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>>

  • New app helps teens calm anxiety

    New app helps teens calm anxiety

    Monday, July 28 2014 11:46 AM EDT2014-07-28 15:46:49 GMT
    Anxiety disorders affect one in eight teens. There are medications and therapies that can help alleviate symptoms, and now there’s even an app that can help. The MindShift app aims to teach young adults how to combat everyday anxiety, panic, conflict and worry. Teens can input their symptoms and the app will create a plan to help reduce stress. Created by two non-profit organizations, Anxiety BC and BC Mental Health and Addiction Services, the Mindshift app gives users the ability to ...
    Anxiety disorders affect one in eight teens. There are medications and therapies that can help alleviate symptoms, and now there’s even an app that can help. The MindShift app aims to teach young adults how to combat everyday anxiety, panic, conflict and worry. Teens can input their symptoms and the app will create a plan to help reduce stress. Created by two non-profit organizations, Anxiety BC and BC Mental Health and Addiction Services, the Mindshift app gives users the ability to ...
  • Toddler crashes Jeep, runs home to watch cartoons

    Toddler crashes Jeep, runs home to watch cartoons

    Monday, July 28 2014 9:07 AM EDT2014-07-28 13:07:54 GMT
    MYRTLE CREEK, Ore. (AP) -- Police say a toddler crashed a Jeep into an Oregon home, then ran back to his home to watch cartoons. Authorities say the 3-year-old boy who was wearing only a diaper climbed into the Jeep Tuesday evening and knocked it out of gear. Witnesses say it rolled down the street, through an intersection and into the house, causing minor damage. KPTV reports (http://bit.ly/1rhWlK6 ) an officer found the boy on a couch watching TV as if nothing had happened. He said his par...
    MYRTLE CREEK, Ore. (AP) -- Police say a toddler crashed a Jeep into an Oregon home, then ran back to his home to watch cartoons. Authorities say the 3-year-old boy who was wearing only a diaper climbed into the Jeep Tuesday evening and knocked it out of gear. Witnesses say it rolled down the street, through an intersection and into the house, causing minor damage. KPTV reports (http://bit.ly/1rhWlK6 ) an officer found the boy on a couch watching TV as if nothing had happened. He said his par...
  • Former contractor says she was attacked by rats at DC's Providence Hospital

    Former contractor says she was attacked by rats at DC's Providence Hospital

    Friday, July 25 2014 11:03 AM EDT2014-07-25 15:03:00 GMT
    It is an odd and very disturbing story. A hospital contractor in Northeast D.C. was attacked by rats on the job and they are the same rats she says are eating bodies in the morgue.
    It is an odd and very disturbing story. A hospital contractor in Northeast D.C. was attacked by rats on the job and they are the same rats she says are eating bodies in the morgue.
Powered by WorldNow

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 | Terms of Service | Ad Choices