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• W2026731432 abstract "The branched/isoprenoid tetraether (BIT) index has recently been proposed as a qualitative proxy for the relative amounts of soil and marine derived organic matter (OM) in marine sediments. We compare BIT values with lignin–phenol CuO oxidation products and bulk OM proxies in surface sediment samples from Doubtful Sound, a fjord in the southwestern end of New Zealand’s South Island, as well as in soils and leaf litter from the local pristine temperate rainforest watershed. The region has extreme rates of annual rainfall (>7 m year−1) and large mass-wasting soil and vegetation events on fjord slopes, which results in relatively high fluxes of terrestrial organic matter (OMterr) to fjord sediments. Sediments contained up to 11.4% w/w organic carbon (OC) with terrestrial to a mixture of terrestrial/marine δ13C (−24.3‰ to −28.7‰) and C/N (14.7–36.8) signatures. BIT values ranged from 0.24 to 0.93. Lignin abundance in sediments, reported as Λ8 values (mg 8 lignin–phenols/100 mg OC−1), ranged from 2.7 to 11.2. A weak correlation was found between concentrations of lignin phenols and BIT values (R2 0.313). The likely cause of the differences between the two proxies is differences in the relative amounts of soil OM (OMsoil) and vegetation (intact and detrital) transported to the fjord by episodic mass-wasting events and gradual accumulation from overland (leaching by rainfall) and riverine sources. Interestingly, the BIT index correlated significantly with bulk sedimentary OM (OMsed) proxies (δ13C, R2 0.774) (C/N, R2 0.629), while lignin phenol values (Λ8) exhibited a much weaker correlation with δ13C values (R2 0.320) and no correlation with C/N values (R2 0.005). This suggests that OMsoil represents the dominant fraction of OMterr delivered to fjord sediments." @default.
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• W2026731432 date "2010-03-01" @default.
• W2026731432 modified "2023-10-10" @default.
• W2026731432 title "Comparison of lignin phenols and branched/isoprenoid tetraethers (BIT index) as indices of terrestrial organic matter in Doubtful Sound, Fiordland, New Zealand" @default.
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• W2026731432 doi "https://doi.org/10.1016/j.orggeochem.2009.10.009" @default.
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