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    Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid-Atlantic Ridge 30°N

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    2010JB007931.pdf (5.570Mb)
    Date
    2011-07-19
    Author
    Blackman, Donna K.  Concept link
    Ildefonse, Benoit  Concept link
    John, Barbara E.  Concept link
    Ohara, Y.  Concept link
    Miller, D. J.  Concept link
    Abe, Natsue  Concept link
    Abratis, M.  Concept link
    Andal, E. S.  Concept link
    Andreani, Muriel  Concept link
    Awaji, S.  Concept link
    Beard, J. S.  Concept link
    Brunelli, Daniele  Concept link
    Charney, A. B.  Concept link
    Christie, D. M.  Concept link
    Collins, John A.  Concept link
    Delacour, A. G.  Concept link
    Delius, H.  Concept link
    Drouin, M.  Concept link
    Einaudi, F.  Concept link
    Escartin, Javier E.  Concept link
    Frost, B. R.  Concept link
    Fruh-Green, Gretchen L.  Concept link
    Fryer, P. B.  Concept link
    Gee, Jeffrey S.  Concept link
    Grimes, C. B.  Concept link
    Halfpenny, A.  Concept link
    Hansen, H.-E.  Concept link
    Harris, Amber C.  Concept link
    Tamura, A.  Concept link
    Hayman, Nicholas W.  Concept link
    Hellebrand, Eric  Concept link
    Hirose, T.  Concept link
    Hirth, Greg  Concept link
    Ishimaru, S.  Concept link
    Johnson, Kevin T. M.  Concept link
    Karner, G. D.  Concept link
    Linek, M.  Concept link
    MacLeod, Christopher J.  Concept link
    Maeda, J.  Concept link
    Mason, O..U.  Concept link
    McCaig, A. M.  Concept link
    Michibayashi, K.  Concept link
    Morris, Antony  Concept link
    Nakagawa, T.  Concept link
    Nozaka, Toshio  Concept link
    Rosner, Martin  Concept link
    Searle, Roger C.  Concept link
    Suhr, G.  Concept link
    Tominaga, Masako  Concept link
    von der Handt, A.  Concept link
    Yamasaki, T.  Concept link
    Zhao, Xixi  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4745
    As published
    https://doi.org/10.1029/2010JB007931
    DOI
    10.1029/2010JB007931
    Keyword
     Atlantis Massif; Integrated Ocean Drilling Program; Oceanic Core Complex 
    Abstract
    Expeditions 304 and 305 of the Integrated Ocean Drilling Program cored and logged a 1.4 km section of the domal core of Atlantis Massif. Postdrilling research results summarized here constrain the structure and lithology of the Central Dome of this oceanic core complex. The dominantly gabbroic sequence recovered contrasts with predrilling predictions; application of the ground truth in subsequent geophysical processing has produced self-consistent models for the Central Dome. The presence of many thin interfingered petrologic units indicates that the intrusions forming the domal core were emplaced over a minimum of 100–220 kyr, and not as a single magma pulse. Isotopic and mineralogical alteration is intense in the upper 100 m but decreases in intensity with depth. Below 800 m, alteration is restricted to narrow zones surrounding faults, veins, igneous contacts, and to an interval of locally intense serpentinization in olivine-rich troctolite. Hydration of the lithosphere occurred over the complete range of temperature conditions from granulite to zeolite facies, but was predominantly in the amphibolite and greenschist range. Deformation of the sequence was remarkably localized, despite paleomagnetic indications that the dome has undergone at least 45° rotation, presumably during unroofing via detachment faulting. Both the deformation pattern and the lithology contrast with what is known from seafloor studies on the adjacent Southern Ridge of the massif. There, the detachment capping the domal core deformed a 100 m thick zone and serpentinized peridotite comprises ∼70% of recovered samples. We develop a working model of the evolution of Atlantis Massif over the past 2 Myr, outlining several stages that could explain the observed similarities and differences between the Central Dome and the Southern Ridge.
    Description
    Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 116 (2011): B07103, doi:10.1029/2010JB007931.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Journal of Geophysical Research 116 (2011): B07103
     

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