The Subgrain Size Piezometric is done by a Triassic halite from the upper bunter formation in Hengelo, Netherlands. The rock salt halite is white and normally in thin sections are no crystal boundaries observable, because of the cubic crystal structure and its optical isotropy. To make even the sub grain boundaries visible, the sample has to prepared in a special way, where the crystals appear blue and the boundaries white.
For the Subgrain Size Piezometric we uploaded first a picture 430.9-1, which we took as an example, in the program “ImageJ” and changed the type to 8-bit. The next step is adjusting the threshold. The program allows an automatically threshold, but for a better analysis it does be done manually. Figure 1 shows the converted image. Other programs for example MATLAB or ArcGIS can be used as well. [...]
Inhaltsverzeichnis (Table of Contents)
- Subgrain Size Piezometric on a Halite
- Description of the used method
- Calculation Results of all Pictures
- Error calculation
- Palaeo-stress
- References
- Microstructural Analysis
- Description of the used method
Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)
This text explores the application of subgrain size piezometry to a Triassic halite sample from Hengelo, Netherlands. The analysis aims to determine palaeo-stress conditions based on the size and distribution of subgrains within the halite crystal structure.
- Subgrain Size Piezometry
- Microstructural Analysis of Halite
- Palaeo-stress Determination
- Error Calculation and Mitigation
- Image Processing and Analysis Techniques
Zusammenfassung der Kapitel (Chapter Summaries)
The first chapter provides a detailed description of the subgrain size piezometric method used to analyze the halite sample. This includes the preparation of the sample, image capture, and image processing techniques. The chapter discusses the importance of manually adjusting the threshold in image processing to accurately identify subgrain boundaries.
The subsequent chapters delve into the results of the analysis, including the calculation of subgrain size and its relationship to palaeo-stress conditions. Error calculation methods are discussed, along with potential sources of error such as gas bubbles and cracks within the sample.
Schlüsselwörter (Keywords)
The key focus of this text is on the analysis of subgrain size in halite as a proxy for palaeo-stress determination. The text explores image processing techniques for identifying subgrain boundaries, error calculation, and the interpretation of results within a geological context.
Frequently Asked Questions
What is subgrain size piezometry?
Subgrain size piezometry is a geological method used to determine palaeo-stress conditions by measuring the size and distribution of subgrains within a mineral, such as halite.
How is the halite sample prepared for analysis?
The sample is prepared in a special way so that crystals appear blue and the subgrain boundaries appear white, making them visible for microscopic analysis.
Which software is used for image processing?
The program "ImageJ" is primarily used, but other programs like MATLAB or ArcGIS can also be utilized for converting images and adjusting thresholds.
What are common sources of error in this method?
Potential errors can be caused by the presence of gas bubbles, cracks within the salt sample, or inaccurate manual threshold adjustments during image processing.
Where did the halite sample used in this study come from?
The sample is a Triassic halite from the upper bunter formation located in Hengelo, Netherlands.
- Citar trabajo
- Amalia Aventurin (Autor), 2013, Subgrain Size Piezometric on a Halite, Múnich, GRIN Verlag, https://www.grin.com/document/272601
