Protactinium and thorium isotopes in metal-containing precipitates from Bauer depression

The results studying vertical distribution of 238U, 234U, 232Th, 230Th and 231Pa isotopes in the colomn of metalliferous sediments from Bauer depression (South-East part of the Pacific ocean) are presented. On the basis of the data obtained the supposition about the authigenic origin of 230Th and 231Pa in these ocean sedimentations, is stated, i.e. even in such specific ocean sediments closeness of physical chemical behaviour of 230Th and 231Pa is fixed. Arguments for identical behaviour of these radionuclides in sea water are presented. Average rate of sedimentation of the column investigated of metalliferous sediments from Bauer depression is calculated using the ionic method of ocean deposition dating