Biotite in a Paleozoic metagreywacke complex, Mecsek Mountains, Hungary: conditions of low-T metamorphism deduced from illite and chlorite crystallinity, coal rank, white mica geobarometric and microstructural data

P. Árkai, C. Lantai, G. Nagy, G. Lelkes-Felvari

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9 Citations (Scopus)

Abstract

The borehole Szalatnak-3 penetrates a Silurian metagreywacke complex. Microstructural observations prove that regional (dynamothermal) metamorphism was overprinted by a contact (thermal) event. The application of the illite-crystallinity (IC) method for determining metamorphic zones of the metagreywacke samples, which contain di- and trioctahedral mica phases in strongly varying proportions, gave misleading results. In contrast, chlorite crystallinity (ChC) indicates transitional 'anchi-/epizonal' metamorphism. ChC data fit fairly well with conclusions obtained from chlorite geothermometric and coal rank data. Based on its post-tectonic (partly fissure filling) nature, the formation of biotite is attributed to the contact metamorphic heat effect and/or to an eventual infiltration metasomatism connected to the intrusion of syenite.

Original languageEnglish
Pages (from-to)293-318
Number of pages26
JournalActa Geologica Hungarica
Volume38
Issue number4
Publication statusPublished - 1995

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metagreywacke
coal rank
crystallinity
mica
illite
chlorite
biotite
metamorphism
Paleozoic
mountain
syenite
regional metamorphism
metasomatism
fissure
Silurian
infiltration
borehole
tectonics

ASJC Scopus subject areas

  • Geology

Cite this

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title = "Biotite in a Paleozoic metagreywacke complex, Mecsek Mountains, Hungary: conditions of low-T metamorphism deduced from illite and chlorite crystallinity, coal rank, white mica geobarometric and microstructural data",
abstract = "The borehole Szalatnak-3 penetrates a Silurian metagreywacke complex. Microstructural observations prove that regional (dynamothermal) metamorphism was overprinted by a contact (thermal) event. The application of the illite-crystallinity (IC) method for determining metamorphic zones of the metagreywacke samples, which contain di- and trioctahedral mica phases in strongly varying proportions, gave misleading results. In contrast, chlorite crystallinity (ChC) indicates transitional 'anchi-/epizonal' metamorphism. ChC data fit fairly well with conclusions obtained from chlorite geothermometric and coal rank data. Based on its post-tectonic (partly fissure filling) nature, the formation of biotite is attributed to the contact metamorphic heat effect and/or to an eventual infiltration metasomatism connected to the intrusion of syenite.",
author = "P. {\'A}rkai and C. Lantai and G. Nagy and G. Lelkes-Felvari",
year = "1995",
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T1 - Biotite in a Paleozoic metagreywacke complex, Mecsek Mountains, Hungary

T2 - conditions of low-T metamorphism deduced from illite and chlorite crystallinity, coal rank, white mica geobarometric and microstructural data

AU - Árkai, P.

AU - Lantai, C.

AU - Nagy, G.

AU - Lelkes-Felvari, G.

PY - 1995

Y1 - 1995

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AB - The borehole Szalatnak-3 penetrates a Silurian metagreywacke complex. Microstructural observations prove that regional (dynamothermal) metamorphism was overprinted by a contact (thermal) event. The application of the illite-crystallinity (IC) method for determining metamorphic zones of the metagreywacke samples, which contain di- and trioctahedral mica phases in strongly varying proportions, gave misleading results. In contrast, chlorite crystallinity (ChC) indicates transitional 'anchi-/epizonal' metamorphism. ChC data fit fairly well with conclusions obtained from chlorite geothermometric and coal rank data. Based on its post-tectonic (partly fissure filling) nature, the formation of biotite is attributed to the contact metamorphic heat effect and/or to an eventual infiltration metasomatism connected to the intrusion of syenite.

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