期刊
ORIGINS OF LIFE AND EVOLUTION OF BIOSPHERES
卷 31, 期 1-2, 页码 3-13出版社
SPRINGER
DOI: 10.1023/A:1006664230212
关键词
continental crust; ionization; radioactivity; radon; voids
类别
Radioactivity in the continental crust (due mainly to the isotopes (238)U, (235)U, (232)Th and (40)K), as a energy source for chemical evolution in the early Archean (between 3.5 and approximate to4 Ga bp), is reviewed. The most important radioactive source in the continental crust is due to the production and accumulation of radioactive gases within the crust voids (porosity). The study of such mechanism has allowed us to reach a deeper understanding about the nature of the radioactive source and to describe its behavior, particularly with regard to prebiotic chemical evolution. An effective total energy of 3 x 10(18) Ja(-1) has been obtained for a depth of 1 km, 4 Ga ago. If a depth of 30 km is taken, the obtained value is almost equal to the UV solar energy radiation (lambda <150 nm). Within the voids the radioactive source of the continental crust played a relevant role in prebiotic synthesis. In uranium deposits of the same age, the role of radiactivity must have been even more relevant in favoring chemical evolution.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据