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'Lost continent' found under Mauritius


Scientists have confirmed the existence of a "lost continent" under the Indian Ocean island of Mauritius that was left-over by the break-up of the supercontinent, Gondwana, which started about 200 million years ago.The piece of crust, which was subsequently covered by young lava during volcanic eruptions on the island, seems to be a tiny piece of ancient continent, which broke off from the island of Madagascar, when Africa, India, Australia and Antarctica split up and formed the Indian Ocean.

'Lost continent' found under Mauritius
Lead author Prof. Lewis D. Ashwal studying an outcropping of trachyte rocks in Mauritius. Such samples are about 
6 million years old, but surprisingly contain zircon grains as old as 3000 million years 
[Credit: Susan Webb/Wits University]
"We are studying the break-up process of the continents, in order to understand the geological history of the planet," says Wits geologist, Professor Lewis Ashwal, lead author on the paper "Archaean zircons in Miocene oceanic hotspot rocks establish ancient continental crust beneath Mauritius", published in the prestigious journal Nature Communications.

By studying the mineral, zircon, found in rocks spewed up by lava during volcanic eruptions, Ashwal and his colleagues Michael Wiedenbeck from the German Research Centre for Geosciences (GFZ) and Trond Torsvik from the University of Oslo, guest scientist at GFZ, have found that remnants of this mineral were far too old to belong on the island of Mauritius.

"Earth is made up of two parts - continents, which are old, and oceans, which are "young". On the continents you find rocks that are over four billion years old, but you find nothing like that in the oceans, as this is where new rocks are formed," explains Ashwal. "Mauritius is an island, and there is no rock older than 9 million years old on the island. However, by studying the rocks on the island, we have found zircons that are as old as 3 billion years."

'Lost continent' found under Mauritius
Indian Ocean topography showing the location of Mauritius as part of a chain of progressively older 
volcanoes extending from the presently active hot-spot of Reunion toward the 65-million-year-old 
Deccan traps of northwest India [Credit: Wits University]
Zircons are minerals that occur mainly in granites from the continents. They contain trace amounts of uranium, thorium and lead, and due to the fact that they survive geological process very well, they contain a rich record of geological processes and can be dated extremely accurately.

"The fact that we have found zircons of this age proves that there are much older crustal materials under Mauritius that could only have originated from a continent," says Ashwal.

This is not the first time that zircons that are billions of years old have been found on the island. A study done in 2013 has found traces of the mineral in beach sand. However, this study received some criticism, including that the mineral could have been either blown in by the wind, or carried in on vehicle tyres or scientists' shoes.

'Lost continent' found under Mauritius
Variably sized crystals of alkali feldspar like the large white one at lower left are aligned by magmatic flow. A large zircon
 crystal appears as the brightly coloured grain just right of centre [Credit: Wits University]
"The fact that we found the ancient zircons in rock (6-million-year-old trachyte), corroborates the previous study and refutes any suggestion of wind-blown, wave-transported or pumice-rafted zircons for explaining the earlier results," says Ashwal.

Ashwal suggests that there are many pieces of various sizes of "undiscovered continent", collectively called "Mauritia", spread over the Indian Ocean, left over by the breakup of Gondwanaland.

"According to the new results, this break-up did not involve a simple splitting of the ancient super-continent of Gondwana, but rather, a complex splintering took place with fragments of continental crust of variable sizes left adrift within the evolving Indian Ocean basin."


Gondwanaland

Gondwanaland is a super-continent that existed more than 200 million years ago and contained rocks as old as 3.6 billion years old, before it split up into what are now the continents of Africa, South America, Antarctica, India and Australia. The split-up occurred because of the geological process of plate tectonics. This is the process where the ocean basin is in continuous motion, and moves between 2 cm and 11 cm per year. Continents ride on the plates that make up the ocean floor, which causes the movement of the continents.

Mauritius

Known as a tropical holiday destination, Mauritius is a volcanic island, formed by the eruption of volcanoes starting at about nine million years ago. The island forms part of a string of islands, formed by a stationary hotspot (volcano), presently located at Réunion Island. Originating from deep within the earth, the hotspot stays stationary while the ocean’s tectonic plates move across it, creating a string of volcanic islands.

Source: Wits University [January 31, 2017]
TANN

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1 comment :

  1. Out Standing Research .. in the late 1950's I trekked the Marathon Basin and what we knew then. What a difference, advancement! I'm so glad I lived long enough to have read this article. Thanks.

    ReplyDelete


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