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Pressure solution

Pressure solution is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Pressure solution rather than just read about it. In short: In structural geology and diagenesis, pressure solution or pressure dissolution is a deformation mechanism that involves the dissolution of minerals at grain-to-grain contacts into an aqueous pore fluid in areas of relatively high stress and either deposition in regions of relatively low stress within the same rock or their complete removal from the rock within the fluid. It is an example of diffusive mass transfer.

Pressure solution — main illustration
Pressure solution — illustration

Key takeaways

  • Pressure solution belongs to earth science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Pressure solution to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Pressure solution from memory before moving on to harder problems.

Reference excerpt

In structural geology and diagenesis, pressure solution or pressure dissolution is a deformation mechanism that involves the dissolution of minerals at grain-to-grain contacts into an aqueous pore fluid in areas of relatively high stress and either deposition in regions of relatively low stress within the same rock or their complete removal from the rock within the fluid. It is an example of diffusive mass transfer. The detailed kinetics of the process was reviewed by Rutter (1976), and since then such kinetics has been used in many applications in earth sciences.

Occurrence Evidence for pressure solution has been described from sedimentary rocks that have only been affected by compaction. The most common example of this is bedding plane parallel stylolites developed in carbonates. In a tectonic manner, deformed rocks also show evidence of pressure solution including stylolites at a high angle to bedding. The process is also thought to be an important part of the development of cleavage.

Theoretical models A theoretical model was formulated by Rutter, and a recent mathematical analysis was carried out, leading to the so-called Fowler–Yang equations, which can explain the transition behaviour of pressure solution.

See also Fick's laws of diffusion Fold (geology) Rock microstructure Stylolite Terzaghi's principle

References

Illustrations

Pressure solution: Schematic diagram of pressure solution accommodating compression/compaction in a clastic rock. Left box shows the situation before compaction. Red arrows indicate areas of maximum stress (= grain contacts). Blue arrows indicate the flow of dissolved species (e.g., Ca2+ and HCO–3 in case of limestone) in aqueous solution. Right box shows the situation after compaction. In light coloured areas new mineral growth has reduced pore space.
Schematic diagram of pressure solution accommodating compression/compaction in a clastic rock. Left box shows the situation before compaction. Red arrows indicate areas of maximum stress (= grain contacts). Blue arrows indicate the flow of dissolved species (e.g., Ca2+ and HCO–3 in case of limestone) in aqueous solution. Right box shows the situation after compaction. In light coloured areas new mineral growth has reduced pore space.
Pressure solution: Deformed coral limestone showing flattening accommodated both by plastic deformation of the corals and pressure solution along stylolites.
Deformed coral limestone showing flattening accommodated both by plastic deformation of the corals and pressure solution along stylolites.

Worked examples

Example 1 — a first encounter with Pressure solution

Start with the simplest possible case. Write down what Pressure solution claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Pressure solution before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Pressure solution ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Pressure solution

In research
Pressure solution appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Pressure solution in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Pressure solution is common in secondary-school and first-year university syllabi. It links to neighbouring topics Limestone, Petrology, Sedimentary rocks, so understanding it makes those chapters shorter.
In everyday life
Look for Pressure solution outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Pressure solution in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Pressure solution means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Pressure solution out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pressure solution in simple terms?

In structural geology and diagenesis, pressure solution or pressure dissolution is a deformation mechanism that involves the dissolution of minerals at grain-to-grain contacts into an aqueous pore fluid in areas of relatively high stress and either deposition in regions of relatively low stress wit…

Why does Pressure solution matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Pressure solution?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Pressure solution.

Tags

  • Limestone
  • Petrology
  • Sedimentary rocks
  • Structural geology
  • Structural geology stubs

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