Bernard's Geology Page

 

 

 

 

 
M.Sc. Thesis

Below you will find my M.Sc. thesis with as subject: Structural Geology and Tectonics of Precambrian Metamorphic rocks in the Sinai, Egypt. There are mistakes which I will correct in the near future. Figures, tables and appendices wil be added later.

Page 1

Introduction
General Geological Background
Introduction
Lithology
Metamorphism
Geochronology
The Shimron/Reymer Discussion

Page 2

The Structural Geology
Introduction
D1 structures
D2 structures

Page 3

The Shear Indicators
Introduction
Deformed Elliptical Objects
Introduction
Deformed Xenoliths
Introduction
Local Geology
Method for Strain Analysis of Elliptical Markers
The Parameters
The Results
Deformed Conglomerates
Deformed Boudins
Discussion
Conclusions
Rotated Clasts
Extensional Crenulation Cleavage
Asymmetric Folds

Page 4

Quartz c-axes
Introduction
Description of Samples
Results and Interpretation of Fabrics
Conclusions and Implications for Local Geology

Page 5

Deformation and Metamorphism
Conclusions on Structural Geology
Reversal in Sense of Shear
A Core Complex model for the Wadi Kid
Introduction
Deformation and Metamorphism in Core Complexes
Reversal in the Sense of Shear in Core Complexes
Core Complex Features in the Wadi Kid
A Model for the Tectonic History of the Wadi Kid
Conclusions
Acknowledgments

Page 6

References

 

Abstract
 

The Precambrian metamorphic rocks in the Wadi Kid area show two main phases of ductile deformation. The D1 compressional phase was related to subduction in an intra-arc setting. D2 phase was a phase of non-coaxial deformation along mylonitic shearzones. These mylonites form a sub horizontal penetrative foliation and were interpreted as low angle normal detachment faults. A variety of shear indicators indicate movement of the top block to NW. Due to doming of the granites reversal of shear took place in some parts of the area. Lithology, structures and metamorphism indicates that the Wadi Kid is a core complex of late Precambrian age. Orogenic collapse was responsible for the transition from the D1 compressional phase to the D2 extensional phase.