It is still possible to register to the SIMS-NanoSIMS workshop, until late May.

More info: here

We are organizing a SIMS workshop at UNIL, from July 6th to July 8th, before the Goldschmidt conference.

Registrations will soon open, until March 1rst.

More info: here

and 

SIMS workshop

 

Call for proposal for Fall 2022 is open. Dealdine is November 14th.

Proposal forms for new projects and for project follow-up can be found on this webpage and should be send to swisssims’at’unil.ch.

For any technical question, please contact anne-sophie.bouvier’at’unil.ch (lab manager) or johanna.marincarbonne’at’unil.ch (head of the lab)

We are pleased to announce that the SwissSIMS is organizing a SIMS Winter School, from January 16^th to 20^th, 2023, at University of Lausanne. Registrations are now open, until October 31rst.

You can find more information on: unil.ch/summerschools/swisssims

Poster_web_SwissSIMS

SwissSIMS call for proposals 2021 is now open.

We strongly encourage submission of projects for which we already have developed the method and have the required standards. Projects needing development (method and/or standard) will be considered, but may be scheduled with a lower priority.

The proposal can be found here. Methods, reference material available and expected precision are described on those 2 pages: standards and analyses.

Please send the proposal, to:

Dr. Anne-Sophie Bouvier, Laboratory Manager of the SwissSIMS by e-mail (swisssims@nullunil.ch) no later September 24^th, 2021.

 

Dear all,

As you may already know, the SwissSIMS lab is closed, as UNIL, until at least April 30^th. The SwissSIMS schedule, originally full until late August, will thus have to be reorganized as soon as we will now when the labs could re-open. It is yet not clear when the SwissSIMS lab will reopen, but we would like to specify 2 points:

• We will first have to perform some tests, to ensure the machine is still working well after 7 weeks (or more) of shutdown
• Social distancing in our lab is hard to maintain. Late March, we were supposed to do maintenance to fix a problem affecting the measurements in Cs mode. We will have to do this maintenance before any Cs mode measurements. And this maintenance requires the presence of 2 persons. So we might be able to run only in “hyperion” mode during the first weeks of reopening, with only one person in the lab (ie, only experienced used).

For those reasons, we decided to cancel the first SwissSIMS call for proposal 2020. The persons originally scheduled until late August will be/have already been contacted and will be kept updated on the schedule. We will discuss with them the different possibilities for their session (report later, or send us the mounts + documentation, or other options)

In the meantime, please let us know if there is any “urgent” project that should be done by the end of this year (or even before, for the PhD students finishing their thesis). We’ll do a priority list and rework the schedule as best as we can.

We apologize for the inconvenience

 

Best wishes,

The SwissSIMS team

Due to Covid-19, the SwissSIMS lab (as UNIL) is closed until April 30th. This might of course last longer, depending on the evolution of the situation.

We will contact all person that were already scheduled until July, so find new dates.

As of January 1rst, 2020 Prof Johanna Marin-Carbonne is now the head of the SwissSIMS lab.

There are 2 PhD and one post-doctoral position available at the University of Lausanne, funded
by a Swiss National Science foundation. The goal is to develop quantitative models of crystal
growth in metamorphic and igneous systems. Top of the line analytical methods (FEG-SEM,
FEG-EMPA, μC-Xray Tomography, SIMS, NanoSIMS) will be used to quantify zoning of
minerals and the zoning around minerals in experimental on porphyroblast growth of igneous
minerals and natural examples of metamorphic porphyroblasts. The amount of local
disequilibrium will be assessed, and quantitative 2 and potentially 3-D models for crystal
growth will be developed. It is expected that one PhD student will focus on the metamorphic
study, while the second PhD will focus on igneous and experimental studies. Finally, the
modelling study will be mostly achieved by the post-doctoral fellow, but PhD students are
expected to contribute to the modelling. More details can be found below.
Applications, including contacts for references and a short motivation statement should be sent
to Lukas Baumgartner (Lukas.baumgartner@nullunil.ch). Evaluation of dossiers will start by
October 14th, but applications will be accepted until filled.

---

Growth models for igneous and and metamorphic minerals: quartz and garnet

This project proposes to use continuum mechanics modelling to understand geochemical and textural aspects of igneous and hydrothermal vein quartz using diffusion-surface reaction models. In these environments, quartz is growing from oversaturated conditions into a structureless continuum. In a first study, I propose to experimentally grow quartz in a rhyolitic melt containing trace elements typical for rhyolite environments. Growth will be induced by changing the saturation of quartz in these melts by changes of water activity, pressure, and temperature in cold seal experiments. Water activity will be changed due to water loss induced by hydrogen gradients between the capsule and the pressure media. Temperature and pressure will be decreased monotonically and cycled to induce polybaric/thermal crystal growth. Rapid quenched capsules will be opened and cut after careful μC-X-ray tomography to locate quartz crystals. Melt halos will be analyzed using low voltage FG-EMPA for major and minor elements and SIMS for trace element composition gradients. SIMS analysis of water and selected cations (Na, Li, Al, H, P) will be performed in the quartz crystals using the newly acquired RF-Hyperion source on the SIMS and NanoSIMS. We will develop a multi element diffusion-reaction kinetics code using initially MATLAB, which will be translated for more complex simulations to graphic cards CPU optimized parallel code using a full Gibbs Free energy minimization.
The second project will explore the conditions under which rhythmically zoned hydrothermal quartz precipitates using the same model, exploring Al poisoning of the surface of quartz as a potential reason for it. Quartz growth in a hydrothermal solution will use the same numerical code, but thermodynamic data for ions and complexes, pH or Na+ as a growth accelerator and Al as a kinetic inhibitor instead. The results will be compared to natural samples of vein quartz. Preliminary work suggests that significant amounts of H+ is included in quartz along with Al3+ to compensate the Si4+ ion in quartz. We will attempt to use the fact that boron isotope fractionation between tourmaline and fluid is strongly pH dependent to see if we can correlate tourmaline isotope composition included in quartz with Al-H zoning of these quartzes.
The final project will explore how far this modelling approach can be used to explain zoning and texture (for example porphyritic) of garnet growth in regional and contact metamorphic environments. To this end we will modify the growth model to include surface kinetic equations for each matrix mineral, modal abundances of the minerals, and a continuum approach to the grain boundary structure. We will attempt to model the zoning of contact metamorphic garnets from the Little Cottonwood stock (Utah, USA) using thermal models. P-T conditions will be monitored using QUIG and Raman in graphite. We will compare our free energy minimization
coupled reaction-diffusion approach with the recently developed effective bulk composition approach (Spear and Wolfe, 2018). In contrast, we expect that the solubility of elements will significantly influence garnet zoning through the development of local depletion and enrichement zones surrounding garnet. Changing surface reaction kinetics for matrix minerals will allow us to approach models which are assuming local equilibrium and Gibbs Duhem relations.

Where: Geopolis building, room 1628 (ground floor)

 

Scientific program

9:15 – 9:30                Welcome coffee

9:30 – 9:40                Introduction

9:40 – 10:00              Carolin Fichtner (ETHZ) 

The origin and inventory of Earth’s carbon content as revealed by SIMS

10:00 – 10:20            Joshua Davis (UNIGE)

Investigating crustal contamination as a source of volatiles for CAMP magmatism: a zircon perspective

10:20 – 10:40            Juliana Troch (ETHZ)

The dark side of zircon: Evidence for fluid saturation in the subvolcanic reservoir of the Mount Jackson-Island Park Rhyolite series in Yellowstone (USA)

10:40 – 11:00            Coffee break

11:00 – 11:20            Emmanuelle Ricchi (UNIGE)

Age and crystallization duration of fissure monazite-(Ce): linking ion probe Th-U-Pb results with hydrothermal dissolution/precipitation events and deformation stages

11:20 – 11:40            Jonas Pape (UNIBE)

²⁶Al-²⁶Mg SIMS dating of chondrules: a window to the early solar system

11:40 – 12:00            Etienne Deloule (CRPG, Nancy)

Development of Sr isotopes measurements by SIMS

12:00 – 14:00            Lunch break

14:00 – 14:20            Alice Vho (UNIBE)

Garnet oxygen isotope analysis by SIMS: Matrix corrections and applications

14:20 – 14:40            Katharina Marger (UNIL)

Development of tourmaline reference material for in-situ isotope analyses by SIMS with application to Monte Rosa whiteschist

14:40 – 15:00            Matthieu Harlaux (UNIGE)

Tracing magmatic-hydrothermal transition processes at the world-class San Rafael tin deposit (Peru) by in situ oxygen isotope and trace element analyses of tourmaline

15:00 – 15:20            Coffee break

15:20 – 15:40            Florian Bulle (UNIBE)

SIMS oxygen isotope study of white mica in a complex magmatic-hydrothermal environment

15:40 – 16:00            Lukas Baumgartner (UNIL)

Tracing fluid flow and time scale in quartz using SIMS

16:00 – 16:20            Elias Bloch (UNIL)

Diffusion kinetic parameters of calcium in olivine retrieved via SIMS depth profiling

16:20 – 16:30            Conclusion