INDICATIONS OF INTERMEDIATE COMPOSITIONS IN THE BaSO4-SrSO4 SOLID-SOLUTION SERIES FROM THE BAHCECIKTEPE CELESTINE DEPOSIT, SIVAS, EAST-CENTRAL ANATOLIA, TURKEY

Teki̇n, Erdoǧan; Varol, Baki; Sayili, I. Sönmez; Elerman, Y.

doi:10.2113/gscanmin.40.3.895

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…The various types of celestite occurrences hosted by Tertiary evaporite deposits and molasse-type sediments of the Sivas Basin, in east-central Anatolia, Turkey, are located not far from the deposit under study in Cyprus and developed during the same period of time (Tekin et al, 2002b). Celestite mineralization occurs among other sediments in evaporitic series.…”

Section: Introductionmentioning

confidence: 89%

Miocene diagenetic and epigenetic strontium mineralization in calcareous series from Cyprus and the Arabian Gulf: Metallogenic perspective on sub- and suprasalt redox-controlled base metal deposits

Dill

Henjes‐Kunst

Berner

et al. 2009

Journal of Asian Earth Sciences

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Section: Introductionmentioning

confidence: 89%

Miocene diagenetic and epigenetic strontium mineralization in calcareous series from Cyprus and the Arabian Gulf: Metallogenic perspective on sub- and suprasalt redox-controlled base metal deposits

Dill

Henjes‐Kunst

Berner

et al. 2009

Journal of Asian Earth Sciences

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“…If any biological process leads to the formation of such phases, they should dissolve when put in the conditions of open ocean waters. So, this undersaturation of ocean waters with respect to solid solutions of intermediate compositions provides another reason for the rare occurrence of such (Ba,Sr)SO 4 in the ocean minerals (Tekin et al, 2002), in addition to the strong Ba/ Sr fractionation induced by the large celestine to barite solubility product ratio (see Section 2). We have calculated the variation of the saturation index and of the barium content of the solid solution, with the A 0 parameter of the solid solution.…”

Section: Thermodynamic Properties Of the (Basr)so 4 Solid Solutionmentioning

confidence: 99%

The saturation state of the world’s ocean with respect to (Ba,Sr)SO4 solid solutions

Monnin

Cividini

2006

Geochimica et Cosmochimica Acta

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Barite is commonly found in suspended matter in ocean waters and in marine sediments. The calculation of the barite saturation index of the world's ocean waters has shown that the vast majority of the oceans are undersaturated with respect to pure barium sulfate, equilibrium being reached at a few locations like the Southern Ocean surface waters, deep waters of the Bay of Bengal or intermediate waters of the Pacific [Monnin, C., Jeandel, C., Cattaldo, T., Dehairs, F. 1999. The marine barite saturation state of the world's oceans. Mar. Chem. 65 (3-4), 253-261.]. It is thus paradoxical to commonly find barite in a globally undersaturated ocean. Strontium is the most common impurity in natural barite. It is often suggested that the Ba content of ocean waters is controlled by equilibrium with Sr-substituted barite, and not with pure BaSO 4 . In order to address this problem, we have used the GEOSECS data (49 stations, 1404 data points) to calculate the saturation index of substituted barite in the world's ocean using Lippmann's description of thermodynamic equilibrium between a solid solution and an aqueous solution for the (Ba,Sr)SO 4 system. Recent studies indicate that the (Ba,Sr)SO 4 solid solution is most likely regular and continuous. The calculated saturation indices of the regular solid solution (with the interaction parameter A 0 equal to 1.6) are closer to those of pure barite than those calculated for the ideal solid solution. Conclusions previously reached for the pure barite case are not changed: the saturation state of ocean waters with respect to a regular solid solution is very close to that of pure barite. Sr-substitution for Ba in barium sulfate does not bring barite at equilibrium. When equilibrium is reached, the degree of Sr substitution of Ba amounts to only a few mole percent of Sr. Equilibrium values of the Sr content of the solid solutions in the intermediate (0.2-0.8) range are found for ocean surface waters where the Ba/Sr ratio is low, but as these waters are undersaturated, such solids are not stable in the water column. This provides another reason for the bimodal distribution of (Ba,Sr)SO 4 solid solutions in nature, on top of that induced by the large ratio of the end member solubility products. Equilibrium is found for cold waters (i.e. for temperatures below 5°C) having a Ba content greater than about 70 nmol/kg. The distribution coefficient of Sr in barite can be calculated from the Ba and Sr concentrations of these samples and from the equilibrium Sr mole fraction of the solid solution obtained from Lippmann's diagram. It was found independent of pressure and it varies only slightly with the temperature of the sample. For the regular solid solution (with A 0 = 1.6), it is:BaSO 4 ðregularÞ ¼ 10 5 m Ba 2þ ;aq m Sr 2þ ;aq x BaSO 4 ;SS x SrSO 4 ;SS 2 6 4 3 7 5 ¼ 0:227t þ 3:753:This expression (which has been established for temperatures below 5°C) can be used to directly calculate the composition of solid solutions at equilibrium with a given seawater sample, or conversely to know the ...

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“…Compositional bands in Flybye barite alternate rhythmically along crystal growth axes and do not show the systematic increases or decreases in atomic weight typical of closed system and diagenetic barite (Hannington & Scott, 1988; Hanor, 2000; Tekin et al. , 2002).…”

Section: Relict Barite Tufa Compositionmentioning

confidence: 99%

Petrography and textural development of inorganic and biogenic lithotypes in a relict barite tufa deposit at Flybye Springs, NT, Canada

2007

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A relict mound of Holocene barite (BaSO 4 ) tufa underlies the Flybye Springs, a small, barium-rich, cold sulphur spring system in the Northwest Territories of Canada. The tufa is composed of relatively pure barite with £0AE34 wt% Ca 2+ and £0AE77 wt% Sr 2+ . The mound is made up of coated bubble, raft, undulatory sheet, stromatolitic, coated grain and detrital conglomerate barite tufa. Although previously unreported in barite, these lithotypes are akin to facies found in many carbonate spring deposits. Raft and ooid-coated grain tufa was formed via 'inorganic' barite precipitation in spring water ponds and tributaries where rapid oxidation of sulphide to sulphate established barite supersaturation. Undulatory sheet tufa may have formed by the reaction of dissolved barium with sulphate derived from the oxidation of extracellular polysaccharide-rich colloidal sulphur films floating in oxygenated, barite-saturated spring water ponds. Coated bubble, oncoid-coated grain and stromatolitic tufa with filamentous microfossils was formed in close association with sulphur-tolerant microbes inhabiting dysoxic and oxygenated spring water tributaries and ponds. Adsorption of dissolved barium to microbial extracellular polysaccharide probably facilitated the development of these 'biogenic' lithotypes. Detrital conglomerate tufa was formed by barite cementation of microdetrital tufa, allochthonous lithoclasts and organic detritus, including caribou hair. Biogenic textures, organic artefacts and microfossils in the Flybye barite tufa have survived diagenetic aggradational recrystallization and precipitation of secondary cements, indicating the potential for palaeoecological information to be preserved in barite in the geological record. Similarities between the Flybye barite tufa and carbonate spring deposits demonstrate that analogous textures can develop in chemical sedimentary systems with distinct mineralogy, biology and physiochemistry.

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INDICATIONS OF INTERMEDIATE COMPOSITIONS IN THE BaSO4-SrSO4 SOLID-SOLUTION SERIES FROM THE BAHCECIKTEPE CELESTINE DEPOSIT, SIVAS, EAST-CENTRAL ANATOLIA, TURKEY

Cited by 14 publications

References 16 publications

Miocene diagenetic and epigenetic strontium mineralization in calcareous series from Cyprus and the Arabian Gulf: Metallogenic perspective on sub- and suprasalt redox-controlled base metal deposits

Miocene diagenetic and epigenetic strontium mineralization in calcareous series from Cyprus and the Arabian Gulf: Metallogenic perspective on sub- and suprasalt redox-controlled base metal deposits

The saturation state of the world’s ocean with respect to (Ba,Sr)SO4 solid solutions

Petrography and textural development of inorganic and biogenic lithotypes in a relict barite tufa deposit at Flybye Springs, NT, Canada

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