Crystallization conditions of pegmatites from the Velence Mts, western Hungary, on the basis of thermobarometric studies

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Abstract

The pegmatite nest and myarolitic cavities occurring in the Variscan (280 Ma.) biotitic monzogranite of the Velence Mts are characterized by simple mineralogy (K-feldspar, plagioclase, quartz, mica). Fluid inclusion studies carried out on quartz revealed that the pegmatites were formed from high temperature, relatively dilute solutions. The parent solutions had a NaCl-CaCl2-H2O-type composition with variable Na/Ca atomic proportions. The combination of two-feldspar thermometry and fluid inclusion data indicates that the pegmatites were formed in two temperature ranges, between 500 and 600°C and 300 to 400°C, at about 2 kbars pressure. Studies of secondary fluid inclusions also yield data about the character of post-pegmatite, more saline hydrothermal fluids. The occurrence of very dilute, boiling fluids related to Eocene volcanic activity was also detected in the quartz crystals of pegmatites, and the data suggest that the depth of the granite intrusion was about 1700-1900 m at the time of that igneous activity. -from Authors

Original languageEnglish
Pages (from-to)57-80
Number of pages24
JournalActa Geologica Hungarica
Volume38
Issue number1
Publication statusPublished - 1995

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fluid inclusion
crystallization
pegmatite
quartz
feldspar
hydrothermal fluid
Hercynian orogeny
mica
plagioclase
nest
cavity
Eocene
mineralogy
granite
crystal
fluid
temperature
thermometry

ASJC Scopus subject areas

  • Geology

Cite this

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title = "Crystallization conditions of pegmatites from the Velence Mts, western Hungary, on the basis of thermobarometric studies",
abstract = "The pegmatite nest and myarolitic cavities occurring in the Variscan (280 Ma.) biotitic monzogranite of the Velence Mts are characterized by simple mineralogy (K-feldspar, plagioclase, quartz, mica). Fluid inclusion studies carried out on quartz revealed that the pegmatites were formed from high temperature, relatively dilute solutions. The parent solutions had a NaCl-CaCl2-H2O-type composition with variable Na/Ca atomic proportions. The combination of two-feldspar thermometry and fluid inclusion data indicates that the pegmatites were formed in two temperature ranges, between 500 and 600°C and 300 to 400°C, at about 2 kbars pressure. Studies of secondary fluid inclusions also yield data about the character of post-pegmatite, more saline hydrothermal fluids. The occurrence of very dilute, boiling fluids related to Eocene volcanic activity was also detected in the quartz crystals of pegmatites, and the data suggest that the depth of the granite intrusion was about 1700-1900 m at the time of that igneous activity. -from Authors",
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T1 - Crystallization conditions of pegmatites from the Velence Mts, western Hungary, on the basis of thermobarometric studies

AU - Molnár, F.

AU - Török, K.

AU - Jones, P.

PY - 1995

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N2 - The pegmatite nest and myarolitic cavities occurring in the Variscan (280 Ma.) biotitic monzogranite of the Velence Mts are characterized by simple mineralogy (K-feldspar, plagioclase, quartz, mica). Fluid inclusion studies carried out on quartz revealed that the pegmatites were formed from high temperature, relatively dilute solutions. The parent solutions had a NaCl-CaCl2-H2O-type composition with variable Na/Ca atomic proportions. The combination of two-feldspar thermometry and fluid inclusion data indicates that the pegmatites were formed in two temperature ranges, between 500 and 600°C and 300 to 400°C, at about 2 kbars pressure. Studies of secondary fluid inclusions also yield data about the character of post-pegmatite, more saline hydrothermal fluids. The occurrence of very dilute, boiling fluids related to Eocene volcanic activity was also detected in the quartz crystals of pegmatites, and the data suggest that the depth of the granite intrusion was about 1700-1900 m at the time of that igneous activity. -from Authors

AB - The pegmatite nest and myarolitic cavities occurring in the Variscan (280 Ma.) biotitic monzogranite of the Velence Mts are characterized by simple mineralogy (K-feldspar, plagioclase, quartz, mica). Fluid inclusion studies carried out on quartz revealed that the pegmatites were formed from high temperature, relatively dilute solutions. The parent solutions had a NaCl-CaCl2-H2O-type composition with variable Na/Ca atomic proportions. The combination of two-feldspar thermometry and fluid inclusion data indicates that the pegmatites were formed in two temperature ranges, between 500 and 600°C and 300 to 400°C, at about 2 kbars pressure. Studies of secondary fluid inclusions also yield data about the character of post-pegmatite, more saline hydrothermal fluids. The occurrence of very dilute, boiling fluids related to Eocene volcanic activity was also detected in the quartz crystals of pegmatites, and the data suggest that the depth of the granite intrusion was about 1700-1900 m at the time of that igneous activity. -from Authors

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