Changes of coastal sedimentation in the Gulf of Tehuantepec, South Pacific Mexico, over the last 100 years from short-lived radionuclide measurements

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• 作者：A.C. Ruiz-Ferná ; ndez ; C. Hillaire-Marcel ; A. de Vernal ; M.L. Machain-Castillo ; L. Vá ; squez ; B. Ghaleb ; J.A. Aspiazu-Fabiá ; n ; F. Pá ; ez-Osuna
• 关键词：²¹⁰Pb geochrology ; ¹³⁷Cs ; sedimentation and accumulation rates ; Gulf of Tehuantepec ; sediments ; industrial activities and demographic expansion
• 刊名：Estuarine, Coastal and Shelf Science
• 出版年：2009
• 出版时间：30 April 2009
• 年：2009
• 卷：82
• 期：3
• 页码：525-536
• 全文大小：481 K

文摘

Short-lived radionuclides (²¹⁰Pb and ¹³⁷Cs) were used to document sedimentation regime changes over the last 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. ¹³⁷Cs data validate results obtained from ²¹⁰Pb 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.