Rare earth element mobility in the oceanic lower sheeted dyke complex: evidence from geochemical data and leaching experiments

Bach, Wolfgang; Irber, Wolfgang

doi:10.1016/s0009-2541(98)00087-4

Cited by 58 publications

(44 citation statements)

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“…F294A; see "Igneous petrology"). Alteration patches within dikes may be related to deformed primary porosity, amygdules, or inherited textural inhomogeneities that were strained by viscous flow during and/or shortly after emplacement (Bach and Irber, 1998) (see "Alteration-related structures," below, and "Alteration").…”

Section: Expedition 309/312 Scientists Site 1256mentioning

confidence: 99%

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Site 1256

2006

Proceedings of the IODP

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Section: Expedition 309/312 Scientists Site 1256mentioning

confidence: 99%

“…F305). It is not known exactly what phases the secondary minerals replace, but it has been suggested that they replaced glass or highly fractionated crystallized melt or that they filled pore space (Alt, Kinoshita, Stokking, et al, 1993;Bach and Irber, 1998) (see "Alteration"). Some of the patches are elliptical in shape (Fig.…”

Section: Alteration Patchesmentioning

confidence: 99%

Site 1256

2006

Proceedings of the IODP

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“…It has been hypothesized that dissolution of REEs from plagioclase controls the pattern shape of these elements in seafloor hydrothermal fluids because the chondrite-normalized REE compositions of MOR hydrothermal fluids and of plagioclase in basalt are similar Klinkhammer et al, 1994). In contrast, results of experimental studies suggest that REE compositions of seafloor vent fluids are unrelated to primary rock composition (e.g., plagioclase alteration) because REEN pattern shapes of experimental hydrothermal solutions are different from primary REE compositions of the volcanic rock or individual minerals with which these fluids have reacted (Bach and Irber, 1998;M6ller, 2002;Allen and Seyfried, 2005). Rather, experimental studies suggest that seafloor vent fluid REE compositions reflect solubility controls influenced by aqueous REE speciation/complexation (c.f.…”

Section: Introductionmentioning

confidence: 99%

Geochemical tracers of processes affecting the formation of seafloor hydrothermal fluids and deposits in the Manus back-arc basin

Craddock¹

2009

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, in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the field of Chemical Oceanography THESIS ABSTRACTSystematic differences in trace element compositions (rare earth element (REE), heavy metal, metalloid concentrations) of seafloor vent fluids and related deposits from hydrothermal systems in the Manus back-arc basin (Eastern Manus Basin, EMB and Manus Spreading Center, MSC) are used to investigate processes that affect their formation. Processes responsible for observed differences in fluids and deposits from distinct geologic settings include (a) fluid-rock interaction (with temperature, pressure and crustal composition as variables), (b) magmatic acid volatile input and, (c) local seawater entrainment and mixing with hydrothermal fluids, coupled with sulfide precipitation and metal remobilization. REE distributions in vent fluids in the Manus Basin exhibit a wide range of chondrite-normalized patterns that contrast with the relatively uniform distributions observed in mid-ocean ridge vent fluids. This heterogeneity is attributed to marked differences in fluid pH and fluoride and sulfate concentrations that significantly affect REE solubility. The data indicate that REEs can be used as indicators of the styles of magmatic acid volatile input in back-arc hydrothermal systems. Anhydrite in deposits record the same range of REE patterns, suggesting that REE distributions preserved in anhydrite can be used as indicators of past magmatic acid volatile input. Vent fluid heavy metal and metalloid concentrations also exhibit considerable differences. High metal concentrations in EMB versus MSC vent fluids reflect low pH, largely from input of magmatic acid volatiles (indicated by fluoride concentrations greater than seawater). In EMB, metal concentrations are locally affected by dissolution of previously deposited sulfide owing to low pH conditions affected by magmatic acid volatile input or seawater entrainment and mixing with hydrothermal fluid that leads to sulfide precipitation and secondary acidity generation. Massive sulfide deposits in the Manus Basin exhibit a wide range of mineral compositions and heavy metal enrichments. The formation of Zn-rich (sphalerite/wurtzite) deposits in the MSC and of Cu-Fe and Cu-As-rich (chalcopyrite, tennantite) deposits in the EMB reflects differences in the conditions of sulfide precipitation (temperature, pH) and in metal concentrations. The data suggest that heavy metal and metalloid distributions in massive sulfide deposits can be used as indicators of the conditions of vent deposit formation.Thesis Co-Supervisor: Dr. Margaret K. Tivey Title: Senior Scientist, Woods Hole Oceanographic Institution Thesis Co-Supervisor: Prof. Wolfgang Bach Title: Professor of Geochemistry, University of Bremen ACKNOWLEDGEMENTS Suddenly, I think it easier to discuss and distill five-plus of graduate education and research in a thesis dissertation than it is to appropriately pay homage to all those that made this academic journey possible in the first place. M...

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“…Results from leaching experiments are generally reported for pure water (e.g., Mö ller and Giese, 1997;Bach and Irber, 1998;Bau et al, 1998), and adsorption processes are investigated in a solution of known composition (Coppin et al, 2002;Takahashi et al, 2004). In order to compare the results obtained from our leaching experiment with literature data, we favoured the use of a trace-element-free seawater.…”

mentioning

confidence: 90%

“…Firstly, Humphris (1984) suggested that the mobility of YREEs during weathering processes of volcanic material is mainly influenced by: (i) temperature, (ii) aptitude of newly-formed minerals to accommodate YREEs, and (iii) chemistry of the interacting fluids. Therefore, because YREE release during weathering of volcanic materials is related to lanthanide distribution coefficients during the primary crystallisation phase of existing volcanic minerals (Shibata et al, 2006), it follows that the occurrence of poorly crystalline matter in ash represents a source of Lanthanides during weathering (Bach and Irber, 1998;Bau et al, 1998).…”

Section: Dissolved Phasementioning

confidence: 99%

Alteration effects of volcanic ash in seawater: Anomalous Y/Ho ratios in coastal waters of the Central Mediterranean sea

Censi

Sprovieri

Larocca

et al. 2007

Geochimica et Cosmochimica Acta

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This paper presents the results of a study based on data collected during the oceanographic cruise ANSIC 2001 carried out in the Ionian Sea during the explosive activity of Mount Etna in the summer of 2001. Anomalous low values of Y/Ho ratios in seawater suggest extensive scavenging processes on the surfaces of smectitic alteration products, with Y and Ho fractionation controlled by the differences in their electronic configurations and behaviour during solution/surface complexation equilibria. These processes can also be traced through the presence of significant tetrad effects recorded in the chondrite-normalised Rare Earth Elements and Yttrium (YREEs) patterns of suspended particulate matter. This suggests that the preferential Y scavenging from seawater is due to the formation of inner-sphere complexes with OH À groups on montmorillonite crystal surfaces. The preliminary results of kinetic experiments of YREE released from volcanic ash to coexisting seawater, and the related effects on Y/Ho ratios and Ce anomalies, are consistent with the fractionation of Light Rare Earth Elements (LREEs) with respect to Heavy Rare Earth Elements (HREEs) observed in dissolved phase. They suggest a behaviour of Y similar to that reported for LREEs, particularly for Ce and Pr.

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Rare earth element mobility in the oceanic lower sheeted dyke complex: evidence from geochemical data and leaching experiments

Cited by 58 publications

References 44 publications

Site 1256

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Geochemical tracers of processes affecting the formation of seafloor hydrothermal fluids and deposits in the Manus back-arc basin

Alteration effects of volcanic ash in seawater: Anomalous Y/Ho ratios in coastal waters of the Central Mediterranean sea

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