Journal ArticleDOI
Emplacement of deep crustal and mantle rocks on the west median valley wall of the MARK area (MAR, 23°N)
TLDR
In this article, the Nautile explored the western axial valley wall in the northern cell of the MARK area (Mid-Atlantic Ridge/Kane fracture zone), where peridotite and gabbro outcrops had been previously reported, in order to constrain the structure and determine emplacement mechanisms.About:
This article is published in Tectonophysics.The article was published on 1991-04-20. It has received 150 citations till now. The article focuses on the topics: Oceanic core complex & Peridotite.read more
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Journal ArticleDOI
Emplacement of mantle rocks in the seafloor at mid-ocean ridges
TL;DR: In this article, the authors discuss the geological and geophysical data available on mid-ocean ridges with outcrops of serpentinized mantle peridotites, with the objective of better constraining the modes of emplacement of these rocks in the seafloor.
Journal ArticleDOI
Volcanoes, Fluids, and Life at Mid-Ocean Ridge Spreading Centers
TL;DR: The recent recognition of a potentially vast unexplored hot microbial biosphere associated with active volcanism along the global mid-ocean ridge network has fundamentally shifted concepts of how planets and life coevolve.
Journal ArticleDOI
A geological model for the structure of ridge segments in slow spreading ocean crust
Brian E. Tucholke,Jian Lin +1 more
TL;DR: In this article, the authors analyzed available morphological, gravity, and rock sample data from the Atlantic Ocean to determine whether consistent structural patterns occur at these discontinuities and to constrain the processes that control the patterns.
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Seawater-peridotite interactions: First insights from ODP Leg 209, MAR 15°N
TL;DR: In this paper, the results of a petrographic study of hydrothermally altered peridotites drilled during Ocean Drilling Program (ODP) Leg 209 in the 15°20′N fracture Zone area on the Mid-Atlantic Ridge (MAR) were presented.
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How thick is the magmatic crust at slow spreading oceanic ridges
TL;DR: In this article, a geological model is proposed for the lithosphere created in these thick lithosphere/thin crust ridge regions, which suggests that crustal thicknesses measured in seismic surveys of these regions do not directly reflect the melt production in the asthenosphere beneath the ridge, and part of the crust is made of variably fractured and serpentinized residual ultramafics.
References
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Hydrothermal alteration of a 1 km section through the upper oceanic crust, Deep Sea Drilling Project Hole 504B: Mineralogy, chemistry and evolution of seawater‐basalt interactions
TL;DR: The Deep Sea Drilling Project (DSDP) hole 504B was the first hole to pass through the transition from pillow basalts altered at low temperatures into hydrothermally metamorphosed sheeted dikes as mentioned in this paper.
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A tectonic model for ridge-transform-ridge plate boundaries: implications for the structure of oceanic lithosphere
Paul J. Fox,David G. Gallo +1 more
TL;DR: In this article, the first-order geologic and morphologic relationships at, along and proximal to ridge-transform-ridge plate boundaries are used to construct an empirical and speculative tectonic model.
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Along-axis variations in seafloor spreading in the MARK area
Jeffrey A. Karson,George Thompson,Susan E. Humphris,John M. Edmond,Wilfred B. Bryan,Jeffrey R. Brown,A. T. Winters,Robert A. Pockalny,John F. Casey,A. C. Campbell,Gary P. Klinkhammer,Martin R. Palmer,R. J. Kinzler,Margaret Sulanowska +13 more
TL;DR: In this paper, the authors investigate the style and magnitude of seafloor spreading along the axis of the Mid-Atlantic Ridge and demonstrate dramatic changes in the style of tectonic extension, development of the neovolcanic zone, expression of hydrothermal venting, types oflithologic exposures and morphology of the median valley.
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Tectonics of ridge-transform intersections at the Kane fracture zone
TL;DR: The Kane Transform offsets spreading-center segments of the Mid-Atlantic Ridge by about 150 km at 24° N latitude in terms of its first-order morphological, geological, and geophysical characteristics.
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Alpine Jurassic ophiolites resemble the modern central Atlantic basement
Yves Lagabrielle,Mathilde Cannat +1 more
TL;DR: In this paper, it was shown that the magmatic crust is very thin and locally discontinuous in large areas of the central Atlantic Ocean and that these peculiar aspects of the present-day structure of a slow-spreading major ocean are found in the ophiolites of the western Alps as well as in the Ligurian ophilia of the Apennines.