Does Earth's Middle Mantle Hold Oceans Of Water?

Japanese and German researchers have found evidence that suggests the middle of Earth’s mantle holds as much water as the planet’s oceans.


(Mantle Transition Zone (MTZ) depth of 410 to 660 km )

An open question for solid-earth scientists is the amount of water in Earth’s interior. The uppermost mantle and lower mantle contain little water because their dominant minerals, olivine and bridgmanite, have limited water storage capacity. In contrast, the mantle transition zone (MTZ) at a depth of 410 to 660 km is considered to be a potential water reservoir because its dominant minerals, wadsleyite and ringwoodite, can contain large amounts of water [up to 3 weight % (wt %)].

However, the actual amount of water in the MTZ is unknown. Given that water incorporated into mantle minerals can lower their viscosity, we evaluate the water content of the MTZ by measuring dislocation mobility, a property that is inversely proportional to viscosity, as a function of temperature and water content in ringwoodite and bridgmanite. We find that dislocation mobility in bridgmanite is faster by two orders of magnitude than in anhydrous ringwoodite but 1.5 orders of magnitude slower than in water-saturated ringwoodite.

To fit the observed mantle viscosity profiles, ringwoodite in the MTZ should contain 1 to 2 wt % water. The MTZ should thus be nearly water-saturated globally.

Science fiction writer Stephen Baxter has created a series of novels, starting with Flood, that describe a near-future Earth in which the oceans are rising. In the story, global warming melts ice sheets, which raises ocean levels. However, the water keeps rising. With the weight of ice removed, Earth's inner water rises. I'm not going to reveal what happens.

Via NextBigFuture.

Scroll down for more stories in the same category. (Story submitted 5/23/2017)

Follow this kind of news @Technovelgy.

| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |

Would you like to contribute a story tip? It's easy:
Get the URL of the story, and the related sf author, and add it here.

Comment/Join discussion ( 0 )

Related News Stories - (" Engineering ")

Seabreacher, H.G. Winter's 1939 Torpoon
'Ken lay full-length in the padded body compartment, his feet resting on the controlling bars of the directional planes, hands on the torpoon's engine levers.' - HG Winters, 1939.

Project Soli Radar Gesture Chip Now FCC Approved
'He waved his hand and the circuit switched abruptly.' - Philip K. Dick, 1955.

Implosion Fabrication Shrinks 3D Objects To Nanoscale
'Carter had watched miniaturization a hundred times...' - Isaac Asimov, 1965.

ODYSSEUS Solar-Powered Stratospheric Plane Flies Forever
'The planes flew continuously, twenty-four hours a day...' - EB White, 1950.

 

Google
  Web TechNovelgy.com   

Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Invention Timeline, or see what's New.

 

 

 

 

 

Current News

Datagrid Model Generation Perfect For Eternal Cities Of Science Fiction
'... there was enough flexibility to allow for wide variation.

Kazahk Ironist Protester Arrested For Blank Sign Protest
'...a man carried a white rectangular sign, blank on both sides.'

Bitcoin Surges Again, To $7,000
'... electronic, private cash, unbacked by any government, untraceable, completely anonymous.'

China Develops Taste Testing Robots
'Install taste buds in the end of one tentacle...'

North Sea Stone Age Reconstruction And Philip K Dick
'Your Dip digs back into antiquity. Rome. Greece. Dust and old volumes.'

Tesla Robotaxis Will Automatically Recharge Themselves
'Then it appeared to make up its mind, and trundled over to a wall socket...'

New Lifelike Material Powered By Artificial Metabolism
'... The biological robots were not living creatures.'

Husqvarna Automower 435X AWD
'Gramp Stevens sat in a lawn chair, watching the mower at work...'

Elon Musk Foretells Tesla Sans Steering Wheel
'How about the steering wheel... I don't need one.'

Adversarial Patches Trick Computer Vision
'The surveillance cameras can all see it, but then they forget they’ve seen it.'

Amazon Warehouse Computer Can Fire People Now
'The system has already fired five people...'

BrainEx Restores Some Activity To Severed Pig Head
'... they placed the brain in a special solution, having all the properties of Nursing the brain cells.'

Yes, But Do Astrobees Have Lasers For Lightsaber Training?
'... Ancient weapons are no match for a good blaster at your side, kid.'

'Young Razorbacks Before Their Katanas Grow In'
'Twin robotic arms with gleaming three-foot sword blades unfolded from the forward hydraulic assemblies...'

A New Way To Run Into Things
'He made an adjustment, pointed the tube at the wall beside Etzwane, and projected a cone of light.'

'Metallic Wood' Strong Like Titanium, Floats In Water
'A metal... light as cork and stronger than steel...'

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise |
Technovelgy.com - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.