Thermo‐mechanical modeling of the Tyrrhenian Sea: Lithospheric necking and kinematics of rifting

Thermo‐mechanical modeling of the Tyrrhenian Sea: Lithospheric necking and kinematics of rifting We present the results of quantitative forward modeling of the Sardinian rifted margin of the Tyrrhenian Sea. The purpose of this study is to investigate the thermo‐mechanical structure that affects the thinning of the lithosphere across the margin. The role of lithospheric necking during basin formation, constrained by basement topography, Moho depth, and gravity anomalies, is modeled for different compensation models. Independent constraints are obtained from the analysis of the predicted thermal structure. A deep level of necking (25 km) is required to explain the observed crustal geometries and gravity anomaly signature. The model predicts spatial and temporal variations in rheology during extension with important implications for kinematics of lithospheric thinning. Prerift lithospheric conditions, strain rate, and temperature during extension appear to be the key controls on the style of lithospheric rifting and necking in the Tyrrhenian Sea. A forward model for basin stratigraphy is presented for the polyphase history of the Tyrrhenian rifting. This model provides quantitative estimates of time‐space dependent crustal thinning and rates of extension. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tectonics Wiley

Thermo‐mechanical modeling of the Tyrrhenian Sea: Lithospheric necking and kinematics of rifting

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Publisher
Wiley
Copyright
Copyright © 1995 by the American Geophysical Union.
ISSN
0278-7407
eISSN
1944-9194
DOI
10.1029/95TC00207
Publisher site
See Article on Publisher Site

Abstract

We present the results of quantitative forward modeling of the Sardinian rifted margin of the Tyrrhenian Sea. The purpose of this study is to investigate the thermo‐mechanical structure that affects the thinning of the lithosphere across the margin. The role of lithospheric necking during basin formation, constrained by basement topography, Moho depth, and gravity anomalies, is modeled for different compensation models. Independent constraints are obtained from the analysis of the predicted thermal structure. A deep level of necking (25 km) is required to explain the observed crustal geometries and gravity anomaly signature. The model predicts spatial and temporal variations in rheology during extension with important implications for kinematics of lithospheric thinning. Prerift lithospheric conditions, strain rate, and temperature during extension appear to be the key controls on the style of lithospheric rifting and necking in the Tyrrhenian Sea. A forward model for basin stratigraphy is presented for the polyphase history of the Tyrrhenian rifting. This model provides quantitative estimates of time‐space dependent crustal thinning and rates of extension.

Journal

TectonicsWiley

Published: Jun 1, 1995

References

  • Structural evolution of the "41st parallel zone": Tyrrhenian Sea
    Spadini, Spadini; Wezel, Wezel
  • The rifting of the Tyrrhenian Basin
    Trincardi, Trincardi; Zitellini, Zitellini

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