Uranium isotope composition of kimberlites, the enclosing and overburden deposits of the Zolotitskoye ore field

Kiselev, G. P.; Yakovlev, Evgeny; Druzhinin, S. I.; Zykov, Sergey; Bykov, V. M.; Ocheretenko, A.~A.~

doi:10.2205/rjes-data-622

Cited by 2 publications

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“…The results of uranium isotopic studies in the samples of kimberlites, the enclosing and overburden deposits of the Zolotitskoye ore field are published as the dataset by [Kiselev et al, 2018] in the Earth Sciences Database (ESDB) created and managed by the Geophysical Center RAS. In the generalized form, depending on the facial belonging of the rocks, the data is shown in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…Since the discovery of the first kimberlite pipe in the territory of the Arkhangelsk diamondiferous province (ADP) a lot of classical geophysical methods for the prospect of the kimberlite bodies have been published; however, the most ef-fective among all these methods, similar to those in many other diamondiferous provinces all over the world, proved to be the aeromagnetic methods [Cyganov et al, 2004;Kontarovich and Cyganov, 2000]. At the same time, magnetic surveys in the Arkhangelsk province territory nowadays face hard times.…”

Section: Introductionmentioning

confidence: 99%

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Uranium even isotopes in kimberlites, enclosing and overburden rocks of the Zolotitskoye ore field (Arkhangelsk diamondiferous province)

Kiselev¹,

Yakovlev²,

Druzhinin³

et al. 2018

Russ. J. Earth Sci.

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To confirm the presence of geophysical anomaly the isotopic composition of uranium has been studied from the samples extracted from the exploration wells drilled in different years in the territory of the Zolotitskoye ore field of the Arkhangelsk diamondiferous province (ADP). The study was based on the heterochronous deposits of the geologic profile and managed to obtain data on isotopic composition of uranium. For the quaternary deposits and coal formations, which are overburden ones in the Zolotitskoye ore field kimberlites, and in the Vendian rocks, which enclose kimberlites, the average values of isotopic ratio 234 U/ 238 U did not exceed 1. Most samples from the near-contact zone, which are represented by the upper Vendian deposits and by the peripheral part of crater facies of pipes, contained excessive amounts of the daughter isotope 234 U. The generation of high = 234 U/ 238 U values is explained as being related to the geologic structure of the near-contact zone. The particular features of the 234 U isotope distribution are consistent with the tectonic and substantial changes in the rocks within the near-contact zone. This phenomenon has also been evidenced by several other investigators. The generation mode of non-equlibrium uranium with the excessive 234 U content is explained by the dynamics and circulation of underground waters along the tectonic fractures bounding the pipes. The empirical data obtained in the course of the laboratory tests allow to conclude with a certain degree of scepticism that non-equilibrium uranium in enclosing rocks relates to kimberlite magmatism in the ADP territory. In turn, non-equilibrium uranium with the excessive content of 234 U, which was discovered in the geologic profile of enclosing Vendian deposits, may be considered as the local indirect evidence of ADP kimberlite bodies. However, when estimating the prospecting areas for availability of the kimberlite magmatism in the geologic profiles of exploration wells, the non-equilibrium state of uranium should be considered only in conjunction with the kimberlite signs.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Uranium even isotopes in kimberlites, enclosing and overburden rocks of the Zolotitskoye ore field (Arkhangelsk diamondiferous province)

Kiselev¹,

Yakovlev²,

Druzhinin³

et al. 2018

Russ. J. Earth Sci.

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Radon over Kimberlite Pipes: Estimation of the Emanation Properties of Rocks (Lomonosov Diamond Deposit, NW Russia)

Yakovlev

Puchkov

2021

Applied Sciences

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In this paper, using the example of the Lomonosov diamond deposit, experimental studies of rocks were carried out to assess the main radiation and physical factors affecting the formation of the radon field over the kimberlite pipes of the Arkhangelsk diamondiferous province. For various types of rocks, represented by vent kimberlites, tuffaceous-sedimentary rocks of the crater and enclosing and overlying sediments, the following were studied: porosity, density, activity of radium-226, activity of radon in a free state, level of radon production, and emanation coefficient. The research results showed that the greatest amount of radon in a free state is produced by rocks of the near-pipe space, represented by the enclosing Vendian V2 deposits and characterized by high values of the emanation coefficient, radium activity, radon production level and porosity. This fact is associated with the structural and geological features of the near-pipe space, which was exposed to the impact of kimberlite magma on the host rocks. The lowest values of these parameters are characteristic of the kimberlites of the vent facies, which limits the formation of free radon in the body of the pipe. The results of the experimental studies create prospects for the development of emanation methods for searching for kimberlite pipes in the conditions of the Arkhangelsk diamondiferous province.

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Uranium isotope composition of kimberlites, the enclosing and overburden deposits of the Zolotitskoye ore field

Cited by 2 publications

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Uranium even isotopes in kimberlites, enclosing and overburden rocks of the Zolotitskoye ore field (Arkhangelsk diamondiferous province)

Uranium even isotopes in kimberlites, enclosing and overburden rocks of the Zolotitskoye ore field (Arkhangelsk diamondiferous province)

Radon over Kimberlite Pipes: Estimation of the Emanation Properties of Rocks (Lomonosov Diamond Deposit, NW Russia)

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