mass containing the dissolved nuclides from the east (16). At the ocean margin off Baja California the horizontal transport of Th-230 and Pa-231 along isopycnals (2,6) supplies the excess Th-230 and Pa-231 which is also removed with little fractionation by Mn cycling and by the high alumino-silicate flux. We would like to thank the Captain and crew of the R/V Thomas G. Thomson for their efforts, and Dr J.W. Murray for allowing us to participate on his cruises. Analytical expertise and stamina was provided by Frances Lindsay and Mike Saunders. GBS acknowledges NERC support on grant GR3/6175. Its 1. Anderson, R.F., Bacon, M.P. and Brewer, P.G., Removal of Th-230 and Pa-231 from the open ocean. Earth Planet. Sci. Lett., 1983a, 62. 7-23. 2. Anderson, R.F., Bacon, M.P. and Brewer, P.G., Removal of Th-230 and Pa-231 at ocean margins. Earth Planet. Sci. Lett., 1983b, 66. 73-90. 3. Shimmield, G.B., Murray, J.W., Thomson, J., Bacon, M.P., Anderson, R.F. and Price, N.B., The distribution and behaviour of Th-230 and Pa-231 at an ocean margin, Baja California, Mexico. Geochim. Cosmochim. Acta, 1986, 50. 2499-2507. 4. Yang, H-S., Nozaki, Y., Sakai, H. and Masuda, A., The distribution of Th-230 and Pa-231 in the deep-sea surface sediments of the Pacific Ocean. Geochim. Cosmochim. Acta, 1986, 50. 81-89. 5. Nozaki, Y., Horibe, Y. and Tsubota, H., The water column distributions of thorium isotopes in the western North Pacific. Earth Planet. Sci. Lett., 1981, 54. 203-216. 6. Nozaki, Y. and Nakanishi, T., Pa-231 and Th-230 profiles in the open ocean water column. Deep-Sea Res., 1985, 32. 1209-1220. 7. Kadko, D., A detailed study of some uranium series nuclides at an abyssal hill area near the East Pacific Rise at 8 °45'N. Earth Planet. Sci. Lett., 1980, 51. 115-131. 8. Mangini, A. and Sonntag, C., Pa-231 dating of deep-sea cores via Th-227 counting. Earth Planet. Sci. Lett., 1977, 37. 251-256. 9. Lyle, M.W. and Dymond J., Metal accumulation rates in the southeast Pacific - errors introduced from assumed bulk densities. Earth Planet. Sci. Lett., 1976, 30. 164-168. 10. V eeh, H., Depostion of uranium from the ocean. Earth Planet. Sci. Lett., 1967, 3. 145-150.

doi:10.1201/9781482286489-39

Chapter

$mass containing the dissolved nuclides from the east (16). At the ocean margin off Baja California the horizontal transport of Th-230 and Pa-231 along isopycnals (2,6) supplies the excess Th-230 and Pa-231 which is also removed with little fractionation by Mn cycling and by the high alumino-silicate flux. We would like to thank the Captain and crew of the R/V Thomas G. Thomson for their efforts, and Dr J.W. Murray for allowing us to participate on his cruises. Analytical expertise and stamina was provided by Frances Lindsay and Mike Saunders. GBS acknowledges NERC support on grant GR3/6175. Its 1. Anderson, R.F., Bacon, M.P. and Brewer, P.G., Removal of Th-230 and Pa-231 from the open ocean. Earth Planet. Sci. Lett., 1983a, 62. 7-23. 2. Anderson, R.F., Bacon, M.P. and Brewer, P.G., Removal of Th-230 and Pa-231 at ocean margins. Earth Planet. Sci. Lett., 1983b, 66. 73-90. 3. Shimmield, G.B., Murray, J.W., Thomson, J., Bacon, M.P., Anderson, R.F. and Price, N.B., The distribution and behaviour of Th-230 and Pa-231 at an ocean margin, Baja California, Mexico. Geochim. Cosmochim. Acta, 1986, 50. 2499-2507. 4. Yang, H-S., Nozaki, Y., Sakai, H. and Masuda, A., The distribution of Th-230 and Pa-231 in the deep-sea surface sediments of the Pacific Ocean. Geochim. Cosmochim. Acta, 1986, 50. 81-89. 5. Nozaki, Y., Horibe, Y. and Tsubota, H., The water column distributions of thorium isotopes in the western North Pacific. Earth Planet. Sci. Lett., 1981, 54. 203-216. 6. Nozaki, Y. and Nakanishi, T., Pa-231 and Th-230 profiles in the open ocean water column. Deep-Sea Res., 1985, 32. 1209-1220. 7. Kadko, D., A detailed study of some uranium series nuclides at an abyssal hill area near the East Pacific Rise at 8 °45'N. Earth Planet. Sci. Lett., 1980, 51. 115-131. 8. Mangini, A. and Sonntag, C., Pa-231 dating of deep-sea cores via Th-227 counting. Earth Planet. Sci. Lett., 1977, 37. 251-256. 9. Lyle, M.W. and Dymond J., Metal accumulation rates in the southeast Pacific - errors introduced from assumed bulk densities. Earth Planet. Sci. Lett., 1976, 30. 164-168. 10. V eeh, H., Depostion of uranium from the ocean. Earth Planet. Sci. Lett., 1967, 3. 145-150.$

Chapter

mass containing the dissolved nuclides from the east (16). At the ocean margin off Baja California the horizontal transport of Th-230 and Pa-231 along isopycnals (2,6) supplies the excess Th-230 and Pa-231 which is also removed with little fractionation by Mn cycling and by the high alumino-silicate flux. We would like to thank the Captain and crew of the R/V Thomas G. Thomson for their efforts, and Dr J.W. Murray for allowing us to participate on his cruises. Analytical expertise and stamina was provided by Frances Lindsay and Mike Saunders. GBS acknowledges NERC support on grant GR3/6175. Its 1. Anderson, R.F., Bacon, M.P. and Brewer, P.G., Removal of Th-230 and Pa-231 from the open ocean. Earth Planet. Sci. Lett., 1983a, 62. 7-23. 2. Anderson, R.F., Bacon, M.P. and Brewer, P.G., Removal of Th-230 and Pa-231 at ocean margins. Earth Planet. Sci. Lett., 1983b, 66. 73-90. 3. Shimmield, G.B., Murray, J.W., Thomson, J., Bacon, M.P., Anderson, R.F. and Price, N.B., The distribution and behaviour of Th-230 and Pa-231 at an ocean margin, Baja California, Mexico. Geochim. Cosmochim. Acta, 1986, 50. 2499-2507. 4. Yang, H-S., Nozaki, Y., Sakai, H. and Masuda, A., The distribution of Th-230 and Pa-231 in the deep-sea surface sediments of the Pacific Ocean. Geochim. Cosmochim. Acta, 1986, 50. 81-89. 5. Nozaki, Y., Horibe, Y. and Tsubota, H., The water column distributions of thorium isotopes in the western North Pacific. Earth Planet. Sci. Lett., 1981, 54. 203-216. 6. Nozaki, Y. and Nakanishi, T., Pa-231 and Th-230 profiles in the open ocean water column. Deep-Sea Res., 1985, 32. 1209-1220. 7. Kadko, D., A detailed study of some uranium series nuclides at an abyssal hill area near the East Pacific Rise at 8 °45'N. Earth Planet. Sci. Lett., 1980, 51. 115-131. 8. Mangini, A. and Sonntag, C., Pa-231 dating of deep-sea cores via Th-227 counting. Earth Planet. Sci. Lett., 1977, 37. 251-256. 9. Lyle, M.W. and Dymond J., Metal accumulation rates in the southeast Pacific - errors introduced from assumed bulk densities. Earth Planet. Sci. Lett., 1976, 30. 164-168. 10. V eeh, H., Depostion of uranium from the ocean. Earth Planet. Sci. Lett., 1967, 3. 145-150.

DOI link for mass containing the dissolved nuclides from the east (16). At the ocean margin off Baja California the horizontal transport of Th-230 and Pa-231 along isopycnals (2,6) supplies the excess Th-230 and Pa-231 which is also removed with little fractionation by Mn cycling and by the high alumino-silicate flux. We would like to thank the Captain and crew of the R/V Thomas G. Thomson for their efforts, and Dr J.W. Murray for allowing us to participate on his cruises. Analytical expertise and stamina was provided by Frances Lindsay and Mike Saunders. GBS acknowledges NERC support on grant GR3/6175. Its 1. Anderson, R.F., Bacon, M.P. and Brewer, P.G., Removal of Th-230 and Pa-231 from the open ocean. Earth Planet. Sci. Lett., 1983a, 62. 7-23. 2. Anderson, R.F., Bacon, M.P. and Brewer, P.G., Removal of Th-230 and Pa-231 at ocean margins. Earth Planet. Sci. Lett., 1983b, 66. 73-90. 3. Shimmield, G.B., Murray, J.W., Thomson, J., Bacon, M.P., Anderson, R.F. and Price, N.B., The distribution and behaviour of Th-230 and Pa-231 at an ocean margin, Baja California, Mexico. Geochim. Cosmochim. Acta, 1986, 50. 2499-2507. 4. Yang, H-S., Nozaki, Y., Sakai, H. and Masuda, A., The distribution of Th-230 and Pa-231 in the deep-sea surface sediments of the Pacific Ocean. Geochim. Cosmochim. Acta, 1986, 50. 81-89. 5. Nozaki, Y., Horibe, Y. and Tsubota, H., The water column distributions of thorium isotopes in the western North Pacific. Earth Planet. Sci. Lett., 1981, 54. 203-216. 6. Nozaki, Y. and Nakanishi, T., Pa-231 and Th-230 profiles in the open ocean water column. Deep-Sea Res., 1985, 32. 1209-1220. 7. Kadko, D., A detailed study of some uranium series nuclides at an abyssal hill area near the East Pacific Rise at 8 °45'N. Earth Planet. Sci. Lett., 1980, 51. 115-131. 8. Mangini, A. and Sonntag, C., Pa-231 dating of deep-sea cores via Th-227 counting. Earth Planet. Sci. Lett., 1977, 37. 251-256. 9. Lyle, M.W. and Dymond J., Metal accumulation rates in the southeast Pacific - errors introduced from assumed bulk densities. Earth Planet. Sci. Lett., 1976, 30. 164-168. 10. V eeh, H., Depostion of uranium from the ocean. Earth Planet. Sci. Lett., 1967, 3. 145-150.

mass containing the dissolved nuclides from the east (16). At the ocean margin off Baja California the horizontal transport of Th-230 and Pa-231 along isopycnals (2,6) supplies the excess Th-230 and Pa-231 which is also removed with little fractionation by Mn cycling and by the high alumino-silicate flux. We would like to thank the Captain and crew of the R/V Thomas G. Thomson for their efforts, and Dr J.W. Murray for allowing us to participate on his cruises. Analytical expertise and stamina was provided by Frances Lindsay and Mike Saunders. GBS acknowledges NERC support on grant GR3/6175. Its 1. Anderson, R.F., Bacon, M.P. and Brewer, P.G., Removal of Th-230 and Pa-231 from the open ocean. Earth Planet. Sci. Lett., 1983a, 62. 7-23. 2. Anderson, R.F., Bacon, M.P. and Brewer, P.G., Removal of Th-230 and Pa-231 at ocean margins. Earth Planet. Sci. Lett., 1983b, 66. 73-90. 3. Shimmield, G.B., Murray, J.W., Thomson, J., Bacon, M.P., Anderson, R.F. and Price, N.B., The distribution and behaviour of Th-230 and Pa-231 at an ocean margin, Baja California, Mexico. Geochim. Cosmochim. Acta, 1986, 50. 2499-2507. 4. Yang, H-S., Nozaki, Y., Sakai, H. and Masuda, A., The distribution of Th-230 and Pa-231 in the deep-sea surface sediments of the Pacific Ocean. Geochim. Cosmochim. Acta, 1986, 50. 81-89. 5. Nozaki, Y., Horibe, Y. and Tsubota, H., The water column distributions of thorium isotopes in the western North Pacific. Earth Planet. Sci. Lett., 1981, 54. 203-216. 6. Nozaki, Y. and Nakanishi, T., Pa-231 and Th-230 profiles in the open ocean water column. Deep-Sea Res., 1985, 32. 1209-1220. 7. Kadko, D., A detailed study of some uranium series nuclides at an abyssal hill area near the East Pacific Rise at 8 °45'N. Earth Planet. Sci. Lett., 1980, 51. 115-131. 8. Mangini, A. and Sonntag, C., Pa-231 dating of deep-sea cores via Th-227 counting. Earth Planet. Sci. Lett., 1977, 37. 251-256. 9. Lyle, M.W. and Dymond J., Metal accumulation rates in the southeast Pacific - errors introduced from assumed bulk densities. Earth Planet. Sci. Lett., 1976, 30. 164-168. 10. V eeh, H., Depostion of uranium from the ocean. Earth Planet. Sci. Lett., 1967, 3. 145-150.

ABSTRACT

ACKNOWLEDGEMENI'S