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- W2014049345 endingPage "5048" @default.
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- W2014049345 abstract "Volcanogenic sediments are typically rich in Fe and Mn-bearing minerals that undergo substantial alteration during early marine diagenesis, however their impact on the global biogeochemical cycling of Fe and Mn has not been widely addressed. This study compares the near surface (0–20 cm below sea floor [cmbsf]) aqueous (<0.02 μm) and aqueous + colloidal here in after ‘dissolved’ (<0.2 μm) pore water Fe and Mn distributions, and ancillary O2(aq), NO3- and solid-phase reactive Fe distributions, between two volcanogenic sediment settings: [1] a deep sea tephra-rich deposit neighbouring the volcanically active island of Montserrat and [2] mixed biosiliceous–volcanogenic sediments from abyssal depths near the volcanically inactive Crozet Islands archipelago. Shallow penetration of O2(aq) into Montserrat sediments was observed (<1 cmbsf), and inferred to partially reflect oxidation of fine grained Fe(II) minerals, whereas penetration of O2(aq) into abyssal Crozet sediments was >5 cmbsf and largely controlled by the oxidation of organic matter. Dissolved Fe and Mn distributions in Montserrat pore waters were lowest in the surface oxic-layer (0.3 μM Fe; 32 μM Mn), with maxima (20 μM Fe; 200 μM Mn) in the upper 1–15 cmbsf. Unlike Montserrat, Fe and Mn in Crozet pore waters were ubiquitously partitioned between 0.2 μm and 0.02 μm filtrations, indicating that the pore water distributions of Fe and Mn in the (traditionally termed) ‘dissolved’ size fraction are dominated by colloids, with respective mean abundances of 80% and 61%. Plausible mechanisms for the origin and composition of pore water colloids are discussed, and include prolonged exposure of Crozet surface sediments to early diagenesis compared to Montserrat, favouring nano-particulate goethite formation, and the elevated dissolved Si concentrations, which are shown to encourage fine-grained smectite formation. In addition, organic matter may stabilise authigenic Fe and Mn in the Crozet pore waters. We conclude that volcanogenic sediment diagenesis leads to a flux of colloidal material to the overlying bottom water, which may impact significantly on deep ocean biogeochemistry. Diffusive flux estimates from Montserrat suggest that diagenesis within tephra deposits of active island volcanism may also be an important source of dissolved Mn to the bottom waters, and therefore a source for the widespread hydrogenous MnOx deposits found in the Caribbean region." @default.
- W2014049345 created "2016-06-24" @default.
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- W2014049345 date "2011-09-01" @default.
- W2014049345 modified "2023-09-26" @default.
- W2014049345 title "Iron and manganese diagenesis in deep sea volcanogenic sediments and the origins of pore water colloids" @default.
- W2014049345 cites W1517307429 @default.
- W2014049345 cites W1525830075 @default.
- W2014049345 cites W1543527980 @default.
- W2014049345 cites W1553913713 @default.
- W2014049345 cites W1555946803 @default.
- W2014049345 cites W1601823087 @default.
- W2014049345 cites W1632109035 @default.
- W2014049345 cites W1769233144 @default.
- W2014049345 cites W1964215238 @default.
- W2014049345 cites W1967066972 @default.
- W2014049345 cites W1968533178 @default.
- W2014049345 cites W1970266024 @default.
- W2014049345 cites W1973544948 @default.
- W2014049345 cites W1977233589 @default.
- W2014049345 cites W1977541820 @default.
- W2014049345 cites W1981219076 @default.
- W2014049345 cites W1981435364 @default.
- W2014049345 cites W1981510779 @default.
- W2014049345 cites W1982581483 @default.
- W2014049345 cites W1986944228 @default.
- W2014049345 cites W1987447231 @default.
- W2014049345 cites W1991150062 @default.
- W2014049345 cites W1995737122 @default.
- W2014049345 cites W1996259593 @default.
- W2014049345 cites W1997797057 @default.
- W2014049345 cites W1999903187 @default.
- W2014049345 cites W2002275332 @default.
- W2014049345 cites W2002978906 @default.
- W2014049345 cites W2003167051 @default.
- W2014049345 cites W2004765700 @default.
- W2014049345 cites W2006682379 @default.
- W2014049345 cites W2009256520 @default.
- W2014049345 cites W2010282358 @default.
- W2014049345 cites W2010933730 @default.
- W2014049345 cites W2016107453 @default.
- W2014049345 cites W2018041521 @default.
- W2014049345 cites W2022626025 @default.
- W2014049345 cites W2026987957 @default.
- W2014049345 cites W2033303392 @default.
- W2014049345 cites W2034275097 @default.
- W2014049345 cites W2034557601 @default.
- W2014049345 cites W2037102853 @default.
- W2014049345 cites W2039972114 @default.
- W2014049345 cites W2041412024 @default.
- W2014049345 cites W2042626509 @default.
- W2014049345 cites W2043668123 @default.
- W2014049345 cites W2044233272 @default.
- W2014049345 cites W2050943708 @default.
- W2014049345 cites W2053534901 @default.
- W2014049345 cites W2054066757 @default.
- W2014049345 cites W2058943237 @default.
- W2014049345 cites W2067961116 @default.
- W2014049345 cites W2068007066 @default.
- W2014049345 cites W2072863042 @default.
- W2014049345 cites W2077711976 @default.
- W2014049345 cites W2079326914 @default.
- W2014049345 cites W2082039283 @default.
- W2014049345 cites W2084240724 @default.
- W2014049345 cites W2086503561 @default.
- W2014049345 cites W2087983181 @default.
- W2014049345 cites W2090751775 @default.
- W2014049345 cites W2091875340 @default.
- W2014049345 cites W2093558791 @default.
- W2014049345 cites W2102761435 @default.
- W2014049345 cites W2104754700 @default.
- W2014049345 cites W2106500706 @default.
- W2014049345 cites W2111473359 @default.
- W2014049345 cites W2114797059 @default.
- W2014049345 cites W2120977583 @default.
- W2014049345 cites W2127371426 @default.
- W2014049345 cites W2128189208 @default.
- W2014049345 cites W2129508019 @default.
- W2014049345 cites W2129801818 @default.
- W2014049345 cites W2134307060 @default.
- W2014049345 cites W2138477892 @default.
- W2014049345 cites W2139577180 @default.
- W2014049345 cites W2142801711 @default.
- W2014049345 cites W2152188813 @default.
- W2014049345 cites W2157677644 @default.
- W2014049345 cites W2157959209 @default.
- W2014049345 cites W2161582133 @default.
- W2014049345 cites W2164424086 @default.
- W2014049345 cites W2167166182 @default.
- W2014049345 cites W2167881866 @default.
- W2014049345 cites W2317552659 @default.
- W2014049345 cites W4243902381 @default.