Development of an automated extraction and radiocarbon dating method for fossil pollen deposited in lake Motosu, Japan

[en] Recently, radiocarbon (14C) dating methods using fossil pollen extracted from sediments with a flow cytometer (cell sorter) are under development. Technical limitations experienced by previous studies required extraction of grains <80 μm in diameter. Thus, obtaining a sufficient mass of carbon for dating requires extracting a very large number (~105) of grains. Another challenge faced by earlier work was preventing contamination by exotic carbon during the extraction process. Here we present a novel solution to this problem by using a cell sorter with a newly designed pretreatment method and an improved extraction method. This enables us to extract large pollen fossils than was previously possible. By using grains, >100 μm in diameter, such as Pinus sp., we have reduced the number of grains for required for 14C dating by an order of magnitude, particularly when considering the recent advances in measure ultra-small carbon masses on a single-stage accelerator mass spectrometer at the Atmosphere and Ocean Research Institute, University of Tokyo. We then apply this method to sediments recovered from Lake Motosu, which already has a very robust chronology, to evaluate the new method. Results indicate the method is successful and reveal temporal radiocarbon reservoir effects that appear related to the changes in the depositional environment and/or hydroclimate. The method presented here is widely applicable across multiple environments.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Ota, Kosuke

Yokoyama, Yusuke

Miyairi, Yosuke

Obrochta, Stephen P.

Yamamoto, Shinya

Hubert, Aurelia ; Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire

Heyvaert, V.M.A.

Batist, Marc De

Fujiwara, Osamu

Language :

English

Title :

Development of an automated extraction and radiocarbon dating method for fossil pollen deposited in lake Motosu, Japan

Publication date :

September 2024

Journal title :

Quaternary Science Advances

ISSN :

2666-0334

Publisher :

Elsevier BV

Volume :

Pages :

100207

Peer reviewed :

Peer reviewed

Additional URL :

https://api.elsevier.com/content/article/PII:S2666033424000455?httpAccept=text/xml

Name of the research project :

Core Research for Evolutional Science and Technology

Funders :

BELSPO - Belgian Federal Science Policy Office
JST - Japan Science and Technology Agency
JSPS - Japan Society for the Promotion of Science

Available on ORBi :

since 13 September 2024

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