CORE
🇺🇦
make metadata, not war
Services
Services overview
Explore all CORE services
Access to raw data
API
Dataset
FastSync
Content discovery
Recommender
Discovery
OAI identifiers
OAI Resolver
Managing content
Dashboard
Bespoke contracts
Consultancy services
Support us
Support us
Membership
Sponsorship
Community governance
Advisory Board
Board of supporters
Research network
About
About us
Our mission
Team
Blog
FAQs
Contact us
unknown
Crustal Evolution of the Mid-Atlantic Ridge near the Fifteen-Twenty Fracture Zone in the last 5 Ma
Authors
Blackman
Blackman
+73 more
Bonatti
Bougault
Bougault
Brian E. Tucholke
Buchanan
Buck
Cande
Cann
Cannat
Cannat
Cannat
Cannat
Casey
Casey
Casey
Casey
DeMets
Detrick
Detrick
Dick
Dick
Dosso
Dosso
Escartín
Escartín
Fujiwara
Fujiwara
Grindlay
International Association of Geodesy (IAG)
International Association of Geomagnetism and Aeronomy (IAGA) Division V Working Group 8
Jian Lin
John F. Casey
Karson
Karson
Kelemen
Kuo
Lagabrielle
Lin
Macdonald
MacLeod
Matsumoto
Morris
Müller
Oshida
Pariso
Pariso
Parker
Parsons
Peter B. Kelemen
Peyve
Peyve
Phipps Morgan
Prince
Reid
Roest
Rona
Sandwell
Sleep
Sobolev
Sobolev
Staudacher
Takeshi Matsumoto
Tivey
Toshiya Fujiwara
Tucholke
Tucholke
Tucholke
Weiland
Wernicke
Wessel
Wooldridge
Xia
Xia
Publication date
8 March 2003
Publisher
'American Geophysical Union (AGU)'
Doi
Cite
Abstract
Author Posting. © American Geophysical Union, 2003. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 4 (2003): 1024, doi:10.1029/2002GC000364.The Mid-Atlantic Ridge around the Fifteen-Twenty Fracture Zone is unique in that outcrops of lower crust and mantle rocks are extensive on both flanks of the axial valley walls over an unusually long distance along-axis, indicating a high ratio of tectonic to magmatic extension. On the basis of newly collected multibeam bathymetry, magnetic, and gravity data, we investigate crustal evolution of this unique section of the Mid-Atlantic Ridge over the last 5 Ma. The northern and southern edges of the study area, away from the fracture zone, contain long abyssal hills with small spacing and fault throw, well lineated and high-amplitude magnetic signals, and residual mantle Bouguer anomaly (RMBA) lows, all of which suggest relatively robust magmatic extension. In contrast, crust in two ridge segments immediately north of the fracture zone and two immediately to the south is characterized by rugged and blocky topography, by low-amplitude and discontinuous magnetization stripes, and by RMBA highs that imply thin crust throughout the last 5 Ma. Over these segments, morphology is typically asymmetric across the spreading axis, indicating significant tectonic thinning of crust caused by faults that have persistently dipped in only one direction. North of the fracture zone, however, megamullions are that thought to have formed by slip on long-lived normal faults are found on both ridge flanks at different ages and within the same spreading segment. This unusual partitioning of megamullions can be explained either by a ridge jump or by polarity reversal of the detachment fault following formation of the first megamullion.This work was completed while T. Fujiwara was a Guest Investigator at Woods Hole Oceanographic Institution with funding from Japan Marine Science and Technology Center (JAMSTEC), National Science Foundation, and the JAMSTEC Research Overseas Program. J. Lin’s contributions to this research were supported by NSF Grant OCE-9811924. B. E. Tucholke’s contributions were supported by NSF Grant OCE-9503561 and by the Andrew W. Mellon Endowment Fund for Innovative Research and the Henry Bryant Bigelow Chair at Woods Hole Oceanographic Institution
Similar works
Full text
Open in the Core reader
Download PDF
Available Versions
Crossref
See this paper in CORE
Go to the repository landing page
Download from data provider
Last time updated on 01/04/2019
Woods Hole Open Access Server
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:darchive.mblwhoilibrary.or...
Last time updated on 14/05/2013