Knowledge Resource Center for Ecological Environment in Arid Area
| 报告编号 | PB2007107007 |
| Geology, Water, and Wind in the Lower Helmand Basin, Southern Afghanistan. | |
| Whitney, J. W. | |
| 英文摘要 | This report presents an overview of the geology, hydrology, and climate of the lower Helmand Basin, a large, closed, arid basin in southern Afghanistan. The basin is drained by the Helmand River, the only perennial desert stream between the Indus and Tigris-Euphrates Rivers. The Helmand River is the lifeblood of southern Afghanistan and has supported desert civilizations in the Sistan depression for over 6,000 years.The Helmand Basin is a structurally closed basin that began to form during the middle Tertiary as a consequence of the collision of several Gondwanaland fragments. Aeromagnetic studies indicate the basin is 35 kilometers deep over basement rocks. Continued subsidence along basin-bounding faults in Iran and Pakistan throughout the Neogene has formed the Sistan depression in the southwest corner of the basin. Lacustrine, eolian, and fluvial deposits are commonly exposed in the basin and were intruded by latest Miocenemiddle Quaternary volcanoes, which indicates that depositional environments in the lower Helmand Basin have not substantially changed for nearly 10 million years. |
| 英文关键词 | Geology Water Wind Afghanistan Physiography Tectonic origins History Desert environment Climate Eolian environment Water quality Channel changes Hydrology Lower Helmand Basin Sistan Depression |
| 出版年 | 2006 |
| 语种 | 英语 |
| 国家 | United States |
| URL | http://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=59fb2cd431c97d1d54a0026a |
| 来源机构 | United States Geological Survey |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/273440 |
| 推荐引用方式 GB/T 7714 | Whitney, J. W.. Geology, Water, and Wind in the Lower Helmand Basin, Southern Afghanistan.,2006. |
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