Boron occurrence in halite and boron isotope geochemistry of halite in the Qarhan Salt Lake, western China

Fan, Qicheng; Ma, Yunqi; Cheng, Huaide; Wei, Haicheng; Qin, Yuan; Qin, Z. H.; Feng, Shaomin

doi:10.1016/j.sedgeo.2015.03.012

Cited by 43 publications

(23 citation statements)

References 42 publications

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“…It is a relatively lighter element with an atomic number of five, and it has two stable isotopes; the abundances of 10 B and 11 B are 19.82% and 80.18%, respectively [18]. B and its isotopes are good tracers of the mass transfer processes in terrestrial systems [19][20][21][22][23].…”

Section: -97mentioning

confidence: 99%

Origin of Boron and Brine Evolution in Saline Springs in the Nangqen Basin, Southern Tibetan Plateau

Han

Hussain

et al. 2018

Geofluids

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The Nangqen Basin is a typical shearing-extensional basin situated in the hinterland of the Tibetan Plateau. It contains abundant saline spring resources and abnormal trace element enrichments. The hydrochemical molar ratios (Na/Cl, B/Cl, and Br/Cl), H-O isotopes, and B isotopes of the saline spring were systematically measured to describe the evolution of brines and the origin of the boron. The sodium chloride coefficient of the water samples in this area is around 1.0 or slightly greater, which is characteristic of leached brines; the highest B/Cl value is 4.25 (greater than that of seawater). The Na/Cl, B/Cl, and Br/Cl values of the springs are clear indicators of a crustal origin. The18 O values of the spring waters range from −12.88‰ to −16.05‰, and the D values range from −100.91‰ to −132.98‰. Meanwhile the B content and B isotopes in the saline springs are in the ranges of 1.00 to 575.56 ppm and +3.55‰ to +29.59‰, respectively. It has been proven that the saline springs in the Nangqen Basin are a type of leached brine, suggesting that the saline springs have a terrestrial origin. The 11 B-B characteristics of the springs are similar to those observed in the Tibetan geothermal area, indicating that these two places have the same B source. Moreover, they have a crustal origin (marine carbonate rocks and volcanic rocks) instead of a deep mantle source.

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Section: -97mentioning

confidence: 99%

Origin of Boron and Brine Evolution in Saline Springs in the Nangqen Basin, Southern Tibetan Plateau

Han

Hussain

et al. 2018

Geofluids

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“…This consistent variation in 11 B/ 10 B provides strong evidence for a stable depositional environment during the formation of the evaporate sequence in the entire halite L 1 sequence. Boron within halite occurs as fluid inclusions (Fan et al, 2015); therefore, boron's isotopic ratios are almost the same as the δ 11 B values of paleo-brines from which the halite precipitated. As Cretaceous seawater had a δ 11 B value of 40‰ (Fig.…”

Section: Boron Isotope Compositionmentioning

confidence: 96%

A Multi–fluid Constrain for the Forming of Potash Deposits in the Savannakhet Basin: Geochemical Evidence from Halite

Ren

Gao

et al. 2018

Acta Geologica Sinica (Eng)

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The Khorat Plateau on the Indochina Terrane is known to have formed during the closure of the Tethys Ocean, although the origin of its potash mineral deposits is a topic of current debate. Data from a borehole on Savannakhet Basin is used in this study to re‐define the evaporation processes of the study area. Geochemical analyses of halite from various borehole‐derived evaporite strata have elucidated the fluid sources from which these ores formed. Measured δ11B indicated that ore deposits formed primarily due to evaporation of seawater, although non‐marine fluids affected the later stages of the evaporation process. Fluctuations in B and Br concentrations in carnallite‐ and sylvite‐rich strata indicate the influence of fresh water. Boron concentration in carnallite unit indicated the influence of hydrothermal fluids. From the relative timings of these various fluid influxes, the evolution of these evaporates can be divided into four stages: (1) an initial marine evaporation at the beginning of the deposit's formation, where seawater (and minor fresh water) trapped on the uplifted Khorat Plateau produced sediments and salts with Br contents lower than those of normal marine‐derived evaporites; (2) a transgression stage, where seawater recharged the basin; (3) a hydrothermal infiltration stage, which was coeval with the late Yanshan movement; and (4) a stage of fresh water supply, as recorded by fluctuations in B and Br contents, inferring intermittent fresh water influx into the basin. Thus, although evaporites on the Savannakhet Basin primarily formed via marine evaporation, they were also influenced to a significant degree by the addition of non–marine fresh water and hydrothermal fluids.

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“…Boron separation and isotopic ratio measurements were performed at the Qinghai Institute of Salt Lakes, Chinese Academy of Sciences. The analysis of B isotopic compositions and chemical separation of B followed the procedure described elsewhere (Fan et al, 2015;He et al, 2013;Wei et al, 2014). Boron was isolated from solution sample via a two-column ion-exchange procedure.…”

Section: Methodsmentioning

confidence: 99%

Geochemical Constraints on the Origin and Evolution of Spring Waters in the Changdu‐Lanping‐Simao Basin, Southwestern China

Qin

Zhang

et al. 2019

Acta Geologica Sinica (Eng)

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Chemical and isotopic data were measured for 51 leached brine springs in the Changdu‐Lanping‐Simao Basin (CD‐LP‐SM), China. The predominance of Cl and Na, saturation indices of carbonate minerals, and Na/Cl and Ca/SO4 ratios of ∼1 suggest that halite, sulphate, and carbonate are the solute sources. Integration of geochemical, δ18O, and δD values suggests that springs are mainly derived from meteoric water, ice‐snow melt, and water‐rock interactions. B concentrations range from 0.18 to 11.9 mg/L, with δ11B values of –4.37‰ to +32.39‰, indicating a terrestrial source. The δ11B‐B relationships suggest B sources of crustal origin (marine carbonates with minor crust‐derived volcanics); we did not identify a marine or deep mantle origin. The δ11B values of saline springs (+4.61‰ to +32.39‰) exceed those of hot (–4.37‰ to +4.53‰) and cold (–3.47‰ to +14.84‰) springs; this has contributed to strong water‐rock interactions and strong saturation of dissolved carbonates. Conversely, the global geothermal δ11B‐Cl/B relationship suggests mixing of marine and non‐marine sources. The δ11B‐Cl/B relationships of the CD‐LP‐SM are similar to those of the Tibet geothermal belt and the Nangqen Basin, indicating the same B origin. These differ from thermal waters controlled by magmatic fluids and seawater, suggesting that B in CD‐LP‐SM springs has a crustal origin.

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Boron occurrence in halite and boron isotope geochemistry of halite in the Qarhan Salt Lake, western China

Cited by 43 publications

References 42 publications

Origin of Boron and Brine Evolution in Saline Springs in the Nangqen Basin, Southern Tibetan Plateau

Origin of Boron and Brine Evolution in Saline Springs in the Nangqen Basin, Southern Tibetan Plateau

A Multi–fluid Constrain for the Forming of Potash Deposits in the Savannakhet Basin: Geochemical Evidence from Halite

Geochemical Constraints on the Origin and Evolution of Spring Waters in the Changdu‐Lanping‐Simao Basin, Southwestern China

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