K/Ar age of manganese oxide ores of Urkut, Hungary

Ar retention in K-bearing Mn minerals

G. Grasselly, K. Balogh, M. Toth, M. Polgari

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The black shale-hosted Mn-carbonate deposits of Urkut (Bakony Mts., Hungary) are Toarcian in age. Subsequent to burial, during the Late Cimmerian orogeny, erosion nearly uncovered the bedded Mn-carbonate ores where they were oxidized, thereby forming laminated noduliferous Mn-oxides ores with a clay mineral-bearing ferruginous crust. The clay mineral-bearing samples of the primary Mn-carbonate deposit yielded scattered K/Ar apparent ages of 293 to 110 Ma, indicating that associated detrital minerals partly retained radiogenic 40Ar during transportation, deposition, and diagenetic changes. In contrast, more than half of the Mn-oxide ores gave K/Ar ages of 105 to 91 Ma. It has been shown by comparing the Ar retention of Mn-oxide ores and the clay mineral rich host rock that the uniform K/Ar ages of the Mn-oxide ores correspond to the real ages of oxidation, which occurred during the Austrian and Subhercynian phases of the Alpine orogeny. -from Authors

Original languageEnglish
Pages (from-to)365-373
Number of pages9
JournalGeologica Carpathica
Volume45
Issue number6
Publication statusPublished - 1994

Fingerprint

manganese oxide
oxide
mineral
clay mineral
carbonate
Cimmerian
Alpine orogeny
Toarcian
black shale
orogeny
host rock
ore
crust
erosion
oxidation

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

K/Ar age of manganese oxide ores of Urkut, Hungary : Ar retention in K-bearing Mn minerals. / Grasselly, G.; Balogh, K.; Toth, M.; Polgari, M.

In: Geologica Carpathica, Vol. 45, No. 6, 1994, p. 365-373.

Research output: Contribution to journalArticle

Grasselly, G. ; Balogh, K. ; Toth, M. ; Polgari, M. / K/Ar age of manganese oxide ores of Urkut, Hungary : Ar retention in K-bearing Mn minerals. In: Geologica Carpathica. 1994 ; Vol. 45, No. 6. pp. 365-373.
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