* Astronomy

Members Login
Username 
 
Password 
    Remember Me  
Home -> Astronomy News -> Earth -> Earth's carbon
Post Info TOPIC: Earth's carbon
Blobrana


L

Posts: 131433
Date:
RE: Earth's carbon
Permalink  
 

Researchers from USC and Nanjing University in China have documented evidence suggesting that part of the reason that the Earth has become neither sweltering like Venus nor frigid like Mars lies with a built-in atmospheric carbon dioxide regulator - the geologic cycles that churn up the planet's rocky surface.
Scientists have long known that "fresh" rock pushed to the surface via mountain formation effectively acts as a kind of sponge, soaking up the greenhouse gas CO2. Left unchecked, however, that process would deplete atmospheric CO2 levels to a point that would plunge the Earth into an eternal winter within a few million years during the formation of large mountain ranges like the Himalayas - which has clearly not happened.
Read more



__________________
Blobrana


L

Posts: 131433
Date:
Mantle Carbon
Permalink  
 

Diamonds and the Geology of Mantle Carbon

Read more (PDF)



__________________
Blobrana


L

Posts: 131433
Date:
Earth's carbon
Permalink  
 

Title: Primordial origins of Earth's carbon
Authors: Bernard Marty, Conel M. O'D. Alexander, Sean N. Raymond

In this chapter we review the astrophysical origins of Earth's carbon, starting from the products of the Big Bang and culminating with the Earth's formation. We review the measured compositions of different primitive objects including comets, various classes of meteorites and interstellar dust particles. We discuss the composition of the Solar Nebula, especially with regards to the distribution of volatiles such as carbon. We discuss dynamical models of planetary formation from planetesimals and planetary embryos, and the timescale for volatile delivery to the growing Earth from different sources. Finally, we review Earth's carbon reservoirs. Throughout the chapter we highlight open questions related to planet formation, meteoritics, and geochemistry.

Read more (117kb, PDF)



__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
Home -> Astronomy News -> Earth -> Earth's carbon


Create your own FREE Forum
Report Abuse 		Powered by ActiveBoard