Deccan Traps

Deccan Traps
Deccan Traps Location in India

The Deccan Traps is a large igneous province of west-central India (17–24°N, 73–74°E). It is one of the largest volcanic features on Earth, taking the form of a large shield volcano.^[2] It consists of numerous layers of solidified flood basalt that together are more than about 2,000 metres (6,600 ft) thick, cover an area of about 500,000 square kilometres (200,000 sq mi),^[3] and have a volume of about 1,000,000 cubic kilometres (200,000 cu mi).^[4] Originally, the Deccan Traps may have covered about 1,500,000 square kilometres (600,000 sq mi),^[5] with a correspondingly larger original volume. This volume overlies the Archean age Indian Shield, which is likely the lithology the province passed through during eruption. The province is commonly divided into four subprovinces: the main Deccan, the Malwa Plateau, the Mandla Lobe, and the Saurashtran Plateau.^[6]

The eruptions occurred over a 600-800,000 year time period between around 65.6 to 66.3 million years ago, spanning the Cretaceous–Paleogene boundary. While some authors have suggested that the eruptions were the primary cause Cretaceous–Paleogene mass extinction event, which dates to around 66.05 million years ago,^[7] this has been strongly disputed, with many authors suggesting that the Chicxulub impact was the primary cause of the extinction,^[8][9][10] with some suggesting that the role in of the Deccan Traps in the extinction may have been negligible or even ameliorating.^[10][9]

The Deccan Traps are thought to have been produced in major part by the still active Réunion hotspot, responsible for the creation of the modern Mascarene Islands in the Indian Ocean.^[11]