Origin of the late Cretaceous potash-bearing evaporites in the Vientiane Basin of Laos: δ11B evidence from borates

Zhang, Xiying; Ma, Hao; Ma, Yunqi; Tang, Qisheng; Yuan, Xiaolong

doi:10.1016/j.jseaes.2012.11.036

Cited by 34 publications

(20 citation statements)

References 25 publications

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“…The calculated δ 11 B value in the halite L 1 column increased with depth up to 260 m, after which it decreased. Zhang et al (2013), reported that the δ 11 B value of borate (table 1, FJ14-FJ11) in Khorat Plateau had similar variations as compared with this study. Hence, the decreased δ 11 B upper than 260 m is not an accidental phenomenon.…”

Section: Boron Isotope Compositionsupporting

confidence: 84%

“…Fresh water contains only small amounts of B, while hydrothermal water has a high B content (Yuan et al, 2014); consequently, the Savannakhet Basin was likely influenced by hydrothermal activity during this evaporiteforming stage. The δ 11 B values reported by Zhang (2013) were found to increase suddenly at two locations (table 1, FJ01 and FJ01). Because hydrothermal water commonly has a low pH (<6), and a high δ 11 B value, the input of hydrothermal water could explain the variation of δ 11 B values at these two points.…”

Section: Variation Of B In Halitementioning

confidence: 87%

“…The sudden increased in δ 11 B value reported by Zhang (2013) also indicated hydrothermal fluid input. Boracite and hilgardites reported in the Vientiane Basin indicate the abnormally high B content of the host water (Zhang et al, 2013). Tachyhydrites and saddle dolomites documented within the Khorat Plateau by El Tabakh(1999;2003), both of which form at high temperatures (>35℃; Huang Keke et al, 2016;Yang et al, 2016), provide evidence for a thermal event during the Cretaceous.…”

Section: The Influence Of Non-marine Resourcesmentioning

confidence: 99%

“…A three-stage model for describing an ore-forming fluid's evolution (based on a multiple-source theory) was introduced by Zhang Xiying et al (2015), which incorporated the influence of brine on diagenetic processes. While extensive research (Zhang et al, 2013;Saminpanya et al, 2014;Zhang Hua et al, 2015) has confirmed the veracity of multiple-source theory in explaining the origin of potash deposits, considerable difficulty remains in discriminating between terrigenous-sourced and deep hydrothermal-sourced ore-forming fluids.…”

mentioning

confidence: 99%

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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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Section: Boron Isotope Compositionsupporting

confidence: 84%

Section: Variation Of B In Halitementioning

confidence: 87%

Section: The Influence Of Non-marine Resourcesmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

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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show abstract

“…Brines from which the evaporites have formed in the Khorat Basin are indicative of marine origin Zhang et al, 2013Zhang et al, , 2014. The Br contents in Simao halite are about 500 ppm (Gao et al, 2013), which is similar to the content in the Khorat basin , indicate a marine origin.…”

Section: Implication For the Age Of Incursion Of The Neo-tethyan Oceanmentioning

confidence: 99%

First SHRIMP U–Pb zircon ages of the potash-bearing Mengyejing Formation, Simao Basin, southwestern Yunnan, China

Wang

Liu

Fei

et al. 2015

Cretaceous Research

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Potash Resources: Occurrences and Controls

Warren

2016

Evaporites

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Origin of the late Cretaceous potash-bearing evaporites in the Vientiane Basin of Laos: δ11B evidence from borates

Cited by 34 publications

References 25 publications

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

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

First SHRIMP U–Pb zircon ages of the potash-bearing Mengyejing Formation, Simao Basin, southwestern Yunnan, China

Potash Resources: Occurrences and Controls

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