Skip to Main Content
Book Chapter

On the isostatic state of the eastern Alps and the central Andes; A statistical comparison

By
Hans-Jürgen Götze
Hans-Jürgen Götze
Search for other works by this author on:
Bruno Meurers
Bruno Meurers
Search for other works by this author on:
Sabine Schmidt
Sabine Schmidt
Search for other works by this author on:
Peter Steinhauser
Peter Steinhauser
Search for other works by this author on:
Published:
January 01, 1991

The gravity field of the eastern Alps and the central Andes was investigated with regard to the isostatic state and the tectonic evolution of these young orogens. Bouguer and isostatic anomalies were correlated with mean topographic heights. Statistical analysis and theoretical modeling were applied in order to determine the degree to which quantitative conclusions could be drawn. Additionally the balance of topographic surplus and deficit masses was estimated for both areas under investigation.

A significant correlation between Bouguer anomalies and mean topographic heights is observed, which qualitatively indicates more or less isostatic equilibrium, while the mean isostatic anomalies are slightly positive and larger in the Andes than in the Alps. This agrees well with results from mass budget estimations, which show gravimetric mass deficits being 10 percent smaller than the topographic load for both mountain ranges. Therefore, an undercompensation effect of the Alpine and Andean crust can be concluded. On a regional scale this is in contrast to the observed positive vertical movements, because subsidence should be expected.

Therefore, the isostatic states and the vertical movement patterns can be considered to be effects of plate tectonic forces due, respectively, to the collision of the Eurasian and African plates (eastern Alps) and the subduction of the Nazca plate under the South American continent (central Andes).

You do not currently have access to this article.

Figures & Tables

Contents

GSA Special Papers

Andean Magmatism and Its Tectonic Setting

Russell S. Harmon
Russell S. Harmon
Search for other works by this author on:
Carlos W. Rapela
Carlos W. Rapela
Search for other works by this author on:
Geological Society of America
Volume
265
ISBN print:
9780813722658
Publication date:
January 01, 1991

References

Related

Citing Books via

Related Articles
Related Book Content
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal