(PDF) Chapter 4. Barium in the Ocean - ResearchGate
salt of barium is barium sulfate, barite (BaSO 4), with a solubility product (Ba+2 [M] x SO 4-2[M]) of approximately 1.05 x 10-10 (Snavely, 1989a,b). Because ofBarite formation in the ocean: Origin of amorphous and,,20-04-2019· Abstract. Ocean export production is a key constituent in the global carbon cycle impacting climate. Past ocean export production is commonly estimated by means of barite and Barium proxies. However, the precise mechanisms underlying barite precipitation in the undersaturated marine water column are not fully understood.Marine barite and celestite saturation in seawater,,01-03-2000· Accordingly, we have determined the stoichiometric solubility products of strontian barite as a function of salinity and temperature: ln Ba K sp ′=247.88−38.333 ln T− 15421 T +1.27S 0.3 Using our model results for the total solubility product of the Sr-barite phase and seawater Ba and SO 4 concentration data, we conclude that the maximum saturation level ofBarite in the ocean – occurrence, geochemistry and,,Barite formed within sediments or at the sea floor from pore water fluids (diagenetic or cold seeps barite) can aid in understanding fluid flow and sedimentary redox processes, and barite formed in association with hydrothermal activity (hydrothermal barite) provides information about conditions of crust alteration around hydrothermal vents.Chemical isolation and isotopic analysis of terrigenous,,Marine barite (BaSO 4) is found in sinking particulate matter throughout the world's oceans, and occurs as dense, insoluble, typically ovoid crystals approximately 2–5 μm in diameter (Griffith and Paytan, 2012; Martin et al., 1995; Paytan et al., 2002; Paytan et al., 1993; Yao et al., 2021).Excluding surface waters in specific regions of the Southern Ocean, intermediateA comparison between excess barium and barite as,,barite, (2) compared carbon export calculated using core top Ba excess values and the Dymond et al. [1992] algorithm to measured oceanic carbon export flux, and (3) correlated barite accumulation rates in core tops from throughout the global oceans to 14C and Chlorophyll a (Chl a) primary production and carbon export. 2. Methods
A comparison between excess barium and barite as,
27-03-2003· 2.1. Barite Separation [10] Barite was separated from the sediment using a sequential leaching procedure that includes reaction with acetic acid, sodium hypochlorite, hydroxylamine, and an HF-HNO 3 mixture [Collier and Edmond, 1984; Paytan, 1996; Paytan et al., 1996].During barite extraction, each of the leaching steps targets a major (operationallyMinerals | Free Full-Text | Controls on Barite Crystal,,Barite (BaSO4) is a stable and widely distributed mineral in Earth’s crust. As such, barite has the potential to preserve specific geochemical and morphological characteristics representative of conditions at the time of its formation, which could be useful for interpretations of Earth’s ancient rocks and paleoenvironments. In this study, we used variations in saturation index, solution,Barite and barium in sediments and coral skeletons around,,05-12-2007· Barite and barium concentrations in bottom sediments and coral skeletons from the vicinity of the hydrocarbon exploration well drilled in 1992–1993 in the Træna Deep, Norwegian Sea have been studied to assess the spreading of the drilling mud and related ecological effects on Lophelia petrusa coral reefs. Sand size barite crystals derived from the drilling mud andPelagic barite precipitation at micromolar ambient sulfate,,07-11-2017· Barium-isotopic constraints on barite genesis. In the modern ocean, the flux of pelagic barite arriving at the seafloor is linked to the production and remineralization ofA novel selective extraction for barite from marine sediments,barite content was then determined from the difference between bulk-Ba and the sum of these four steps. These authors and Des Combes et al. (1999) applied this scheme to Indian Ocean sediments to obtain estimates of palaeoproductivity. Similar extraction techniques have alsoAn Experimental Investigation of Pristine Barite,,sodium laureate, sodium oleate, sodium dodecyl and sulfonate can modify the nature of adsorption [2, 3]. Barite also carries a negative charge at 0.3 point charges per 100 nm 2 arising from Ba2+ ions dissolution. Additionally, there is an
Ra in barite: Absolute dating of Holocene Southern Ocean,
Southern Ocean. MATERIAL AND METHODS Barite crystals were separated from core PS2102-2 (538049S, 048599W, 2390 m water depth) by using a protocol designed for opal-rich sediments. A heavy liquid at a density of 2.8 g/cm3 (LST Fastfloat, which consists of low-toxicity sodium heteropolytungstates dis-solved in water) was employed to separate theMicrotexture and distribution of minerals in hydrothermal,,Microtexture and distribution of minerals in hydrothermal barite-silica chimney from the Franklin seamount, SW Pacific: Constraints on the, The back-arc and marginal basins in southwest Pacific Ocean (e.g. Lau basin, Manus basin, Woodlark Basin, Fiji Basin, L-6 contains rare sodium-iron-sulfate mineral, metasideronatrite, [Na2,Barium in planktonic foraminifera,These barite crystals are a potential source of contamination to determinations of lattice-bound Ba in foraminifera. Barite is found in samples from both sediment cores and sediment traps, so at least some portion of the barite must be formed in theBarite and barium in sediments and coral skeletons around,,05-12-2007· Barite and barium concentrations in bottom sediments and coral skeletons from the vicinity of the hydrocarbon exploration well drilled in 1992–1993 in the Træna Deep, Norwegian Sea have been studied to assess the spreading of the drilling mud and related ecological effects on Lophelia petrusa coral reefs. Sand size barite crystals derived from the drilling mud andBarite formation in the Southern Ocean water column,,Abstract The intensity of past biological activity can be correlated with the occurrence of suspended and sedimented barite (BaS04). To date, there is a lack of information on the processes controlling the production of pelagic barite. During the EPOS-2 cruise (November–December 1988 ), situated in the Scotia Sea-Weddell Sea Confluence,A novel selective extraction for barite from marine sediments,barite content was then determined from the difference between bulk-Ba and the sum of these four steps. These authors and Des Combes et al. (1999) applied this scheme to Indian Ocean sediments to obtain estimates of palaeoproductivity. Similar extraction techniques have also
Pelagic barite precipitation at micromolar ambient sulfate,
07-11-2017· Barium-isotopic constraints on barite genesis. In the modern ocean, the flux of pelagic barite arriving at the seafloor is linked to the production and remineralization ofMicrotexture and distribution of minerals in hydrothermal,,Microtexture and distribution of minerals in hydrothermal barite-silica chimney from the Franklin seamount, SW Pacific: Constraints on the, The back-arc and marginal basins in southwest Pacific Ocean (e.g. Lau basin, Manus basin, Woodlark Basin, Fiji Basin, L-6 contains rare sodium-iron-sulfate mineral, metasideronatrite, [Na2,An Experimental Investigation of Pristine Barite,,sodium laureate, sodium oleate, sodium dodecyl and sulfonate can modify the nature of adsorption [2, 3]. Barite also carries a negative charge at 0.3 point charges per 100 nm 2 arising from Ba2+ ions dissolution. Additionally, there is anEffect of modified starch on separation of fluorite from,,barite (Lu, 2010) using sodium oleate as a collector. Zhang et al. (2015) examined the activation mechanism of Fe3+ in fluorite flotation and the results showed that iron hydroxide (Fe(OH) 3) was the major active component in flotation in the 3+appropriate pH range (pH 6-8). Lu,Barium in planktonic foraminifera,These barite crystals are a potential source of contamination to determinations of lattice-bound Ba in foraminifera. Barite is found in samples from both sediment cores and sediment traps, so at least some portion of the barite must be formed in thePHOSPHORUS BARITE CONCENTRATIONS G 1221 P /E B 1,Wilson, P.A., Lyle, M., and Firth, J.V. (Eds.) Proceedings of the Ocean Drilling Program, Scientific Results Volume 199 PHOSPHORUS AND BARITE CONCENTRATIONS AND GEOCHEMISTRY IN SITE 1221 PALEOCENE/EOCENE BOUNDARY SEDIMENTS1 Kristina L. Faul2, and Adina Paytan3 ABSTRACT We determined changes in equatorial Pacific phosphorus (µmol P/g)
The possible role of thiosulfate in the precipitation of,
The precipitation of extremely 34 S-rich barite in the late stage of mineralization in the Mississippi Valleytype deposits of the Illinois-Kentucky district (U.S.A.) may be explained by reactions involving thiosulfate (S 2 O = 3).Inorganic processes are known to concentrate 34 S in the sulfonate site of thiosulfate and 32 S in the sulfate site. In the mineralizing solution, these,,,,,
