earth science

Pothole (geology)

Pothole (geology) 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 Pothole (geology) rather than just read about it. In short: A geological pothole is a natural depression in the rock filled with cooled magma, creating a fault. In horizontal section, potholes are roughly circular to elliptical and vary in diameter from 20 m to more than 1 km.

Key takeaways

Pothole (geology) 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 Pothole (geology) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Pothole (geology) from memory before moving on to harder problems.

Reference excerpt

A geological pothole is a natural depression in the rock filled with cooled magma, creating a fault. In horizontal section, potholes are roughly circular to elliptical and vary in diameter from 20 m to more than 1 km. In vertical section, their shape is generally dish-like and may be quite asymmetric.

Formation Potholes are frequently encountered during mining operations in the Bushveld Igneous Complex in South Africa. The massive intrusion of molten magma, predating the nearby Vredefort impact by at least 30 million years, led to partial to complete melting of the cumulus floor already in place. Flow and turbulence, high temperatures, and chemical reactions sculpted and potholed the surface of the floor in a process similar to the erosion caused by running water that results in a riverbed pothole. With the end of the outpouring, when emplacement ceased, cooling of the magma started, leaving the potholes filled, and creating a fault surface at the interface of the pothole and the filling magma. The final phase was when crystallisation of chromitite was followed by that of pyroxene and plagioclase, while the contents of the potholes, also consisting of UG2 or Merensky Reef, but having followed a different cooling profile, showed little or no crystallisation of chromitite.

Mining In the Bushveld Igneous Complex, two orebodies, the Upper Group 2 (UG2) and the Merensky Reef, host about 70% of the world's platinum group metals (PGM), and pose major extraction problems for the mining industry in their faults, dykes, joints, domes, iron-rich ultramafic pegmatoids, rolls and dunite pipes. The greatest mining problems, though, are presented by potholes. The problems posed by potholes to mining operations are rooted in the fracturing and fragmentation of the material in potholes and their surroundings. These lead to ground instabilities, especially in the hanging wall, and serious safety hazards. Mining is generally abandoned when more than about 40% of the raise line is potholed. A crew for developing new raise lines is usually on standby for such cases, incurring considerable development and labour costs.

References

Predictability of Pothole Characteristics and their Spatial Distribution at Rustenburg Platinum Mine - Chitiyo, Schweitzer, de Waal, Lambert and Ogilvie (Journal of the Southern African Institute of Mining and Metallurgy - December 2008)

Worked examples

Example 1 — a first encounter with Pothole (geology)

Start with the simplest possible case. Write down what Pothole (geology) 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 Pothole (geology) 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 Pothole (geology) 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 Pothole (geology)

In research: Pothole (geology) 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 Pothole (geology) 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: Pothole (geology) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geology of South Africa, Mining stubs, Mining terminology, so understanding it makes those chapters shorter.
In everyday life: Look for Pothole (geology) 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 Pothole (geology) in 20 minutes

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

Frequently asked questions

What is Pothole (geology) in simple terms?

Why does Pothole (geology) 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 Pothole (geology)?

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 Pothole (geology).