Mathematics – Logic
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..149m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 1, pp.149-156
Mathematics
Logic
4
Scientific paper
Ages of two Mn encrustations estimated by their 230 Th and 10 Be distributions are compared with K-Ar ages and micropaleontological datings of their nuclei to discuss possible diffusion and supply effects of the radioisotope distribution and their influence on the reliability of age determinations. Based on comparable results obtained by the different methods the effective diffusion coefficient of 10 Be can be calculated as D * 1.0·10 -8 cm 2 /y. This coefficient is 3-8 times smaller than the best estimates available at present. In both nodules we observe lower 10 Be concentrations in the uppermost 2-3 mm (1.3 m.y.), which suggests that 10 Be uptake has been reduced since the middle Pleistocene. The 2.7-fold increase of the growth rate starting 3.2 m.y. ago coincides with the initiation of the northern hemisphere glaciation.
Bonani George
Hofmann Hansjakob J.
Kudrass H.
Mangini Augusto
Morenzoni Elvezio
No associations
LandOfFree
Diffusion and supply rates of 10 Be and 230 Th radioisotopes in two manganese encrustations from the South China Sea does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Diffusion and supply rates of 10 Be and 230 Th radioisotopes in two manganese encrustations from the South China Sea, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diffusion and supply rates of 10 Be and 230 Th radioisotopes in two manganese encrustations from the South China Sea will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1845807