Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/S0195-6671(03)00033-8 |
Palaeofluvial estimates from exhumed meander scrolls, Taref Formation (Turonian), Dakhla Region, Western Desert, Egypt | |
Brookes, IA | |
通讯作者 | Brookes, IA |
来源期刊 | CRETACEOUS RESEARCH |
ISSN | 0195-6671 |
出版年 | 2003 |
卷号 | 24期号:2页码:97-104 |
英文摘要 | An array of meander scroll sets (point bar complexes) is exposed over a land surface eroded across the dip slope of sandstones of the Nubia Group, Taref Formation (Turonian) around the southern fringe of Dakhla Oasis, Egypt (25.5degreesN, 29degreesE). These sandstones are thus interpreted as fluvially deposited. Using published equations, bankfull channel width, depth, as well as sinuosity are estimated from radii of meander curvature. With a reasonable assumption of velocity, bankfull discharge is then estimated. This is found to be comparable with bankfull discharge values estimated from published plots of hydraulic geometry (width and depth) against discharge. Both approaches result in mean bankfull discharge estimates of 4.4-7.0 x 10(3) m(3)s(-1). Using mean radius of meander curvature, sinuosity is estimated at 1.66, In this hyperarid climatic region aeolian erosion has carved yardangs into the Taref sandstone, the flanks of which expose uniform, tabular cross-beds of coarse, clean quartz sand. From the palaeofluvial estimates, from other features of the exhumed meander scrolls, and from the character of the sandstone, channels in which the Taref sands were deposited are inferred to have been wide and shallow, of low sinuosity, rapidly migrating laterally, with minimal overbank deposition of muds, and rapid vertical accretion. Published indications of a tropical monsoon climate over Egypt in the Turonian are harmonized with the absence of fossil flora from the Taref with reference to indications of a rapidly changing fluvial landscape. (C) 2003 Published by Elsevier Ltd. |
英文关键词 | cretaceous Turonian Nubia Group Taref Formation Dakhla Oasis Egypt fluvial sandstone |
类型 | Article |
语种 | 英语 |
国家 | Canada |
收录类别 | SCI-E |
WOS记录号 | WOS:000184609000001 |
WOS类目 | Geology ; Paleontology |
WOS研究方向 | Geology ; Paleontology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/144382 |
作者单位 | (1)York Univ, Dept Geog, Toronto, ON M3J 1P3, Canada |
推荐引用方式 GB/T 7714 | Brookes, IA. Palaeofluvial estimates from exhumed meander scrolls, Taref Formation (Turonian), Dakhla Region, Western Desert, Egypt[J],2003,24(2):97-104. |
APA | Brookes, IA.(2003).Palaeofluvial estimates from exhumed meander scrolls, Taref Formation (Turonian), Dakhla Region, Western Desert, Egypt.CRETACEOUS RESEARCH,24(2),97-104. |
MLA | Brookes, IA."Palaeofluvial estimates from exhumed meander scrolls, Taref Formation (Turonian), Dakhla Region, Western Desert, Egypt".CRETACEOUS RESEARCH 24.2(2003):97-104. |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Brookes, IA]的文章 |
百度学术 |
百度学术中相似的文章 |
[Brookes, IA]的文章 |
必应学术 |
必应学术中相似的文章 |
[Brookes, IA]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。