About This Item
- Full TextFull Text(subscription required)
- Pay-Per-View PurchasePay-Per-View
Purchase Options Explain
Share This Item
The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
2004. The American Association of Petroleum Geologists. All rights reserved.
Plots of Crestal Structural Relief and Fold Area versus Shortening—A Graphical Technique to Unravel the Kinematics of Thrust-related Folds
J. Poblet,1 M. Bulnes,1 K. McClay,2 S. Hardy3
1Departamento de Geologa, Universidad de Oviedo, Oviedo, Spain
2Fault Dynamics Research Group, Department of Geology, Royal Holloway University of London, Egham, Surrey, U.K.
3Department of Earth Sciences, The University of Manchester, Manchester, U.K.
ACKNOWLEDGMENTS
Suggestions by R. Groshong and an anonymous referee substantially improved the original manuscript. F. Bastida, J. Aller, J.L. Alonso, and A. Marcos are also thanked for their comments. We acknowledge financial support by Projects AMB98-1012-CO2-O2 (Actividad sismotectnica, estructura litosf
rica y modelos de deformaci
n varisca y alpina en el NO de la Pen
nsula Ib
rica) and PB98-1557 (Mecanismos de plegamiento: teor
a y aplicaciones en geolog
a econ
mica y regional) funded by the Spanish Ministry for Education and Culture, and support by the Acci
n Integrada Hispano-Brit
nica HB1999-0038 (Cinem
tica de pliegues y estructuras menores asociadas a cabalgamientos a partir del estudio de materiales sintect
nicos y de su modelizaci
n) funded by the Spanish Ministry for Education and Culture and the British Council.
ABSTRACT
A new method is presented for unraveling some aspects of the kinematic evolution of thrust-related folds. This technique consists of measuring crestal structural relief, shortening, and the area of a fold for different amplification stages, and then plotting the crestal structural relief and the fold area versus the shortening. One of the main advantages of this technique is that the data can be obtained from different sources: a section
across a fold with associated syntectonic sediments, different sections across a fold that underwent a lateral shortening gradient, or different sections across a fold at different amplification stages. This technique has been applied to theoretical, natural, and experimental thrust-related folds. The analyses carried out show that each fold had a different kinematic evolution. They show also that, except for the theoretical examples, the kinematic evolution may be very complex, because different folding mechanisms may operate during fold amplification and increases/decreases of fold area and thickening/thinning of beds may occur. Therefore, to model or sequentially restore natural/experimental thrust-related folds, we recommend the application of techniques such as the one we propose here, when possible. This would avoid the automatic application of forward models based on kinematic assumptions and geometric resemblance between the model and the actual example.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
Watermarked PDF Document: $14 | |
Open PDF Document: $24 |