Formation of volcanic rifted margins: Are temperature anomalies required?

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Standard

Formation of volcanic rifted margins : Are temperature anomalies required? / Nielsen, Thomas K.; Hopper, John R.

I: Geophysical Research Letters, Bind 29, Nr. 21, 01.11.2002, s. 18-1-18-4.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt

Harvard

Nielsen, TK & Hopper, JR 2002, 'Formation of volcanic rifted margins: Are temperature anomalies required?', Geophysical Research Letters, bind 29, nr. 21, s. 18-1-18-4. https://doi.org/10.1029/2002GL015681

APA

Nielsen, T. K., & Hopper, J. R. (2002). Formation of volcanic rifted margins: Are temperature anomalies required? Geophysical Research Letters, 29(21), 18-1-18-4. https://doi.org/10.1029/2002GL015681

Vancouver

Nielsen TK, Hopper JR. Formation of volcanic rifted margins: Are temperature anomalies required? Geophysical Research Letters. 2002 nov. 1;29(21):18-1-18-4. https://doi.org/10.1029/2002GL015681

Author

Nielsen, Thomas K. ; Hopper, John R. / Formation of volcanic rifted margins : Are temperature anomalies required?. I: Geophysical Research Letters. 2002 ; Bind 29, Nr. 21. s. 18-1-18-4.

Bibtex

@article{db76e1ca93b04fe9b0789aa405134339,
title = "Formation of volcanic rifted margins: Are temperature anomalies required?",
abstract = "A major controversy for understanding volcanic margin formation is whether a thermal anomaly in the mantle is required to generate the characteristic thick igneous crust. We use a fluid-dynamical model of mantle flow that includes feedback from melting on the physical properties of the mantle to study the temporal evolution of volcanic margins during continental breakup. We test how weak the mantle must be to induce small-scale convection and thus enhance melt production during breakup. We find that the mantle reference viscosity required to generate a breakup instability is sufficiently low that an unrealistic time dependence develops in the subsequent oceanic spreading system. The viscosity increase associated with dehydration melting can stabilize the system, but only at the expense of eliminating the breakup instability. An exhaustible reservoir of hot mantle resolves this inconsistency. Melt productivity increases through a deepening of the mantle solidus, while a concurrent increase in buoyancy and a decrease in viscosity in the melting region promote an initial transient phase of small-scale convection.",
author = "Nielsen, {Thomas K.} and Hopper, {John R.}",
year = "2002",
month = nov,
day = "1",
doi = "10.1029/2002GL015681",
language = "English",
volume = "29",
pages = "18--1--18--4",
journal = "Geophysical Research Letters (Online)",
issn = "1944-8007",
publisher = "Wiley-Blackwell",
number = "21",

}

RIS

TY - JOUR

T1 - Formation of volcanic rifted margins

T2 - Are temperature anomalies required?

AU - Nielsen, Thomas K.

AU - Hopper, John R.

PY - 2002/11/1

Y1 - 2002/11/1

N2 - A major controversy for understanding volcanic margin formation is whether a thermal anomaly in the mantle is required to generate the characteristic thick igneous crust. We use a fluid-dynamical model of mantle flow that includes feedback from melting on the physical properties of the mantle to study the temporal evolution of volcanic margins during continental breakup. We test how weak the mantle must be to induce small-scale convection and thus enhance melt production during breakup. We find that the mantle reference viscosity required to generate a breakup instability is sufficiently low that an unrealistic time dependence develops in the subsequent oceanic spreading system. The viscosity increase associated with dehydration melting can stabilize the system, but only at the expense of eliminating the breakup instability. An exhaustible reservoir of hot mantle resolves this inconsistency. Melt productivity increases through a deepening of the mantle solidus, while a concurrent increase in buoyancy and a decrease in viscosity in the melting region promote an initial transient phase of small-scale convection.

AB - A major controversy for understanding volcanic margin formation is whether a thermal anomaly in the mantle is required to generate the characteristic thick igneous crust. We use a fluid-dynamical model of mantle flow that includes feedback from melting on the physical properties of the mantle to study the temporal evolution of volcanic margins during continental breakup. We test how weak the mantle must be to induce small-scale convection and thus enhance melt production during breakup. We find that the mantle reference viscosity required to generate a breakup instability is sufficiently low that an unrealistic time dependence develops in the subsequent oceanic spreading system. The viscosity increase associated with dehydration melting can stabilize the system, but only at the expense of eliminating the breakup instability. An exhaustible reservoir of hot mantle resolves this inconsistency. Melt productivity increases through a deepening of the mantle solidus, while a concurrent increase in buoyancy and a decrease in viscosity in the melting region promote an initial transient phase of small-scale convection.

UR - http://www.scopus.com/inward/record.url?scp=0036871241&partnerID=8YFLogxK

U2 - 10.1029/2002GL015681

DO - 10.1029/2002GL015681

M3 - Journal article

AN - SCOPUS:0036871241

VL - 29

SP - 18-1-18-4

JO - Geophysical Research Letters (Online)

JF - Geophysical Research Letters (Online)

SN - 1944-8007

IS - 21

ER -

ID: 355634237