In a recent post we discussed the Flinn-Diagram. There it was possible to see that – depending on the orientation of the regional stress field – a rock can be deformed in several ways, but the deformation of a rock unit is of course not visible in a small outcrop. Therefor, we have to lookContinue reading “The Flinn Diagram in Action”
Author Archives: crazygeology
The Flinn diagram
In the previous post we covered the basics of stress and strain, but these alone are nothing. We need some examples! So; what are these? Obviously, I could talk about folds and faults now, but that is boring. Instead, let me introduce you to the Flynn diagram. We can use this in combination with ourContinue reading “The Flinn diagram”
Stress and Strain
Pt. 1 The theoretical basis Probably one of the most important concepts in Structural Geology is the concept of stress and strain. I mean; somehow you have to explain all these wonderful structures that one can see in the field, right? The explanation is done with that concept, so: let’s get started, shall we? WhatContinue reading “Stress and Strain”
Determining the opening angle of folds
As you can probably imagine, not all folds were created equal, especially when it comes to their opening angle. There are wide folds, tight ones, etc. Anyhow; how do we determine the opening angle of a fold? Well, if you want to know that, then just continue reading. First and foremost, we are going toContinue reading “Determining the opening angle of folds”
Drawing basic fold elements in Schmidt’s net
By now you should be able to draw elements in Schmidt’s net and know the basic terminology of folds. So, let’s beat this bad boy and learn how to draw folds in Schmidt’s net, shall we? Imagine that you are mapping an area where you know a fold exists. So, you map that area andContinue reading “Drawing basic fold elements in Schmidt’s net”
Fold terminology
Before we can get started recreating folds in Schmidt’s net and interpreting them, we first have to know some basic terminology of them. I will try to keep this as short as possible, so…let’s start, shall we? First and foremost, what is a fold anyway? A fold is a geologic structure in which one orContinue reading “Fold terminology”
Schmidt’s net II
How to draw geometric elements in Schmidt’s net Welcome to part two of the basics. Here you will learn how to draw geometric elements (planes and vectors) into a Schmidt’s net in Clar’s notation (Dip direction/ Dip angle). Alright, then: let’s not waste any more time. You will need a copy of a Schmidt’s netContinue reading “Schmidt’s net II”
Schmidt’s net I
The bloody basics Intro to spatial geometry One of the main activities that geologists face is the creation of maps. In these maps you can find different geologic structures with specific spatial orientations. So, the question is now, how we measure these orientations. Since school you probably have been familiar with the concepts of theContinue reading “Schmidt’s net I”
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