Explanipedia

Mélange Signatures and Low Oxygen Fugacity in Eclogite Xenoliths From the Crust‐Mantle Transition Below a Mesoproterozoic Collision Belt Open

Sonja Aulbach, Heidi E. Höfer, Axel Gerdes, Christel Tinguely, Anton le Roex · 2024

Mass transfer across the crust‐mantle boundary is a fundamental process governing planetary differentiation, the evolution of geochemical reservoirs and ore formation, controlled by physicochemical conditions at the crust‐mantle interface.…

A fast open data reduction workflow for the electron microprobe flank method to determine Fe3+/ΣFe contents in minerals Open

Dominik C. Hezel, Heidi E. Höfer, Andreas Fichtner · 2023

Knowing the Fe 3+ /SFe ratio in minerals is important to understand the formation and evolution of minerals and their host rocks.Variable Fe 3+ /SFe in e.g., garnet is accompanied by a change of their characteristic FeLa and FeLb X-ray emi…

A new web-based and open data reduction application to determine Fe2+/Fe3+ ratios using the electron microprobe flank method. Open

Dominik C. Hezel, Heidi E. Höfer, Andreas Fichtner · 2023

The electron microprobe (EPMA) flank method can be used to determine in-situ the Fe2+/Fe3+ ratios in garnet [1], and potentially also in other minerals. It is a tool to reveal the redox history of rocks, especially when the garnet grain si…

A web-based, open tool for the preparation and data reduction of electron microprobe measurements. Open

Dominik C. Hezel, Heidi E. Höfer · 2023

Behaviour of S and Fe during multi-stage metasomatism of oceanic crust as revealed by eclogite xenoliths from the Colorado Plateau Open

Sonja Aulbach, Heidi E. Höfer, Richard M. Stern, Daniel Schulze, Herwart Helmstaedt · 2022

Accessories in Kaiserstuhl carbonatites and related rocks as accurate and faithful recorders of whole rock age and isotopic composition Open

Mahdi Ghobadi, Gerhard P. Brey, Axel Gerdes, Heidi E. Höfer, Jörg Keller · 2021

The accessories perovskite, pyrochlore, zirconolite, calzirtite and melanite from carbonatites and carbonate-rich foidites from the Kaiserstuhl are variously suited for the in situ determination of their U–Pb ages and Sr, Nd- and Hf-isotop…

Oxidation state and metasomatism of the lithospheric mantle beneath the Rae Craton, Canada: strong gradients reflect craton formation and evolution Open

Alan B. Woodland, Carolin Gräf, Theresa Sandner, Heidi E. Höfer, Hans-Michael Seitz , et al. · 2021

We present the first oxidation state measurements for the subcontinental lithospheric mantle (SCLM) beneath the Rae craton, northern Canada, one of the largest components of the Canadian shield. In combination with major and trace element …

Chemical geodynamics with eclogite - <i>P. Gast Medal Lecture</i> Open

Sonja Aulbach, Nicholas Arndt, Axel Gerdes, Larry M. Heaman, Heidi E. Höfer , et al. · 2021

Breyite inclusions in diamond: experimental evidence for possible dual origin Open

Alan B. Woodland, A. V. Girnis, V. K. Bulatov, Gerhard P. Brey, Heidi E. Höfer · 2020

Inclusions of breyite (previously known as walstromite-structured CaSiO3) in diamond are usually interpreted as retrogressed CaSiO3 perovskite trapped in the transition zone or the lower mantle. However, the thermodynamic stability field o…

ROME'S Rise to Power. Geochemical Analysis of Silver Coinage from the Western Mediterranean (Fourth to Second Centuries BCE) Open

Katrin Westner, Thomas Birch, Fleur Kemmers, Sabine Klein, Heidi E. Höfer , et al. · 2020

We present the results of geochemical analysis of silver coinage issued by Rome and dated between the fourth and second century BCE, which are complemented by data of coinage issued by Carthage, the Brettii, and the Greek colony of Emporio…

Retracing Magna Graecia's silver: coupling lead isotopes with a multi‐standard trace element procedure Open

Thomas Birch, Katrin Westner, Fleur Kemmers, Sabine Klein, Heidi E. Höfer , et al. · 2019

This study presents the results of compositional and lead isotopic analysis of coinage issued by the Greek colonies of Syracuse, Metapontum, Taras and Thurium in the fifth to third centuries bce . The data suggest that each colony in Magna…

Iron oxidation state of mantle minerals determined from L emission spectra by the electron microprobe Open

Heidi E. Höfer, Gerhard P. Brey, Alan B. Woodland, Pyroxenes Kimberley · 2019

Oxygen fugacities of the metasomatizing melt in a polymict peridotite from Kimberley Open

Heidi E. Höfer, Marina Lazarov, Gerhard P. Brey, Alan B. Woodland · 2019

Redox state of Archean kyanite/corundum eclogites and garnet pyroxenites from Bellsbank, South Africa Open

Heidi E. Höfer, Gerhard P. Brey, Qiao Shu, Christian Heckel, Prokopiy Vasilyev · 2019

Determination of garnet oxidation state using Mössbauer, XANES and the flank method Open

Andrew J. Berry, Alan B. Woodland, Gregory M. Yaxley, Heidi E. Höfer · 2019

Electron microprobe technique for the determination of iron oxidation state in silicate glasses Open

Chao Zhang, Renat Almeev, Ery Hughes, А. А. Борисов, Eric P. Wolff , et al. · 2018

We present a new calibration for the determination of the iron oxidation state in silicate glasses by electron probe microanalysis (EPMA) with the "flank method." This method is based on the changes in both intensity and wavelength of the …

Formation of abiotic hydrocarbon from reduction of carbonate in subduction zones: Constraints from petrological observation and experimental simulation Open

Renbiao Tao, Lifei Zhang, Meng Tian, Jianjiang Zhu, Xi Liu , et al. · 2018

Subduction is a key process for linking the carbon cycle between the Earth's surface and its interior. Knowing the carbonation and decarbonation processes in the subduction zone is essential for understanding the global deep carbon cycle. …

Volatile-rich Metasomatism in the Cratonic Mantle beneath SW Greenland: Link to Kimberlites and Mid-lithospheric Discontinuities Open

Sonja Aulbach, Jing Sun, Sebastian Tappe, Heidi E. Höfer, Axel Gerdes · 2017

The cratonic part of Greenland has been a hotspot of scientific investigation since the discovery of some of the oldest crust on Earth and of significant diamond potential in the underlying lithospheric mantle, the characterization of whic…

Heidi E. Höfer YOU? Author Swipe