Arid
DOI10.1016/S1002-0721(09)60136-8
Laterites-bearing REEs, Wadi Natash, Southeastern Desert, Egypt
Ibrahim, Mohamed El-Ahmady
通讯作者Ibrahim, Mohamed El-Ahmady
来源期刊JOURNAL OF RARE EARTHS
ISSN1002-0721
出版年2010
卷号28期号:3页码:471-476
英文摘要

The present paper recorded the occurrence of laterites-bearing REEs in Natash area. Natash laterite deposits occur as horizons (5-15 m in thickness) at the boundary between the Cretaceous sandstones, and Natash flows. Laterite was recorded in more than twenty six occurrence distributed over an area of about 500 km(2) along and around Wadi Natash. It ranges in color from light-grey, dark-grey to reddish-brown. The distribution of laterite deposits is structural controlled. Mineralogical results of laterites proved the presence of both kaolinite and montmorillonite as clay minerals. The presence of hyperthene, diopside and tremolite indicated that their main source was basic Natash flows. The presence of gypsum, hematite, goethite, calcite and kaolinite indicated that, the Natash laterites were related to tropical weathering. conditions. The presence of ilmenorutile and rutile in the laterites declared the reducing and low pH. All the Natash laterite samples were characterized by very highly irregular REE pattern with HREE enrichment. Generally, the Sigma REEs+Y, ranged from 0.36%-0.71% with an average of about 0.59%. The LREE was less concentrated than the HREE by a factor of 0.57.Sigma(LREE/HREE=0.57) which suggested that, the HREE contents in laterites were derived from the basic and intermediate flows rather than from acidic lavas flows.


英文关键词Natash flows laterites clay minerals REEs
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000279401000032
WOS关键词BAUXITE DEPOSITS
WOS类目Chemistry, Applied
WOS研究方向Chemistry
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/165438
作者单位(1)Nucl Mat Author, Cairo, Egypt
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Ibrahim, Mohamed El-Ahmady. Laterites-bearing REEs, Wadi Natash, Southeastern Desert, Egypt[J],2010,28(3):471-476.
APA Ibrahim, Mohamed El-Ahmady.(2010).Laterites-bearing REEs, Wadi Natash, Southeastern Desert, Egypt.JOURNAL OF RARE EARTHS,28(3),471-476.
MLA Ibrahim, Mohamed El-Ahmady."Laterites-bearing REEs, Wadi Natash, Southeastern Desert, Egypt".JOURNAL OF RARE EARTHS 28.3(2010):471-476.
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