BibTeX
@ARTICLE{
Iaffaldano2007Mbg,
author = "G. Iaffaldano and H.-P. Bunge and H. M. B{\"u}cker",
title = "Mountain belt growth inferred from histories of past plate convergence: {A} new
tectonic inverse problem",
journal = "Earth and Planetary Science Letters",
volume = "260",
number = "3--4",
pages = "516--523",
doi = "10.1016/j.epsl.2007.06.006",
abstract = "Past plate motions display a range of variability, including speedups and slowdowns
that cannot easily be attributed to changes in mantle related driving forces. One key controlling
factor for these variations is the surface topography at convergent margins, as previous modeling
shows that the topographic load of large mountain belts consumes a significant amount of the driving
forces available for plate tectonics by increasing frictional forces between downgoing and
overriding plates. Here we use this insight to pose a new tectonic inverse problem and to infer the
growth of mountain belts from a record of past plate convergence. We introduce the automatic
differentiation method, which is a technique to produce derivative code free of truncation error by
source transformation of the forward model. We apply the method to a publicly available global
tectonic thin-shell model and generate a simple derivative code to relate Nazca/South America plate
convergence to gross topography of the Andes mountain belt. We test the code in a search algorithm
to infer an optimal paleotopography of the Andes 3.2 m.y. ago from the well-known history of
Nazca/South America plate convergence. Our modeling results are in excellent agreement with
published estimates of Andean paleotopography and support the notion of strong feedback between
mountain belt growth and plate convergence.",
year = "2007",
ad_area = "Geophysics",
ad_tools = "ADIFOR"
}
|