Nitrogen-bearing, aqueous fluid inclusions in some eclogites from the Western Gneiss Region of the Norwegian Caledonides

1989 ◽  
Vol 103 (2) ◽  
pp. 153-165 ◽  
Author(s):  
T. Andersen ◽  
E. A. J. Burke ◽  
H. Austrheim
Keyword(s):  
Fluid Inclusions ◽  
Aqueous Fluid ◽  
Western Gneiss Region ◽  
Norwegian Caledonides

Diagenetic palaeotemperatures from aqueous fluid inclusions: re-equilibration of inclusions in carbonate cements by burial heating

1987 ◽  
Vol 51 (362) ◽  
pp. 477-481 ◽  
Author(s):  
R. C. Burruss
Keyword(s):  
Fluid Inclusions ◽  
Confining Pressure ◽  
Homogenization Temperature ◽  
Aqueous Fluid ◽  
Temperature History ◽  
Maximum Temperature ◽  
Carbonate Cements ◽  
Trapping Temperature ◽  
Observed Behaviour ◽  
The Common

AbstractDiagenetic palaeotemperatures determined from aqueous fluid inclusions can be affected by re-equilibration during burial heating. Calculations based on the observed behaviour of inclusions in fluorite under external confining pressure allows prediction of the temperatures and depths of burial necessary to initiate re-equilibration of aqueous inclusions in the common size range 40 to 4 µm. Heating of 20° to 60°C over the initial trapping temperature may cause errors of 10° to 20°C in the homogenization temperature. This suggests re-equilibration may cause aqueous inclusions in carbonates to yield a poor record of their low-temperature history, but a useful record of the maximum temperature experienced by the host rock. Previous work suggests inclusions containing petroleum fluids will be less susceptible to re-equilibration.

Past hot fluid flows in limestones detected by Δ47–(U-Pb) and not recorded by other geothermometers

Geology ◽  
2020 ◽  
Vol 48 (9) ◽  
pp. 851-856 ◽  
Author(s):  
Benjamin Brigaud ◽  
Magali Bonifacie ◽  
Maurice Pagel ◽  
Thomas Blaise ◽  
Damien Calmels ◽  
...  
Keyword(s):  
Fluid Inclusions ◽  
Thermal History ◽  
Vitrinite Reflectance ◽  
Fluid Flows ◽  
Aqueous Fluid ◽  
Rift System ◽  
History Of ◽  
Clumped Isotope ◽  
Two Stages ◽  
Rock Eval

Abstract Geothermometers are commonly used to reconstruct the diagenetic and thermal history of rocks. However, characterizing the timing, origin, and temperature of paleofluid flow remains challenging because it must be assessed indirectly through the analysis of microscopic cements that precipitate and fill intergranular spaces during fluid circulation. Here, we measure both the clumped isotope (Δ47) temperature and in situ U-Pb age of individual diagenetic calcite cements within a sedimentary section of the Paris Basin (France), whose thermal history has been previously inferred to be <60 °C. We show that cementation occurred during two stages associated with major events at the western European lithospheric scale: (1) the Bay of Biscay rifting (Late Jurassic–Early Cretaceous), and (2) north-south Pyrenean compression (Eocene) followed by east-west extension during the European Cenozoic rift system event (Oligocene). Related to both events, we report unexpectedly hot fluids, up to 110 °C, contrasting with the lower temperatures inferred from other geothermometers (e.g., fluid inclusions, clay minerals, apatite fission tracks, maturity of organic matter by Rock-Eval pyrolysis, or vitrinite reflectance). These high temperatures (>70 °C) have been measured for calcite cements containing single-phase aqueous fluid inclusions, challenging the commonly accepted assertion that the absence of nucleation of a vapor phase indicates crystallization at low temperature (∼<70 °C). We suggest that the kinetics of mineralization events prevented the recording of short-lived hot fluid flows by other geothermometers.

Recognition and significance of multiple fluid inclusion generations in telogenetic calcites

1996 ◽  
Vol 60 (402) ◽  
pp. 813-819 ◽  
Author(s):  
Philippe Muchez ◽  
Marek Slobodnik
Keyword(s):  
Fresh Water ◽  
Fluid Inclusions ◽  
Aqueous Fluid ◽  
The Other ◽  
Variscan Orogeny ◽  
Mineral Formation ◽  
Ambient Fluid ◽  
Lower Carboniferous ◽  
Calcite Cement ◽  
The Relationship

AbstractFerroan and non-ferroan calcites occur in fractures in the Lower Carboniferous of the Variscan foreland of southern Belgium. These fractures post-date the Variscan orogeny and the calcites have a telogenetic origin. The non-ferroan calcites formed by recrystallization of the ferroan calcites. Two types of monophase aqueous fluid inclusions are present in the ferroan calcite cement. Although both types of inclusions formed at a temperature not exceeding 50°C, one type contains a moderately saline fluid (3.6–16.3 eq. wt.% NaCl) and the other type fresh water (Tm ice = 0°C). The fluid inclusions in the non-ferroan calcite also contain fresh water.Detailed petrography of the fluid inclusions indicate that the fresh water migrated through the crystals along opened cleavage planes and microfractures. Therefore, they have a secondary origin. The recrystallization of the ferroan calcites to non-ferroan calcites occurred in this fresh water. The saline fluid inclusions are not related to the above mentioned microstructures and although their origin remains unknown, they could represent the ambient fluid from which the ferroan calcites precipitated. The study of the relationship between the occurrence of fluid inclusions and the microstructures seems promising for the identification of fluid inclusions representing post mineral formation fluid and temperature conditions in calcite cements.

Organic compounds trapped in aqueous fluid inclusions

1998 ◽  
Vol 29 (1-3) ◽  
pp. 195-205 ◽  
Author(s):  
Tim E. Ruble ◽  
Simon C. George ◽  
Mark Lisk ◽  
Robinson A. Quezada
Keyword(s):  
Organic Compounds ◽  
Fluid Inclusions ◽  
Aqueous Fluid
Sign in / Sign up

Export Citation Format

Share Document