Geomorphology, characteristics and mineralogy of some soils in El-Farafra oasis, New Valley governorate, Egypt [electronic resource]
Language: English Summary language: Arabic Description: p. 275-292Other title:- الخصائص الجيومورفولوجية والأرضية والمعدنية لأراضي واحة الفرارفرة -محافظة الوادي الجديد- مصر [Added title page title]
- Menuofia journal of soil science, 2019 v. 4, (Dec) [electronic resource].
| Item type | Current library | Call number | Status | Date due | Barcode | |
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Main | ART MJSS V4 Dec 5 (Browse shelf(Opens below)) | Available |
Includes references.
The studied area belongs to El-Farafra Oasis, New Valley Governorate. It is
representing an area of about 372062 feddans. The aim of this work was to study the
geomorphology, characteristics and mineralogy of some soils in El-Farafra Oasis, New
Valley governorate, Egypt.
Visual interpretation of 2 sentinel images and digital elevation model (DEM) were used to
produce the geomorphic units and soil maps of the studied area. Two geomorphic units
were identified namely plateau and depression floor. Eighty-two miniplts and eighteen
soil profiles were chosen to represent the main soil mapping units in the studied area.
Soil samples were collected from the representative soil profiles for physical, chemical
and mineralogical analysis. The results could be summarized as follows:
X-ray diffraction analysis indicated that kaolinite is alternatively dominated in the studied
soils (about 80 %) followed by smectite. Illite, interstratified minerals and chlorite are
found as the lowest abundant clay minerals in these soils.
The mineralogical composition of the sand fraction indicated that, the light fraction• is
composed almost entirely of quartz which constitutes about 95%. Feldspar minerals
(orthoclase plagioclase and microcline) are detected in trace amounts. The presence of
feldspars indicates that, the soils are young from the pedological point of views.
Heavy minerals are generally dominated by opaque's (about 55 %). Non-opaques are
mainly dominated by pyroboles (pyroxenes + amphipoles) followed by ultra-stable
minerals (zircon, rutile and tourmaline), Para metamorphic minerals (garnet, kyanite,
staurolite, silimanite) and epidote. While the other minerals (biotite andalusite, glaucohite
and apatite) are detected in less pronounced amounts.
Distribution of the resistant minerals (biotite and amphipoles) weathering ratio, values
indicate that, the soils are generally heterogeneous either due to their multi-origin or due
to a subsequent variation along the course formation.
Summary in Arabic.
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