Tips and Tricks

What type of rock is found in Deccan Trap region?

What type of rock is found in Deccan Trap region?

4.3 Deccan Traps Basalt. The Deccan Traps flow basalt (65 Ma) is one of the largest volcanic features on Earth, and crops out over 500,000 sq. km of the west-central Indian subcontinent. The trap complex is predominantly composed of multiple layers of tholeiitic flood basalt.

What are Bagh beds?

The Bagh Beds which include the Nimar Sandstone overlie the granitoid and metamorphic rocks of Precambrian age and are in turn overlain by the Deccan basalts. Both Lameta and Bagh Beds can be seen as isolated outcrops all along the Narmada Valley.

Where is rajmahal volcanic basin?

eastern Jharkhand state
The Rajmahal basalts form a low-lying group of hills in eastern Jharkhand state, previously southern Bihar (24°15′ to 25°15′N, 87°20′ to 87°45′E) [Fig. 2; Ball (1877)]. They consist mainly of quartz-normative tholeiites interbedded with thin bentonites or tuffs (Sengupta, 1988).

Why does the Deccan Trap have igneous rocks?

The black soil area in the peninsular plateau is called the Deccan Trap. This is formed by volcanic activities, so the rocks are igneous. Due to continuous flow of lava an extensive lava plateau has been formed known as Deccan Trap.

What type of rock is basalt?

Basalt is a hard, black volcanic rock. Basalt is the most common rock type in the Earth’s crust. Depending on how it is erupted, basalt can be hard and massive (Figure 1) or crumbly and full of bubbles (Figure 2).

Which fossils are found in Rajmahal Traps?

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

Which soil is found in Rajmahal Hills?

Laterite soil
Which soil is found in Rajmahal hills? Laterite soil rich in iron and aluminium and which forms in hot and wet tropical areas is found in the Rajmahal Hills.

Which monument is made up of igneous rock?

Fort Raigad and Ellora sculpture are made up of Igneous rocks.

What is the difference between Deccan trap and Deccan plateau?

The Deccan Plateau, a Precambrian shield, is partially covered by the Deccan Traps, a large igneous province. The northwestern part of the plateau is made up of lava flows or igneous rocks known as the Deccan Traps.

What rock turns into marble?

When limestone, a sedimentary rock, gets buried deep in the earth for millions of years, the heat and pressure can change it into a metamorphic rock called marble.

Is granite a basalt?

Basalt and granite are similar in the they are both igneous, silicate rocks and common on Earth. They also have numerous differences. Basalt is extrusive, mafic, and common throughout the Solar System whereas granite is intrusive, felsic, and common only on Earth.

How is Rajmahal trap formed?

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. The original lava flow covered an area of nearly 4,100 km2 (1,600 sq mi).

What type of rock is shale?

Shale is a fine-grained sedimentary rock that forms from the compaction of silt and clay-size mineral particles that we commonly call “mud.”. This composition places shale in a category of sedimentary rocks known as “mudstones.”. Shale is distinguished from other mudstones because it is fissile and laminated.

How are oil and gas trapped in shale rock?

The oil and natural gas migrated out of the shale and upwards through the sediment mass because of their low density. The oil and gas were often trapped within the pore spaces of an overlying rock unit such as a sandstone (see illustration).

What is a black organic shale?

Black organic shales are the source rock for many of the world’s most important oil and natural gas deposits. These shales obtain their black color from tiny particles of organic matter that were deposited with the mud from which the shale formed.

What type of shale is black and Gray in color?

Black and Gray Shale. The Barnett Shale, Marcellus Shale, Haynesville Shale, Fayetteville Shale, and other gas-producing rocks are all dark gray or black shales that yield natural gas. The Bakken Shale of North Dakota and the Eagle Ford Shale of Texas are examples of shales that yield oil.