Evidence from gravity data for focused magmatic accretion along the Mid-Atlantic Ridge

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doi: 10.1038/344627a0
Authors:Lin, J.; Purdy, G. M.; Schouten, Hans; Sempere, Jean-Christophe; Zervas, C.
Author Affiliations:Primary:
Woods Hole Oceanogr. Inst., Dep. Geol. and Geophys., Woods Hole, MA, United States
Other:
Univ. Wash., United States
Volume Title:Nature (London)
Source:Nature (London), 344(6267), p.627-632. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836
Publication Date:1990
Note:In English. 27 refs.; illus. incl. sketch maps
Summary:The results of an extensive Sea Beam bathymetric, gravity and magnetic survey of a 300 km-long section of the MAR, including the Atlantis transform (27 degrees 50 minutes N - 30 degrees 40 minutes N) are presented. Gravity data show that accretion of magma at the MAR is focused at discrete centres along the spreading axis. Large positive gravity anomalies equivalent to reductions of approx 50% of crustal thickness (>3 km) occur over non-transform discontinuities bounding spreading segments. Minor non-transform disontinuities along the MAR rift valley do not just represent surficial, en-echelon cracks, but are fundamental divisions of the magmatic, crust-generating processes. [R.K.H.]
Subjects:Accretion; Bathymetry; Bouguer anomalies; Crust; Free-air anomalies; Geophysical methods; Geophysical surveys; Gravity anomalies; Gravity methods; Magma chambers; Magmas; Magnetic methods; Mid-ocean ridges; Oceanic crust; Sea-floor spreading; Seabeam; Surveys; Tectonophysics; Thickness; Atlantic Ocean; Mid-Atlantic Ridge; Evolution
Abstract Numbers:90M/4958
Record ID:1990031430
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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