Journal
ESTUARINE COASTAL AND SHELF SCIENCE
Volume 82, Issue 3, Pages 525-536Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2009.02.019
Keywords
Pb-210 geochrology; Cs-137; sedimentation and accumulation rates; Gulf of Tehuantepec; sediments; industrial activities and demographic expansion
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Funding
- CONACyT [45841-F]
- Fonds Quebecois de Recherche Sur la Nature et les Technologies
- DGEP-UNAM
- GEOTOP-UQAM
- UNAM-CIC International Academic Exchange Program
- Mexico-Quebec 2007-2009 (Ministere des Relations Internationales du Quebec-SRE Mexico-CONACyT)
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Short-lived radionuclides (Pb-210 and Cs-137) Were used to document sedimentation regime changes over the last similar to 100 years, from analysis of a single sedimentary sequence collected in the coastal zone of the Gulf of Tehuantepec, South Pacific of Mexico. Sedimentation rates found in the core Tehua II-21 varied from 0.03 to 0.21 cm yr(-1), whereas mass accumulation rates ranged from 0.05 to 0.29 g cm(-2) yr(-1). Cs-137 data validate results obtained from Pb-210 measurements and confirm significant changes in the sedimentation regime between 1950 and 1970. We associate these alterations to land use changes, including deforestation for agriculture development and industrialization, as well as the regimentation of the Tehuantepec River from the early 1960s to the late 1970s. This interval has been marked by a major demographic expansion that followed the industrial development of the area. (C) 2009 Elsevier Ltd. All rights reserved.
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