10.1594/PANGAEA.706922
Ozima, Minoru
Minoru
Ozima
Takigami, Yutaka
Yutaka
Takigami
Step-heating degassing data for argon-39 from volcanic rocks drilled in the Shikoku Basin and Mariana trench, DSDP Legs 58 and 60
PANGAEA
1980
Drilling/drill rig
Leg58
Leg60
Glomar Challenger
Deep Sea Drilling Project (DSDP)
1977-12-28T00:00:00/1978-04-18T00:00:00
en
Supplementary Publication Series of Datasets
10.1016/0016-7037(80)90185-4
3 datasets
application/zip
Creative Commons Attribution 3.0 Unported
From the experimental data on stepwise thermal release of neutron induced 39Ar (39K (n, p) 39Ar) from rocks and minerals, Arrhenius plots were constructed, which gave activation energies for the thermal release process. The activation energies for DSDP Leg 58 and Leg 60 submarine volcanic rocks range from 12 to 20 kcal/mol, whereas those for granodiorites and the K-feldspar separates have activation energies ranging from 37 to 48 kcal/mol. The smaller activation energies for the submarine volcanic rocks reflect the grain boundary diffusion process, while the thermal diffusion of 39Ar from granodiorites and K-feldspar is essentially controlled by a volume diffusion. The grain boundary diffusion for the submarine volcanic rocks suggests that K resides essentially in the grain boundaries.
Supplement to: Ozima, Minoru; Takigami, Yutaka (1980): Activation energy for thermal release of Ar from some DSDP submarine rocks. Geochimica et Cosmochimica Acta, 44(1), 141-144
132.7748
146.9343
17.8642
29.3275
North Pacific/BASIN
North Pacific/Philippine Sea/BASIN
North Pacific/TRENCH