NDLI: Terrestrial n-alkane signatures in the middle Okinawa Trough during the post-glacial transgression: control by sea level and paleovegetation confounded by offshore transport

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Terrestrial n-alkane signatures in the middle Okinawa Trough during the post-glacial transgression: control by sea level and paleovegetation confounded by offshore transport

Geo-Marine Letters : Volume 30, Issue 1, February 2010

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Terrestrial n-alkane signatures in the middle Okinawa Trough during the post-glacial transgression: control by sea level and paleovegetation confounded by offshore transport

Content Provider	Springer Nature Link
Author	Zhang, Jie Yu, Hua Jia, Guodong Chen, Fajin Liu, Zhenxia
Copyright Year	2009
Abstract	We report records of land plant-derived long-chain n-alkanes since 37 ka b.p. from a sediment core in the middle Okinawa Trough, East China Sea. The data show the content and carbon preference index (CPI; degree of freshness) of n-alkanes generally decreasing as sea level rose, which could be explained by coastline retreat resulting in an increased transport route of n-alkanes toward the study site. The n-alkane CPI returned to higher values during the Holocene highstand, however, suggesting sea-level rise was not the only cause for the decline of freshness of n-alkanes. Paleovegetation changes in terms of C3 vs. C4 contributions inferred from n-alkane δ13C are overall consistent with published marine and terrestrial records during two distinct intervals: from 37.0 to 15.2 ka b.p., and from 7.6 ka b.p. to the present. However, n-alkane δ13C excursions from 15.2 to 7.6 ka b.p. are difficult to reconcile with terrestrial signatures. This disagreement, along with other possible causes for the decline of freshness of n-alkanes, and the higher-energy sedimentary environment inferred from increased mean grain sizes and silt/clay ratios during this time period, is consistent with existing knowledge of offshore transport of materials previously stored on the extensive continental shelf during the post-glacial transgression. We therefore suggest that n-alkane records from the Okinawa Trough should be used only cautiously to infer deglacial vegetation and sea-level changes.
Starting Page	143
Ending Page	150
Page Count	8
File Format	PDF
ISSN	02760460
Journal	Geo-Marine Letters
Volume Number	30
Issue Number	2
e-ISSN	14321157
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-11-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geology
Content Type	Text
Resource Type	Article
Subject	Environmental Science Geotechnical Engineering and Engineering Geology Oceanography

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