Marine radiocarbon reservoir effect along the northern Chile-southern Peru coast (14-24°S) throughout the Holocene |
| |
| Authors: | Luc Ortlieb Gabriel Vargas |
| |
| Institution: | a PALEOTROPIQUE, Institut de Recherche pour le Développement, 32 Avenue Henri Varagnat, 93143 Bondy Cedex, Franceb Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chilec LOCEAN, UMR 7159 (Université Pierre & Marie Curie, CNRS, IRD, MNHN), 4 place Jussieu, 75230 Paris Cedex 05, France |
| |
| Abstract: | Through an extensive sampling and dating of pairs of associated shells and charcoal fragments combined with reanalysis of all the available previous data, we reconstruct the evolution throughout the Holocene of the regional marine radiocarbon reservoir effect (ΔR) values along the northern Chile-southern Peru area (14°-24°S). After elimination of the cases in which the terrestrial component yielded older ages than the marine shells to which they were associated, the study is based upon data from 47 pairs of associated marine and terrestrial material.Our results suggest major changes in both the magnitude and variability range of ΔR during the whole Holocene Period: (1) between 10,400 and 6840 cal yr BP, high values (511 ± 278 yr) probably result from a strengthened SE Pacific subtropical anticyclone and shoaling of equatorial subsurface waters during intensified upwelling events; (2) between 5180 and 1160 cal yr BP, lower values (226 ± 98 yr) may reflect a major influence of subtropical water and diminished coastal upwelling processes; (3) during the last ~ thousand years, high values (between 355 ± 105 and 253 ± 207 yr) indicate an increased influence of 14C-depleted water masses and of ENSO. For the early twentieth century a ΔR value of 253 ± 207 yr was calculated. |
| |
| Keywords: | Radiocarbon reservoir effect Holocene Paleoceanographic circulation Upwelling Southeastern Pacific Peru Chile |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
