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
Distributed deformation ahead of the Cocos-Nazca Rift at the Galapagos triple junction
Authors
Bird
Caress
+23 more
Deborah K. Smith
Engels
Erdogan
Hanna
Hans Schouten
Johnson R. Cann
Klein
Laurent G. J. Montési
Lonsdale
Lonsdale
Lonsdale
McKenzie
Mitchell
Mitchell
Pollard
Ryan
Sauter
Schouten
Schouten
Searle
Wen-lu Zhu
Wessel
Zonenshain
Publication date
8 November 2011
Publisher
'American Geophysical Union (AGU)'
Doi
Cite
Abstract
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 Geochemistry Geophysics Geosystems 12 (2011): Q11003, doi:10.1029/2011GC003689.The Galapagos triple junction is not a simple ridge-ridge-ridge (RRR) triple junction. The Cocos-Nazca Rift (C-N Rift) tip does not meet the East Pacific Rise (EPR). Instead, two secondary rifts form the link: Incipient Rift at 2°40′N and Dietz Deep volcanic ridge, the southern boundary of the Galapagos microplate (GMP), at 1°10′N. Recently collected bathymetry data are used to investigate the regional tectonics prior to the establishment of the GMP (∼1.5 Ma). South of C-N Rift a band of northeast-trending cracks cuts EPR-generated abyssal hills. It is a mirror image of a band of cracks previously identified north of C-N Rift on the same age crust. In both areas, the western ends of the cracks terminate against intact abyssal hills suggesting that each crack initiated at the EPR spreading center and cut eastward into pre-existing topography. Each crack formed a short-lived triple junction until it was abandoned and a new crack and triple junction initiated nearby. Between 2.5 and 1.5 Ma, the pattern of cracking is remarkably symmetric about C-N Rift providing support for a crack interaction model in which crack initiation at the EPR axis is controlled by stresses associated with the tip of the westward-propagating C-N Rift. The model also shows that offsets of the EPR axis may explain times when cracking is not symmetric. South of C-N Rift, cracks are observed on seafloor as old as 10.5 Ma suggesting that this triple junction has not been a simple RRR triple junction during that time.HS was supported by the U.S. National Science Foundation (NSF) grant OCE‐0751831, DS by NSF grant OCE‐1028537, WZ by NSF grant EAR‐1056317, and LM by NSF grant EAR‐0911151.2012-05-0
Similar works
Full text
Open in the Core reader
Download PDF
Available Versions
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 08/06/2012
Crossref
See this paper in CORE
Go to the repository landing page
Download from data provider
info:doi/10.1029%2F2011gc00368...
Last time updated on 01/04/2019