Award Date

1-1-1988

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Geoscience

Number of Pages

161

Abstract

Changes in morphology and pedogenic carbonate accumulation establish relative ages of a chronosequence of calcic soils and pedogenic calcretes that underlie four surfaces identified on the Red Rock Canyon alluvial fan. All surfaces identified are formed of limestone alluvium, occur at elevations of 853 m, and share the same climate and vegetation. These surfaces were mapped and delimited by color, texture, dissection, and soil development and were ranked in relative age by elevation and topographic position; Because of difficulty in measuring pedogenic carbonate in soils derived from calcareous alluvium, a technique employing macroscopic and microscopic visual determinations, combined with Chittick analyses, was used to estimate volumetric pedogenic carbonate. From morphological correlation with {dollar}\sp{234}{dollar}U/{dollar}\sp{230}{dollar}Th dated calcic soils and pedogenic calcretes developed on nearby Kyle Canyon alluvial fan, rates of pedogenic carbonate accumulation in soils underlying Surfaces 2 and 3 range from 0.22 to 0.44 g/cm{dollar}\sp2{dollar}/ky.

Keywords

Alluvial; Canyon; Clark County; Development; Fan; Morphology; Nevada; Red Rock

Controlled Subject

Geology

File Format

pdf

File Size

7403.52 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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