In:
Radiocarbon, Cambridge University Press (CUP), Vol. 62, No. 2 ( 2020-04), p. 439-451
Abstract:
Differential sources of sedimentary organic compounds in a volcanic region were revealed by determining radiocarbon content (Δ 14 C) of organic compounds in surface sediments from Lake Kawaguchi, at the northern foot of Mount Fuji, central Japan. The Δ 14 C values of C 16 fatty acid (−124‰) and chlorophyll a (Chl a ) (−133‰) were similar to the Δ 14 C of dissolved inorganic carbon (DIC) in surface water (−117‰), suggesting that a significant portion of these compounds originated from modern primary producers with a reservoir age of ~1000 years. On the other hand, a large offset between the Δ 14 C values of Chl a (−133‰) and those of 13 2 , 17 3 -cyclopheophorbide- a -enol (−169‰) and pheophytin a (−179‰) suggested contributions from older pigments. In addition, the Δ 14 C of long-chain (C 24 , C 26 , and C 28 ) fatty acids (−183 to −75‰) showed a large offset from that of a plant leaf remain (0‰) within sediments, demonstrating that the long-chain fatty acids were affected by substantial contributions from pre-aged terrestrial materials. Overall, the sedimentary organic compounds gave 14 C ages older than the plant leaf fragment within sediments; however, the similarity between Δ 14 C of the C 16 fatty acid and DIC implies potential for applying compound-specific radiocarbon analysis as a dating tool in volcanic lake environments.
Type of Medium:
Online Resource
ISSN:
0033-8222
,
1945-5755
DOI:
10.1017/RDC.2019.158
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
2020
detail.hit.zdb_id:
2028560-7
SSG:
11
SSG:
13
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