Age-dating implications from the morphologic, petrologic, and isotopic investigations of a calcic soil, Terrell County, Texas /
"marginal" conditions for calcic soil development.
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1994.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | "marginal" conditions for calcic soil development. ]) indicate the Km and K horizon carbonates are the result of 180 ︢20 Kyr. A fine grained calcic soil has developed upon Pliocene- accumulation will allow the use of a calcic soil an area classified by the Soil Conservation Service as having analyses on portions of the Km horizon show that CACO, is the area. The soil has a 109 cm thick Stage IV K horizon at as reflecting carbonate precipitation in a C4 vegetative composition, the 8"C results (-3.4 to 1.4%o) are interpreted Cretaceous (Segovia) limestone. 8"O differences between the K depths of 68-80 cm. In gravelly areas of the soil a 15-20 cm developmental index to obtain age-dates in this "marginal" distinct isotopic signature and correlate with depth. Bulk dominant material present and displaced the clays forming dominated by CaCO3 (98% by weight) with minor amounts of environment. This C4 environment remained dominant Establishing pedogenesis as the mechanism of carbonate horizon were analyzed, The comparison of individual laminae horizons (-3.0 to -1.7%o) and local limestone (-6.1 to -4.9[ in the soil resulting in an average soil development age of inheritance from limestone as factors influencing isotopic interface. After ruling out atmospheric mixing and isotopic isotopic analyses were run on the K horizon and local Km horizon show a 8"O shift of 2-49voo across the soil-rock laminar and pisolith features. The carbonate chemistry is MgCO3 (0.7% by weight). Two stable C and 0 isotope transacts Miocene alluvial gravels derived from Cretaceous limestone of novaculite from the Marathon uplift. This soil is located in pedogenesis is responsible for the carbonate in the soil. sampled at I and 2.5 mm intervals across the laminated Km soil processes. Transects across limestone clasts within the the Stockton Plateau and Paleozoic limestone, chert, and thick laminar Km horizon caps the K horizon. Microprobe throughout Km horizon deposition. These results imply Thus, a calcic soil development index can be response applied to obtain an age-date. The index analysis of the K horizon within two transacts shows that individual laminae have a yields an average amount of secondary carbonate of 92 g/CM2 |
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| Item Description: | "Major subject: Geology". Vita. |
| Physical Description: | xiii, 85 leaves : illustrations, maps ; 28 cm. Also available online. |
| Bibliography: | Includes bibliographical references. |