Barite Dating
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U-Th radioactive disequilibrium and ESR dating of a barite . . .
ESR dating of barite in sulphide deposits formed by the . . .
(PDF) ESR Dating of Barite in Sea-Floor Hydrothermal . . .
The alpha effectiveness of the dating ESR signal in barite . . .
Evidence for Remobilization of Barite Affecting . . .
The alpha effectiveness of the dating ESR signal in barite . . .
The alpha effectiveness of the dating ESR signal in barite . . .
PDF Barite - USGS
Barite in Drilling Mud Application, Properties & formula . . .
PDF Weight-Up Calculation with Barite
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We followed the methods for the dating described in Okumura et al . (2010) . Different powder aliquots separated from the same chips used for the U-Th disequilibrium dating were used for the ESR dating . Barite was separated from the sulfide minerals in the chip by leaching with 12M HCl and 13M HNO 3 acid, sequentially . After rinsing with . . .
As the Ra in barite is the only source of the radiation that creates the dating signal (SO 3 −) in barite , internal alpha dose rate is a major part of the total dose rate such as 60 % . Alpha particles have high linear energy transfer, which makes higher concentration of electron-hole pairs along the path, hence resulting in higher rate of . . .
Barite (BaSO 4 ) is a mineral recently found to be practically useful for ESR dating (Okumura et al ., 2010;Takamasa et al ., 2013; Fujiwara et al ., 2015), especially for those occurring in . . .
1 . Introduction . While Kasuya et al . (1991) first pointed out that ESR (electron spin resonance) dating of barite (BaSO 4) is possible, the method was first practically applied by Okumura et al . (2010) to a sample formed by the submarine hydrothermal activity . A subsequent study by Sato et al . (2011) studied the thermal stability of the signal and concluded that the dating signal due to SO 3 . . .
In each case, the radiometric dating relied on the radium isotopes 228 Ra and 226 Ra with half-lives of 5 .75 and 1,600 years, respectively, which coprecipitate with barite and then decay . We began dating VMS mineralization 15 years ago, knowing that the 226 Ra/Ba decreases with time, with the Ba and Ra assumed to be from a common source such . . .
Following Okumura et al . (2010), who made the first practical application of ESR dating to a sample of seafloor hydrothermal barite with the signal due to SO 3 -, basic studies on ESR dating of . . .
The alpha effectiveness was investigated for an ESR signal due to SO 3-in barite by comparing the dose responses of the signal for gamma irradiation and for He ion implantation with an energy of 4 MeV . The value was obtained to be 0 .043 ± 0 .018 for samples from Morocco and to be 0 .0089 ± 0 .0006 for Kanehira Mine .
Barite also is used as a filler, extender, or weighting agent in products such as paints, plastics, and rubber . Some specific applications include use in automobile brake and clutch pads, automobile paint primer for metal protection . . . Barite Created Date:
Barite physically is not soluble in water and does not cause any chemical reactions with other drilling mud chemicals . In general, barite is used for raising the density of water-based mud and oil-based drilling fluids up to 22 ppg (2 .64 sg) . Barite is also used for weighting up kill fluids, and in the Barite lock plug formulation .
Lbs . of Barite Required (B) × ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ × − = Where: B = Amount of Barite to Add, lbs . V I = Starting Volume of Mud, gallons W f = Desired Mud Weight, lb/gal W I = Starting Mud Weight, lb/gal Rule of Thumb: For Weighted Drilling Fluids up to 12 lbs ./gal using Barite . For every 140 pounds of Barite added to 100 gallons . . .
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Barite Dating
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