The importance of radiocarbon dates and tephra for developing chronologies of Holocene environmental changes from lake sediments, North Far East
- Authors: Lozhkin A.V.1, Brown T.A.2, Anderson P.M.3, Glushkova O.Y.1, Melekestsev I.V.4
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Affiliations:
- Northeast Interdisciplinary Science Research Institute
- Center for Accelerator Mass Spectrometry
- Earth and Space Sciences and Quaternary Research Center
- Institute of Volcanology and Seismology
- Issue: Vol 10, No 4 (2016)
- Pages: 249-262
- Section: Article
- URL: https://journals.rcsi.science/1819-7140/article/view/211101
- DOI: https://doi.org/10.1134/S1819714016040047
- ID: 211101
Cite item
Abstract
Developing continuous chronologies of paleoenvironmental change in northern areas of the Far East using 14C can be problematic because of the low organic content in lake sediments. However, Holocene age-models can be supplemented by widespread tephra deposits reported in the Magadan region. The best documented of these tephras has been correlated to the KO tephra from southern Kamchatka dated to 7600 BP. Although a key chronostratigraphic marker, no detailed compendium of the distribution of this tephra and its associated 14C dates has been available from sites in the northern Far East. We provide such a summary. Known locally as the Elikchan tephra, lake cores indicate an ash fall that extended ~1800 km north of the Kamchatkan caldera with a ~500 km wide trajectory in the Magadan region. Other Holocene tephras preserved in lake sediments have poorer age control and possibly date to ~2500 BP, ~2700 BP and ~6000 BP. These ashes seem to be restricted to coastal or near-coastal sites. A single record of a ~25,000 BP tephra has also been documented ~100 km to the northeast of Magadan.
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About the authors
A. V. Lozhkin
Northeast Interdisciplinary Science Research Institute
Author for correspondence.
Email: lozhkin@neisri.ru
Russian Federation, Magadan, 685000
T. A. Brown
Center for Accelerator Mass Spectrometry
Email: lozhkin@neisri.ru
United States, Livermore, CA, 94551
P. M. Anderson
Earth and Space Sciences and Quaternary Research Center
Email: lozhkin@neisri.ru
United States, Seattle, WA, 98195
O. Yu. Glushkova
Northeast Interdisciplinary Science Research Institute
Email: lozhkin@neisri.ru
Russian Federation, Magadan, 685000
I. V. Melekestsev
Institute of Volcanology and Seismology
Email: lozhkin@neisri.ru
Russian Federation, Petropavlovsk-Kamchatsky, 683006