Navigation Links
Extraterrestrial platinum was 'stirred' into the Earth

A research program aimed at using platinum as an exploration guide for nickel has for the first time been able to put a time scale on the planet's large-scale convection processes.

The research is reported in a Nature paper titled "Progressive mixing of meteoritic veneer into the early Earth's deep mantle".

Report author CSIRO Minerals Down Under Flagship researcher Dr Stephen Barnes said the study group collected a large body of data on the platinum content of lava flows called komatiites, which host some of the world's major nickel deposits.

"We found that the oldest komatiites have the lowest platinum content," Dr Barnes said.

"The platinum content gradually increases from about 3.5 billion years to 2.9 billion years ago. "This tells us that the deep source where the komatiite came from, down near the boundary between the Earth's core and mantle, was gradually gaining platinum over time".

The paper's authors now think they know why.

"When the Earth's core formed, it took all the available platinum with it, leaving the mantle and crust with none," Dr Barnes said.

"Following that, a steady rain of meteorites created the so-called Late Veneer a thin surface layer of meteorite debris rich in platinum."

With time through large-scale convection processes, which now cause plate tectonics, this material was stirred down into the interior of the Earth.

We are seeing the signal of that stirring, which took about 1.5 billion years to occur.

This is the first time a time scale has been put on the stirring, which has important implications for the people who study the dynamics of mantle processes and the mechanisms that cause plate tectonics, earthquakes and volcanoes.

Combined with some other work by the researchers on sister elements to platinum, iridium and osmium, we also now have a new framework for understanding the variations in isotopic ratios of osmium with time.

Osmium isotopes are widely used as tracers of mantle processes, but there has been a mismatch between signals from osmium and from other important isotopic tracer systems which has eluded explanation until now.

Co-authors Dr Marco Fiorentini and Dr Wolfgang Maier from the University of Western Australia are delighted that this is a completely academic outcome which came out of an industry-funded project.

"It is a nice example of an unexpected fundamental discovery arising from a practical applied science study and demonstrates the very positive collaborations that exist between CSIRO and the University of Western Australia," Dr Fiorentini said.


Contact: Bob Chamberlain
CSIRO Australia

Related biology news :

1. Research team says extraterrestrial impact to blame for Ice Age extinctions
2. A tiny frozen microbe may hold clues to extraterrestrial life
3. Platinum Solutions, Inc. Teams with Lockheed Martin on Federal Bureau of Investigations Next Generation Identification Program
4. Global Warming and the Habitability of Planet Earth, Sept. 26
5. Good earth: Brown chemists show origin of soil-scented geosmin
6. Scientists launch deep-sea scientific drilling program to study volatile earthquake zone
7. Biogeochemistry -- A window into the Earths ecological health
8. How did chemical constituents essential to life arise on primitive Earth?
9. Scientists warn that species extinction could reduce productivity of plants on Earth by half
10. Earth Observation essential for geohazard mitigation
11. Liquid crystal phases of tiny DNA molecules point up new scenario for first life on Earth
Post Your Comments:
Related Image:
Extraterrestrial platinum was 'stirred' into the Earth
(Date:11/9/2015)... 2015 ... "Global Law Enforcement Biometrics Market 2015-2019" ... ) has announced the addition ... Market 2015-2019" report to their offering. ... ) has announced the addition of ...
(Date:11/2/2015)... Calif. , Nov. 2, 2015  SRI International ... million to provide preclinical development services to the National ... contract, SRI will provide scientific expertise, modern testing and ... variety of preclinical pharmacology and toxicology studies to evaluate ... --> The PREVENT Cancer Drug Development Program ...
(Date:10/29/2015)... 2015 Daon, a global leader in mobile ... a new version of its IdentityX Platform , ... America have already installed IdentityX v4.0 and ... FIDO UAF certified server component as an ... FIDO features. These customers include some of the largest ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... , November 25, 2015 ... Report is a professional and in-depth study on ...      (Logo: ) , ... the industry including definitions, classifications, applications and industry ... for the international markets including development trends, competitive ...
(Date:11/24/2015)... , Nov. 24, 2015 Halozyme Therapeutics, Inc. (NASDAQ: ... in New York on Wednesday, December 2 ... Torley , president and CEO, will provide a corporate overview. ... York at 1:00 p.m. ET/10:00 a.m. PT . ... relations, will provide a corporate overview. --> th ...
(Date:11/24/2015)... -- Clintrax Global, Inc., a worldwide provider of clinical research services headquartered ... the company has set a new quarterly earnings record in Q3 ... posted for Q3 of 2014 to Q3 of 2015.   ... , with the establishment of an Asia-Pacific ... United Kingdom and Mexico , with ...
(Date:11/24/2015)... 2015 --> ... released by Transparency Market Research, the global non-invasive prenatal ... of 17.5% during the period between 2014 and 2022. ... Industry Analysis, Size, Volume, Share, Growth, Trends and Forecast ... market to reach a valuation of US$2.38 bn by ...
Breaking Biology Technology: