What is a petrographic thin section?
A thin section or petrographic thin section is a type of laboratory preparation commonly used in geology, minerology, or petrography. Typically, a thin section is used to analyze a sample of rock, mineral, pottery, soil, bone, or even a piece of metal.
How do you make a petrographic thin section?
This process is a simple one:
- Make sure the section is clean and free of grit or dirt.
- Place it on the hot plate.
- Mix up a small batch of epoxy and hardener.
- Place a small drop of epoxy on the section.
- Drop a cover slip on the drop.
- Move it around to expel bubbles and fully coat the section.
- Let it cure.
What is petrographic analysis?
Petrographic Analysis (ASTM C856) – A microstructural examination by optical and scanning electron microscopy (SEM) of the paste and aggregate on a prepared sample of concrete to look for features such as degree of cement hydration, microcracking, reaction products, breakdown of aggregate and evidence of poor freeze- …
What is the standard thickness of a thin section?
30 µm-thick
A Standard thin section is a 30 µm-thick slice of rock, concrete, etc., mounted with epoxy onto a 27 × 46 mm glass slide.
What is the difference between a thin section and a polished section?
thin sections are standard thin sections that are polished using progressively finer polishing compounds to create a highly reflective, scratch-free surface. Polished thin sections can be used on a slide without a coverslip, which allows direct access to the sample surface.
Does quartz have twinning in thin section?
Quartz. Keys to identification are:colorless nature, first order white-gray interference colors, and undulatory extinction. It also lacks cleavage, twinning and alteration. Color – colorless in thin section.
Why do we prepare thin section?
Thin sections are prepared in order to investigate the optical properties of the minerals in the rock. This work is a part of petrology and helps to reveal the origin and evolution of the parent rock. A photograph of a rock in thin section is often referred to as a photomicrograph.
Why do we do petrographic analysis?
A petrographic analysis is critical when trying to learn about a rock, reservoir, or formation of interest. The scale of investigation depends on the importance of the particular sample of interest. To fully describe and characterize a rock takes varying stages of analysis beginning with an outcrop or hand sample.
What is petrographic classification?
Someone who studies petrography is called a petrographer. The mineral content and the textural relationships within the rock are described in detail. The classification of rocks is based on the information acquired during the petrographic analysis.
How can you identify Muscovite in a thin section?
In general, keys to identifying muscovite are its low relief, lack of color, mica habit and cleavage, and second order interference colors. Color – usually colorless, less commonly pale green and slightly pleochroic. Habit and cleavage – often appears as tabs or long skinngy flakes which may be bent.
Why do we use thin sections?
Why do petrographic microscopes have polarizers?
A polarizer only allows certain light waves or vibrations to pass through it. An analyzer, often a second polarizer located above the sample, determines the amount and direction of light that illuminates a sample.
What is thin section petrographic analysis?
Petrographic analysis requires thin sections to be made. A thin section is a 30 µm thick slice of rock, minerals, concrete, or other material that is mounted to a glass microscope slide. Microanalysis Australia offers thin section services as a subset of our petrographic services.
Why choose thin section Australia?
Your time is precious, so Thin Section Australia combines the latest automated equipment, web-based pricing/ordering and reliable service to deliver high quality petrographic, geographic and mineral sample preparation every time. Quickly estimate the cost of a single slide or multiple batches in a single order.
Does micromicroanalysis Australia offer thin section services?
Microanalysis Australia offers thin section services as a subset of our petrographic services.
What is petrography?
Petrography is a branch of geology in where rocks and minerals are analysed using various types of microscopes. The data collected yields information regarding mineralogy, textures, associations, microstructures, and more.