ライフサイエンスコーパス: barite

1 om the sulfur isotopic composition of marine barite.

2 n removing nitrate and other contaminants in barite.

3 y 1 million years was generated using marine barite.

4 ) isotope record derived from pelagic marine barite.

5 enhanced uptake of lead and selenate on the barite (001) surface through two sorption mechanisms: la

6 ios for the uptake of Ra by already existent barite: (1) formation of a Ba1-xRaxSO4 solid solution su

7 19% of Se is present as selenite (Se(4+)) in barite, 21% of Se is present as exchangeable Fe oxyhydro

8 understanding of the geochemical behavior of barite accumulation in shale matrices under conditions t

9 Fluctuations in barite accumulation rates down-core indicate that during

10 as removed by coprecipitation with secondary barite and adsorption on Mn-Fe precipitates in the near-

11 Multiple and distinct layers of diagenetic barite and dolomite, i.e., minerals that typically form

12 ith the primary minerals sphalerite, pyrite, barite, and chalcopyrite and secondary Fe oxyhydroxides.

13 These barites are interpreted as primary volcanic emissions fo

14 Hard sulphate scales, like barite, are frequently the result of incompatible intera

15 In conclusion, the addition of Ra to a barite at close to equilibrium conditions has a major im

16 Sr-bearing marine barite [(Ba (x) , Sr(1-x) )SO(4)] cycling has been widel

17 Geochemical analyses of sedimentary barites (barium sulfates) in the geological record have

18 Barite (BaSO(4)) precipitation is one of the most ubiqui

19 nd detachment of a barium ion onto a stepped barite (BaSO(4)) surface.

20 The precipitation of barite (BaSO(4)) was chosen as a model system to test th

21 An empirical correlation between marine barite (BaSO4) accumulation rate in core-top sediment sa

22 y, the bioavailability and toxicity of Ba in barite (BaSO4) contaminated soils was studied using stan

23 novel method of generating O2 directly from Barite (BaSO4) for simultaneous analysis of delta18O and

24 Barite contaminated soils were shown to negatively impac

25 onmosbiensis was present among carbonate and barite crusts, constituting the first record of frenulat

26 The growth of a single barite crystal was simulated to demonstrate the solver's

27 ents that utilize 17O-anomalous solutions or barite crystals is conducted to examine the effect on ox

28 (up to 28% by weight) of nitrate occluded in barite crystals that cannot be simply washed away.

29 pitation of secondary minerals, particularly barite, decreasing effective fracture volume by 1-3%.

30 (15)N, concurrent with an increase in marine barite delta(34)S and enhanced ocean productivity during

31 ater values do not overlap with drilling mud barite (delta(138)Ba ~ 0.0 per mille) and are significan

32 ion may account for the genesis of enigmatic barite deposits.

33 usand is associated with non-(33)S-anomalous barites displaying negative (36)S values, which are best

34 A series of barite dissolution and reprecipitation experiments that

35 idely used for chemical paleoceanography are barite, evaporite sulfates, and hydrogenous ferromangane

36 cision models makes them a reliable tool for barite exploration within the Mid-Nigerian Benue Trough

37 a mechanistic explanation for Sr-rich marine barite formation and offers insights for understanding a

38 ution nucleation rates; instead, the Sr-poor barite formation in bulk solution was found to be contro

39 d on organics, while micrometer-size Sr-poor barites formed in bulk solutions.

40 The Sr enrichment in barites formed on organic films was found to be controll

41 The results show that barite forms on organic films from undersaturated soluti

42 ng bacteria, evidenced by mineral sulphates (barite) found only in the skin.

43 lso find that the (17)O isotope anomalies of barites from Marinoan (approximately 635 million years a

44 Indeed, barium-isotopic analyses of barites from the Paleoarchean Dresser Formation are cons

45 t these variables cause a time-dependency of barite growth rates in microporous silica.

46 late the formation and composition of marine barites; however, the specific organic-mineral interacti

47 for interpreting the temporal occurrence of barites in the geological record.

48 level and are supersaturated with respect to barite, indicating the potential for surface and aqueous

49 , indicating a complete recrystallization of barite into a Ba1-xRaxSO4 solid solution.

50 Marine barite is an effective alternative monitor of seawater 8

51 nd negatively correlated with sulfate, while barite is approximately saturated.

52 Occlusion of DTPA itself in barite is negligible.

53 analysis of impoundment sludge revealed that Barite is the main carrier of Ra-226 in the sludge.

54 h is globally undersaturated with respect to barite, is missing.

55 tions on the same shallow platform that lack barite layers but have published U-Pb dates that occur i

56 Here, we report 11 barite layers from a post-Marinoan dolostone sequence at

57 These pelagic barites likely precipitate within particle-associated mi

58 Partially extracted barite may have slightly lower delta18O or delta34S valu

59 Contamination resulted from barite mining activities.

60 ted solution with respect to barite, Sr-rich barite nanoparticles formed on organics, while micromete

61 sing the local supersaturation and promoting barite nucleation on organic films, even when the bulk s

62 ndicated that very high predictive zones for barite occurrences accounted for 19% of all the models.

63 rrelation attribute evaluation suggests that barite occurrences displayed a strong correlation with s

64 The peak at +5 per thousand represents barite of different ages and host-rock lithology showing

65 -xRaxSO4 solid solution surface layer on the barite or (2) a complete recrystallization, leading to h

66 could be clearly shown that Ra uptake in all barite particles analyzed within this study is not limit

67 s were systematically integrated to prospect barite potential zones within the Mid-Nigerian Benue Tro

68 In the laboratory, barite precipitated from a solution with a high nitrate/

69 GISAXS), size and total volume evolutions of barite precipitates on organic films were characterized.

70 sms controlling dissolved Ra activity may be barite precipitation and sulfate reduction, along with i

71 ata from Lake Superior that evidence pelagic barite precipitation at micromolar ambient sulfate.

72 However, an understanding of barite precipitation in the ocean, which is globally und

73 Barite precipitation occurs despite the presence of anti

74 s demonstrate a pH dependence in the rate of barite precipitation, which we use to develop a predicti

75 eriments to identify the factors controlling barite precipitation.

76 Carrier (i.e., barite) recycling during water treatment was shown to be

77 Upon acidification, barite reprecipitation from a DTPA solution is quantitat

78 um isotope ratio curve from marine (pelagic) barite reveals distinct features in the evolution of the

79 monstrated that heavily nitrate-contaminated barite samples are free of nitrate occlusion after two d

80 lytical approach was applied on two distinct barite samples from Ra uptake batch experiments using ti

81 be quantified, but the significant amount of barite scale formed by HFFs with reused produced water c

82 e sulfate (delta18O(SO4)) measured in marine barite show variability over the past 10 million years,

83 tion of sulphate from ancient evaporites and barites shows variable negative oxygen-17 isotope anomal

84 in pore-water were lower than predicted from barite solubility estimates but strongly related to exch

85 ed this elemental signature was saturated in barite, sphene, chalcedony, apatite, and clay minerals.

86 ngle supersaturated solution with respect to barite, Sr-rich barite nanoparticles formed on organics,

87 he occurrence of higher Sr content in marine barites than expected for classical crystal growth proce

88 Depending on the type of barite used, an additional coarsening effect or a strong

89 e role of Ra during the recrystallization of barite was examined via detailed SEM investigations.

90 0 per thousand), suggesting that by the time barite was precipitating in the immediate aftermath of a

91 However, the question of how barites were able to precipitate from a contemporary oce

92 to newly formed solids composed mainly of Sr barite within the first approximately 10 h of mixing.