Climate in Earth History Studies in Geophysics (1982) / Chapter Skim
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11 Ancient Soils and Ancient Climates
11 Ancient Soils and Ancient Climates
Pages 112-117
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From page 112... ...
Such a study deals with those downward-mobilizing processes that oxidize plant debris, lower soil-water pH, dissolve minerals and remove soluble canons, produce new clay minerals (Singer, 1980) , and concentrate insoluble ferric and aluminum oxides in the upper horizon of the soil profile.
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From page 113... ...
The use of Recent laterite and calcrete as a model is limited, particularly because modern soils have developed during a time of considerable tectonic activity, a low stand of sea level, and assembled continental blocks (Figure 11.1)
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From page 114... ...
Similarly in Mesozoic and early Cenozoic bme laterites developed in high northern latitudes toward leeward coasts (Figure 11.2) when the open Atlantic Tethys and Caribbean permitted latitudinal oceanic circulation among continental fragments.
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From page 115... ...
During late Permian and Triassic time, longitudinal assemblage of Laurasia and Gondvwana prevented latitudinal oceanic circulation and led to a preponderance of calcrete over laterite in the intertropical zone of North America and Europe (Figures 11.1 and 11.3)
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From page 116... ...
During episodes of widespread regression, as in Early Cretaceous time, nonmarine sequences of stable landmasses commonly preserved a record of hot and humid climate in successive ferruginized profiles, as well as in deposits of transported laterites and of kaolinite associated with colitic ironstones. Laterite and colitic ironstones in the early Paleozoic and Proterozoic record demonstrate that development of these products of intense weathering were not uniquely dependent on the presence of vascular plants.
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From page 117... ...
. Kaolmitic clay rocks in the Triassic Banks wall sandztm~e of the we tern Blue Mountains, New South Waled, 1.
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