GGG:D30 The Andean Gravity Field, Forward Modelling and Determination of Lithospheric Rigidity

H.-J. Götze; A. Tassara; Z. Tašárová; S. Schmidt; S. Wienecke; R. Hackney

doi:10.1071/ASEG2004ab050

ISSN: 2202-0586
E-ISSN:

oa GGG:D30 The Andean Gravity Field, Forward Modelling and Determination of Lithospheric Rigidity
Authors H.-J. Götze^a, A. Tassara^b, Z. Tašárová^c, S. Schmidt^d, S. Wienecke^e and R. Hackney^f
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^a Institut f Geowissenschaften CAU Kiel, , Germany, [email protected] ^b Institut f Geologische Wissenschaften Freie Universität Berlin,, Germany, [email protected] ^c Institut f Geologische Wissenschaften Freie Universität Berlin,, Germany, [email protected] ^d Institut f. Geowissenschaften CAU Kiel,, Germany, [email protected] ^e Institut f Geologische Wissenschaften Freie Universität Berlin,, Germany, [email protected] ^f Institut f Geologische Wissenschaften Freie Universität Berlin,, Germany, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2004, Issue ASEG2004 - 17th Geophysical Conference, Dec 2004, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2004ab050
- Published online: 01 Dec 2004

Abstract

The gravity field of the geologically contrasting Central and Southern Andes has been investigated with regard to iso static state, crustal density structure and rigidity of the lithosphere. The gravity database, together with other geophysical data, is a product of several years of field data acquisition in the Central and Southern Andes as part of the German Collaborative Research Centre SFB267 ("Deformation Processes in the Andes").

All gravity data are tied to the IGSN71 gravity datum and are terrain-corrected. The gravity effect of the subducting Nazca Plate was removed from both Bouguer and isostatic residual anomalies and then correlated with mean topographic heights to identify areas of disturbed isostatic equilibrium.

The abundance of geophysical information obtained by the SFB267 and its partners (e.g. geological, structural, seismic and magnetotelluric data) allows the development of well-constrained 3D forward gravity models. These models allow estimation of subsurface loading and, therefore, permit more rigorous estimation of lithospheric rigidity than if topographic loading alone were considered. To date we have used estimates of surface and subsurface loading from such 3D models with a 2D coherency method to estimate lithospheric rigidity in the central Andes.

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References

Ebbing, J., 2004, The Crustal Structures of the Alps from a combination of 3D gravity modelling and isostatic investigations: Tectonophysics, 380, 89-104.
Gotze, H.-J. and Kirchner, A., 1997, Gravity field at the South American active margin (20° to 29° S): Journal of South American Earth Sciences, 10(2), 179-188.
Gotze, H.-J. and Krause, S., 2002, The Central Andean Gravity High, a relic of an old subduction complex?: Journal of South American Earth Sciences, 14(8), 799-811.
Kosters, M., 1999, 3D density modelling of the Central Andean continental margin (20-26°S) and quantitative investigations of isostasy and rigidity: Ph.D. Thesis, Freie Universitat Berlin (in German).
Kosters, M., Gotze, H.-J., Schmidt, S., Fritsch, J. and Araneda, M., 1997, Gravity field of a continent-ocean transition mapped from land, air, and sea: EOS, 78(2), 13-16.
Oncken, O., Liischen, E., Mechie, J., Sobolev, S., Schulze, A., Gaedicke, C, Grunewald, S., Bribach, J., Asch, G., Giese, P., Wigger, P., Schmitz, M., Liith, S., Scheuber, E., Haberland, C, Rietbrock, A., Gotze, H.-J., Brasse, H., Patzwahl, R., Chong, G., Wilke, H.-G., Gonzalez, G., Jensen, A., Araneda, M., Vieytes, H., Behn, G., Martinez, E., Rossling, R., Amador, J., Ricaldi, E., Chumacero, H. and Luterstein, R., 1999, Seismic reflection image revealing offset of Andean subduction-zone earthquake locations into oceanic mantle: Nature, 397, 341-344.
Schmidt, S. and Gotze, H.-J., 1998, Interactive visualization and modification of 3D models using GIS functions: Physics and Chemistry of the Earth, 23(3), 289-296.
Schmidt, S., Gotze, H.-J., Siehl, A. and Tašárová, Z., this volume, 3D gravity and magnetic modelling and integration of constraints using open GIS: the IGMAS software package.

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Article Type: Research Article

Keyword(s): Bouguer gravity.; Central Andes; flexural rigidity; gravity field

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