recuperados: 5
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Agelastatin A, a new skeleton cytotoxic alkaloid of the oroidin family : isolation from the Axinellid sponge Agelas dendromorpha of the Coral Sea IRD
D'Ambrosio, M.; Guerriero, A.; Debitus, Cécile; Ribes, O.; Pusset, J.; Leroy, S.; Pietra, F..
Agelastatin A, isolated from the axinellid sponge #Agelas dendromorpha$ of the Coral Sea, is a new skeleton alkaloid with, unusually for the oroidin family to which it belongs, marked cytototoxicity toward tumour cells in culture. (Résumé d'auteur)
Tipo: Text Palavras-chave: INVERTEBRE AQUATIQUE; ALCALOIDE; CULTURE IN VITRO; ACTIVITE BIOLOGIQUE; AGELASTATINE A; CYTOTOXICITE; EPONGE.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:43829
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Crustal geometry of the northeastern Gulf of Aden passive margin: localization of the deformation inferred from receiver function analysis ArchiMer
Tiberi, C.; Leroy, S.; D'Acremont, E.; Bellahsen, N.; Ebinger, C.; Al-lazki, A.; Pointu, A..
Here we use receiver function analysis to retrieve crustal thickness and crustal composition along the 35-My-old passive margin of the eastern Gulf of Aden. Our aims are to use results from the 3-D seismic array to map crustal stretching across and along the Aden margin in southern Oman. The array recorded local and teleseismic events between 2003 March and 2004 March. Seventy-eight events were used in our joint inversions for Vp/Vs ratio and depth. The major results are: (1) Crustal thickness decreases from the uplifted rift flank of the margin towards the Sheba mid-ocean ridge. We found a crustal thickness of about 35 km beneath the northern rift flank. This value decreases sharply to 26 km beneath the post-rift subsidence zone on the Salalah coastal...
Tipo: Text Palavras-chave: Crustal structure; Receiver function; Rifted margin; Segmentation; Seismology.
Ano: 2007 URL: https://archimer.ifremer.fr/doc/00207/31826/30228.pdf
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Gondwana breakup: messages from the North Natal Valley ArchiMer
Moulin, Maryline; Aslanian, Daniel; Evain, Mikael; Leprêtre, Angelique; Schnurle, Philippe; Verrier, Fanny; Thompson, Joseph Offei; De Clarens, P.; Leroy, S.; Dias, N.; The Pamela‐moz35 Team,.
The Natal Valley, offshore Mozambique, is a key area for understanding the evolution of East Gondwana. Within the scope of the integrated multidisciplinary PAMELA project, we present new wide‐angle seismic data and interpretations, which considerably alter Geoscience paradigms. These data reveal the presence of a 30 km‐thick crust that we argue to be of continental nature. This falsifies all the most recent paleo‐reconstructions of the Gondwana. This 30 km‐thick continental crust 1000 m below sea level implies a complex history with probable intrusions of mantle‐derived melts in the lower crust, connected to several occurrences of magmatism, which seems to evidence the crucial role of the lower continental crust in passive margin genesis.
Tipo: Text
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00598/71055/69368.pdf
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Polyphase tectonic evolution of fore‐arc basin related to STEP fault as revealed by seismic reflection data from the Alboran Sea (W‐Mediterranean) ArchiMer
D'Acremont, E.; Lafosse, M.; Rabaute, A.; Teurquety, G.; Do Couto, D.; Ercilla, G.; Juan, C.; Mercier De Lépinay, B.; Lafuerza, Sara; Galindo‐zaldivar, J.; Estrada, F.; Vazquez, J.t.; Leroy, S.; Poort, J.; Ammar, A.; Gorini, C..
Since the Miocene, the thinned continental crust below the Alboran Sea as well as its overlying sedimentary cover have been undergoing deformation caused by both convergence of Eurasia and Africa and by deep processes related to the Tethyan slab retreat. Part of this deformation is recorded at the Xauen and Tofiño banks in the southern Alboran Sea. Using swath bathymetry and multichannel seismic reflection data, we identified different stages and styles of deformation. The South Alboran Basin is made up of Early Miocene to Pliocene sedimentary layers that correlate with the West Alboran Basin depocenter and are dominated by E‐W trending folds and thrusts. The Xauen and Tofiño Banks first recorded the phase of extension and strike‐slip movement during the...
Tipo: Text
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00612/72436/71382.pdf
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The Cryogenian arc formation and successive high-K calc-alkaline plutons of Socotra Island (Yemen) ArchiMer
Denele, Y.; Leroy, S.; Pelleter, Ewan; Pik, R.; Talbot, J-y.; Khanbari, K..
The Socotra Island belongs to the southern rifted margin of the Gulf of Aden and occupied in Neoproterozoic times a key position to constrain the age and the nature of the largely hidden Neoproterozoic rocks of the Arabian plate. Our integrated field, petrographic, geochemical and geochronological study in the Neoproterozoic rocks recognises three main successive events: (a) high-temperature ductile deformation and metamorphism forming probably in a compressive or transpressive regime; (b) mafic to intermediate intrusions as vertical sheets, kilometre-scale gabbro laccoliths, mafic dike swarm and lavas which present mainly a depleted arc signature with some evidences of evolution from an enriched-arc signature; (c) felsic intrusions mainly composed of...
Tipo: Text Palavras-chave: Neoproterozoic; East African-Antartic Orogen; Arabian-Nubian shield; Socotra Island; Andean-type arc; Back-arc basin.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00090/20131/17839.pdf
Registros recuperados: 5
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