Rare earth elements in pore waters of marine sediments

Haley, Brian A.; Klinkhammer, Gary P.; McManus, James

doi:10.1016/j.gca.2003.09.012

Cited by 586 publications

(449 citation statements)

References 80 publications

(134 reference statements)

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“…Nevertheless the REE patterns shown in Fig. 3 suggest that the dominant REE (and hence Nd) signal is derived from the FeeMn oxyhydroxide phase, otherwise the PAAS-normalised patterns would be flat and would not display a shale-normalised MREE enrichment indicative of dissolved FeeMn oxyhydroxide phases (Haley et al, 2004). Moreover, based on the mass balance calculations presented in Gutjahr et al (2007) we consider the extracted authigenic FeeMn oxyhydroxide signal insensitive to detrital contamination.…”

Section: Extracted Leachate Major and Trace Element Compositionmentioning

confidence: 99%

Changes in North Atlantic Deep Water strength and bottom water masses during Marine Isotope Stage 3 (45–35kaBP)

Gutjahr

Hoogakker

McCave

2010

Quaternary Science Reviews

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a b s t r a c tThe strength of the North Atlantic Meridional Overturning Circulation during climatically highly variable Marine Isotope Stage (MIS) 3 has attracted much attention in recent years. Here we present highresolution Nd isotope compositions of past seawater derived from authigenic FeeMn oxyhydroxides recovered from drift sediments on the Blake Ridge in the deep western North Atlantic (ODP Leg 172, Site 1060, 3481 m water depth). The data cover the period from 45 to 35 ka BP, tracing circulation changes during major Heinrich iceberg discharge event 4 (H4, w40e39 ka BP). The Nd isotope record suggests that there was no northern-source water (NSW) mass like modern NADW at the deeper part of Blake Ridge at any time between 45 and 35 ka. This is fundamentally different from the hydrographic situation during the Holocene where NADW extends below 4500 m at this location. The 3 Nd of past deep water recorded in the Blake Ridge sediments was least radiogenic during Dansgaard/Oeschger (D/O) Interstadial (IS) 8 (3 Nd ¼ À11.3) and most radiogenic immediately preceding IS 9 (3 Nd ¼ À9.8). More radiogenic compositions were also recorded during H4 (À10.2 3 Nd À9.9). The Nd isotope variability in MIS 3 matches that of a physical bottom current strength reconstruction from the same location. Neither record follows the pattern of Northern Hemisphere D/O climatic cycles. In our record, reduced mixing with northern source waters started in stadial 12 and lasted until after H4 in stadial 9, followed by a rapid increase in NSW contribution thereafter. This major change in the Nd isotope record predates the iceberg discharge event Heinrich 4 by more than 3 ka indicating a shallowing of the water mass boundary between Glacial North Atlantic Intermediate Water and Southern Source Water beneath. This early change in bottom water properties at the deep Blake Ridge suggests that North Atlantic deep water advection may already have decreased several thousand years before the actual iceberg discharge event and associated freshening of the surface waters in the North Atlantic. The change can thus not be attributed to climatic events in the North Atlantic but may be related to changes in flux of deep water from the South.

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Section: Extracted Leachate Major and Trace Element Compositionmentioning

confidence: 99%

Changes in North Atlantic Deep Water strength and bottom water masses during Marine Isotope Stage 3 (45–35kaBP)

Gutjahr

Hoogakker

McCave

2010

Quaternary Science Reviews

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“…1 in Mozley and Wersin, 1992). The prolonged anoxic conditions, high pore water alkalinity and high Fe concentration are also suggested by the enrichment of MREE (Haley et al, 2004) and the lack of a Ce anomaly (see discussion below). The siderite precipitation rate is eight orders of magnitude slower than that of calcite (Jimenez-Lopez and Romanek, 2004) and therefore, the formation of siderite concretions is likely to be stable under supersaturated conditions fostering LREE fractionation.…”

Section: Redox Conditions During Sedimentationmentioning

confidence: 91%

“…Several studies showed that REE are not affected by fractionation processes during precipitation of aragonite and calcite (see discussion in Rongemaille et al, 2011) whereas REE distribution tends to vary significantly in sediments according to the redox variations within the pore water (e.g., Haley et al, 2004). Nevertheless, the use of carbonates as a proxy for the REE content of ancient seawater is complicated by possible modification due to the presence of: i) REE-bearing terrigenous components (Goldstein and Jacobsen, 1988;Elderfield et al, 1990); ii) Fe-Mnoxy-hydroxides Bayon et al, 2004) and iii) phosphates, which might have a non-uniform REE incorporation (German and Elderfield, 1990;Byrne et al, 1996).…”

Section: Redox Conditions During Sedimentationmentioning

confidence: 99%

“…11A). Both limestone and Fe-oxy-hydroxide REE patterns are relatively flat (average Pr SN /Yb SN ¼ 1.10 and 1.01, respectively) with a slight MREE enrichment (Gd SN /Yb SN ¼ 1.28 and 1.45, respectively), which is typical of precipitates formed in oxic to sub-oxic pore water (Haley et al, 2004). Under such conditions the REE pattern lacks Ce and Gd anomalies and the precipitates are expected to inherit these characteristics from the reacting water.…”

Section: Redox Conditions During Sedimentationmentioning

confidence: 99%

“…The Ce anomaly is a valuable tool for unraveling the redox condition at time of authigenic mineral precipitation (e.g., Hu et al, 2014). The value of the Ce anomaly is thought to be indicative of redox state (Haley et al, 2004 and citations therein), being negative (ca. 0.2e0.4) under oxygenated conditions and positive under anoxic conditions (e.g., Olivier and Boyet, 2006;Hu et al, 2014;Tostevin et al, 2016).…”

Section: Redox Conditions During Sedimentationmentioning

confidence: 99%

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Authigenic minerals from the Paola Ridge (southern Tyrrhenian Sea): Evidences of episodic methane seepage

Franchi

Rovere

Gamberi

et al. 2017

Marine and Petroleum Geology

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a b s t r a c tPaola Ridge, along the NW Calabrian margin (southern Tyrrhenian Sea), is one of the few reported deep sea sites of precipitation of authigenic carbonates in the Tyrrhenian Sea. Here, the changing composition of the seeping fluids and the dynamic nature of the seepage induced the precipitation of pyrite, siderite and other carbonate phases. The occurrence of this array of authigenic precipitates is thought to be related to fluctuation of the sulfate-methane transition zone (SMTZ).Concretions of authigenic minerals formed in the near sub-bottom sediments of the Paola Ridge were investigated for their geochemical and isotopic composition. These concretions were collected in an area characterized by the presence of two alleged mud volcanoes and three mud diapirs. The mud diapirs are dotted by pockmarks and dissected by normal faults, and are known for having been a site of fluid seepage for at least the past 40 kyrs. Present-day venting activity occurs alongside the two alleged mud volcanoes and is dominated by CO 2 -rich discharging fluids. This discover led us to question the hypothesis of the mud volcanoes and investigate the origin of the fluids in each different domed structure of the study area.In this study, we used stable isotopes (carbon and oxygen) of carbonates coupled with rare earth element (REE) composition of different carbonate and non-carbonate phases for tracing fluid composition and early diagenesis of authigenic precipitates. The analyses on authigenic precipitates were coupled with chemical investigation of venting gas and sea-water.Authigenic calcite/aragonite concretions, from surficial sediments on diapiric structures, have depleted values. The siderite REE pattern shows consistent LREE (light REE) fractionation, MREE (medium REE) enrichment and positive Gd and La anomalies. As shown by the REE distribution, the 13 C-depleted composition and their association with chemosymbiotic fauna, calcite/aragonite precipitated at time of moderate to high methane flux close to the seafloor, under the influence of bottom seawater. Authigenic siderite, on the other hand, formed in the subseafloor, during periods of lower gas discharges under prolonged anoxic conditions within sediments in equilibrium with 13 C-rich dissolved inorganic carbon (DIC) and 18 O-rich water, likely related to methanogenesis and intermittent venting of deep-sourced CO 2 .

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Nd and Sr isotope compositions of different phases of surface sediments in the South Pacific: Extraction of seawater signatures, boundary exchange, and detrital/dust provenance

Molina-Kescher

Hathorne

2014

Geochem. Geophys. Geosyst.

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Rare earth elements in pore waters of marine sediments

Cited by 586 publications

References 80 publications

Changes in North Atlantic Deep Water strength and bottom water masses during Marine Isotope Stage 3 (45–35kaBP)

Changes in North Atlantic Deep Water strength and bottom water masses during Marine Isotope Stage 3 (45–35kaBP)

Authigenic minerals from the Paola Ridge (southern Tyrrhenian Sea): Evidences of episodic methane seepage

Nd and Sr isotope compositions of different phases of surface sediments in the South Pacific: Extraction of seawater signatures, boundary exchange, and detrital/dust provenance

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