Publication Details

Field Value
Title: A method for evaluating basement exhumation histories from closure age distributions of detrital minerals
Authors: O. M. Lovera, M. Grove, D.L. Kimbrough, and P.L. Abbott
Publication: Jour. Geophys. Res., v. 104, p. 29419‐29438.
Publish Date: Dec 1999
DOI: 10.1029/1999JB900082
PDF: pdf
BibTEX Citation: Lovera:1999.bib


We have developed a two‐dimensional, thermo‐kinetic model that predicts the closure age distributions of detrital minerals from pervasively intruded and differentially exhumed basement. Using this model, we outline a method to determine the denudation history of orogenic regions on the basis of closure age distributions in synorogenic to postorogenic forearc strata. At relatively high mean denudation rates of 0.5 km m.y.−1 sustained over millions of years, magmatic heating events have minimal influence upon the age distributions of detrital minerals such as K‐feldspar that are moderately retentive of radiogenic Ar. At lower rates however, the effects of batholith emplacement may be substantial. We have applied the approach to detrital K‐feldspars from forearc strata derived from the deeply denuded Peninsular Ranges batholith (PRB). Agreement of the denudation history deduced from the detrital K‐feldspar data with thermochronologic constraints from exposed PRB basement lead us to conclude that exhumation histories of magmatic arcs should be decipherable solely from closure age distributions of detrital minerals whose depositional age is known