Distinguishing between tectonic and lithologic controls on bedrock channel longitudinal profleiles using cosmogenic 10Be erosion rates and channel steepness index

被引：70

作者：

Cyr, Andrew J. ^{[1
]}

Granger, Darryl E. ^{[1
]}

Olivetti, Valerio ^{[2
]}

Molin, Paola ^{[2
]}

机构：

[1] Purdue Univ, Dept Earth & Atmospher Sci, W Lafayette, IN 47907 USA

[2] Univ Roma Tre, Dipartimento Sci Geol, I-00146 Rome, Italy

来源：

GEOMORPHOLOGY | 2014年 / 209卷

基金：

美国国家科学基金会;

关键词：

Erosion; Channel longitudinal profiles; Cosmogenic nuclides; Channel steepness; Italy; CALABRIA-PELORITANI OROGEN; TRIPLE JUNCTION REGION; ROCK-UPLIFT RATES; HILLSLOPE EVOLUTION; RIVER INCISION; OROGRAPHIC PRECIPITATION; SLAB DETACHMENT; STREAM POWER; FORE-ARC; NORTHERN;

D O I：

10.1016/j.geomorph.2013.12.010

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

Knickpoints in fluvial channel longitudinal profiles and channel steepness index values derived from digital elevation data can be used to detect tectonic structures and infer spatial patterns of uplift. However, changes in lithologic resistance to channel incision can also influence the morphology of longitudinal profiles. We compare the spatial patterns of both channel steepness index and cosmogenic Be-10-determined erosion rates from four landscapes in Italy, where the geology and tectonics are well constrained, to four theoretical predictions of channel morphologies, which can be interpreted as the result of primarily tectonic or lithologic controls. These data indicate that longitudinal profile forms controlled by unsteady or nonuniform tectonics can be distinguished from those controlled by nonuniform lithologic resistance. In each landscape the distribution of channel steepness index and erosion rates is consistent with model predictions and demonstrates that cosmogenic nuclide methods can be applied to distinguish between these two controlling factors. Published by Elsevier B.V.

引用

页码：27 / 38

页数：12