Composition, diagenetic and post-diagenetic alterations of a possible radioactive waste repository site: The Boda Albitic claystone formation, southern Hungary

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Abstract

In southern Hungary a thick Upper Permian claystone formation has been selected as a possible repository of high-level nuclear waste. Detailed petrographic and geochemical characterizations of the formation are given, using the results of microscopic observations, X-ray diffractometric modal and phyllosilicate crystallinity, X-ray fluorescence major element bulk chemical, K-Ar isotope geochronologic and stable C, O and H isotope ratio analyses. On the basis of peculiar bulk chemistries and modal compositions characterized by extremely high, authigenic albite, low quartz, high hematite and moderate carbonate contents, the formation is considered to have been deposited in a shallow-water lacustrine environment, under semi-arid to arid climatic conditions and highly alkaline, strongly oxidative hydrological ones. Illite and chlorite crystallinity as well as vitrinite reflectance data point to late or deep diagenesis (max. 200-250 °C) that - according to the K-Ar ages of the 13C and variable δ18O values suggest pervasive diagenesis. Ubiquitous fracture fillings are grouped into calcite-, baryte+quartz- and anhydrite-dominated veins, the barytic one with traces of sulfidic mineralizations. The combined H-C-O isotopic study of fissure-filling carbonates and fluid inclusions suggests three fluid generations acting in fractures, namely: magmatic fluid and meteoric waters related to warm and cold climates, respectively. A significant effect of recent meteoric water in fracture fillings is unlikely.

Original languageEnglish
Pages (from-to)351-378
Number of pages28
JournalActa Geologica Hungarica
Volume43
Issue number4
Publication statusPublished - 2000

Fingerprint

claystone
repository
radioactive waste
crystallinity
meteoric water
diagenesis
isotope
quartz
carbonate
fluid
lacustrine environment
vitrinite reflectance
phyllosilicate
anhydrite
albite
X-ray fluorescence
fissure
illite
hematite
fluid inclusion

Keywords

  • Chlorite crystallinity
  • Diagenesis
  • Fracture fillings
  • Hungary
  • Illite crystallinity
  • K-Ar dating
  • Modal composition
  • Permian claystone
  • Radioactive waste repository
  • Stable isotope geochemistry

ASJC Scopus subject areas

  • Geology

Cite this

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title = "Composition, diagenetic and post-diagenetic alterations of a possible radioactive waste repository site: The Boda Albitic claystone formation, southern Hungary",
abstract = "In southern Hungary a thick Upper Permian claystone formation has been selected as a possible repository of high-level nuclear waste. Detailed petrographic and geochemical characterizations of the formation are given, using the results of microscopic observations, X-ray diffractometric modal and phyllosilicate crystallinity, X-ray fluorescence major element bulk chemical, K-Ar isotope geochronologic and stable C, O and H isotope ratio analyses. On the basis of peculiar bulk chemistries and modal compositions characterized by extremely high, authigenic albite, low quartz, high hematite and moderate carbonate contents, the formation is considered to have been deposited in a shallow-water lacustrine environment, under semi-arid to arid climatic conditions and highly alkaline, strongly oxidative hydrological ones. Illite and chlorite crystallinity as well as vitrinite reflectance data point to late or deep diagenesis (max. 200-250 °C) that - according to the K-Ar ages of the 13C and variable δ18O values suggest pervasive diagenesis. Ubiquitous fracture fillings are grouped into calcite-, baryte+quartz- and anhydrite-dominated veins, the barytic one with traces of sulfidic mineralizations. The combined H-C-O isotopic study of fissure-filling carbonates and fluid inclusions suggests three fluid generations acting in fractures, namely: magmatic fluid and meteoric waters related to warm and cold climates, respectively. A significant effect of recent meteoric water in fracture fillings is unlikely.",
keywords = "Chlorite crystallinity, Diagenesis, Fracture fillings, Hungary, Illite crystallinity, K-Ar dating, Modal composition, Permian claystone, Radioactive waste repository, Stable isotope geochemistry",
author = "P. {\'A}rkai and A. Dem{\'e}ny and I. F{\'o}rizs and G. Nagy and K. Balogh and Z. Mt́h{\'e}",
year = "2000",
language = "English",
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pages = "351--378",
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T1 - Composition, diagenetic and post-diagenetic alterations of a possible radioactive waste repository site

T2 - The Boda Albitic claystone formation, southern Hungary

AU - Árkai, P.

AU - Demény, A.

AU - Fórizs, I.

AU - Nagy, G.

AU - Balogh, K.

AU - Mt́hé, Z.

PY - 2000

Y1 - 2000

N2 - In southern Hungary a thick Upper Permian claystone formation has been selected as a possible repository of high-level nuclear waste. Detailed petrographic and geochemical characterizations of the formation are given, using the results of microscopic observations, X-ray diffractometric modal and phyllosilicate crystallinity, X-ray fluorescence major element bulk chemical, K-Ar isotope geochronologic and stable C, O and H isotope ratio analyses. On the basis of peculiar bulk chemistries and modal compositions characterized by extremely high, authigenic albite, low quartz, high hematite and moderate carbonate contents, the formation is considered to have been deposited in a shallow-water lacustrine environment, under semi-arid to arid climatic conditions and highly alkaline, strongly oxidative hydrological ones. Illite and chlorite crystallinity as well as vitrinite reflectance data point to late or deep diagenesis (max. 200-250 °C) that - according to the K-Ar ages of the 13C and variable δ18O values suggest pervasive diagenesis. Ubiquitous fracture fillings are grouped into calcite-, baryte+quartz- and anhydrite-dominated veins, the barytic one with traces of sulfidic mineralizations. The combined H-C-O isotopic study of fissure-filling carbonates and fluid inclusions suggests three fluid generations acting in fractures, namely: magmatic fluid and meteoric waters related to warm and cold climates, respectively. A significant effect of recent meteoric water in fracture fillings is unlikely.

AB - In southern Hungary a thick Upper Permian claystone formation has been selected as a possible repository of high-level nuclear waste. Detailed petrographic and geochemical characterizations of the formation are given, using the results of microscopic observations, X-ray diffractometric modal and phyllosilicate crystallinity, X-ray fluorescence major element bulk chemical, K-Ar isotope geochronologic and stable C, O and H isotope ratio analyses. On the basis of peculiar bulk chemistries and modal compositions characterized by extremely high, authigenic albite, low quartz, high hematite and moderate carbonate contents, the formation is considered to have been deposited in a shallow-water lacustrine environment, under semi-arid to arid climatic conditions and highly alkaline, strongly oxidative hydrological ones. Illite and chlorite crystallinity as well as vitrinite reflectance data point to late or deep diagenesis (max. 200-250 °C) that - according to the K-Ar ages of the 13C and variable δ18O values suggest pervasive diagenesis. Ubiquitous fracture fillings are grouped into calcite-, baryte+quartz- and anhydrite-dominated veins, the barytic one with traces of sulfidic mineralizations. The combined H-C-O isotopic study of fissure-filling carbonates and fluid inclusions suggests three fluid generations acting in fractures, namely: magmatic fluid and meteoric waters related to warm and cold climates, respectively. A significant effect of recent meteoric water in fracture fillings is unlikely.

KW - Chlorite crystallinity

KW - Diagenesis

KW - Fracture fillings

KW - Hungary

KW - Illite crystallinity

KW - K-Ar dating

KW - Modal composition

KW - Permian claystone

KW - Radioactive waste repository

KW - Stable isotope geochemistry

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VL - 43

SP - 351

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JO - Central European Geology

JF - Central European Geology

SN - 1788-2281

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