Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.2172/130649 |
| 报告编号 | INEL--95/0505 |
| 来源ID | OSTI_ID: 130649 |
| Characteristics and origin of Earth-mounds on the Eastern Snake River Plain, Idaho | |
| Tullis, J.A. | |
| 英文摘要 | Earth-mounds are common features on the Eastern Snake River Plain, Idaho. The mounds are typically round or oval in plan view, <0.5 m in height, and from 8 to 14 m in diameter. They are found on flat and sloped surfaces, and appear less frequently in lowland areas. The mounds have formed on deposits of multiple sedimentary environments. Those studied included alluvial gravel terraces along the Big Lost River (late Pleistocene/early Holocene age), alluvial fan segments on the flanks of the Lost River Range (Bull Lake and Pinedale age equivalents), and loess/slopewash sediments overlying basalt flows. Backhoe trenches were dug to allow characterization of stratigraphy and soil development. Each mound has features unique to the depositional and pedogenic history of the site; however, there are common elements to all mounds that are linked to the history of mound formation. Each mound has a {open_quotes}floor{close_quotes} of a sediment or basement rock of significantly different hydraulic conductivity than the overlying sediment. These paleosurfaces are overlain by finer-grained sediments, typically loess or flood-overbank deposits. Mounds formed in environments where a sufficient thickness of fine-grained sediment held pore water in a system open to the migration to a freezing front. Heaving of the sediment occurred by the growth of ice lenses. Mound formation occurred at the end of the Late Pleistocene or early in the Holocene, and was followed by pedogenesis. Soils in the mounds were subsequently altered by bioturbation, buried by eolian deposition, and eroded by slopewash runoff. These secondary processes played a significant role in maintaining or increasing the mound/intermound relief. |
| 出版年 | 1995 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 58 GEOSCIENCES ; SNAKE RIVER PLAIN ; STRATIGRAPHY ; ALLUVIAL DEPOSITS ; GEOMORPHOLOGY ; SEDIMENTATION ; IDAHO ; SOILS ; GEOLOGIC MODELS |
| URL | http://www.osti.gov/scitech/servlets/purl/130649 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/266323 |
| 推荐引用方式 GB/T 7714 | Tullis, J.A.. Characteristics and origin of Earth-mounds on the Eastern Snake River Plain, Idaho,1995. |
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