In this section
@article{Gourbet:2012:10.1016/j.gca.2012.03.002,
author = {Gourbet, L and Shuster, DL and Balco, G and Cassata, WS and Renne, PR and Rood, D},
doi = {10.1016/j.gca.2012.03.002},
journal = {Geochimica Et Cosmochimica Acta},
pages = {21--36},
title = {Neon diffusion kinetics in olivine, pyroxene and feldspar: Retentivity of cosmogenic and nucleogenic neon},
url = {http://dx.doi.org/10.1016/j.gca.2012.03.002},
volume = {86},
year = {2012}
}
TY - JOUR
AB - We performed stepwise degassing experiments by heating single crystals of neutron- or proton-irradiated olivine, pyroxene and feldspar to study diffusion kinetics of neon. This is important in evaluating the utility of these minerals for cosmogenic <sup>21</sup>Ne measurements and, potentially, for Ne thermochronometry. Degassing patterns are only partially explained by simple Arrhenius relationships; most samples do not exhibit a precisely-determined activation energy in an individual diffusion domain. Regardless, we find clear differences in diffusion kinetics among these minerals. Based on sub-selected data, our estimates for neon diffusion kinetics (activation energy E <inf>a</inf> and pre-exponential factor D <inf>o</inf>, assuming the analyzed fragments approximate the diffusion domain) in each mineral are as follows: for the feldspars, E <inf>a</inf> ranges from ~65 to 115kJ/mol and D <inf>o</inf> from 3.9×10 <sup>-3</sup> to 7.1×10 <sup>2</sup>cm <sup>2</sup>s <sup>-1</sup>; for the pyroxenes, E <inf>a</inf> ranges from ~292 to 480kJ/mol and D <inf>o</inf> from 1.6×10 <sup>2</sup> to 2.9×10 <sup>11</sup>cm <sup>2</sup>s <sup>-1</sup>; for the olivines, E <inf>a</inf> ranges from ~360 to 370kJ/mol and D <inf>o</inf> from 1.5×10 <sup>6</sup> to 5.0×10 <sup>6</sup>cm <sup>2</sup>s <sup>-1</sup>. Differences in these parameters are broadly consistent with the expected effect of structural differences between feldspar, and olivine and pyroxene. These results indicate that cosmogenic <sup>21</sup>Ne will be quantitatively retained within olivine and pyroxene at Earth surface temperatures over geological timescales. The diffusion kinetics for feldspars, on the other hand
AU - Gourbet,L
AU - Shuster,DL
AU - Balco,G
AU - Cassata,WS
AU - Renne,PR
AU - Rood,D
DO - 10.1016/j.gca.2012.03.002
EP - 36
PY - 2012///
SN - 0016-7037
SP - 21
TI - Neon diffusion kinetics in olivine, pyroxene and feldspar: Retentivity of cosmogenic and nucleogenic neon
T2 - Geochimica Et Cosmochimica Acta
UR - http://dx.doi.org/10.1016/j.gca.2012.03.002
VL - 86
ER -