Skip navigation
Skip navigation
The system will be down for maintenance between 8:00 and 8:15am on Thursday 13, December 2018

Stirring in three-dimensional mantle convection models and implications for geochemistry: Passive tracers

Huang, Jinshui; Davies, Geoffrey

Description

Numerical three-dimensional spherical models of stirring of passive tracers in a convective mantle incorporating plate tectonics, taking account of faster mantle overturning in the past and scaling the model to the Earth, show that the mean ages of MORB and OIB samples obtained from the models are ∼1.7 Ga for a 4.5 Ga Earth, close to the observed apparent lead isotopic age of ∼1.8 Ga. Only ∼3% of the mantle remains unprocessed. The processing time, which is the time for a mass equivalent to...[Show more]

dc.contributor.authorHuang, Jinshui
dc.contributor.authorDavies, Geoffrey
dc.date.accessioned2015-12-07T22:21:09Z
dc.identifier.issn1525-2027
dc.identifier.urihttp://hdl.handle.net/1885/19911
dc.description.abstractNumerical three-dimensional spherical models of stirring of passive tracers in a convective mantle incorporating plate tectonics, taking account of faster mantle overturning in the past and scaling the model to the Earth, show that the mean ages of MORB and OIB samples obtained from the models are ∼1.7 Ga for a 4.5 Ga Earth, close to the observed apparent lead isotopic age of ∼1.8 Ga. Only ∼3% of the mantle remains unprocessed. The processing time, which is the time for a mass equivalent to Earth's mantle to be processed through melting zones, is equal to the value estimated for the Earth (2.9 Ga). These results are consistent with previous results from two-dimensional models. A simple physical processing theory reveals that the degree of processing, the residence time of tracers in the mantle, and their age distribution are mainly controlled by the processing time. Comparison with analogous two-dimensional Cartesian models shows that the geometry, viscosity structure, and vigor of convection have only secondary influence on these results.
dc.publisherAmerican Geophysical Union
dc.sourceGeochemistry, Geophysics, Geosystems. G3
dc.subjectKeywords: 3-D spherical model; Geochemical heterogeneity; Mantle convection; Mantle degassing; Mantle stirring; Thermal-chemical convection
dc.titleStirring in three-dimensional mantle convection models and implications for geochemistry: Passive tracers
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume8
dc.date.issued2007
local.identifier.absfor040299 - Geochemistry not elsewhere classified
local.identifier.absfor040403 - Geophysical Fluid Dynamics
local.identifier.ariespublicationU4278572xPUB10
local.type.statusPublished Version
local.contributor.affiliationHuang, Jinshui, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationDavies, Geoffrey, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue3
local.bibliographicCitation.startpageQ03017
local.identifier.doi10.1029/2006GC001312
dc.date.updated2016-02-24T10:48:11Z
local.identifier.scopusID2-s2.0-71749105556
CollectionsANU Research Publications

Download

File Description SizeFormat Image
01_Huang_Stirring_in_three-dimensional_2007.pdf697.89 kBAdobe PDF    Request a copy


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  27 November 2018/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator