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Pedogenic carbonate proxies for amount and seasonality of precipitation in paleosols

Gregory J. Retallack
Pedogenic carbonate proxies for amount and seasonality of precipitation in paleosols
Geology (Boulder) (April 2005) 33 (4): 333-336

Abstract

The depth to carbonate nodular (Bk) horizon in soils (D in cm) is correlated with mean annual precipitation (P in mm), so that Bk horizons are deep in subhumid regions, but shallow in semiarid regions. Previous quantifications of this relationship are unchanged by this new compilation of 807 soils: P = 137.24+6.45D+0.013D (super 2) , where R (super 2) = 0.52, and standard error (S.E.) = + or -147 mm. In most North American postglacial soils, the Bk horizon is thin and well defined, whereas in monsoonal tropical soils of Pakistan and Kenya, the Bk horizon is thick and diffuse. Data from 675 modern soils define the relationship between the thickness of soil with nodules (T in cm) and mean annual range of precipitation (M in mm difference between monthly means of wettest and driest months): M = 0.79T+13.71, where R (super 2) = 0.58, and S.E. = + or -22 mm). The relationship between carbonate nodule size (S in cm) and soil age (A in ka) is quantified by 9 radiocarbon-dated soils from Las Cruces, New Mexico: A = 3.92S (super 0.34) , where R (super 2) = 0.57, and S.E. = 1.8 k.y. These transfer functions are applied to reconstructing paleoclimatic change from Paleocene-Eocene paleosols of the North Horn Formation and Flagstaff Limestone of Axhandle Canyon, Utah. The terminal Paleocene spike of warmth recorded by fossil plants in nearby Wyoming was coincident with a brief peak in both mean annual precipitation and mean annual range of precipitation in Utah.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 33
Serial Issue: 4
Title: Pedogenic carbonate proxies for amount and seasonality of precipitation in paleosols
Affiliation: University of Oregon, Department of Geological Sciences, Eugene, OR, United States
Pages: 333-336
Published: 200504
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 46
Accession Number: 2005-031095
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2005054
Illustration Description: illus. incl. sects.
N39°24'12" - N39°24'12", W111°40'55" - W111°40'55"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200517
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