Paleopedology of soils in thick Holocene loess, Nebraska, USA
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| Format: | Artículo científico |
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Universidad Nacional Autónoma de México
2004
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| author | Peter M. Jacobs |
| author_facet | Peter M. Jacobs |
| contents | Paleopedology of soils in thick Holocene loess, Nebraska, USA Peter M. Jacobs Joseph A. Mason Ciencias de la Tierra Holocene Brady Soil Bignell Loess paleopedology Bignell Loess is a Holocene loess unit that has accumulated in the central Great Plains since9,000 14C yr BP. The Brady Soil separates Bignell Loess from last glacial Peoria Loess and thick sections,which can reach 6 m thickness, may contain four buried soils beneath the modern surface soil. TheBrady Soil has A/B/C horizonation, including a thick dark A and a blocky or prismatic structured Bhorizon. The Brady soil is intensely burrowed, probably by nymphs of cicada species, which requirewoody vegetation. Secondary carbonate is present in all genetic horizons and was emplaced post burial.The Holocene soils are dominated by A horizon characteristics, namely dark colors, but blocky or prismaticstructured B horizons occur in several sections. Secondary carbonate is present in most, but not allHolocene soils. Three phases of loess deposition and soil formation are evident from the thick proximalstratigraphic sections presented here. Initial rates of Bignell Loess deposition were low relative to therate of soil formation, producing a basal aggraded A horizon above the Brady Soil, that is capped by aincrement of loess with minimal pedogenic features. The middle portion of the Bignell Loess is finertextured and contains multiple dark buried soils. The final increment of loess is coarser and contains theweakly expressed modern surface soil. Climatically, termination of Brady Soil formation marks a shift todrier Holocene climates with a decrease in woody species, episodes of new loess deposition and soilformation, and secondary carbonate accumulation. 2004 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57221107 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.21 |
| format | Artículo científico |
| id | redalyc_57221107 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Paleopedology of soils in thick Holocene loess, Nebraska, USA Peter M. Jacobs Ciencias de la Tierra Holocene Brady Soil Bignell Loess paleopedology Paleopedology of soils in thick Holocene loess, Nebraska, USA Peter M. Jacobs Joseph A. Mason Ciencias de la Tierra Holocene Brady Soil Bignell Loess paleopedology Bignell Loess is a Holocene loess unit that has accumulated in the central Great Plains since9,000 14C yr BP. The Brady Soil separates Bignell Loess from last glacial Peoria Loess and thick sections,which can reach 6 m thickness, may contain four buried soils beneath the modern surface soil. TheBrady Soil has A/B/C horizonation, including a thick dark A and a blocky or prismatic structured Bhorizon. The Brady soil is intensely burrowed, probably by nymphs of cicada species, which requirewoody vegetation. Secondary carbonate is present in all genetic horizons and was emplaced post burial.The Holocene soils are dominated by A horizon characteristics, namely dark colors, but blocky or prismaticstructured B horizons occur in several sections. Secondary carbonate is present in most, but not allHolocene soils. Three phases of loess deposition and soil formation are evident from the thick proximalstratigraphic sections presented here. Initial rates of Bignell Loess deposition were low relative to therate of soil formation, producing a basal aggraded A horizon above the Brady Soil, that is capped by aincrement of loess with minimal pedogenic features. The middle portion of the Bignell Loess is finertextured and contains multiple dark buried soils. The final increment of loess is coarser and contains theweakly expressed modern surface soil. Climatically, termination of Brady Soil formation marks a shift todrier Holocene climates with a decrease in woody species, episodes of new loess deposition and soilformation, and secondary carbonate accumulation. 2004 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57221107 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.21 |
| title | Paleopedology of soils in thick Holocene loess, Nebraska, USA |
| topic | Ciencias de la Tierra Holocene Brady Soil Bignell Loess paleopedology |
| url | https://www.redalyc.org/articulo.oa?id=57221107 |