Download In situ Cl/Br analyses in fluid inclusions and minerals

4:00 - 4:45pm
Thursday 14th May 2015
Woolnough Lecture Theatre
Johannes Hammerli
In situ Cl/Br analyses in fluid inclusions and minerals:
Identification of fluid sources in the Earth’s crust
The Centre for Exploration Targeting (CET) is pleased to invite you to a Guest Lecture in the CET
Seminar Series given by Johannes Hammerli “In situ Cl/Br analyses in fluid inclusions and minerals:
Identification of fluid sources in the Earth’s crust”
ABSTRACT
Chlorine and bromine are common constituents of fluids derived from various sources and because they
have relatively low abundances in the majority of silicate minerals, they can be used to trace the origin of
fluids in sedimentary, metamorphic and hydrothermal/magmatic systems. Halogens are important ligands
for metal transport in hydrothermal solutions; hence Br and Cl behaviours in hydrothermal environments
may be crucial for mass transfer and ore forming processes. However, halogen studies can be challenging
if crucial samples lack fluid inclusions or contain multiple fluid inclusion generations, which limits the
effective use of routine bulk-rock techniques. Bromine in particular is not easily measured by routine
analytical tools, such as electron probe microanalysis, and quantification of iodine is limited by its low
abundance (ppb) in most materials. Recent developments now permit in situ LA-ICP-MS quantification
of Br and Cl in individual fluid inclusions and mineral zones, which allows for the reconstruction of fluid
systems and origins in sedimentary, metamorphic and hydrothermal/magmatic systems. Example studies
from the Mary Kathleen Fold Belt, Mt Isa Inlier and the Adelaide Fold Belt, South Australia will be discussed.
BIOGRAPHY
Johannes Hammerli received his PhD from James Cook University in 2014, where he studied element mobility
during metamorphism and the identification of hydrothermal fluids by microanalysis. He has joined the CET
with funding from a Swiss National Science Foundation Fellowship. At the CET he is focused on studying
crustal differentiation and evolution processes, and he remains active on projects that aim to identify fluid
sources in various geological settings.
VENUE
Woolnough Lecture Theatre (1.07), Geography and Geology Building
University of Western Australia, 35 Stirling Hwy, Crawley 6009
TIME
Pay parking is available along Fairway (approx. $1.50 per hour)
4:00 - 4:45pm Thursday 14th May 2015
         
You are invited to join us afterwards for refreshments provided by our local
SEG Student Charter in the Resource Room, Robert Street Building.