Dinosaurs may have been wiped off because of giant impact near India
October 16th, 2009 - 12:47 pm ICT by ANIWashington, October 16 (ANI): If a new study is anything to go by, dinosaurs were killed by a giant impact near India, not Mexico.
In the research, Sankar Chatterjee of Texas Tech University and his team studied the massive Shiva basin, a submerged depression west of India that is intensely mined for its oil and gas resources.
It is probably the largest, multi-ringed impact crater the world has ever seen.
“If we are right, this is the largest crater known on our planet,” Chatterjee said. “A bolide of this size, perhaps 40 kilometers (25 miles) in diameter creates its own tectonics,” he added.
By contrast, the object that struck the Yucatan Peninsula in Mexico, and is commonly thought to have killed the dinosaurs, was between 8 and 10 kilometers (5 and 6.2 miles) wide.
If the team is right, the Shiva impact vaporized Earth’s crust at the point of collision, leaving nothing but ultra-hot mantle material to well up in its place.
It is likely that the impact enhanced the nearby Deccan Traps volcanic eruptions that covered much of western India.
What’s more, the impact broke the Seychelles islands off of the Indian tectonic plate, and sent them drifting toward Africa.
The geological evidence is dramatic.
Shiva’s outer rim forms a rough, faulted ring some 500 kilometers in diameter, encircling the central peak, known as the Bombay High, which would be 3 miles tall from the ocean floor.
Most of the crater lies submerged on India’s continental shelf, but where it does come ashore it is marked by tall cliffs, active faults and hot springs.
The impact appears to have sheared or destroyed much of the 30-mile-thick granite layer in the western coast of India.
The team hopes to go India later this year to examine rocks drill from the center of the putative crater for clues that would prove the strange basin was formed by a gigantic impact.
“Rocks from the bottom of the crater will tell us the telltale sign of the impact event from shattered and melted target rocks. And we want to see if there are breccias, shocked quartz, and an iridium anomaly,” Chatterjee said. (ANI)
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Tags: bolide, bombay high, central peak, chatterjee, continental shelf, deccan traps, gas resources, geological evidence, giant impact, impact crater, indian tectonic plate, mantle material, ocean floor, seychelles islands, tall cliffs, telltale sign, texas tech university, volcanic eruptions, western india, yucatan peninsula
