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Sediment Organic Carbon in Todos Santos Bay, Baja California, Mexico |
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| Authors: | Stephen V Smith Silvia E Ibarra-Obando Victoria Díaz-Castañeda Francisco Javier Aranda-Manteca José D Carriquiry Brian N Popp Oscar Gonzalez-Yajimovich |
| Institution: | 1. Centro de Investigación Científica y Educación Superior de Ensenada (CICESE), Km. 107 carretera Tijuana-Ensenada, Ensenada, 22830, Baja California, México 2. Facultad de Ciencias Marinas, Universidad Autónoma de Baja California, Km. 103 carretera Tijuana-Ensenada, Ensenada, 22860, Baja California, México 3. Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Km. 103 carretera Tijuana-Ensenada, Ensenada, 22860, Baja California, México 4. Department of Geology & Geophysics, University of Hawaii, Honolulu, HI, 96822, USA |
| Abstract: | Sediment grain size and organic carbon (OC) data collected over the past 50 years, together with δ13C values of OC in recently collected samples, were analyzed to improve understanding of sediment OC distribution and abundance in Todos Santos Bay. Sediments in the submarine canyon at the mouth of the bay and in quiet-water locations along the shore are fine grained, high in OC, and have generally low δ13C values; sediments in high-energy environments are low in OC and have high δ13C values. A bivariate isotopic mixing model indicates that none of the sediments contain >50% terrigenous OC (average ~30%), and that the terrigenous OC content of the sediments is a small proportion of the OC content of local soils. Sediment OC composition is apparently controlled by energy-related sorting and deposition, oxidation of much of the original terrigenous OC, and replacement of some terrigenous OC by marine OC. |
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