earth science

Shan–Thai terrane

Shan–Thai terrane 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 Shan–Thai terrane rather than just read about it. In short: The Shan–Thai or Sibumasu terrane was a microcontinent which extended from Lhasa (Tibet) West Yunnan, Myanmar, West Thailand, much of Malaysia and Sumatra. It was an archipelago with landmasses which shared a similar geological history.

Key takeaways

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

Reference excerpt

The Shan–Thai or Sibumasu terrane was a microcontinent which extended from Lhasa (Tibet) West Yunnan, Myanmar, West Thailand, much of Malaysia and Sumatra. It was an archipelago with landmasses which shared a similar geological history. The Shan–Thai terrane rifted from Australian plate part of Gondwana in the Permian. It collided with the Indochina and South China terranes almost simultaneously in the Middle Triassic. Shan–Thai is c. 4,000 km (2,500 mi) long and bounded by the Indochina terrane to the east and the South China terrane to the north. Today Shan-Thai and Indochina form mainland Southeast Asia (the Indochinese Peninsula) but with original palaeo-geographic positions may have been different and their geologic histories also differ. Its Early Ordovician faunas show affinity with North China-Korea-Australia part of Gondwana on the palaeo-equator, but its Late Ordovician fossils and sedimentary facies have affinity with the South China block. Fortey & Cocks (1998) suggest that North and South China might not have been far as previously proposed and that Sibumasu, which was most similar to South China, may have moved away from North China/Australia towards South China and came to be close to it over the Ordovician. Shan–Thai was an archipelago on the Paleo-Tethys Ocean spread over several latitudes. It can therefore be subdivided into several portions with different palaeo-geographic histories. The internal "Thai" elements, bordering the Indochina block, are of Cathaysian type and characterised by palaeo-tropical warm-water facies. The external "Shan" part has Gondwanan cold-water facies whilst the central "Sibumasu" part is transitional between the other two. The internal parts of Shan–Thai merged with Laurasia 265 Ma when the Nan-Uttaradit suture closed. Oceanic basins separated the other elements of Shan–Thai until the Late Triassic–Early Jurassic Late Indochina Orogeny. The collision between the Indian plate and the Eurasian plate during the Oligocene and Miocene resulted in clockwise rotation of southwest Asia, severe deformation of southeast Asia, and the extrusion of Shan–Thai and Indochina blocks. These two blocks are still crisscrossed by the faults from this collision.

Worked examples

Example 1 — a first encounter with Shan–Thai terrane

Start with the simplest possible case. Write down what Shan–Thai terrane 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 Shan–Thai terrane 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 Shan–Thai terrane 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 Shan–Thai terrane

In research: Shan–Thai terrane 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 Shan–Thai terrane 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: Shan–Thai terrane is common in secondary-school and first-year university syllabi. It links to neighbouring topics Historical geology, Historical tectonic plates, Palaeogeography stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Shan–Thai terrane 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 Shan–Thai terrane in 20 minutes

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

Frequently asked questions

What is Shan–Thai terrane in simple terms?

Why does Shan–Thai terrane 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 Shan–Thai terrane?

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 Shan–Thai terrane.