earth science

Hearne Craton

Hearne Craton 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 Hearne Craton rather than just read about it. In short: The Hearne Craton is a craton in northern Canada which, together with the Rae Craton, forms the Western Churchill Province. Hearne is one of the six Archaean cratons of the Canadian Shield (the other being Slave, Rae, Wyoming, Superior, Nain) that are bound together by Palaeoproterozoic orogenic belts.

Key takeaways

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

Reference excerpt

The Hearne Craton is a craton in northern Canada which, together with the Rae Craton, forms the Western Churchill Province. Hearne is one of the six Archaean cratons of the Canadian Shield (the other being Slave, Rae, Wyoming, Superior, Nain) that are bound together by Palaeoproterozoic orogenic belts. Before being merged these six cratons formed independent microcontinents.

Geological setting The Hearne Craton is separated from the Rae Craton by the 2,000 km (1,200 mi)-long Snowbird Tectonic Zone (STZ). During the Neoarchaean and Palaeoproterozoic the STZ played a major role when the Western Churchill Province was first assembled and then reworked. The STZ is a record of Neoarchaean plate tectonics similar in scale to modern orogenic belts. When Laurentia formed at 2.0–1.7 Ga Hearne and Rae formed a central strip to which the Slave, Superior, and Wyoming cratons were accreted. This strip is bounded by a series of orogens: the 1.92–1.69 Ga Trans-Hudson to the south, the 2.0–1.9 Ga Taltson–Thelon and the 1.97–1.84 Ga Wopmey to the west. Hearne and Rae were extensively reworked during the assembly of Laurentia and overlain by Palaeoproterozoic cover sequences. On Hearne the most extensive such cover sequence is a series of continental and marine deposits known as the Hurwitz Group, a series of north-east-trending belts that cover 150,000 km2 (58,000 sq mi). A synclinoria infolded with Archaean basement in central Hearne has a fold-train with a wavelength of 35–45 km (22–28 mi). In the south-western Hearne continental siliciclastic rocks known as the Kiyuk Group overlie the Hurwitz Group. Both groups are covered by a thick cover of thrusts and folds.

Manikewan Ocean The Manikewan Ocean, a palaeocean named by Stauffer 1984, started to open along the south-east margin of Hearne at 2.075 Ga and had reached a width of 5,000 km (3,100 mi) after a hundred million years. Intra-oceanic arc collision resulted in the Amisk Collage and the Flin Flon – Glennie Complex around 1.92–1.88 Ga. Today these Palaeoproterzoic structures in the Trans-Hudson Orogen welds the Archaean Hearne and the Superior cratons. As the ocean continued to close, an Andean-style arc pluton known as the Wathaman Batholith formed 1.86–1.85 Ga. The subduction of the Manikewan Ocean stopped when the La Ronge Arc collided with Hearne. The final closure of the ocean around 1.83 Ga, when Hearne, Superior, and Sask cratons merged with the Flin Flon – Glennie Complex, was followed by a period of metamorphism that peaked around 1.82–1.8 Ga. The Manikewan Mobile Belt now covers an area of 600,000 km2 (230,000 sq mi) but is overlain by Middle Proterozoic Athabasca sandstone.

References

Notes

Sources

Illustrations

Worked examples

Example 1 — a first encounter with Hearne Craton

Start with the simplest possible case. Write down what Hearne Craton 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 Hearne Craton 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 Hearne Craton 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 Hearne Craton

In research: Hearne Craton 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 Hearne Craton 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: Hearne Craton is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cratons, Geology of North America, Historical geology, so understanding it makes those chapters shorter.
In everyday life: Look for Hearne Craton 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Hearne Craton” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Hearne Craton in 20 minutes

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

Frequently asked questions

What is Hearne Craton in simple terms?

Why does Hearne Craton 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 Hearne Craton?

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 Hearne Craton.