Questions related to Regional Geology
The presence of two normal faults at one dam foundation is inferred from regional geology. Locally, the foundation rocks around and between the fault suspected zones are covered by thick deposits of gravely Sand with boulders and sandy Silt soils. Unfortunately, exploratory core holes drilled did not cross the fault planes but entails some of their effects.
Now, it is required to determine the exact position (orientation and width) of the fault zones to design appropriate foundation treatment measures before starting construction. Which geophysical technique do you think is best to apply to this problem? All propositions/answers are valuable. Thank you.
In some stratigraphic section, quartzites represents the UNCONFORMITY LEVEL or basement.
Could anyone recommend me some "reference studies/review papers" that explain "why quartzites represent the unconformities"?
The paleostress orientations inferred from the orientations of dikes (see attached figure) indicate that none of the principal stress axes is oriented at neither vertical nor horizontal orientation, rather all of them are oriented at the intermediate orientation between the vertical and horizontal orientations. Hence, the fact violates the Anderson theory of faulting, where one of the principal stress axes must be vertical due to the stress boundary condition at the surface of the earth.
What could be the plausible explanation?
According to my knowledge Landslides start from a tension crack and propagate along a critical slip surface. There are circular, non-circular etc.. various kinds of slip surfaces, i would like to know how we can guess the type of slip surface based on regional geology and geotechnical properties. Can someone point me to specific publications that are well known in this regard?
I am currently doing a research on the boundary between Zimbabwe craton and Limpopo belt mainly focusing on the Northern marginal zone. Does anyone have suggestion of articles or rather have a different perspective on the events that took place, I mean the different subdivisions of the Limpopo belt consist of different ages. For example the the Central zone shows ages of around 2 Ga whilst the southern marginal zone shows both 2Ga and dominantly 2.7Ga not quiet sure about the Northern marginal zone. What does this mean, Or maybe the Zimbabwe craton collided with something first before ?
Do you recognize the chert structure in attached pdf from the early Eocene Rus Fm of Qatar, Middle East? Is it stromatolitic?
Part of my research is based on African Geology and so i would like to know if there's any information i can get on crustal formation and craton amalgamation in relation to Africa
I am working on a research paper on plutons, specifically the Sierra Nevada batholith region for geology and need good foundation articles.