Journal
ORGANIC GEOCHEMISTRY
Volume 76, Issue -, Pages 288-294Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2014.09.008
Keywords
Perylene; Okinawa Trough; Biomarker; Compound specific isotope analysis; Polycyclic aromatic hydrocarbons
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Funding
- National Basic Research Program of China [2014CB954001]
- National Science Foundation of China [41176164, 41476062]
- U.S. National Science Foundation (NSF)
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Perylene, a five-ring nuclear polycyclic aromatic hydrocarbon (PAH), has a different distribution pattern from anthropogenic PAHs. Its source, however, remains obscure, limiting its application as an environmental indicator. Here we examine perylene in the upper 85 m sediments of the ODP Hole 1202B from the southern Okinawa Trough. Over the past 20,000 years, the mass accumulation rate of perylene is substantially higher in the last deglaciation than the Holocene and last glacial maximum. Perylene presents a strong correlation with C-31 n-alkane (r = 0.55; p < 0.001), a biomarker for terrigenous organic matter, and a weak correlation with C-37:2 alkenone (r = -0.04; p = 0.23), a biomarker for marine organic matter. The mean delta C-13 value of perylene (-22.8% +/- 0.6%) is substantially higher than that of long chain n-alkanes (-30.7 +/- 0.4%), but close to that of fluvial organic matter in adjacent areas (-24.0% to -25.0%). Our results strongly suggest that the perylene is of a terrigenous origin likely from soil fungi, and may be a useful tracer for soil organic carbon in marine environments. (C) 2014 Elsevier Ltd. All rights reserved.
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