NDLI: Radiocarbon age inversions and progression: source and causes in Late Holocene sediments from Lake Chapala, western Mexico

Content Provider	Springer Nature Link
Author	Zárate del Valle, Pedro F. Ramírez Sánchez, Hermes U. Fernex, François Simoneit, Bernd R. T. Israde Alcántara, Isabel
Copyright Year	2010
Abstract	The results of eight radiocarbon datings of Lake Chapala sediments (site T46) are presented, the age inversions (AI) observed and their age progression discussed. As deduced from some AIs and the $^{210}$Pb activity (site CHP4), the bioturbation zone in the lake varies over a depth of 5–25 cm. The linear sedimentation rates (LSRs) calculated from $^{14}$C ages do not match the LSR calculated from unsupported $^{210}$Pb activity for the upper sediments. This demonstrates the usefulness of dating sediments with complementary radiometric techniques such as short-lived isotope counting (SLIC), i.e., $^{210}$Pb and $^{137}$Cs. This approach leads to the following conclusions: (1) The incorporation of detrital particles with ancient carbon into the sedimentary column of the lake occurred by a combination of: (a) the presence of outcrops of hydrothermal petroleum with ages >40 ka (ka = thousands of years) in the lake, and (b) mass transport due to the presence of two elongated gyre circulation patterns integrated by cyclonic circulation (counterclockwise) in the north portion of the lake and anticyclonic circulation in the southern part. (2) Consequently, the $^{14}$C ages of shallow lake sediments have geologic ages one order of magnitude greater compared to their ages determined by the $^{210}$Pb method. (3) A bioturbation mechanism is not necessary to explain the $^{14}$C AI in the top 70 cm and from 110 to 150 cm depth of the sediments. (4) According to the biological proxies data for the last 600 years B.P., the paleoclimate at Lake Chapala has changed from sub-humid to dry environmental conditions, and eutrophication has increased over the past 100 years due to local input from ongoing agricultural activities.
Starting Page	1011
Ending Page	1019
Page Count	9
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	63
Issue Number	5
e-ISSN	18666299
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-10-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Radiocarbon age inversion Hydrothermal petroleum CIC model Lake Chapala Geology
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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