Typic Haplustox (fine, kaolinitic, isohyperthermic) : 無料・フリー素材/写真
Typic Haplustox (fine, kaolinitic, isohyperthermic) / SoilScience.info
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | This road cut was photographed in the Federal District of Brazil. The apparent blocky structure is the result of compaction by heavy equipment and the real structure is strong fine granular. The gravelly layer between 125 and 175 cm illustrates the fluvial origin of the parent material for most Oxisols. Over millennia relatively tectonically stable areas of tropical continents have been subjected to cycles of erosion and deposition. Silicate minerals have been dissolved, kaolinite and gibbsite minerals have formed and iron oxides have been preserved and/or reformed due oxidizing conditions in the sediments. Most gravel is iron cemented and thick layers are not commonly seen in Oxisols but less distinct evidence of fluvial deposition is often present. The often cited ‘highly weathered’ condition of Oxisols can best be attributed to weathering of primary minerals under oxidizing conditions as the material endured many cycles of erosion and deposition not related to climatic conditions at the present location. Be aware that Oxisols are present in all soil moisture regimes from aridic to perudic. |
| 撮影日 | 2010-06-24 16:11:41 |
| 撮影者 | SoilScience.info , Raleigh |
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