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  • 1
    Online Resource
    Online Resource
    Le Feu des Abysses. (2008)
    Versailles :Quae,
    Details
    Keywords: Geology. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (179 pages)
    Edition: 1st ed.
    ISBN: 9782759202812
    Series Statement: Hors Collection
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=3399251
    Language: French
    Note: Intro -- Table des matières -- Préface -- Avant-propos -- Remerciements -- La planète océane -- Naissance d'une planète -- Une structure en pelure d'oignon -- Une lithosphère en mouvement -- Naissance d'un océan -- Le renouvellement des fonds océaniques -- La lithosphère océanique recyclée -- Téthys, un océan disparu -- Le cycle de Wilson -- Une journée de plongée -- Les submersibles Cyana et Nautile -- Une longue préparation -- Neuf heures d'intense émotion -- La dorsale océanique -- La dorsale du Pacifique est -- Des fonds marins à ciel ouvert -- L'accrétion océanique -- Les sources chaudes du fond des mers -- La faille transformante -- San Andreas, la plus célèbre faille transformante -- La faille transformante Garrett -- Les volcans hors-axe -- Les volcans hors-axe à 11° 30' N et 13° N -- L'origine des volcans hors-axe -- Une croissance par étapes -- Du pahoehoe au « aa » -- Une forme tronconique -- La caldera -- Formation de gisements hydrothermaux -- Formation de gisements métallifères -- L'abondance des monts sous-marins -- Les points chauds -- Les points chauds de la Société, des Australes et de Pitcairn -- Le volcan sous-marin intraplaque -- Le point chaud de Pitcairn -- De Teahitia à Bora-Bora : la construction d'une île -- Bibliographie -- Glossaire -- Campagnes photographiques.
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    GEOMAR EBL
  • 2
    Electronic Resource
    Electronic Resource
    Magmatic evolution of the Easter microplate-Crough Seamount region (South East Pacific) (1995)
    Springer
    Marine geophysical researches 17 (1995), S. 375-397 
    Details
    ISSN: 1573-0581
    Keywords: Petrology ; structure ; volcanism ; microplate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The Easter microplate-Crough Seamount region located between 25° S–116° W and 25° S–122° W consists of a chain of seamounts forming isolated volcanoes and elongated (100–200 km in length) en echelon volcanic ridges oriented obliquely NE (N 065°), to the present day general spreading direction (N 100°) of the Pacific-Nazca plates. The extension of this seamount chain into the southwestern edge of the Easter microplate near 26°30′ S–115° W was surveyed and sampled. The southern boundary including the Orongo fracture zone and other shallow ridges (〈 2000 m high) bounding the Southwest Rift of the microplate consists of fault scarps where pillow lava, dolerite, and metabasalts are exposed. The degree of rock alternation inferred from palagonitization of glassy margins suggests that the volcanic ridges are as old as the shallow ridges bounding the Southwest Rift of the microplate. The volcanics found on the various structures west of the microplate consist of depleted (K/Ti 〈 0.1), transitional (K/Ti = 0.11−0.25) and enriched (K/Ti 〉 0.25) MORBs which are similar in composition to other more recent basalts from the Southwest and East Rifts spreading axes of the Easter microplate. Incompatible element ratios normalized to chondrite values [(Ce/Yb)N = 1−2.5}, {(La/Sm)N = 0.4−1.2} and {(Zr/Y)N = 0.7−2.5} of the basalts are also similar to present day volcanism found in the Easter microplate. The volcanics from the Easter microplate-Crough region are unrelated to other known South Pacific intraplate magmatism (i.e. Society, Pitcairn, and Salas y Gomez Islands). Instead their range in incompatible element ratios is comparable to the submarine basalts from the recently investigated Ahu and Umu volcanic field (Easter hotspot) (Scientific Party SO80, 1993) and centered at about 80 km west of Easter Island. The oblique ridges and their associated seamounts are likely to represent ancient leaky transform faults created during the initial stage of the Easter microplate formation (≈ 5 Ma). It appears that volcanic activity on seamounts overlying the oblique volcanic ridges has continued during their westward drift from the microplate as shown by the presence of relatively fresh lava observed on one of these structures, namely the first Oblique Volcanic Ridge near 25° S–118° W at about 160 km west of the Easter microplate West Rift. Based on a reconstruction of the Easter microplate, it is suggested that the Crough seamount (〈 800 m depth) was formed by earlier (7–10 Ma) hotspot magmatic activity which also created Easter Island.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01227041
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Hole 956B: Downhole FMS mesurements in the southern volcanic apron of Gran Canaria, central Atlantic (1998)
    Ocean Drilling Program
    In:  In: Proceedings of the ODP, Scientific Results, 157. , ed. by Weaver, P. P. E., Schmincke, H. U. and Firth, J. Ocean Drilling Program, College Station, Texas, USA, pp. 39-46.
    Details
    Publication Date: 2014-02-10
    Type: Book chapter , NonPeerReviewed
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    OceanRep: Book chapter
  • 4
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    The Foundation Seamount chain: a first survey and sampling (1997)
    Elsevier
    In:  Marine Geology, 137 (3-4). pp. 191-200.
    Details
    Publication Date: 2017-06-23
    Description: The Foundation Seamounts form a 1400 km-long chain on the Pacific plate from 32 °S, 127 °W to the Pacific-Antarctic spreading axis at 38 °S, 111 °W. Previously only known from sparse single-beam echosoundings and satellite altimetry, we present here the first multibeam bathymetric survey and geological sampling results. We confirm that the submarine topography correlates with the altimetry, and that the chain is volcanic rather than tectonic or microcontinental in origin. The chain can be divided up morphologically and geochemically into three section: (1) west of 125 °W large flat-topped volcanoes composed of incompatible-element depleted lavas ( ≈ 1) of a near-ridge origin with little or no plume influence, (2) between 125 and 115 °W true intraplate volcanoes with incompatible element enrichment ( 〉 1.9) generated over the Foundation plume, (3) east of 115 °W E-W-trending volcanic ridges with compositions ( 2.0-0.3) suggestive of interaction between the plume and the Pacific-Antarctic spreading axis. On the spreading axis moderate incompatible element enrichments ( ≈0.8, cf. ≈ 0.3 outside the Foundation area) also suggest plume influence. It appears that the activity of the Foundation plume in the last few million years has (1) significantly waned and (2) become wholly channeled towards the spreading axis. The Foundation plume may be in the process of “dying”.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0025-3227(96)00104-1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Unknown
    Magmatic evolution of the Easter Microplate - Crough Seamount region (Southwest Pacific) (1995)
    Springer
    In:  Marine Geophysical Research, 17 (4). pp. 375-397.
    Details
    Publication Date: 2017-06-22
    Description: The Easter microplate-Crough Seamount region located between 25° S–116° W and 25° S–122° W consists of a chain of seamounts forming isolated volcanoes and elongated (100–200 km in length) en echelon volcanic ridges oriented obliquely NE (N 065°), to the present day general spreading direction (N 100°) of the Pacific-Nazca plates. The extension of this seamount chain into the southwestern edge of the Easter microplate near 26°30′ S–115° W was surveyed and sampled. The southern boundary including the Orongo fracture zone and other shallow ridges (〈 2000 m high) bounding the Southwest Rift of the microplate consists of fault scarps where pillow lava, dolerite, and metabasalts are exposed. The degree of rock alternation inferred from palagonitization of glassy margins suggests that the volcanic ridges are as old as the shallow ridges bounding the Southwest Rift of the microplate. The volcanics found on the various structures west of the microplate consist of depleted (K/Ti 〈 0.1), transitional (K/Ti = 0.11−0.25) and enriched (K/Ti 〉 0.25) MORBs which are similar in composition to other more recent basalts from the Southwest and East Rifts spreading axes of the Easter microplate. Incompatible element ratios normalized to chondrite values [(Ce/Yb)N = 1−2.5}, {(La/Sm)N = 0.4−1.2} and {(Zr/Y)N = 0.7−2.5} of the basalts are also similar to present day volcanism found in the Easter microplate. The volcanics from the Easter microplate-Crough region are unrelated to other known South Pacific intraplate magmatism (i.e. Society, Pitcairn, and Salas y Gomez Islands). Instead their range in incompatible element ratios is comparable to the submarine basalts from the recently investigated Ahu and Umu volcanic field (Easter hotspot) (Scientific Party SO80, 1993) and centered at about 80 km west of Easter Island. The oblique ridges and their associated seamounts are likely to represent ancient leaky transform faults created during the initial stage of the Easter microplate formation (≈ 5 Ma). It appears that volcanic activity on seamounts overlying the oblique volcanic ridges has continued during their westward drift from the microplate as shown by the presence of relatively fresh lava observed on one of these structures, namely the first Oblique Volcanic Ridge near 25° S–118° W at about 160 km west of the Easter microplate West Rift. Based on a reconstruction of the Easter microplate, it is suggested that the Crough seamount (〈 800 m depth) was formed by earlier (7–10 Ma) hotspot magmatic activity which also created Easter Island.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/BF01227041
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    (Table 2.1) Morphology of the Foundation Seamounts, Sonne cruise SO100
    PANGAEA
    In:  Geologisch-Paläontologisches Institut, Christian-Albrechts-Universität, Kiel
    Details
    Publication Date: 2023-05-12
    Keywords: 10; 11; 12A; 12B; 13a; 13b; 14; 15; 16; 17; 18; 19A; 19B; 19C; 1A; 1B; 2; 20; 21A; 21B; 22; 23; 24a; 24b; 25; 26; 27A; 27B; 28; 29; 3; 30; 31; 32; 33; 34; 35; 36; 37a; 37b; 38; 39; 40; 41; 42; 43; 44; 4a; 4b; 4c; 5; 6; 7; 8; 9; Description; Diameter; Elevation, maximum; Elevation, minimum; Event label; FOUNDATION; Gravity; Height above sea floor/altitude; Identification; Latitude of event; Longitude of event; MULT; Multiple investigations; Ratio; SO100; SO100_Seam10; SO100_Seam11; SO100_Seam12A; SO100_Seam12B; SO100_Seam13a; SO100_Seam13b; SO100_Seam14; SO100_Seam15; SO100_Seam16; SO100_Seam17; SO100_Seam18; SO100_Seam19A; SO100_Seam19B; SO100_Seam19C; SO100_Seam1A; SO100_Seam1B; SO100_Seam2; SO100_Seam20; SO100_Seam21A; SO100_Seam21B; SO100_Seam22; SO100_Seam23; SO100_Seam24a; SO100_Seam24b; SO100_Seam25; SO100_Seam26; SO100_Seam27A; SO100_Seam27B; SO100_Seam28; SO100_Seam29; SO100_Seam3; SO100_Seam30; SO100_Seam31; SO100_Seam32; SO100_Seam33; SO100_Seam34; SO100_Seam35; SO100_Seam36; SO100_Seam37a; SO100_Seam37b; SO100_Seam38; SO100_Seam39; SO100_Seam40; SO100_Seam41; SO100_Seam42; SO100_Seam43; SO100_Seam44; SO100_Seam4a; SO100_Seam4b; SO100_Seam4c; SO100_Seam5; SO100_Seam6; SO100_Seam7; SO100_Seam8; SO100_Seam9; Sonne; South Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 445 data points
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    DATA PANGAEA
  • 7
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    Annotated record of the detailed examination of Mn deposits from the 1993 R/V Sonne SO-84 expedition in the Atlantic Ocean (1993)
    PANGAEA
    In:  Supplement to: Devey, Colin W; Ackermand, Dietrich; Binard, Nicolas; Chmarzynski, P; Franke-Bruckmaier, B; Geldmacher, Jörg; Graupner, T; Haake, F W; Haase, Karsten M; Hemond, Christophe; Krüger, O; Mühlhan, Norbert; O'Connor, John; Ott, S; Peucker-Ehrenbrink, Bernhard; Pototzki, Frank; Segl, Monika; Tichomirov, W (1993): Cruise report SO-84: The St Helena hotspot - Las Palmas-Cape Town 02.01.93-20.02.93. Berichte - Reports, Geologisch-Paläontologisches Institut und Museum, Christian-Albrechts-Universität, Kiel; 64; 1-103; ISSN 0175-9302, TIB - Technische Informationsbibliothek Universitätsbibliothek Hannover, Berichte-Reports, Geologisch-Paläontologisches Institut der Universität Kiel, 64, 103 pp, https://doi.org/10.2312/reports-gpi.1993.64
    Details
    Publication Date: 2024-02-03
    Description: The SO-84 cruise from Las Palmas to Cape Town studied the underwater volcanism associated with the St Helena hotspot. Wide-spaced grid mapping of a region south and west of St Helena island identified three previously unknown hotspot volcanoes (which we named Josephine 16°27'S-9°W, Jade 16°13'S-7°46'W and Benjamin 16°12'S-8°31'W) and several older, probably near-ridge-generated seamounts. The newly discovered hotspot seamounts, and the previously-known seamounts of Bagration, Bonaparte and Kutuzov were mapped and sampled. Onboard geochemical studies confirm that they all show trace-element (Rb, Nb, Y, Zr, Sr) enriched, hotspot magma-type compositions. Morphological studies and the state of the samples collected from the seamounts (all have at least 1 mm-thick Mn crusts) suggest that none of the volcanoes is presently active, and that the St Helena hotspot is probably extinct at the present time. Josephine appears to be the youngest volcano, and one dredge here yielded fossil hydrothermal material (Fe-hydroxides). To test the hypothesis that the extinction of the hotspot is due to its magmas being channelled to the Mid-Atlantic Ridge, several dredges were taken on the ridge opposite St Helena. Furthermore, in the proposed influence zone of the St Helena plume head, Grattan seamount (9°44'S-12°48'W) was also sampled to examine whether its composition has been affected by the St Helena plume. During the transit from Las Palmas to St Helena, several sediment cores were taken in 3000 m water depth close to the ridge axis for palaeoclimatological work.
    Keywords: 12DS; 13DS; 14DS; 1DS; 20DS; 21DS; 22DS; 23DS; 24DS; 25DS; 26DS; 27DS; 31DS; 35DS; 37DS; 42DS; 43DS; 44DS; 47DS; 49DS; 53DS; 54DS; 55DS; 59DS; 60DS; 63DS; 64DS; 65DS; 68DS; 69DS; 71DS; 72DS; 74DS; 7DS; 83DS; Comment; Deposit type; DEPTH, sediment/rock; Description; Dredge; DRG; Event label; GIK/IfG; GIK17835-1; GIK17841-1; GIK17846-1; GIK17847-1; GIK17848-1; GIK17854-1; GIK17855-1; GIK17856-1; GIK17857-1; GIK17858-1; GIK17859-1; GIK17860-1; GIK17861-1; GIK17865-1; GIK17869-1; GIK17871-1; GIK17876-1; GIK17877-1; GIK17878-1; GIK17881-1; GIK17883-1; GIK17887-1; GIK17888-1; GIK17889-1; GIK17893-1; GIK17894-1; GIK17897-1; GIK17898-1; GIK17899-1; GIK17902-1; GIK17903-1; GIK17905-1; GIK17906-1; GIK17908-1; GIK17917-1; Identification; Institute for Geosciences, Christian Albrechts University, Kiel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sediment type; Size; SO84; Sonne; South Atlantic; ST. HELENA HOTSPOT; Substrate type; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 725 data points
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    DATA PANGAEA
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