عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
NATIONAL BIBLIOGRAPHY NUMBER
Number
TLpq303968567
LANGUAGE OF THE ITEM
.Language of Text, Soundtrack etc
انگلیسی
TITLE AND STATEMENT OF RESPONSIBILITY
Title Proper
Structure, metamorphism and tectonic setting of a gneissic terrane, the Sagan Afelata area, southern Ethiopia
General Material Designation
[Thesis]
First Statement of Responsibility
S. Gichile
Subsequent Statement of Responsibility
W. K. Fyson
.PUBLICATION, DISTRIBUTION, ETC
Name of Publisher, Distributor, etc.
University of Ottawa (Canada)
Date of Publication, Distribution, etc.
1991
PHYSICAL DESCRIPTION
Specific Material Designation and Extent of Item
265
DISSERTATION (THESIS) NOTE
Dissertation or thesis details and type of degree
M.Sc.
Body granting the degree
University of Ottawa (Canada)
Text preceding or following the note
1991
SUMMARY OR ABSTRACT
Text of Note
The Sagan-Afelata area, which extends east approximately 100 km from the Main Ethiopian Rift towards the Adola gold fields, is underlain by high-grade rocks, dominantly biotite and quartzofeldspathic gneiss. The gneissic rocks are characteristically of K-rich mineralogy and appear to form a Proterozoic supracrustal sequence rather than Archean basement as thought earlier. The gneissic rocks were subjected to at least three distinct phases of deformation. The first, D, to which probably several generations of structures are attributed, formed migmatitic layering then isoclinal folds that transposed the layers parallel to flat-lying regional foliation (S), during amphibolite to granulite facies metamorphism. The second, D2, formed upright folds in S and parallel layers with subhorizontal NNW to NNE trending axes, accompanied by amphibolite facies metamorphism that overprinted most rocks. D3, resulted in local E-W trending, open, upright folds that are confined to the eastern part of the area. (Abstract shortened by UMI.)
TOPICAL NAME USED AS SUBJECT
Earth sciences
Geology
PERSONAL NAME - PRIMARY RESPONSIBILITY
S. Gichile
W. K. Fyson
ELECTRONIC LOCATION AND ACCESS
Electronic name
مطالعه متن کتاب p
[Thesis]
276903
a
Y
