earth science

Magellan Seamounts

Magellan Seamounts 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 Magellan Seamounts rather than just read about it. In short: The Magellan Seamounts (also known as Magellan Seamount Group and previously called Magellan Rise ) stretch from the Mariana Trench to Ita Mai Tai Guyot. Geological studies have demonstrated unique features with implications on understanding of ocean island basalt volcanism.

Key takeaways

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

Reference excerpt

The Magellan Seamounts (also known as Magellan Seamount Group and previously called Magellan Rise ) stretch from the Mariana Trench to Ita Mai Tai Guyot. Geological studies have demonstrated unique features with implications on understanding of ocean island basalt volcanism. Contracts exist with the International Seabed Authority to exploit the areas potential mineral wealth.

Geography The Magellan Seamounts extend from 11.0°N 151.0°E / 11.0; 151.0 to 18.0°N 157.0°E / 18.0; 157.0 They include:

Govorov Guyot 18°00.25′N 151°13.50′E 121 ± 2.8 to 98.5 ± 1.4 Ma Ioah Seamount (also known as Ioah Guyot, Ioan Seamount or Fedorov Seamount) 14°06.00′N 156°08.40′E 87 million years old Pako Guyot 15°42.83′N 155°11.96′E 92 million years old but volcanics have been now dated in range 112 to 86 Ma and < 20 Ma in smaller volcanoes on the guyot. Vlinder Guyot (also known as Alba Guyot) 16°57.61′N 154°16.63′E 95 million years old Ita Mai Tai Guyot 12°51.00′N 156°46.20′E 118 million years old

Geology The volcanoes are part of a hotspot chain whose formation ages are in the range 121 to 86 million years ago. However recently sampling has shown secondary volcanic activity at about 20 million years ago. Pako Guyot, which is quite large, is to date the only ocean island basalt seamount where two quite distinct mantle plume components have been discovered in one seamount, being an extreme high μ = 238U/204Pb mantle (HIMU) and enriched mantle 1 (EM1) component. These are respectively suggestive of associations with the Arago hotspot and/or the Rarotonga hotspot and make a previously suggested association with the Samoa hotspot less likely. Given their age the guyots have also had sedimentary deposits which have been characterised as reef and planktonic limestones. They are of interest for their mineral potential, for example with cobalt containing ferromanganese nodule deposits.

Worked examples

Example 1 — a first encounter with Magellan Seamounts

Start with the simplest possible case. Write down what Magellan Seamounts 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 Magellan Seamounts 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 Magellan Seamounts 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 Magellan Seamounts

In research: Magellan Seamounts 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 Magellan Seamounts 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: Magellan Seamounts is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cretaceous volcanoes, Guyots, Hotspot tracks, so understanding it makes those chapters shorter.
In everyday life: Look for Magellan Seamounts 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 Magellan Seamounts in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Magellan Seamounts 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 Magellan Seamounts out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Magellan Seamounts in simple terms?

Why does Magellan Seamounts 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 Magellan Seamounts?

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 Magellan Seamounts.