210Pb in a tropical coastal lagoon sediment core |
| |
| Authors: | F Páez-Osuna Enrique F Mandelli |
| |
| Institution: | Instituto de Ciencias del Mar y Limnología, UNAM, Apdo. Postal 811, Mazatlán 82000, Sinaloa, México. |
| |
| Abstract: | Excess 210Pb in a core from a Mexican Coastal Lagoon, which has no connection with the sea shows a small but measurable decay over the length of the core, when different approaches were compared (excess and corrected 210Pb activity with depth, total and inorganic cumulative weights) significant differences in the values for the sedimentation rate are obtained. The best coefficient correlation was calculated when corrected 210Pb activity for the uneven distribution of organic matter and cumulative inorganic weight is considered (, R = ?0·86; ω = 0·51 cm yr?1 for the top 13 cm, R = ?0·90 and 1·52 cm yr?1 for the interval 14–46 with R = ?0·96).Time frames in the sedimentary column were in agreement between the 210Pb calculated time and the appearance of shells fragments probably associated with the disturbances caused by the 1961 hurricane Tara.The surface accumulation rate is equivalent to a mean deposition of 262·5 g m?2 yr?1 or organic matter which is minor but comparable to some salt marshes of United States. |
| |
| Keywords: | lead cumulative weight sedimentation rates X-radiography coastal lagoons |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
