miarolitic cavities; magmatic-hydrothermal transition; analytical geochemistry; Molybdenum isotope fractionation; element distribution coefficients; aqueous fluid inclusions; melt inclusions; LA-ICP-MS
KaufmannAnne, PettkeThomas, BaumgartnerLukas (2018), Element Partitioning at the Magmatic-Hydrothermal Transition in a Shallow Plutonic System
, Goldschmidt Conference 2018, Boston, USA.
Kaufmann Anne, Pettke Thomas, Baumgartner Lukas (2017), Fluid-involved processes at the magmatic-hydrothermal transition in Torres del Paine, Chile, studied through inclusions in miarolitic quartz. Abstract
, Abstract Volume of the 15th Swiss Geoscience Meeting, Davos, Switzerland, Abstract pp. 83 - 84.
Kaufmann Anne, Pettke Thomas, Baumgartner Lukas (2017), Fluid-involved processes at the magmatic-hydrothermal transition in Torres del Paine, Chile, studied through fluid inclusions in miarolitic quartz. Abstract
, 14th Biennial SGA Meeting, Quebec City, Canada, 20-23 August 2017, Abstract number: 173-VXAj-53.
Kaufmann Anne, Pettke Thomas, Baumgartner Lukas (2017), The magmatic-hydrothermal transition at the Torres del Paine igneous complex, Chile - documented by silicate melt and aqueous fluid inclusions in miarolitic quartz. Abstract
, ECROFI 2017 - Nancy, France, 23-29 June 2017, Abstract S3.T13.
Kaufmann Anne, Pettke Thomas, Baumgartner Lukas (2016), The magmatic-hydrothermal transition at the Torres del Paine igneous complex, Chile - first results of an on-going fluid/melt inclusion study. Abstract
, 14th Swiss Geoscience Meeting, Geneva, Switzerland, 18-19 November 2016, Abstract P 2.7.
PettkeThomas, DiamondLarryn (2015), Fluid Inclusion Gold Concentrations: From Analysis to Implications for Hydrothermal Ore Formation
, ECROFI-XXIII Extended Abstracts Volume, Leeds - UK, 27 - 29 June, 2015.
Audétat Andreas, Garbe-Schönberg Dieter, Kronz Andreas, Pettke Thomas, Rusk Brian, Donovan John J., Lowers Heather A. (2015), Characterisation of a Natural Quartz Crystal as a Reference Material for Microanalytical Determination of Ti, Al, Li, Fe, Mn, Ga and Ge, in Geostandards and Geoanalytical Research
, 39(2), 171-184.
Kaufmann Anne, Pettke Thomas, O'SullivanEdel, WilleMartin, Molybdenum isotope fractionation between melt, exsolved fluid and hydrothermal minerals at the magmatic-hydrothermal transition
, GeoMünster 2019, Münster, Germany, 22.9.2019.
In the evolution of igneous systems the magmatic-hydrothermal transition is the stage where specific elements get mobilized by partitioning into an aqueous fluid exsolving from crystallizing magmas. Knowledge of fluid/melt partition coefficients is thus essential to quantify the mass transfer of elements from magmas into diverse geological environments, including the subvolcanic realm where magmatic-hydrothermal ore deposits may form or into the atmosphere via quiet or violent volcanic degassing.This project proposes to quantify, in the subvolcanic magmatic environment, (i) element distribution coefficients between residual melt, minerals, and aqueous fluids for well over 25 elements, from Li to U, and (ii) Mo isotope fractionation between residual silicate melt, minerals and exsolving aqueous fluids. Focus is on the Torres del Paine igneous system that documents - at excellent outcrop conditions - diverse features of fluid saturation. These include pegmatoid to frothy zones and miarolitic cavities within the intrusive bodies that record hydrothermal processes from ~750 down to ~300 °C that appear not to have communicated with the rocks hosting the intrusions. Coexisting silicate melt and aqueous fluid inclusions, minerals and coexisting liquid-vapour fluid inclusions will be analyzed by detailed microscopy, Raman spectroscopy, LA-ICP-MS, EPMA, SIMS, and by liquid sample MC-ICP-MS techniques. The new partitioning data shall be interpreted in light of intensive parameters, e.g., fO2, fluid chlorinity at exsolution, concentration of other volatiles (F, S), and melt composition (e.g., aluminum saturation index, Cl/H2O concentration ratio) of which some have already been tightly constrained thanks to diverse research initiatives during the past years.Our recent finding of prominent Mo isotope fractionation during igneous differentiation up to and including fluid exsolution awaits confirmation by direct analysis of coexisting fluid and melt fractions (available in fluid and melt inclusions). Because fayalite is stable in the miarolitic cavities, fluid - ferrous silicate mineral d98Mo can also be quantified (note that common cavity minerals like quartz and feldspars do not host Mo).This project and future research initiatives in this direction are considered to be essential for our better understanding of how magmatic volatiles play their central role in the transport of chemical components between active magmatic systems and diverse geologic environments and, more specifically, what the decisive parameters are for the formation of magmatic-hydrothermal ore deposits.