Distribution of radioactive isotopes in rock and ore of Arkhangelskaya pipe from the Arkhangelsk diamond province

Kiselev, G. P.; Yakovlev, Evgeny; Druzhinin, S. I.; Galkin, Alexander

doi:10.1134/s1075701517050014

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Alternatively, anomalous isotopic composition and high concentrations of natural elements relative to background values have been reported at Arkhangelskaya kimberlite pipe (Kiselev et al 2017;Yakovlev 2020). In this case, geological and structural features of kimberlite pipe may have worked as a geochemical barrier, such that radioisotopes carried out by groundwater may have been deposited at kimberlite/host rocks contact zones, yielding a halo of high radiometric concentrations (Yakovlev 2020).…”

Section: Discussionmentioning

confidence: 99%

Inference of minerals at Redondão kimberlite crater, Parnaíba Basin, Brazil, based on interpretation of airborne gamma-ray spectrometry and ASTER data

Silva

2024

JGSB

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This work reports how minerals at Redondão kimberlite pipe may be inferred through the integrated interpretation of airborne gamma-ray spectrometry data and multispectral images derived from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). Using several processing techniques (e.g., K, eTh, and eU concentration maps; K/eTh, K/eU, and eU/eTh ratio maps; K image inverse map; profile analysis for radiometric data; and spectral indexes and mineral distribution and abundance maps for ASTER data), it was observed that K concentrations within Redondão kimberlite intrusion are high enough to be distinct from the surroundings and at least three spectral signatures of endmembers extracted from ASTER images suggest that chlorite, diopside, and phlogopite minerals may be present within Redondão kimberlite crater and the near surroundings. Although the sources of K concentrations are unclear, they are probably composed of different minerals, including phlogopite. The spectral signatures of chlorite, diopside, phlogopite may be derived from clastic materials and products derived from weathered ultramafic mineral, but new studies are recommended to improve the distribution and abundance maps of these minerals. These new studies may include hyperspectral sensor images and rock-spectra data. The results reported here will be useful for further research whose goal is to map kimberlites using remotely sensed images not only in the study area, but also in other locations with similar geologic context.

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Section: Discussionmentioning

confidence: 99%

Inference of minerals at Redondão kimberlite crater, Parnaíba Basin, Brazil, based on interpretation of airborne gamma-ray spectrometry and ASTER data

Silva

2024

JGSB

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“…The Vendian rocks are characterized by elevated or anomalous U, Th and K contents concerning the background values. This halo of non-equilibrium uranium is localized in the near-pipe space and revealed in Vendian aquifer system rocks consisting of siltstone and sandstone and rocks of the epiclastic unit in the pipe at the contact with host rocks [77]. The authors explained the deviation of the isotopic equilibrium of uranium by the dynamics and long-term circulation of underground water along the tectonic fractures bounding the pipes.…”

Section: A New Reality For Talik System Existence By 234 U/ 238 U Act...mentioning

confidence: 98%

Interpretation of the anomalous groundwater chemistry and ²³⁴U/²³⁸U activity ratio disequilibrium in the northern part of the baltic region

Mokrik¹,

Samalavičius²

2022

physics

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The anomalous isotope-hydrogeochemistry phenomena in the groundwater of Estonian Cambrian-Vendian (Ediacaran) and Ordovician-Cambrian aquifer systems were formed in the Late-Middle Pleistocene. In the periglacial environment, in northern and northwestern Estonia, these aquifer systems with fracture porose crystalline basement are connected to hydraulically joint unit characterized by high radioactivity groundwater. A significant alteration of groundwater occurred by series of isotope and chemistry facies fractionation. In this study, uranium isotopes activity ratio (234U/238U), 4He content, isotope-hydrogeochemistry and adjusted 14C ages are coupled for a new prospect of the estimation of northern Baltic Basin groundwater evolution. Analyzing radiocarbon and 4He groundwater residence time results and uranium isotope activity ratio distribution suggests a prolonged periglacial environment in which groundwater evolved. Stable isotope ratios of δ18O and δ2H correlation and hydrochemical composition changes support the cryogenic origin of groundwater. Pleistocene glaciations cyclically affect groundwater in multiple ways: permafrost isotope-geochemistry partitioning; periodically changing reversed flow directions of recharge and discharge areas; oscillations of the sea, river system, and periglacial lakes level, surface and sub-permafrost water mixing via taliks and fractured basement rocks. These processes lead to forming the sequence of isotope-hydrogeochemistry types and specific zoning; in general, two separate groundwater fractions – brackish in the lower part and freshened above. An extensive groundwater exploitation on the northern coast sites influenced a sharp dysfunction in the groundwater body, destabilizing the natural equilibrium state formed in the Holocene and Pleistocene.

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Distribution of radioactive isotopes in rock and ore of Arkhangelskaya pipe from the Arkhangelsk diamond province

Cited by 2 publications

References 11 publications

Inference of minerals at Redondão kimberlite crater, Parnaíba Basin, Brazil, based on interpretation of airborne gamma-ray spectrometry and ASTER data

Inference of minerals at Redondão kimberlite crater, Parnaíba Basin, Brazil, based on interpretation of airborne gamma-ray spectrometry and ASTER data

Interpretation of the anomalous groundwater chemistry and ²³⁴U/²³⁸U activity ratio disequilibrium in the northern part of the baltic region

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Distribution of radioactive isotopes in rock and ore of Arkhangelskaya pipe from the Arkhangelsk diamond province

Cited by 2 publications

References 11 publications

Inference of minerals at Redondão kimberlite crater, Parnaíba Basin, Brazil, based on interpretation of airborne gamma-ray spectrometry and ASTER data

Inference of minerals at Redondão kimberlite crater, Parnaíba Basin, Brazil, based on interpretation of airborne gamma-ray spectrometry and ASTER data

Interpretation of the anomalous groundwater chemistry and 234U/238U activity ratio disequilibrium in the northern part of the baltic region

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Interpretation of the anomalous groundwater chemistry and ²³⁴U/²³⁸U activity ratio disequilibrium in the northern part of the baltic region