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

D. K. Blackman, B. Ildefonse, B. E. John, Y. Ohara, D. J. Miller, N. Abe, M. Abratis, E. S. Andal, M. Andreani, S. Awaji, J. S. Beard, D. Brunelli, A. B. Charney, D. M. Christie, J. Collins, A. G. Delacour, H. Delius, M. Drouin, F. Einaudi, J. EscartínB. R. Frost, G. Früh-Green, P. B. Fryer, J. S. Gee, M. Godard, C. B. Grimes, A. Halfpenny, H. E. Hansen, A. C. Harris, A. Tamura, N. W. Hayman, E. Hellebrand, T. Hirose, J. G. Hirth, S. Ishimaru, K. T M Johnson, G. D. Karner, M. Linek, C. J. MacLeod, J. Maeda, O. U. Mason, A. M. McCaig, K. Michibayashi, A. Morris, T. Nakagawa, Toshio Nozaka, M. Rosner, R. C. Searle, G. Suhr, M. Tominaga, A. Von Der Handt, T. Yamasaki, X. Zhao

Research output: Contribution to journalArticle

54 Citations (Scopus)

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.

Original languageEnglish
Article numberB07103
JournalJournal of Geophysical Research B: Solid Earth
Volume116
Issue number7
DOIs
Publication statusPublished - Jul 1 2011

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Domes
domes
drilling
dome
ridges
Drilling
accretion
Lithology
lithology
detachment
Zeolites
expeditions
Faulting
unroofing
serpentinization
ground truth
peridotite
greenschist
capping
granulite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid-Atlantic Ridge 30N. / Blackman, D. K.; Ildefonse, B.; John, B. E.; Ohara, Y.; Miller, D. J.; Abe, N.; Abratis, M.; Andal, E. S.; Andreani, M.; Awaji, S.; Beard, J. S.; Brunelli, D.; Charney, A. B.; Christie, D. M.; Collins, J.; Delacour, A. G.; Delius, H.; Drouin, M.; Einaudi, F.; Escartín, J.; Frost, B. R.; Früh-Green, G.; Fryer, P. B.; Gee, J. S.; Godard, M.; Grimes, C. B.; Halfpenny, A.; Hansen, H. E.; Harris, A. C.; Tamura, A.; Hayman, N. W.; Hellebrand, E.; Hirose, T.; Hirth, J. G.; Ishimaru, S.; Johnson, K. T M; Karner, G. D.; Linek, M.; MacLeod, C. J.; Maeda, J.; Mason, O. U.; McCaig, A. M.; Michibayashi, K.; Morris, A.; Nakagawa, T.; Nozaka, Toshio; Rosner, M.; Searle, R. C.; Suhr, G.; Tominaga, M.; Von Der Handt, A.; Yamasaki, T.; Zhao, X.

In: Journal of Geophysical Research B: Solid Earth, Vol. 116, No. 7, B07103, 01.07.2011.

Research output: Contribution to journalArticle

Blackman, DK, Ildefonse, B, John, BE, Ohara, Y, Miller, DJ, Abe, N, Abratis, M, Andal, ES, Andreani, M, Awaji, S, Beard, JS, Brunelli, D, Charney, AB, Christie, DM, Collins, J, Delacour, AG, Delius, H, Drouin, M, Einaudi, F, Escartín, J, Frost, BR, Früh-Green, G, Fryer, PB, Gee, JS, Godard, M, Grimes, CB, Halfpenny, A, Hansen, HE, Harris, AC, Tamura, A, Hayman, NW, Hellebrand, E, Hirose, T, Hirth, JG, Ishimaru, S, Johnson, KTM, Karner, GD, Linek, M, MacLeod, CJ, Maeda, J, Mason, OU, McCaig, AM, Michibayashi, K, Morris, A, Nakagawa, T, Nozaka, T, Rosner, M, Searle, RC, Suhr, G, Tominaga, M, Von Der Handt, A, Yamasaki, T & Zhao, X 2011, 'Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid-Atlantic Ridge 30N', Journal of Geophysical Research B: Solid Earth, vol. 116, no. 7, B07103. https://doi.org/10.1029/2010JB007931
Blackman, D. K. ; Ildefonse, B. ; John, B. E. ; Ohara, Y. ; Miller, D. J. ; Abe, N. ; Abratis, M. ; Andal, E. S. ; Andreani, M. ; Awaji, S. ; Beard, J. S. ; Brunelli, D. ; Charney, A. B. ; Christie, D. M. ; Collins, J. ; Delacour, A. G. ; Delius, H. ; Drouin, M. ; Einaudi, F. ; Escartín, J. ; Frost, B. R. ; Früh-Green, G. ; Fryer, P. B. ; Gee, J. S. ; Godard, M. ; Grimes, C. B. ; Halfpenny, A. ; Hansen, H. E. ; Harris, A. C. ; Tamura, A. ; Hayman, N. W. ; Hellebrand, E. ; Hirose, T. ; Hirth, J. G. ; Ishimaru, S. ; Johnson, K. T M ; Karner, G. D. ; Linek, M. ; MacLeod, C. J. ; Maeda, J. ; Mason, O. U. ; McCaig, A. M. ; Michibayashi, K. ; Morris, A. ; Nakagawa, T. ; Nozaka, Toshio ; Rosner, M. ; Searle, R. C. ; Suhr, G. ; Tominaga, M. ; Von Der Handt, A. ; Yamasaki, T. ; Zhao, X. / Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid-Atlantic Ridge 30N. In: Journal of Geophysical Research B: Solid Earth. 2011 ; Vol. 116, No. 7.
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AU - Blackman, D. K.

AU - Ildefonse, B.

AU - John, B. E.

AU - Ohara, Y.

AU - Miller, D. J.

AU - Abe, N.

AU - Abratis, M.

AU - Andal, E. S.

AU - Andreani, M.

AU - Awaji, S.

AU - Beard, J. S.

AU - Brunelli, D.

AU - Charney, A. B.

AU - Christie, D. M.

AU - Collins, J.

AU - Delacour, A. G.

AU - Delius, H.

AU - Drouin, M.

AU - Einaudi, F.

AU - Escartín, J.

AU - Frost, B. R.

AU - Früh-Green, G.

AU - Fryer, P. B.

AU - Gee, J. S.

AU - Godard, M.

AU - Grimes, C. B.

AU - Halfpenny, A.

AU - Hansen, H. E.

AU - Harris, A. C.

AU - Tamura, A.

AU - Hayman, N. W.

AU - Hellebrand, E.

AU - Hirose, T.

AU - Hirth, J. G.

AU - Ishimaru, S.

AU - Johnson, K. T M

AU - Karner, G. D.

AU - Linek, M.

AU - MacLeod, C. J.

AU - Maeda, J.

AU - Mason, O. U.

AU - McCaig, A. M.

AU - Michibayashi, K.

AU - Morris, A.

AU - Nakagawa, T.

AU - Nozaka, Toshio

AU - Rosner, M.

AU - Searle, R. C.

AU - Suhr, G.

AU - Tominaga, M.

AU - Von Der Handt, A.

AU - Yamasaki, T.

AU - Zhao, X.

PY - 2011/7/1

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N2 - 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.

AB - 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.

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