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Case studies of halogen behaviour during prograde and retrograde contact metamorphism

English title Case studies of halogen behaviour during prograde and retrograde contact metamorphism
Applicant Baumgartner Lukas P.
Number 153094
Funding scheme Project funding (Div. I-III)
Research institution Institut de Minéralogie et Géochimie Université de Lausanne
Institution of higher education University of Lausanne - LA
Main discipline Geochemistry
Start/End 01.04.2014 - 31.03.2017
Approved amount 610'000.00
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All Disciplines (4)

Discipline
Geochemistry
Geology
Mineralogy
Other disciplines of Earth Sciences

Keywords (6)

thermodynamics; halogen; chlorine isotope; contact metamorphism; SIMS; fluid-rock

Lay Summary (German)

Lead
Wasser-haltige Mineralien bauen neben OH- auch chlor oder flour ein. Das Forschungsprojekt etabliert ein Inventar der H,Cl, und F Konzentrationen, sowie der Isotopen Zusammensetzung von O, H, Cl in diesen Mineralien in Kontaktaureolen von Graniten in der oberen und mittleren Kruste mit Hilfe der Ionensonde. Diese Daten werden verwendet um Massenbilanzen der Halogene während der Kontaktmetamorphose zu erstellen. Thermodynamische Modelle werden entwickelt, um die Zusammensetzung der wässerigen Phase während der Metamorphose zu verstehen. Besonders die Konzentrationen von Chlor, aber auch Fluor in superkritischen Fluids sind ausschlaggebend für die Löslichkeit der meisten Erz-formierenden Metalle, aber auch der Hauptelemente von Gesteinen. Ein detailliertes Verständnis ist deshalb wichtig für die Bildung megasomatischer Gesteine, der gesamten Elementbalance während der Metamorphose.
Lay summary

Die Zusammensetzung der wässerigen Phase während der Metamorphose wurde seit Anfang des letzten Jahrhunderts studiert. Fluideinschlüsse, gefangen in Mineralien können nun seit ungefähr 15 Jahren quantitative chemisch analysiert werden. Detaillierte Studien in jetamorphen Gesteinen haben nun aber gezeigt, dass die Einschlüsse oft nicht eindeutig zu den jetamorphen Events zugeordnet werden können. Zusätzlich haben detaillierte Studien gezeigt, dass Einschlüsse sich verändern können durch Reaktion mit dem Mineralbehälter oder durch diffusion. In diesem Projekt wird ein alternativer Ansatz verfolgt: OH-haltige Mineralien (e.g. Biofit, Amphibol, Apatit, etc.) enthalten Spuren von Chlor und Fluor. Durch in-Situ Analysen dieser Halogene, und Wasserstoff und Sauerstoff können nun quantitative Austauschreaktionen mit der zum Zeitpunkt der Kristallisation präsenten Fluidphase geschrieben werden. Thermodynamische Modelle erlauben dann das Berechnen der Halogen- und Metalkonzentrationen der wässerigen Phase während der Metamorphose. Zusätzlich können die stabilen Isotopenverhälnisse von H, O, und Cl bestimmt werden. Diese wiederum werden es erlauben Rückschlüsse über den Ursprung dieser Fluiden und ihrer Halogene zu ziehen.

Wir werden diesen Ansatz auf die seichte Torres del Paine Intrusion (Chile, Patagonien) und die etwas tiefer eingedrungene Little Cottonwood Intrusion  (Utah, USA) anwenden. Dabei kann das verhalten der jetamorphen Fluida während der prograden Entwässerungsreaktionen, dem partiellen Schmelzen von Tonsteinen, und während den anschliessenden retrograden Reaktionen im Detail studiert werden. Zentral für diese Studien ist die neue Ionensonde der SwissSIMS, ein nationales Forschungslabor an der Universität Lausanne.

Direct link to Lay Summary Last update: 28.03.2014

Responsible applicant and co-applicants

Employees

Publications

Publication
Biotite Reference Materials for Secondary Ion Mass Spectrometry 18O/16O Measurements
Siron Guillaume, Baumgartner Lukas P., Bouvier Anne-Sophie, Putlitz Benita, Vennemann Torsten (2017), Biotite Reference Materials for Secondary Ion Mass Spectrometry 18O/16O Measurements, in Geostandard and Geoanalytical Reserarch, 41(2), 243-253.
Evaluation of potential monazite reference materials for oxygen isotope analyses by SIMS and laser assisted fluorination
Didier Amélie, Putlitz Benita, Baumgartner Lukas P., Bouvier Anne-Sophie, Vennemann Torsten (2017), Evaluation of potential monazite reference materials for oxygen isotope analyses by SIMS and laser assisted fluorination, in Chemical Geology , 450, 199-209.
SIMS chlorine isotope analyses in melt inclusions from arc settings
Manzini Melina, Barnes J.D., Bonifacie M, Rose-Koga E.F., Ulmer P., Métrich N., Bardoux G., Layne G.D., Straub S., Baumgartner L.P., John T (2017), SIMS chlorine isotope analyses in melt inclusions from arc settings, in Chemical Geology, 449, 112-122.
Calculating Titanium Diffusion in Quartz-Phenocrysts from Nano Scale Profiles: An Example from a Jurassic rhyolite, Chon Aike Province (Fitz Roy, Patagonia).
Seitz Susanne, Putlitz Benita, Baumgartner Lukas P., Escrig Stefan, Bouvier Anne-Sophie (2016), Calculating Titanium Diffusion in Quartz-Phenocrysts from Nano Scale Profiles: An Example from a Jurassic rhyolite, Chon Aike Province (Fitz Roy, Patagonia)., in Geology, 44, 67-70.
Contrasting hydrological processes of meteoric water incursion during magmatic–hydrothermal ore deposition: An oxygen isotope study by ion microprobe
Fekete Szandra, Weis P., Driesner T., Bouvier A.-S., Baumgartner L.P., Heinrich C.A. (2016), Contrasting hydrological processes of meteoric water incursion during magmatic–hydrothermal ore deposition: An oxygen isotope study by ion microprobe, in Earth and Planetary Science Letters , 451, 263-271.
Quartz reference materials for oxygen isotope analysis by SIMS
Seitz Susanne, Baumgartner Lukas P., Bouvier Anne-Sophie, Putlitz Benita, Vennemann Torsten (2016), Quartz reference materials for oxygen isotope analysis by SIMS, in Geostandards and Geoanalytical, 1-7.

Collaboration

Group / person Country
Types of collaboration
Dr. Benita Putlitz, University of Lausanne Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. Anne-Sophie Bouvier Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Prof. Othmar Müntener, University Lausanne Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Prof. Torsten Vennemann Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Magali Bonifacie France (Europe)
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Swiss Geosciences Meeting Poster The magmatic-hydrothermal transition at the Torres del Paine igneous complex, Chile –Torres del Paine first results of an on-going fluid/melt inclusion study 18.11.2016 Geneva, Switzerland Baumgartner Lukas P.;
Swiss Geosciences Meeting Talk given at a conference Control of water activity on the hydroxyl content of biotite 18.11.2016 Geneva, Switzerland Siron Guillaume; Baumgartner Lukas P.;
Swiss Geosciences Meeting Talk given at a conference Stable isotope exchange and reactive fluid- flow around hydrothermal veins 18.11.2016 Geneva, Switzerland Baumgartner Lukas P.;
Swiss Geosciences Meeting Talk given at a conference Deciphering the different sources of Cl input into the mantle beneath St. Vincent (Lesser Antilles Arc): insight from B, O and Cl isotopes 11.11.2016 Geneva, Switzerland Baumgartner Lukas P.;
TIGER Conference Talk given at a conference A SIMS study of oxygen isotope exchange around veins in dolomite xenoliths in shallow intrusions 26.09.2016 Perth, Australia Baumgartner Lukas P.;
GSA Annual Meeting Talk given at a conference OXYGEN ISOTOPE CONSTRAINTS ON CRUSTAL MELTING: SIMS DATA FROM JURASSIC RHYOLITES OF THE CHON AIKE PROVINCE (PATAGONIA, ARGENTINA) 25.09.2016 Denver, United States of America Baumgartner Lukas P.;
GSA Annuel Meeting Talk given at a conference REACTIVE FLUID-FLOW AND STABLE ISOTOPE EXCHANGE RELATED TO HYDROTHERMAL VEINS IN CARBONATE XENOLITHS: A COUPLED CL IMAGING AND SIMS STUDY 25.09.2016 Denver, United States of America Baumgartner Lukas P.;
GSA Annual Meeting Talk given at a conference WATER CONTENT OF BIOTITE AS MONITOR OF CHANGE IN WATER ACTIVITY 25.09.2016 Denver, United States of America Baumgartner Lukas P.; Siron Guillaume;
GSA Annuel Meeting Poster MINERAL AND ROCK TEXTURES ACCOMPANYING THE ANTIGORITE BREAKDOWN TO FORSTERITE + TALC IN THE BERGELL CONTACT AUREOLE (ITALIAN ALPS) 25.09.2016 Denver, United States of America Baumgartner Lukas P.;
GSA Annual Meeting Poster MULTI FLUID-FLOW EVENTS DURING MODE I OPENING: A MICROSTRUCTURAL AND SIMS STUDY 25.09.2016 Denver, United States of America Baumgartner Lukas P.;
GSA Annual Meeting Poster LIMITED FLUID FLOW IN THE TORRES DEL PAINE CONTACT AUREOLE (PATAGONIA, CHILE) 25.08.2016 Denver, United States of America Baumgartner Lukas P.; Siron Guillaume;
EGU General Assembly 2016 Poster Decrease in water activity due to fluid absent partial melting monitored with water content in biotite in the Western Adamello contact aureole (Italy) 17.04.2016 Vienna, Austria Baumgartner Lukas P.; Siron Guillaume;
Swiss Geosciences Meeting Talk given at a conference What does chlorine content in biotite say about the metamorphic fuids: Case studies from the Torres del Paine and Western Adamello contact aureoles 20.11.2015 Basel, Switzerland Siron Guillaume; Baumgartner Lukas P.;
Swiss Geosciences Meeting Talk given at a conference Apatite volatile and trace element variations : a new tool to study geochemical and petrogenetic processes in the calc-alkaline Adamello batholith 20.11.2015 Basel, Switzerland Baumgartner Lukas P.;
GSA Annual Meeting Talk given at a conference A NANOSIMS STUDY: MAGMA STORAGE AS RECORDED IN QUARTZ PHENOCRYSTS FROM A LARGE SILICIC PROVINCE (PATAGONIA, ARGENTINA) 01.11.2015 Baltimore, United States of America Baumgartner Lukas P.;
GSA Annuel Meeting Poster METAMORPHISM OF METAPELITES IN THE LITTLE COTTONWOOD CONTACT AUREOLE, UTAH, USA 01.11.2015 Baltimore, United States of America Marger Katharina; Baumgartner Lukas P.;
GSA Annual Meeting Poster PETROLOGY AND STABLE ISOTOPE STUDY OF THE OPHICALCITES OF THE CHENAILLET COMPLEX, WESTERN ALPS, FRANCE 01.11.2015 Baltimore, United States of America Baumgartner Lukas P.;
GSA Annual Meeting Talk given at a conference CHLORINE CONTENT IN BIOTITE OF THE TORRES DEL PAINE AND WESTERN ADAMELLO CONTACT AUREOLES: A PROGRADE OR RETROGRADE SIGNAL? 01.11.2015 Baltimore, United States of America Baumgartner Lukas P.; Siron Guillaume;
GSA Annual Meeting Talk given at a conference MECHANISM OF STABLE ISOTOPE EXCHANGE IN HYDROTHERMAL OLIVINE-CALCITE VEINS, BERGELL, ITALY: PERSPECTIVES BASED ON OXYGEN ISOTOPE SIMS ANALYSIS 01.11.2015 Baltimore, United States of America Baumgartner Lukas P.; Siron Guillaume;


Associated projects

Number Title Start Funding scheme
172513 Chlorine, fluorine, and water in contact metamorphic environments 01.04.2017 Project funding (Div. I-III)
163991 A FEG-Electronprobe Microanalyzer for analysis of Earth materials at the sub-micron scale 01.04.2016 R'EQUIP
171722 Boron isotope fractionation in crustal granite systems 01.01.2017 International short research visits

Abstract

I propose to study the halogen and hydrogen content (F, Cl, H) a of OH-bearing minerals (biotite muscovite/phengite, and apatite) in meta-pelites of two contact aureoles to deduce metamorphic fluid compositions. Stable isotope compositions of chlorine, oxygen, and hydrogen will be measured in the same minerals to track dehydration and hydration reactions, identify potential fluid infiltration, and fluid un-mixing (if present). The aim is to establish 1) a comprehensive inventory of halogens in contact metamorphic pelites; 2) identify the effect of dehydration reactions; 3) study the effect of partial melting on the composition of fluids present; and to identify the signature of retrograde hydration of pelitic rocks surrounding upper crustal and upper-middle crustal intrusive rocks.Two case studies are proposed: I) The 12.5 Ma old Torres del Paine granite laccolith (Patagonia, Chile) intruded in the upper most crust (˜ 3km deep) into a series of anchi- to lower greenschist facies, immature Cretaceous turbidites. During metamorphism, the clastic mineralogy is re-equilibrated, and mostly hydrated in the outermost aureole. The highest metamorphic grade is cordierite-biotite-K-feldspar hornfels. Very limited fluid infiltration and nearly no retrograde reactions occurred. II) The Little Cottonwood granodiorite stock (Utah, USA) intruded into a thick sequence of late Proterozoic (lower) anchizone metamorphic quartzites and pelites. The highest grade rocks are magnetite-cordierite-sillimanite-biotite rocks showing abundant partial melting. Intrusion depth is estimated at ca. 10-12km. Crystallization of partial melts resulted in locally abundant retrograde muscovite. These contact aureoles were selected to contrast the effect of a) “wet” prograde metamorphism of non-metamorphic rocks undergoing dehydration (case II) versus partially “dry”, since host rocks in the far-field of the Paine aureole (case I) had to be hydrated (immature clastic mineralogy of high-grade metamorphic or igneous origin); b) upper middle crustal (II) versus upper crustal intrusions and contact metamorphism (I) and c) the effect of partial melting (case II) versus no melting (I). Finally, the Torres del Paine shows abundant effect of igneous water saturation upon crystallization (miarolitic cavities), and preliminary data shows small amount of igneous fluids infiltrated the host rocks, whereas no cavities are present in the Little Cottonwood.Major element, fluorine, and chlorine analysis will be obtained by electron microprobe (EMP). Our secondary ion microprobe (IMS1280HR SwissSIMS) will be used where concentrations are too low (e.g. <50-100ppm F, Cl), for hydrogen analysis and isotope (O,H,Cl) analysis of minerals. Traditional isotope analysis (O,H) will be used for mineral separates. The OH-/Cl- and OH-/F- ratios in minerals will be used to calculate the HF°/H2O and HCl°/H2O activity ratios for metamorphic fluids using available experimental calibrations. Thermodynamic data for aqueous species and minerals permit to calculate total halogen concentrations in the fluid phase and mass balances for halogens.Contact aureoles were selected in this proposal, because their geology is relatively simple, and rapid cooling optimizes the chances to prevent resetting of halogen concentrations during retrogression
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