SURFACE EXPOSURE DATING - REVIEW AND CRITICAL-EVALUATION

被引：21

作者：

DORN, RI

PHILLIPS, FM

机构：

[1] Department of Geography, Arizona State University, Tempe, AZ

[2] Department of Geoscience, New Mexico Tech, Socorro, NM

来源：

PHYSICAL GEOGRAPHY | 1991年 / 12卷 / 04期

基金：

美国国家科学基金会;

关键词：

Cosmogenic nuclides; Geochronology; Geomorphology; Process; Quaternary; Rock varnish; Soils; Surface exposure dating; Weathering;

D O I：

10.1080/02723646.1991.10642436

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The past decade has seen the development and application of over a dozen new methods for quantitative age-determinations of geomorphic surfaces. Some surface exposure dating methods are numerical, including the accumulation of cosmogenic radionuclides Be-10, C-14, Al-26, Cl-36, and Ca-41, accumulation of cosmogenic stable nuclides He-3 and Ne-21, C-14 dating of organic matter encapsulated in rock coatings, and dendrogeomorphology. Calendar ages are obtained by dendrogeomorphological analysis. Calibrated ages can be obtained by analysis of rock-varnish chemistry, lichenometry, weathering, and soils. Various methods can be used in combination to overcome individual limitations. Whereas conventional methods provide age control on stratigraphic profiles, surface-exposure dating methods are especially suitable for geographic problems, such as analyzing not only temporal, but also spatial variations in the rates of geomorphic processes.

引用

页码：303 / 333

页数：31

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