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  • 1
    Keywords: Geologie ; Mittelozeanischer Rücken ; Deep-sea ecology ; Hydrothermal vents ; Magmatism ; Mid-ocean ridges ; Sea-floor spreading ; Submarine geology
    Description / Table of Contents: Jean-Christophe Sempéré, Brian P. West, and Louis Géli: The Southeast Indian Ridge between 127° and 132°40′E: contrasts in segmentation characteristics and implications for crustal accretion / Geological Society, London, Special Publications, 118:1-15, doi:10.1144/GSL.SP.1996.118.01.01 --- Philippe Blondel: Segmentation of the Mid-Atlantic Ridge south of the Azores, based on acoustic classification of TOBI data / Geological Society, London, Special Publications, 118:17-28, doi:10.1144/GSL.SP.1996.118.01.02 --- Eddie McAllister and Johnson R. Cann: Initiation and evolution of boundary-wall faults along the Mid-Atlantic Ridge, 25–29°N / Geological Society, London, Special Publications, 118:29-48, doi:10.1144/GSL.SP.1996.118.01.03 --- Simon Allerton, Roger C. Searle, and Bramley J. Murton: Bathymetric segmentation and faulting on the Mid-Atlantic Ridge, 24°00′N to 24°40′N / Geological Society, London, Special Publications, 118:49-60, doi:10.1144/GSL.SP.1996.118.01.04 --- Kate Lawson, Roger C. Searle, Julian A. Pearce, Paul Browning, and Pamela Kempton: Detailed volcanic geology of the MARNOK area, Mid-Atlantic Ridge north of Kane transform / Geological Society, London, Special Publications, 118:61-102, doi:10.1144/GSL.SP.1996.118.01.05 --- Rodey Batiza: Magmatic segmentation of mid-ocean ridges: a review / Geological Society, London, Special Publications, 118:103-130, doi:10.1144/GSL.SP.1996.118.01.06 --- C. J. Robinson, R. S. White, M. J. Bickle, and T. A. Minshull: Restricted melting under the very slow-spreading Southwest Indian ridge / Geological Society, London, Special Publications, 118:131-141, doi:10.1144/GSL.SP.1996.118.01.07 --- Stephen J. Edwards, Trevor J. Falloon, John Malpas, and Rolf B. Pedersen: A review of the petrology of harzburgites at Hess Deep and Garrett Deep: implications for mantle processes beneath segments of the East Pacific Rise / Geological Society, London, Special Publications, 118:143-156, doi:10.1144/GSL.SP.1996.118.01.08 --- Rachel M. Haymon: The response of ridge-crest hydrothermal systems to segmented, episodic magma supply / Geological Society, London, Special Publications, 118:157-168, doi:10.1144/GSL.SP.1996.118.01.09 --- C. R. German, L. M. Parson, B. J. Murton, and H. D. Needham: Hydrothermal activity and ridge segmentation on the Mid-Atlantic Ridge: a tale of two hot-spots? / Geological Society, London, Special Publications, 118:169-184, doi:10.1144/GSL.SP.1996.118.01.10 --- C. J. MacLeod and C. E. Manning: Influence of axial segmentation on hydrothermal circulation at fast-spreading ridges: insights from Hess Deep / Geological Society, London, Special Publications, 118:185-198, doi:10.1144/GSL.SP.1996.118.01.11 --- V. V. Zaykov, V. V. Maslennikov, E. V. Zaykova, and R. J. Herrington: Hydrothermal activity and segmentation in the Magnitogorsk-West Mugodjarian zone on the margins of the Urals palaeo-ocean / Geological Society, London, Special Publications, 118:199-210, doi:10.1144/GSL.SP.1996.118.01.12 --- Eve C. Southward, Verena Tunnicliffe, Michael B. Black, David R. Dixon, and Linda R.J. Dixon: Ocean-ridge segmentation and vent tubeworms (Vestimentifera) in the NE Pacific / Geological Society, London, Special Publications, 118:211-224, doi:10.1144/GSL.SP.1996.118.01.13 --- Verena Tunnicliffe, C. Mary R. Fowler, and Andrew G. Mcarthur: Plate tectonic history and hot vent biogeography / Geological Society, London, Special Publications, 118:225-238, doi:10.1144/GSL.SP.1996.118.01.14 --- E. G. Nisbet and C. M. R. Fowler: The hydrothermal imprint on life: did heat-shock proteins, metalloproteins and photosynthesis begin around hydrothermal vents? / Geological Society, London, Special Publications, 118:239-251, doi:10.1144/GSL.SP.1996.118.01.15
    Pages: Online-Ressource (IX, 258 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799721
    Language: English
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  • 2
    Keywords: Ocean Drilling Program ; Meeresgeologie ; Paläoozeanographie ; Meeresboden ; Geologie ; Sedimentologie ; Tektonik ; Ozeanische Erdkruste ; Submarine geology ; Marine Geologie
    Description / Table of Contents: A. Cramp, C. J. MacLeod, S. V. Lee, and E. J. W. Jones: Introduction: recent results from the Ocean Drilling Program / Geological Society, London, Special Publications, 131:vii-xi, doi:10.1144/GSL.SP.1998.131.01.01 --- Palaeoceanographic Issues --- T. J. S. Sykes, J.-Y. Royer, A. T. S. Ramsay, and R. B. Kidd: Southern hemisphere palaeobathymetry / Geological Society, London, Special Publications, 131:1-42, doi:10.1144/GSL.SP.1998.131.01.02 --- T. J. S. Sykes, A. T. S. Ramsay, and R. B. Kidd: Southern hemisphere Miocene bottom-water circulation: a palaeobathymetric analysis / Geological Society, London, Special Publications, 131:43-54, doi:10.1144/GSL.SP.1998.131.01.03 --- Anthony T. S. Ramsay, Christopher W. Smart, and James C. Zachos: A Model of early to middle Miocene Deep Ocean circulation for the Atlantic and Indian Oceans / Geological Society, London, Special Publications, 131:55-70, doi:10.1144/GSL.SP.1998.131.01.04 --- Jochen Erbacher and Jürgen Thurow: Mid-Cretaceous radiolarian zonation for the North Atlantic: an example of oceanographically controlled evolutionary processes in the marine biosphere? / Geological Society, London, Special Publications, 131:71-82, doi:10.1144/GSL.SP.1998.131.01.05 --- Simon K. Haslett and Brian M. Funnell: Low-latitude Plio-Pleistocene temporal abundance variations in the radiolarian Cycladophora davisiana Ehrenberg: stratigraphic and palaeoceanographic significance / Geological Society, London, Special Publications, 131:83-89, doi:10.1144/GSL.SP.1998.131.01.06 --- M. Maslin, M. Sarnthein, J.-J. Knaack, P. Grootes, and C. Tzedakis: Intra-interglacial cold events: an Eemian-Holocene comparison / Geological Society, London, Special Publications, 131:91-99, doi:10.1144/GSL.SP.1998.131.01.07 --- Michael Schaaf and Jürgen Thurow: Two 30 000 year high-resolution greyvalue time series from the Santa Barbara Basin and the Guaymas Basin / Geological Society, London, Special Publications, 131:101-110, doi:10.1144/GSL.SP.1998.131.01.08 --- Mark Maslin: Equatorial western Atlantic Ocean circulation changes linked to the Heinrich events: deep-sea sediment evidence from the Amazon Fan / Geological Society, London, Special Publications, 131:111-127, doi:10.1144/GSL.SP.1998.131.01.09 --- Mark Maslin and Naja Mikkelsen: Timing of the late Quaternary Amazon Fan Complex masstransport deposits / Geological Society, London, Special Publications, 131:129-150, doi:10.1144/GSL.SP.1998.131.01.10 --- Stephen F. Crowley, Dorrik A. V. Stow, and Ian W. Croudace: Mineralogy and geochemistry of Bay of Bengal deep-sea fan sediments, ODP Leg 116: evidence for an Indian subcontinent contribution to distal fan sedimentation / Geological Society, London, Special Publications, 131:151-176, doi:10.1144/GSL.SP.1998.131.01.11 --- Structural, Tectonic and Sedimentary Issues --- Yildirim Dilek: Structure and Tectonics of Intermediate-Spread Oceanic Crust Drilled at DSDP/ODP Holes 504B and 896A, Costa Rica Rift / Geological Society, London, Special Publications, 131:177-197, doi:10.1144/GSL.SP.1998.131.01.12 --- Neil C. Mitchell: Sediment accumulation rates from Deep Tow profiler records and DSDP Leg 70 cores over the Galapagos spreading centre / Geological Society, London, Special Publications, 131:199-209, doi:10.1144/GSL.SP.1998.131.01.13 --- R. G. Rothwell: Sedimentary evidence relating to the tectonic evolution of the Lau Basin, SW Pacific, from ODP Sites 834–839 (ODP Leg 135) / Geological Society, London, Special Publications, 131:211-229, doi:10.1144/GSL.SP.1998.131.01.14 --- Richard A. Hodkinson and David S. Cronan: Hydrothermal inputs at ODP Sites 836, 837, 838 and 839 in relation to Eastern Lau Spreading Centre propagation in the Lau Basin, southwest Pacific / Geological Society, London, Special Publications, 131:231-242, doi:10.1144/GSL.SP.1998.131.01.15 --- A. H. F. Robertson, K.-C. Emeis, C. Richter, M.-M. Blanc-Valleron, I. Bouloubassi, H-J. Brumsack, A. Cramp, G. J. Di Stefano, R. Flecker, E. Frankel, M. W. Howell, T. R. Janecek, M.-J. Jurado, A. E. S. Kemp, I. Koizumi, A. Kopf, C. O. Major, Y. Mart, D. F. C. Pribnow, A. Rabaute, A. P. Roberts, J. Rullkötter, T. Sakamoto, S. Spezzaferri, T. S. Staerker, J. S. Stoner, B. M. Whiting, and J. M. Woodside: Collision-related break-up of a carbonate platform (Eratosthenes Seamount) and mud volcanism on the Mediterranean Ridge: preliminary synthesis and implications of tectonic results of ODP Leg 160 in the Eastern Mediterranean Sea / Geological Society, London, Special Publications, 131:243-271, doi:10.1144/GSL.SP.1998.131.01.16 --- Jane L. Alexander: Rare earth element anomalies in the Nankai accretionary prism, Japan / Geological Society, London, Special Publications, 131:273-285, doi:10.1144/GSL.SP.1998.131.01.17 --- M. A. Lovell, P. K. Harvey, T. S. Brewer, C. Williams, P. D. Jackson, and G. Williamson: Application of FMS images in the Ocean Drilling Program: an overview / Geological Society, London, Special Publications, 131:287-303, doi:10.1144/GSL.SP.1998.131.01.18 --- Yir-Der E. Lee and T. J. G. Francis: A statistical study of hydraulic piston coring, ODP Legs 101–149 / Geological Society, London, Special Publications, 131:305-316, doi:10.1144/GSL.SP.1998.131.01.19 --- Erratum --- Erratum: Mid-Cretaceous radiolarian zonation for the North Atlantic: an example of oceanographically controlled evolutionary processes in the marine biosphere? / Geological Society, London, Special Publications, 131:ERR, doi:10.1144/GSL.SP.1998.131.01.21
    Pages: Online-Ressource (XI, 323 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1862390037
    Language: English
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  • 3
    Publication Date: 2019
    Description: Abstract We describe detailed magnetic and bathymetric studies around 13°N on the Mid‐Atlantic Ridge, a site of extensive detachment faulting. Inversion of closely spaced sea surface magnetic anomalies reveals a disorganized pattern of magnetization, with anomalies younger than anomaly 2 being poorly delineated. The Brunhes anomaly width is highly variable but averages ~60% of that predicted for the regional spreading rate. It is often split, both along and across axis, by apparently reversely magnetized crust. Gaps in the Brunhes anomaly match gaps in the neovolcanic zone inferred from acoustic backscatter. A strong negative magnetization is associated with the oceanic core complex (OCC) at 13°20′N (OCC1320) and is inferred to arise from exhumed old, reversely magnetized lithosphere. The inferred position of the magmatic axis implies ~30% asymmetry of crustal accretion post‐anomaly‐2. Higher spatial resolution magnetic anomalies near the seafloor, measured by autonomous underwater vehicle, are qualitatively similar to earlier deep‐towed data but differ somewhat from the sea surface magnetics. We interpret this mismatch as reflecting the differing sensitivities of the two observing geometries and the existence of a highly heterogeneous topography and magnetization. This suggests that a strongly three‐dimensional structure exists, more compatible with a geodynamic model where neighboring OCCs are not connected but evolve independently. A modeled near‐seafloor profile through OCC1320 shows low positive magnetization below the smooth dome. A second profile, running E‐W between two OCCs, shows high magnetization coinciding with a large seamount, reflecting recent off‐axis volcanism. Measured microbathymetry reveals extensive small volcanic cones on this seamount and confirms previous interpretations of OCC morphology.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 4
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    In:  Eos, Trans., Am. Geophys. Un., Tokyo, Am. Geophys. Union, vol. 80, no. 33, pp. 367, pp. 2163
    Publication Date: 1999
    Keywords: Borehole geophys. ; scientific drilling ; Ocean Drilling Program ; BGS ; Instruments
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  • 5
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    Geological Society, London & Blackwell Scientific Publications
    In:  Bull., Polar Proj. OP-O3A4, Geological Applications of Wireline Logs II, London, Geological Society, London & Blackwell Scientific Publications, vol. 65, no. 4, pp. 235-246, (ISBN 0080419208)
    Publication Date: 1992
    Keywords: Borehole geophys. ; Tectonics ; Dearth Core ; Formation Micro Imager ; Borehole Televiewer ; Deep Sea Drilling Program ; - ; Deep ; Sea ; Drilling ; Project ; 16 ; (Structural ; Geology) ; 20 ; (Geophysics, ; Applied) ; block ; structures ; errors ; instruments ; Lau ; Basin ; Leg ; 135 ; magnetic ; declination ; Ocean ; Drilling ; Program ; Ocean Drilling Program ; Site ; 841 ; orientation ; Pacific ; Ocean ; paleomagnetism ; plate ; rotation ; tectonics
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 348 (1990), S. 717-720 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Southern Troodos transform fault (formerly called the 'Arakapas fault zone'9) is an approximately 5-km-wide oceanic strike-slip fault system trending E-W along the southern margin of the ophiolite9-11. To the south a fragment of crust generated at an 'Anti-Troodos' ridge axis has been ...
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2007-10-08
    Description: A significant problem with basement core data acquired by the Ocean Drilling Program (ODP) is that it is unorientated with respect to grid north and in those cores with < 100% core recovery the data may also be inaccurately located within the borehole. In order for structural data from basement cores to be of any real value, the recovered core must firstly be accurately located and orientated. Here, we develop methods for core reorientation and accurate location within a borehole that integrates wireline borehole electrical images with whole-core digital images. Azimuthal orientation and location of individual core pieces allows for the detailed interpretation of structural data, including fabrics and fractures and reorientation of other spatially anisotropic properties of core, such as palaeomagnetism. ODP Hole 1105A is one of a pair of holes drilled on the Atlantis Bank in the SW Indian Ocean, which penetrate sections of the lower ocean crust. Hole 1105A was drilled to a depth of 158 metres below sea-floor (mbsf), with core recovery of 83% and the vast majority of the recovered material being represented by gabbroic rocks. Zones of crystal-plastic deformation occur throughout the core, but overall their frequency increases downhole. In the deformed zones, the gabbros are transformed into equigranular or porphyroclastic gneissose textured rocks, characterized by very prominent planar fabrics. These localized deformation zones relate to the early exhumation history of the lower crust in an environment similar to core-complex formation in continental regions. Using a combination of digital core and formation microscanner (FMS) images, it is now possible to fully orientate structural features in a borehole and so map the oxide gabbro and crystal-plastic deformation zones in Hole 1105A. From the analysis of the crystal-plastic fabrics, the majority appear to dip southwards, with a few (c.5%) dipping to the north. This would suggest that the major exhumation surfaces in this hole are represented by southward-dipping structures, formed at high temperatures during unroofing of the Atlantis Bank.
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  • 8
    Publication Date: 2008-05-01
    Print ISSN: 0047-2425
    Electronic ISSN: 1537-2537
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 9
    Publication Date: 2010-05-01
    Print ISSN: 0361-5995
    Electronic ISSN: 1435-0661
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 10
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