Centro Interdisciplinario de Ciencias Marinas, Instituto Politécnico Nacional, Avenida de IPN s/n, Col. Playa Palo de Santa Rita, Apdo Postal 592, 23096 Baja California Sur, Mexico.
Arch Environ Contam Toxicol. 2012 Oct;63(3):309-22. doi: 10.1007/s00244-012-9776-1. Epub 2012 Jun 22.
To investigate the causes of uranium (U) enrichment in marine sediments in the eastern sector of the Gulf of California, surface sediments and sediment cores were collected adjacent to the Santa Rosalía copper mining region in the Baja California peninsula. Three coastal sediment cores were found to display high concentrations of U (from 54.2 ± 7.3 mg kg(-1) to 110 ± 13 mg kg(-1)) exceeding those found in the deeper cores (1.36 ± 0.26 mg kg(-1) in the Guaymas Basin to 9.31 ± 3.03 mg kg(-1) in the SR63 core from the suboxic zone). The contribution of non-lithogenic U (estimated using scandium to normalize) to the total U content in sediments of three coastal cores varied from 97.2 ± 0.4 % to 98.82 % versus 49.8 ± 3 % (Guaymas Basin) to 84.2 ± 8.2 % (SR62 core) in the deeper cores. The U content record in a lead-210 ((210)Pb)-dated core had two peaks (in 1923 and 1967) corresponding to the history of ancient mining and smelting activities in Santa Rosalía.
为了探究加利福尼亚湾东部海域海洋沉积物中铀（U）富集的原因，在巴哈加利福尼亚半岛圣罗莎莉亚（Santa Rosalía）铜矿开采区附近采集了表层沉积物和岩芯。发现三个沿海岩芯的 U 浓度很高（从 54.2 ± 7.3 mg kg(-1)到 110 ± 13 mg kg(-1)），超过了深部岩芯的浓度（在古氧带的 Guaymas 盆地为 1.36 ± 0.26 mg kg(-1)，在来自亚缺氧带的 SR63 岩芯中为 9.31 ± 3.03 mg kg(-1)）。三个沿海岩芯中总 U 含量中非生源 U 的贡献（使用钪标准化估算）从 97.2 ± 0.4%到 98.82%不等，而在深部岩芯中则为 49.8 ± 3%（Guaymas 盆地）到 84.2 ± 8.2%（SR62 岩芯）。一个用 210 铅（210Pb）定年的岩芯中的 U 含量记录有两个峰值（分别在 1923 年和 1967 年），与圣罗莎莉亚古老的采矿和冶炼活动历史相对应。
