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Stock (geology)

Stock (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 Stock (geology) rather than just read about it. In short: In geology, a stock is an igneous intrusion that has a surface exposure of less than 100 square kilometres (40 sq mi), differing from batholiths only in being smaller. A stock has a discordant relationship with the rocks that it intrudes.

Stock (geology) — main illustration
Stock (geology) — illustration

Key takeaways

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

Reference excerpt

In geology, a stock is an igneous intrusion that has a surface exposure of less than 100 square kilometres (40 sq mi), differing from batholiths only in being smaller. A stock has a discordant relationship with the rocks that it intrudes. Many stocks are cupolas of hidden batholiths. Some circular or elliptical stocks may be volcanic plugs, which fill the vents of now extinct volcanoes. A boss is a small stock.

Examples the Alta and Clayton Peak stocks (composed of granodiorite), near Park City, Utah the Hellroaring Creek and Salal Creek stocks (of granite-granodiorite and quartz monzonite, respectively) in British Columbia, Canada the Céret stock (of gabbro and diorite) in Pyrénées-Orientales, France the Parashi stock (of tonalite) in La Guajira Department, Colombia stocks of syenite in the Caldera de Tejeda on Gran Canaria Ailsa Craig granitic boss, which forms a volcanic plug, in Scotland

References

Illustrations

Stock (geology): A stock of nordmarkite (quartz-alkali syenite) of Triassic age, in the Gevanim Valley, Makhtesh Ramon, southern Israel.
A stock of nordmarkite (quartz-alkali syenite) of Triassic age, in the Gevanim Valley, Makhtesh Ramon, southern Israel.

Worked examples

Example 1 — a first encounter with Stock (geology)

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

In research
Stock (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 Stock (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
Stock (geology) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Igneous intrusions, Igneous petrology stubs, Stocks (geology), so understanding it makes those chapters shorter.
In everyday life
Look for Stock (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 Stock (geology) in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Stock (geology) 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 Stock (geology) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Stock (geology) in simple terms?

In geology, a stock is an igneous intrusion that has a surface exposure of less than 100 square kilometres (40 sq mi), differing from batholiths only in being smaller. A stock has a discordant relationship with the rocks that it intrudes.

Why does Stock (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 Stock (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 Stock (geology).

Tags

  • Igneous intrusions
  • Igneous petrology stubs
  • Stocks (geology)

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