Table of Contents
- 1 Which type of volcanic eruption caused Deccan trap?
- 2 How was Deccan Plateau formed?
- 3 What is Deccan volcanism?
- 4 Which type of rocks composed the Deccan trap region of the peninsular plateau?
- 5 What are found in Deccan Traps?
- 6 What are the Deccan Traps made of?
- 7 How did the Deccan tarps lead to the extinction of dinosaurs?
- 8 What type of molluscs are found in The Infratrappean beds?
Which type of volcanic eruption caused Deccan trap?
Answer: Caldera type of volcanic eruption has caused deccan trap formation. Explanation: Calderas are the volcanoes that are most explosive.
Is Deccan Plateau intraplate volcanism?
Voluminous intraplate volcanic areas such as the Deccan Trapps of India, the Columbia Plateau basalts, the Paraná Basin lavas, and the Siberian Trapps are called “flood basalt” provinces. Individual, usually horizontal lava flows may reach up to fifty meter thickness.
How was Deccan Plateau formed?
It was formed by volcanic activity that lasted millions of years, causing the deposition of lava. After the volcanoes became extinct, the layers of lava transformed into a region of highland known as the Deccan plateau.
Which type of lava flow is found in Deccan region?
basalt lava flows
The Deccan Plateau consists of more than 2000 m-thick succession of flat-lying basalt lava flows and covers an area of nearly 500 000 km2.
What is Deccan volcanism?
Deccan volcanism produced the longest lava mega-flows on Earth, spanning over 1500 km from the main Deccan province across India to Rajahmundry and out into the Gulf of Bengal. Four to five of these longest lava flows occurred just prior to the KTB mass extinction.
Why are Deccan Traps called traps?
The term trap has been used in geology since 1785–1795 for such rock formations. It is derived from the Swedish word for stairs (trapp) and refers to the step-like hills forming the landscape of the region.
Which type of rocks composed the Deccan trap region of the peninsular plateau?
The northwestern part of the plateau is made up of lava flows or igneous rocks known as the Deccan Traps. The rocks are spread over the whole of Maharashtra, thereby making it one of the largest volcanic provinces in the world.
Which type of rocks composed the Deccan Trap region of the Peninsular plateau?
What are found in Deccan Traps?
Within the Deccan Traps at least 95\% of the lavas are tholeiitic basalts. Other rock types present include: alkali basalt, nephelinite, lamprophyre, and carbonatite. Mantle xenoliths have been described from Kachchh (northwestern India) and elsewhere in the western Deccan.
What is Deccan Trap?
Filters. A very large region of thick basaltic rock located in west-central India and associated with one of the largest volcanic eruptions in the history of the earth. The eruption took place approximately 65 million years ago and is thought to have contributed to the extinction of dinosaurs.
What are the Deccan Traps made of?
It consists of a composite thickness of more than 6,500 feet (>2,000 m) of flat-lying basalt lava flows and covers an area of nearly 200,000 square miles (500,000 square km) (roughly the size of the states of Washington and Oregon combined) in west-central India.
How were the Deccan Traps formed?
The plume melted through the Indian craton causing massive volcanism leading to the deposition of the basalt layers that are known as the Deccan Traps. The traps were created over 500,000 years by non-explosive basaltic flows, analogous to modern eruptions in Iceland or Hawaii.
How did the Deccan tarps lead to the extinction of dinosaurs?
Most of the basalt was erupted between 65 and 60 million years ago. Gases released by the eruption may have changed the global climate and lead to the demise of the dinosaurs 65 million years ago. This photo shows the Deccan Tarps between Mambai and Mahabaleshwar.
How did the spreading rate of Deccan volcanoes change over time?
The spreading rate rapidly increased and reached a maximum at the same time as the peak basaltic eruptions. The spreading rate then dropped off, with the decrease occurring around 63 million years ago, by which time the main phase of Deccan volcanism ended. This correlation is seen as driven by plume dynamics.
What type of molluscs are found in The Infratrappean beds?
The Infratrappean Beds (Lameta Formation) and Intertrappean Beds also contain fossil freshwater molluscs. It is postulated that the Deccan Traps eruption was associated with a deep mantle plume.