1. Meeting of Young Geoscientists
Remnants of past percolation flow events entrapped in lateral secretion quartz lenses of the Ófalu Complex
Tóth Ferenc
Earth Science MSc II.
SZTE, Department of Mineralogy, Geochemistry and Petrology
Meeting of Young Geoscientists
Tatabánya, 2012

2. The aim of the study ? ? Mórágy Complex paleohydrology research
Advective fluid flow
Diffusional fluid flow
Vein-filling minerals - calcite and quartz
Fluid Inclusion Plane (FIP) rock-bearing quartz ?
Fluids from Ófalu Complex
primary, vein-filling calcite fluid inclusions ?
FIPs from Ófalu Complex, rock-bearing lateral secretion quartz (diffusive fluid flow events)

3. Geological overview of Mecsekalja-shear zone

4. Data comparison with Mórágy Complex fluids
Applied methods
1. Texture
Enclosing mineral
Intracrystalline deformation
Degree of recrystallization
Data comparison with Mórágy Complex fluids
Inclusion petrography
2. Cathodoluminescence microscope (CL)
Intersection of recrystallized bands and FIPs
3. Microthermometry
Fluid composition, formation conditions

5. Results I. Texture and deformation characteristics
Intracrystalline alteration
Defromation lamellae
Low-degree recrystallization
Moderate-degree recrystallization
CL images

6. Results II. Fluid inclusion microthermometry
Th: °C
Tm(Ice): -4,4- -7,9 °C
Salinity: 7,21-11,73% wNaCl equiv.
n= 49
Th: °C
Tm(Ice): -18,2- -24,6 °C
Salinity: 20,05-25,83 wNaCl equiv. %
n= 35
Th: 25,6-30,4 °C
Tm(Ice): -56,2- -57,2°C

7. Deformation lamellaes
Results explanation
Quartz recrystallization conditions
(based on texture)
Progressive process!
BLG II./SGR °C
BLG I. °C
Deformation lamellaes
< 300 °C

8. Relative age of fluid inclusions
Results explanation
Relative age of fluid inclusions
CL images
Inclusion petrography
I. group
NaCl-H2O
Wide interval of Th
″relict″ and ″neonate″ inclusions
Entrapment: before recrystallization
II. group
NaCl-CaCl2-H2O
Irregular shape
″diffusive″ spread in recrystallized zone
Entrapment: after recrystallization
III. group
CO2-H2O
Decarbonization
Entrapment: before recrystallization

9. Results explanation Data comparison with previous fluids from the Mórágy Complex
Poros et al. (2009)
Ófalu Complex (FIPs)
Mórágy Complex (FIPs)
On the basis of Dabi et al. (2009, 2011) study
Salinity is less or not sensitive compared toTh (Th is also sensitive to changes in fluid pressure)
Not detected in vein-filling minerals in rocks of the Ófalu Complex

10. Results explanation Datas comperament with previous fluids from Mórágy Complex
Szabó et al. (2003)
Ófalu Complex (FIPs)
Mórágy Complex (Vein)
FIP from rock-bearing quartz of Mórágy Complex
Secondary fluid inclusions from Mórágy Complex
Conspicuous analogy with primary origin fluids in vein-bearing calcite and dolomite of the Mórágy Complex
Final phase, high salinity fluids of hydrotermal activity (Szabó et al. 2003)
Diffusive vs. Fracture channelized flow

11. Results explanation Possible scenarios
FIPs from Ófalu Complex and primary fluid inclusions from Mórágy Complex (Szabó et al. 2003)
FIPs from Ófalu Complex
FIPs from Mórágy Complex (Poros et al. 2009)
Secondary fluid inclusions from Mórágy Complex Poros et al. (2009)

12. Discussion Lateral secretion quartz formation
Progressive metamorphic phase
I. FIP group entrapment
Irregular inclusions shape
Wide Th inerval
Local fluid movement
III. (FIP) group entrapment
Metamorphic process (decarbonization of carbonate rocks)
CO2 increasing because of the ductile deformation
Local fluid movement
Ductile deformation
million years, °C (Lelekes-Felvári et al., ; Shatagin et al., 2004; M. Tóth et al., 2005)
Related defromation marks in the quartz texture
Irregular inclusions shape
II. FIP group entrapment
Direction of spread in the quartz was affected by the
subgrain boundaries
Regional fluid movement

13. Discussion Ófalu Complex Baksa Complex (Fintor et al., 2009)
Deep basin or sedimental infiltration origin
Diffusional flow
Advective flow
Primary entrapment
FIP
Mórágy Complex
Téseny Sandstone
Formation (Fintor et al., 2009)
Deep basin or sedimental infiltration origin
Geothermal heating
Diffusional flow
Advective flow
Secondary entrapment
Primary entrapment
FIP
Deep basin origin
Advective flow
Hidrothermal heating
Primary entrapment

14. Thank you for your attention!
I would like to express my thanks to my consultant, Dabi Gergely that he has called my attention to ″everything″ and was always ready to help me.
Thank you
for your attention!