The sands of time: Continent 'lost' 60 million years ago found b - DC News FOX 5 DC WTTG

The sands of time: Continent 'lost' 60 million years ago found by scientists

Posted: Updated:
(Google / FoxNews.com) (Google / FoxNews.com)

Hidden beneath the brilliant blue waters of the Indian Ocean lies a secret, scientists say: an entire micro-continent that detached itself some 60 million years ago.

And they found it through a few handfuls of sand.

The islands Reunion and Mauritius, both well-known tourist destinations off the southeastern coast of Africa, are hiding the micro-continent, a fragment known as Mauritia that detached while Madagascar and India drifted apart during the Precambrian era, scientists said.

It had been hidden under huge masses of lava. A group of geoscientists from Norway, South Africa, Britain and Germany published a study that suggests, based on the study of lava sand grains from the beach of Mauritius, the existence of further fragments.

The sand grains contain semi-precious zircons aged between 660 million and 1.9 billion years, which is explained by the fact that the zircons were carried by the lava as it pushed through subjacent continental crust of this age.

"We found zircons that we extracted from the beach sands, and these are something you typically find in a continental crust. They are very old in age," Prof. Trond Torsvik, from the University of Oslo, Norway, told the BBC.

Three-quarters of a billion years ago, the surface of the Earth looked very different than it does today; the planet's continents were joined in a vast supercontinent called Rodinia. And at the time, India nestled up against the island of Madagascar.

It seems Mauritia was sandwiched between the two.

And it may not have been alone: Such micro-continents in the oceans seem to occur more frequently than previously thought, according to Torsvik's study.

The break-up of continents is often associated with mantle plumes: giant bubbles of hot rock that rise from the deep mantle and soften the tectonic plates from below, until the plates break apart at the hotspots.

Eastern Gondwana -- another early supercontinent -- broke apart about 170 million years ago in just such a process, the scientists say. At first, one part was separated, which in turn fragmented into Madagascar, India, Australia and Antarctica, which then migrated to their present position.

Plumes currently situated underneath the islands Marion and Reunion appear to have played a role in the emergence of the Indian Ocean.

This dating method was supplemented by a recalculation of plate tectonics, which explains exactly how and where the fragments ended up in the Indian Ocean. Bernhard Steinberger of the GFZ German Research Centre helped calculate the hotspot trail.

"The continent fragments continued to wander almost exactly over the Reunion plume, which explains how they were covered by volcanic rock," he said.

Read more: http://www.foxnews.com/science/2013/02/25/lost-continent-discovered-beneath-indian-ocean/?test=latestnews&intcmp=features#ixzz2M0VYLcvW

  • Viral StoriesMore>>

  • Spacewalking astronauts release baby satellite

    Spacewalking astronauts release baby satellite

    Monday, August 18 2014 12:40 PM EDT2014-08-18 16:40:07 GMT
    CAPE CANAVERAL, Fla. (AP) -- Spacewalking astronauts launched a tiny Peruvian research satellite Monday, setting it loose on a mission to observe Earth. Russian Oleg Artemiev cast the 4-inch box off with his gloved right hand as the International Space Station sailed 260 miles above the cloud-flecked planet. The nanosatellite gently tumbled as it cleared the vicinity of the orbiting complex, precisely as planned. "One, two, three," someone called out in Russian as Artemiev let go of the sate...
    CAPE CANAVERAL, Fla. (AP) -- Spacewalking astronauts launched a tiny Peruvian research satellite Monday, setting it loose on a mission to observe Earth. Russian Oleg Artemiev cast the 4-inch box off with his gloved right hand as the International Space Station sailed 260 miles above the cloud-flecked planet. The nanosatellite gently tumbled as it cleared the vicinity of the orbiting complex, precisely as planned. "One, two, three," someone called out in Russian as Artemiev let go of the sate...
  • New marijuana drug 'Wax' looks and feels like lip balm

    New marijuana drug 'Wax' looks and feels like lip balm

    Monday, August 18 2014 12:39 PM EDT2014-08-18 16:39:19 GMT
    It goes by the name Wax, Butter and Honeycomb on the streets, and it can pack a kick equal to 15 to 20 joints of marijuana. The new drug looks and feels like lip balm. It's made from the oils of marijuana plants and has a high level of THC - the chemical that produces a high.
    It goes by the name Wax, Butter and Honeycomb on the streets, and it can pack a kick equal to 15 to 20 joints of marijuana. The new drug looks and feels like lip balm. It's made from the oils of marijuana plants and has a high level of THC - the chemical that produces a high.
  • Pilot's artificial arm detached while landing

    Pilot's artificial arm detached while landing

    Thursday, August 14 2014 10:21 AM EDT2014-08-14 14:21:31 GMT
    LONDON (AP) -- A British air accident report has recounted how a pilot lost control of a passenger plane after his artificial arm became detached during landing. The report says the incident took place as the Flybe flight from Birmingham, carrying 47 passengers, was approaching Belfast City Airport in gusty conditions in February. The 46-year-old pilot had shortly before checked that his prosthetic lower left arm was securely attached to the yoke clamp, but as he performed a maneuver just be...
    LONDON (AP) -- A British air accident report has recounted how a pilot lost control of a passenger plane after his artificial arm became detached during landing. The report says the incident took place as the Flybe flight from Birmingham, carrying 47 passengers, was approaching Belfast City Airport in gusty conditions in February. The 46-year-old pilot had shortly before checked that his prosthetic lower left arm was securely attached to the yoke clamp, but as he performed a maneuver just be...
Powered by WorldNow
Untitled

WTTG FOX 5 & myfoxdc
5151 Wisconsin Ave. NW
Washington, DC 20016
Main Number: (202) 244-5151
Newsroom: (202) 895-3000
fox5tips@wttg.com

Didn't find what you were looking for?
All content © Copyright 2000 - 2014 Fox Television Stations, Inc. and Worldnow. All Rights Reserved.
Privacy Policy | New Terms of Service What's new | Ad Choices