Journal ArticleDOI
Origin, Classification, and Geologic History of Caliche on the Southern High Plains, Texas and Eastern New Mexico
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TLDR
The caliche profiles on the southern High Plains, Texas and eastern New Mexico, are of Pliocene, Pleistocene, and Holocene age as mentioned in this paper and differ in age, physical factors and chemistry allow classification of the caliche into young, mature, and old types.Abstract:
The caliche profiles on the southern High Plains, Texas and eastern New Mexico, are of Pliocene, Pleistocene, and Holocene age. The Pliocene caliche is colloquially known as the "caprock." Differences in age, physical factors, and chemistry allow classification of the caliche into young, mature, and old types. Young caliche is incompetent and powdery except when formed as a laminated zone over an underlying plugged profile. Mature caliche is characteristically nodular, grading downward into old caliche which contains diagenetic quartz. Massive caliches form on semiarid, rapidly aggrading, flat surfaces of desert loess (regional eolian sand ergs), on thick calcareous sands providing local climate fluctuates between humid and semiarid, and on near-surface carbonate rocks. The base and sequential development of the caliche, regardless of parent material, are determined by extent and amount of infiltration of water during humid periods following accumulation of calcareous loess, permeability of the parent mat...read more
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Book ChapterDOI
Changes in Soil Carbon Storage and Associated Properties with Disturbance and Recovery
TL;DR: A review and analysis of what is known about the effects of agriculture on soil carbon storage can be found in this paper, where the authors review the present estimates of the size of the pool of carbon in world soils.
Journal ArticleDOI
Pedogenic carbonates: Forms and formation processes
TL;DR: In this paper, the authors summarized the available data and theories on forms and formation processes of pedogenic carbonates and relate them to environmental factors, and suggested the most important future research directions on PC, including the anthropogenic effects of fertilization and soil management.
Journal ArticleDOI
The formation of caliche in soils of the Mojave Desert, California
TL;DR: In this paper, the authors used radiocarbon and 230Th-234U dates of calcic horizons from calciorthid soil profiles in the Mojave Desert to calculate the rate of deposition of pedogenic CaCO3.
Journal ArticleDOI
Changing fluvial environments across the Permian-Triassic boundary in the Karoo Basin, South Africa and possible causes of tetrapod extinctions
TL;DR: This article used field observations of the sedimentary facies, palaeosols and in situ fossils of well exposed PTr boundary sequences in the southern Karoo Basin to provide evidence of environmental changes that may have caused the tetrapod extinctions in the main Karoo basin.
Book ChapterDOI
Calcium Carbonate Features
TL;DR: In this paper, the authors studied the morphological expression and hierarchical organization of calcitic pedofeatures in thin sections to partially decipher the climatic, geochemical, and biological influences on the precipitation of carbonates in soils.
References
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Journal ArticleDOI
Morphological and Genetic Sequences of Carbonate Accumulation in Desert Soils
Journal ArticleDOI
The k horizon: a master soil horizons of carbonate accumulations
TL;DR: In this article, the authors proposed the designation "K horizon" for soil horizons so strongly carbonate-impregnated that their morphology is determined by the carbonate, and the designation K2 is proposed for carbonate horizons of 90 percent or more, by volume, of K-fabric.
Journal ArticleDOI
The Origin of Caliche on the Northeastern Llano Estacado, Texas
TL;DR: Caliche underlies the soils of the northeastern Llano Estacado as single, double, or, in a few places, multiple layers, each consisting of relatively unindurated caliche grading upward into the indurated cap-rock as mentioned in this paper.
Journal ArticleDOI
Drainage Lines in Bas-Relief
TL;DR: In this article, a dendritic drainage pattern was found in bas-reliefs in Nejd, Eastern Saudi Aarbia, south of Darb Zubaida, 350-400 kilometers west of the Persian Gulf.