This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).

The inert nature of the noble gases makes them ideally suited to trace the evolution of the Earth's atmosphere. In particular, the Iodine-Xenon and Plutonium-Uranium-Xenon radioactive decay systems provide constraints on the timing and rates of degassing from Earth's mantle during the first few hundred million years of earth history. This research involves measuring the abundance of the noble gases and CO2 in a suite of basalt glasses from the ultraslow mid-ocean ridge spreading center, the Southwest Indian Ridge. Isotopic measurements of He, Ne, Ar, Kr, Xe will also be carried out. This research is important for understanding the compositions of the major gases in the early atmosphere. It will also address first order questions relating to the evolution of volatiles in Earth's mantle including how tectonic control, mid ocean ridge spreading rates, and mantle temperature influence planetary degassing. Data from the study will allow evaluation of the volatile budget of the Earth and provide fundamental constraints on the early (first 100 million years) outgassing of the mantle and the origin of the atmosphere. Broader impacts are student training and support of an early career scientist.

Agency
National Science Foundation (NSF)
Institute
Division of Ocean Sciences (OCE)
Type
Standard Grant (Standard)
Application #
0929193
Program Officer
Barbara L. Ransom
Project Start
Project End
Budget Start
2009-08-01
Budget End
2013-06-30
Support Year
Fiscal Year
2009
Total Cost
$369,250
Indirect Cost
Name
Harvard University
Department
Type
DUNS #
City
Cambridge
State
MA
Country
United States
Zip Code
02138