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Fluid chemistry and fluid-rock interaction of Alpine veins, Central Alps

English title Fluid chemistry and fluid-rock interaction of Alpine veins, Central Alps
Applicant Heinrich Christoph
Number 146681
Funding scheme Project funding (Div. I-III)
Research institution Departement Erdwissenschaften ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Geochemistry
Start/End 01.04.2013 - 30.06.2014
Approved amount 74'179.00
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All Disciplines (5)

Discipline
Geochemistry
Physical Chemistry
Geochronology
Mineralogy
Other disciplines of Earth Sciences

Keywords (10)

LA-ICP-MS; hydrothermal systems; Alps; metamorphic rocks; fluid-rock interaction; Ar-Ar dating; thermodynamic modeling; fluid chemistry; reactive transport; geochronology

Lay Summary (German)

Lead
Die Bildung von Zerrklüften gibt entscheidende Hinweise um die Entstehungsgeschichte der zentralen Alpen besser zu verstehen. Dieses Projekt untersucht die Entstehung von Zerrklüften entlang einer Geotraverse durch die Zentralalpen anhand von Flüssigkeitseinschlüssen, welche Rückschlüsse auf Temperatur- und Druckverhältnisse, sowie zum geochemischen Umfeld zur Zeit der Entstehung geben. Die zusätzliche Kombination mit Altersdaten erlaubt eine zeitliche Einordnung der Entstehungsprozesse.
Lay summary

Metamorphe Gänge sind ideal geeignet, um Fluidbewegungen und Fluid-Gesteins-Interaktionen während gebirgsbildender Prozesse zu verstehen. In der verlängerten Projektphase dieses Projekts zu Fluidchemie und Fluid-Gesteins-Interaktionen in alpinen Zerrklüften sollen die bisher gewonnenen Daten zu Feldbeziehungen, Gesteinsgeochemie und chemischen Zusammensetzungen von Fluideinschlüssen mit Altersdatierungen und thermodynamischer Modellierung von Fluid-Gesteins-Reaktionen kombiniert werden. Dazu ist bereits ein umfangreicher Datensatz zu Konzentrationen an Alkali- und Erdalkalimetallen, Erzmetallen, Metalloiden (B, As, Sb) und Liganden (S, Br, Cl) in Fluideinschlüssen aus Klüften entlang einer Geotraverse durch die Zentralalpen der Schweiz gewonnen worden. Diese Daten erlauben eine Rekonstruktion der Fluidentwicklung der alpinen Zerrklüfte. Die Kombination der Temperatur- und Druck-Daten von Fluideinschlüssen mit geochronologisch mittels der Ar-Ar Methode bestimmten Altersdaten für die Zerrklüfte wird uns ermöglichen, die Druck- und Temperaturgeschichte zu rekonstruieren. Dies erlaubt direkte Rückschlüsse auf die Erosions-, Heraushebungs- und Abkühlungsgeschichte der zentralen Alpen.

Direct link to Lay Summary Last update: 06.05.2013

Responsible applicant and co-applicants

Employees

Publications

Collaboration

Group / person Country
Types of collaboration
Prof. T. Wagner (University of Helsinki) Finland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Jan Wijbrans (VU University Amsterdam) Netherlands (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Dr. Thilo Arlt (independent consultant) Switzerland (Europe)
- Publication
Dr. D.A. Kulik (Paul-Scherrer-Institut) Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results

Associated projects

Number Title Start Funding scheme
130201 Fluid chemistry and fluid-rock interaction of Alpine veins, Central Alps 01.04.2010 Project funding (Div. I-III)

Abstract

This is an extension proposal of a PhD project studying the fluid chemistry and fluid-rock interaction processes of Alpine fissure veins, Central Alps, Switzerland. Metamorphic veins are one of the most important sources of information about fluid flow and fluid-rock interaction during orogenic processes, have been extensively studied from a structural, fluid inclusion and stable isotope perspective, and provide some of the most precise geobarometric data about the late-metamorphic history of mountain belts. In the current project we documented the field relationship, mineralogy, whole-rock geochemistry and fluid inclusion characteristics of 6 selected Alpine vein systems in the Central Alps. Detailed analysis of the vein mineralogy and paragenesis was performed as well as geochemical analysis of wall and host rocks. Fluid inclusion assemblages in quartz were studied by combining microthermometry, Raman spectroscopy and LA-ICPMS microanalysis. A large number of aqueous and aqueous-carbonic fluid inclusion assemblages with clear textural timing relationships were measured, quantifying the concentrations of alkali metals, alkaline earth elements, several transition metals as well as some non-metals (S, Cl, Br) and semi-metals (B, As, Sb). In the remaining time of the current project we will mostly focus on the thermodynamic modeling of fluid-rock interaction and obtain independent data for the temperature and pressure evolution of each vein locality. We request an extension of the project to complete this major new dataset, and to additionally obtain geochronological data by spatially resolved Ar-Ar dating of adularia and white mica from the studied veins. The combination of these two datasets will be the key innovation of this PhD thesis, because absolute time information about the fluid inclusion evolution will allow independent interpretation of the pressure and temperature history of the veins. Unlike conventional thermochronology alone, the pressure data will provide direct constraints on the exhumation, erosion and cooling history of the Central Alps.
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