Project

Back to overview

Determination of paleo-temperatures using fluid inclusion liquid-vapour homogenization in speleothems: Correction of the measured temperature data

English title Determination of paleo-temperatures using fluid inclusion liquid-vapour homogenization in speleothems: Correction of the measured temperature data
Applicant Frenz Martin
Number 134861
Funding scheme Project funding (Div. I-III)
Research institution Institut für angewandte Physik Universität Bern
Institution of higher education University of Berne - BE
Main discipline Other disciplines of Physics
Start/End 01.04.2011 - 30.09.2012
Approved amount 108'410.00
Show all

All Disciplines (4)

Discipline
Other disciplines of Physics
Geochronology
Other disciplines of Earth Sciences
Climatology. Atmospherical Chemistry, Aeronomy

Keywords (8)

speleothems; fluid inclusions; thermodynamic model ; phase nucleation; microthermometry; paleoclimate; bubble collapse; femtosecond laser

Lay Summary (English)

Lead
Lay summary

measurements and volume determinations of fluid inclusions that have formed atwell-defined temperatures. These data will be obtained from recent naturalfluid inclusions in stalagmites that have formed at known cave air temperaturesand additionally from synthetic fluid inclusions in calcite crystals that aregrown in the laboratory under controlled temperature and ambient atmosphericpressure conditions. The results of this study are of general interest for theunderstanding of the physics of liquid-vapour interfaces and may contribute toa significant improvement of theoretical models currently in use.Thassumed,directly represent the cave air temperature at which the stalagmite had beenformed and that closely matches the mean annual surface temperature outside thecave. Therefore, we develope a model taking the temperature dependent variationof the surface tension as well as the effect of the interface curvature, i.e.,the bubble radius into account. The experimental approach relies on valuesmeasured from fluid inclusions of a stalagmite do not, as we initially Th. As a result, the ThThegoal is to evaluate the potential of fluid inclusion liquid-vapourhomogenisation temperatures in stalagmites as a new approach for quantitativereconstructions of mean annual surface temperatures and to develop a reliablemethodology for the application in paleoclimate research. Thermodynamic modelcalculations have revealed that the surface tension at the liquid-gas interfaceof the vapour bubble has a significant effect on the measured homogenisationtemperatures
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Determining gypsum growth temperatures using monophase fluid inclusions—Application to the giant gypsum crystals of Naica, Mexico
Krüger Yves, Garcia-Ruiz Juan Manuel, Canals Àngels, Marti Dominik, Frenz Martin, Van Driessche Alexander E.S., Determining gypsum growth temperatures using monophase fluid inclusions—Application to the giant gypsum crystals of Naica, Mexico, in Geology.

Collaboration

Group / person Country
Types of collaboration
Laboratorio de Estudios Cristalográficos Edifício Inst. López Neyra Spain (Europe)
- Publication
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Palaeotemperatures from liquid-vapour homogenisation temperatures of fluid inclusions in stalagmites, Swiss Geoscience Meeting 2011 11.11.2011 Zurich, Switzerland
Fluid inclusions in stalagmites used as a quantitative thermometer in paleoclimate research, Goldschmidt Conference 19.08.2011 Prague, Czech Republic
Correcting stalagmite fluid inclusion homogenisation temperatures for the effect of surface tension; ECROFI XXI 09.08.2011 Leoben, Austria


Associated projects

Number Title Start Funding scheme
132646 STALCLIM - Multi-proxy climatic and environmental reconstructions from stalagmites from Switzerland, Turkey, Arabia and India 01.01.2011 Sinergia
119966 Determination of paleotemperatures from fluid inclusion liquid-vapour homogenization in speleothems 01.04.2008 Project funding (Div. I-III)
140777 Exploration of the phase diagram of liquid water in the metastable region by means of synthetic fluid inclusions 01.03.2013 Project funding (Div. I-III)

Abstract

The present research proposal requests for funding of a 18 month extension of our SNF project, entitled: Determination of paleotemperatures using fluid inclusion liquid-vapour homogenization in speleothems (Grant no. 200021-119966/1) in order to allow the PhD student to safely finish her PhD study. The aim of the research project is to evaluate the potential of fluid inclusion liquid-vapour homogenisation temperatures in stalagmites as a new approach for quantitative reconstructions of mean annual surface temperatures and to develop a reliable methodology for the application in paleoclimate research. Our thermodynamic model calculations have revealed that the surface tension at the liquid-gas interface of the vapour bubble has a significant effect on the measured homogenisation temperatures Th. As a result, the Th values measured from fluid inclusions of a stalagmite do not, as we initially assumed, directly represent the cave air temperature at which the stalagmite had been formed and that closely matches the mean annual surface temperature outside the cave. Therefore, we developed a model taking the surface tension into account. Comprehensive comparison of experimental and theoretical Th values however revealed, that the accuracy of this model is still not sufficient to precisely determine the actual formation temperatures. The reason is that our model presently accounts only for the temperature dependent variation of the surface tension, but neglects the effect of the interface curvature. As a result, the corrected homogenisation temperatures display a systematic overestimation of the actual stalagmite formation temperatures that increases with decreasing inclusion volumes and thus indicates an overestimation of the surface tension that depends on the bubble radius. Therefore we intend to improve the present model by incorporating a correction for surface tension that additionally accounts for the effect of the interface curvature, i.e., the bubble radius. As outlined before, the surface tension at the liquid-gas interface of the vapour bubble plays a crucial role in deriving accurate stalagmite formation temperatures and mean annual surface temperatures, respectively, from measurements of liquid-vapour homogenisation temperatures. We therefore plan to focus our investigations primarily on the determination of an empirical correction of the temperature dependence of the surface tension by means of experimental data derived directly from fluid inclusions and to develop an improved surface tension model that provides a more accurate correction for the measured temperature data. The experimental approach relies on Th measurements and volume determinations of fluid inclusions that have formed at well-defined temperatures. These data will be obtained from recent natural fluid inclusions in stalagmites that have formed at known cave air temperatures and additionally from synthetic fluid inclusions in calcite crystals that are grown in the laboratory under controlled temperature and ambient atmospheric pressure conditions. To cover a representative temperature range between 5 and 25°C actively growing stalagmites from Switzerland, Turkey and Oman will be investigated. Synthetic fluid inclusions will be produced in collaboration with Prof. Juan Manuel Garcia-Ruiz (Granada, Spain), and will be used to complement and refine the data derived from the natural inclusions. The immediate purpose of this study is to derive an improved correction for the effect of the surface tension on fluid inclusion liquid-vapor homogenisation temperatures in order to determine stalagmite formation temperatures. Furthermore, the results of this study are of general interest for the understanding of the physics of liquid-vapour interfaces and may contribute to a significant improvement of theoretical models currently in use. Potential applications, besides fluid inclusions, are related, for example, to the formation of cavitations in biological tissues and to nucleation theory.
-