A comparison of sedimentary aliphatic hydrocarbon distribution between the southern Okinawa Trough and a nearby river with high sediment discharge
Resource
Estuarine, Coastal & Shelf Science (66),217-224
Journal
Estuarine
Journal Issue
66
Pages
217-224
Date Issued
2005-11-02
Date
2005-11-02
Author(s)
Jeng, W.L.
Huh, C.A.
DOI
246246/2006111501265206
Abstract
Twelve surface sediments from the southern Okinawa Trough (OT) and nine surface sediments from a nearby river, the Lanyang River (LR),
with high sediment discharge were analyzed for comparison of their aliphatic hydrocarbon distributions. Performing cluster analysis on all hydrocarbon
data of LR and OT sediments showed that the two areas had a similarity level of only 0.15, meaning that they were quite dissimilar.
The average ratio of terrigenous to aquatic n-alkanes was 0.99 for LR sediments and 9.64 for OT sediments, indicating that the concentrations of
n-alkanes in LR and OT sediments were quite different. Furthermore, the mean pristane/phytane ratios for LR and OT sediments were 1.01 and
2.57, respectively; the difference between them was significant (Student’s t test, at the 99% significance level). The carbon preference index
(CPI) of C25eC33 n-alkanes averaged 3.26 (range 2.16e4.59) for LR sediments and 2.92 (range 2.35e5.24) for OT sediments; no significant
difference was found between the two CPI averages (Student’s t test, at the 99% confidence level). However, higher plant n-alkanes generally
maximized at C29 for LR sediments, but maximized at C31 for all OT sediments, strongly indicating significant differences in the origins of the
hydrocarbons in these two areas. All present results appear to suggest that LR sediments are not a major hydrocarbon source for OT sediments.
In addition, there was no positive, linear correlation between diploptene (hop-22(29)-ene) and terrestrial higher plant n-alkanes for LR and OT
sediments.
Subjects
Okinawa Trough
sediment
higher plants
hydrocarbons
Publisher
Taipei:National Taiwan University Dept Mech Engn
Type
journal article
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