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Temagami Magnetic Anomaly

Temagami Magnetic Anomaly 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 Temagami Magnetic Anomaly rather than just read about it. In short: The Temagami Magnetic Anomaly, also called the Temagami Anomaly or the Wanapitei Anomaly, is a magnetic anomaly resulting from a large buried geologic structure in the Canadian Shield near Temagami, Ontario, Canada. It stretches from Lake Wanapitei in the west to Bear Island in Lake Temagami.

Temagami Magnetic Anomaly — main illustration
Temagami Magnetic Anomaly — illustration

Key takeaways

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

Reference excerpt

The Temagami Magnetic Anomaly, also called the Temagami Anomaly or the Wanapitei Anomaly, is a magnetic anomaly resulting from a large buried geologic structure in the Canadian Shield near Temagami, Ontario, Canada. It stretches from Lake Wanapitei in the west to Bear Island in Lake Temagami. The Indigenous community of Teme-Augama Anishnabai lies partly within the Temagami Magnetic Anomaly, including the Temagami First Nation on Bear Island. Located nearby are a number of other geological structures, including the Sudbury Basin, the Lake Wanapitei impact crater, and the Temagami Greenstone Belt.

Discovery and structure

The Temagami Magnetic Anomaly is egg-shaped, 58 km (36 mi) long and 19 km (12 mi) wide. The central section has the greatest amplitude and an east–west strike. The Temagami Magnetic Anomaly was first found in the late 1940s during a magnetic survey by Norman Bell Keevil. The western portion appears smoother in character while the eastern section is long and narrow. With an areal extent of 50 x 15 km, it reaches a magnitude of approximately 10,000 nanoteslas, making it one of the largest positive anomalies in North America. The eastern section coincides with a small positive gravity anomaly, indicating the presence of dense rocks at depth. The anomaly was discovered by a magnetic survey and a gravity survey. In 2014, a 2200m borehole was drilled at Afton Township where the anomaly is at its maximum. Analysis of the lowest most rocks indicated similarities with the quartz diorite dykes found at the Sudbury Igneous Complex, which were likely created at the same time as the Sudbury impact event.

See also Maple Mountain (Ontario) Bangui magnetic anomaly Kursk Magnetic Anomaly Ishpatina Ridge

References

Illustrations

Temagami Magnetic Anomaly: Landsat image showing the anomaly, cross is at the centre of it. Shows the terrain only, not the magnetic deviations of the area.
Landsat image showing the anomaly, cross is at the centre of it. Shows the terrain only, not the magnetic deviations of the area.
Temagami Magnetic Anomaly: The Anomaly on a map, the larger pink spot near the center of the image.
The Anomaly on a map, the larger pink spot near the center of the image.

Worked examples

Example 1 — a first encounter with Temagami Magnetic Anomaly

Start with the simplest possible case. Write down what Temagami Magnetic Anomaly 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 Temagami Magnetic Anomaly 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 Temagami Magnetic Anomaly 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 Temagami Magnetic Anomaly

In research
Temagami Magnetic Anomaly 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 Temagami Magnetic Anomaly 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
Temagami Magnetic Anomaly is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geology of Temagami, Magnetic anomalies, so understanding it makes those chapters shorter.
In everyday life
Look for Temagami Magnetic Anomaly 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 Temagami Magnetic Anomaly in 20 minutes

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

Frequently asked questions

What is Temagami Magnetic Anomaly in simple terms?

The Temagami Magnetic Anomaly, also called the Temagami Anomaly or the Wanapitei Anomaly, is a magnetic anomaly resulting from a large buried geologic structure in the Canadian Shield near Temagami, Ontario, Canada. It stretches from Lake Wanapitei in the west to Bear Island in Lake Temagami.

Why does Temagami Magnetic Anomaly 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 Temagami Magnetic Anomaly?

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 Temagami Magnetic Anomaly.

Tags

  • Geology of Temagami
  • Magnetic anomalies

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