earth science

Transamazonian orogeny

Transamazonian orogeny 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 Transamazonian orogeny rather than just read about it. In short: The Transamazonian orogeny was a mountain building event in the Paleoproterozoic, affecting what is now the São Francisco Craton and Guyana Shield. During the orogeny from 2.14 to 1.94 billion years ago two small Archean proto-continents—including the greenstone belt-dominated Gavião Block and the calc-alkaline charnockite and enderbite-dominated Jequié Block—collided.

Key takeaways

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

Reference excerpt

The Transamazonian orogeny was a mountain building event in the Paleoproterozoic, affecting what is now the São Francisco Craton and Guyana Shield. During the orogeny from 2.14 to 1.94 billion years ago two small Archean proto-continents—including the greenstone belt-dominated Gavião Block and the calc-alkaline charnockite and enderbite-dominated Jequié Block—collided. The Contendas-Jacobina Lineament represents a suture zone where the collision occurred and the Gavião Block partially subducted under the Jequié Block. At the same time, another small continental fragment, the Serrinha Block, may have collided as well and was extensively reworked and metamorphosed, with orthogneiss and migmatite reaching amphibolite-grade on the sequence of metamorphic facies. The Serrinha Block is the basement rock of the Rio Itapicuru granite-greenstone belt. Several magmatic arcs formed between the colliding proto-continent blocks, including the Salvador-Curaçá Belt, Contendas-Mirante Belt, Jacobina-Mundo Novo Belt and Itabuna-Atlantic Belt. To the west of the Gavião Block, the Guanambi-Urandi Batholith formed with monzonite, granite intrusions and syenite, which was subsequently covered by Neoproterozoic sedimentary rocks. In the Guyana Shield, the Transamazonian orogeny resulted in refolding and reactivation of older tectonic features from the Guriense orogeny, producing horst and graben areas and intense pyroclastic ignimbrite and rhyolite eruptions.

See also Geology of Brazil Geology of Guyana List of orogenies

References

Worked examples

Example 1 — a first encounter with Transamazonian orogeny

Start with the simplest possible case. Write down what Transamazonian orogeny 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 Transamazonian orogeny 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 Transamazonian orogeny 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 Transamazonian orogeny

In research: Transamazonian orogeny 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 Transamazonian orogeny 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: Transamazonian orogeny is common in secondary-school and first-year university syllabi. It links to neighbouring topics Archean orogenies, Geological process stubs, Geology of South America, so understanding it makes those chapters shorter.
In everyday life: Look for Transamazonian orogeny 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.

Affiliate

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

How to study Transamazonian orogeny in 20 minutes

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

Frequently asked questions

What is Transamazonian orogeny in simple terms?

Why does Transamazonian orogeny 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 Transamazonian orogeny?

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 Transamazonian orogeny.