earth science

Rajmahal Traps

Rajmahal Traps 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 Rajmahal Traps rather than just read about it. In short: The Rajmahal Traps is a volcanic igneous province in Eastern India, covering the parts of Jharkhand, West Bengal and Meghalaya. The Rajmahal Hills of Jharkhand is the type area of this province.

Key takeaways

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

Reference excerpt

The Rajmahal Traps is a volcanic igneous province in Eastern India, covering the parts of Jharkhand, West Bengal and Meghalaya. The Rajmahal Hills of Jharkhand is the type area of this province. Multiple layers of solidified lava made the 608-metre-thick (1,995 ft) Rajmahal Traps which are dipping 2–5° towards the north-east. Individual layers vary in thickness from less than one metre (3 ft 3 in) to more than 70 metres (230 ft).

Genesis These volcanic rocks were formed from the eruptions over the Kerguelen hotspot in the early Cretaceous. The similarity between the geochemical data of Rajmahal volcanos and lavas of the Kerguelen Plateau confirms this. According to plate tectonics, the Indian subcontinent was over this hot spot during the Cretaceous Period. The original lava flow covered an area of nearly 4,100 km2 (1,600 sq mi). Below the Bengal basin the flows cover 200,000 km2 (77,000 sq mi).

Lithology The Rajmahal volcanics are predominantly tholeiitic basalt, quartz tholeiite, olivine tholeiite and alkali basalt. The Intertrappean Beds are composed of sedimentary rock such as siltstone, claystone and shale.

Structural evolution The western boundary of the Rajmahal Traps is faulted and down-thrown towards the east. The eastern boundary of this trap has a North-South trending, fault-controlled basement. This basement connects the Purnea basin of the Ganga valley with the Bengal basin. These faulted contacts, along with the Damodar Gondwana graben, form a triple junction at the mouth of the Bengal basin. The traps evolved along the then eastern continental margin of India, following rifting of Gondwanaland. Over the epochs, the upper part of the lava deformed in a cold, brittle fashion and formed graben structures.

Fossils The Intertrappean Beds contain an assemblage of Lower Cretaceous plant fossils. The assemblage includes Cladophlebis indica, Dictyozamites indicus, Taeniopteris spatulata, and Brachyphyllum rhombium.

Illustrations

Worked examples

Example 1 — a first encounter with Rajmahal Traps

Start with the simplest possible case. Write down what Rajmahal Traps 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 Rajmahal Traps 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 Rajmahal Traps 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 Rajmahal Traps

In research: Rajmahal Traps 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 Rajmahal Traps 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: Rajmahal Traps is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cretaceous volcanism, Extinction events, Geography of Jharkhand, so understanding it makes those chapters shorter.
In everyday life: Look for Rajmahal Traps 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 Rajmahal Traps in 20 minutes

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

Frequently asked questions

What is Rajmahal Traps in simple terms?

The Rajmahal Traps is a volcanic igneous province in Eastern India, covering the parts of Jharkhand, West Bengal and Meghalaya. The Rajmahal Hills of Jharkhand is the type area of this province.

Why does Rajmahal Traps 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 Rajmahal Traps?

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 Rajmahal Traps.