Navigation Links
Oldest Earth mantle reservoir discovered
Date:8/11/2010

Researchers have found a primitive Earth mantle reservoir on Baffin Island in the Canadian Arctic. Geologist Matthew Jackson and his colleagues from a multi-institution collaboration report the finding--the first discovery of what may be a primitive Earth mantle--this week in the journal Nature.

The Earth's mantle is a rocky, solid shell that is between the Earth's crust and the outer core, and makes up about 84 percent of the Earth's volume. The mantle is made up of many distinct portions or reservoirs that have different chemical compositions.

Scientists had previously concluded that the Earth was slightly older than 4.5 billion years old, but had not found a piece of the Earth's primitive mantle.

Until recently, researchers generally thought that the Earth and the other planets of the solar system were chondritic, meaning that the mantle's chemistry was thought to be similar to that of chondrites--some of the oldest, most primitive objects in the solar system. Assuming a chondritic model of the Earth, a piece of the primitive mantle would have certain isotope ratios of the chemical elements of helium, lead and neodymium.

The model that the Earth was chondritic was called into question with a discovery five years ago by a team at the Carnegie Institution of Washington, which suggested the ratio of neodymium on Earth was higher than what would be expected if the Earth were indeed chondritic.

That finding changed the neodymium ratio expected in the primitive mantle and in turn, changed where researchers should be looking to find evidence of a primitive mantle. According to the lead author, Matthew Jackson, "We had been looking under the wrong rock."

Since many of the ancient rocks have melted over time, finding a piece of the primitive mantle means studying lavas. Lavas retain the same isotopic composition of the rocks that have melted into the lava. Therefore, testing the lava's composition is id
'/>"/>

Contact: Kimberly J. Montgomery
kmontgom@nsf.gov
703-292-8463
National Science Foundation
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Dinosaur-chewing mammals leave behind oldest known tooth marks
2. Ardi displaces Lucy as oldest hominid skeleton
3. Kent State University Professor C. Owen Lovejoy helps unveil oldest hominid skeleton
4. 4,000-year-old coral beds among worlds oldest living things, prof says
5. Researchers uncover worlds oldest fossil impression of a flying insect
6. Breath of the Earth: Cycling carbon through terrestrial ecosystems
7. New book provides summary of research into the origins of life on Earth
8. LSU professor uses volcanic emissions to study Earths atmospheric past
9. Earth microbes may contaminate the search for life on Mars
10. Expert commentary on Earth Days 40th anniversary
11. Touch the Earth to display at Earth Day on National Mall
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Oldest Earth mantle reservoir discovered
(Date:7/10/2014)... ALBANY, New York , July 7, 2014 /PRNewswire/ ... published by Transparency Market Research "Electronic Access Control Systems ... Analysis, 2014 - 2019," the global Electronic Access Control ... 2013 and is expected to grow at a CAGR ... estimated value of USD 31,187.8 million in 2019. ...
(Date:7/10/2014)... -- Acuity Market Intelligence today released forecasts from "The Global ... global market for National Electronic ID (eID) programs will generate ... time, the number of National eID cards in circulation will ... , with its vast population, will dominate the market ... Europe trails a distant second at ...
(Date:7/10/2014)... genus Axinaea belongs to the large, mainly tropical ... ca. 5000 species in the family rely on bees for ... by other insects or vertebrates. The flowers of Axinaea ... flowers and the petals of the different species are pink, ... out based on the contrasting colours of their bulbous appendages. ...
Breaking Biology News(10 mins):Electronic Access Control Systems Market is Expected to Reach USD 31.2 Billion Globally in 2019: Transparency Market Research 2Electronic Access Control Systems Market is Expected to Reach USD 31.2 Billion Globally in 2019: Transparency Market Research 3Electronic Access Control Systems Market is Expected to Reach USD 31.2 Billion Globally in 2019: Transparency Market Research 4Electronic Access Control Systems Market is Expected to Reach USD 31.2 Billion Globally in 2019: Transparency Market Research 5National Electronic ID Programs Generate $54 Billion Between 2013 and 2018 with 3.5 Billion National eID Card Holders Worldwide 2Novel type of bird pollination mechanism discovered in South America 2
... Autism Speaks, the world,s largest autism science and ... research grants totaling $2,309,233 in funding over the next ... inaugurates its Bob and Suzanne Wright Trailblazer Awards which ... The three Trailblazer Awards this year fund small investigator-initiated ...
... Midwestern farm fields may be doing more than churning out ... also help corn and soybean crops stay cooler and dryer, ... to extract growth-enhancing carbon dioxide [CO2] from the air and ... Geophysical Union, a scientific society, in San Francisco today, a ...
... driven evolutionary snapshot of woody plants in four similar ... perspective on genetic diversity and threats posed by both ... the study, appearing online ahead of publication in ... that evolutionary diversity -- the millions of years of ...
Cached Biology News:Autism Speaks awards 21 new research grants funding 2Autism Speaks awards 21 new research grants funding 3Autism Speaks awards 21 new research grants funding 4Autism Speaks awards 21 new research grants funding 5Autism Speaks awards 21 new research grants funding 6Wind turbines may benefit crops 2Wind turbines may benefit crops 3Extinctions, loss of habitat harm evolutionary diversity 2Extinctions, loss of habitat harm evolutionary diversity 3
(Date:7/11/2014)... July 11, 2014 Research and Markets ... Technology Market - Global Industry Analysis, Size, Share, Growth, ... offering. http://photos.prnewswire.com/prnh/20130307/600769 ... acids (either DNA or RNA) into cells. This technology ... cancer cells and protein metabolism by affecting the nuclear ...
(Date:7/11/2014)... July 11, 2014 EPFL and ... the appointment of John P. Donoghue . The ... Geneva . The new Wyss ... in Geneva , has named as ... John P. Donoghue , founder of Brown University,s ...
(Date:7/11/2014)... 11, 2014  Researchers have pioneered a revolutionary ... new technology, called Virtual Finger, allows scientists to ... neurons and synapses using the flat surface of ... 3D imaging studies orders of magnitude more efficient, ... level across many areas of experimental biology. The ...
(Date:7/10/2014)... (PRWEB) July 10, 2014 Women ... have access to an additional family planning option. ... to contraception at all levels of the health ... formulation of a widely used contraceptive—Pfizer’s Depo-Provera® (depot ... Burkina Faso is the first of four African ...
Breaking Biology Technology:International Transfection Technology Market - Industry Analysis, Size, Share, Growth, Trends and Forecast to 2019 2John P. Donoghue is Taking the Lead at the Wyss Center and is Appointed Professor at EPFL and University of Geneva 2John P. Donoghue is Taking the Lead at the Wyss Center and is Appointed Professor at EPFL and University of Geneva 3Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 2Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 3Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 2Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 3Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 4Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 5Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 6
... Life Sciences,Holdings, Inc. (Nasdaq: ADLS ), a ... of novel drugs in the,therapeutic areas of infection, ... for the third quarter ended September 30,2007. ... for the three months ended September 30, 2007 ...
... MS, EDMONTON, Nov. 14 /PRNewswire-FirstCall/ - BioMS ... treatment of multiple sclerosis (MS), today,announced financial and ... 2007. "During the quarter, we continued to ... MBP8298, for the treatment of multiple,sclerosis," said Kevin ...
... Micromet, Inc.,(Nasdaq: MITI ) ("Micromet" or ... for the treatment of cancer,inflammation and autoimmune diseases, ... Company appointed Joseph P. Slattery as a member ... committee. The appointment will be,effective as of November ...
Cached Biology Technology:Advanced Life Sciences Announces Third Quarter 2007 Financial Results 2Advanced Life Sciences Announces Third Quarter 2007 Financial Results 3Advanced Life Sciences Announces Third Quarter 2007 Financial Results 4Advanced Life Sciences Announces Third Quarter 2007 Financial Results 5Advanced Life Sciences Announces Third Quarter 2007 Financial Results 6Advanced Life Sciences Announces Third Quarter 2007 Financial Results 7Advanced Life Sciences Announces Third Quarter 2007 Financial Results 8Advanced Life Sciences Announces Third Quarter 2007 Financial Results 9BioMS Medical announces third quarter 2007 results 2BioMS Medical announces third quarter 2007 results 3BioMS Medical announces third quarter 2007 results 4Micromet, Inc. Elects Joseph P. Slattery to Board of Directors 2Micromet, Inc. Elects Joseph P. Slattery to Board of Directors 3Micromet, Inc. Elects Joseph P. Slattery to Board of Directors 4