Henrietta E. Cathey
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View article: Automated, Not Autonomous: Integrating Automated Mineralogy with Complementary Techniques to Refine and Validate Phase Libraries in Complex Mineral Systems
Automated, Not Autonomous: Integrating Automated Mineralogy with Complementary Techniques to Refine and Validate Phase Libraries in Complex Mineral Systems Open
Accurate phase identification is essential for characterising complex mineral systems but remains a challenge in SEM-based automated mineralogy (AM) for compositionally variable rock-forming or accessory minerals. While platforms such as t…
View article: Stoichiometry of Bulk Nb1−βSnβ Superconductors Synthesised by Arc Melting
Stoichiometry of Bulk Nb1−βSnβ Superconductors Synthesised by Arc Melting Open
We present an alternative process for production of binary Nb1−βSnβ superconducting phases using pre- and post-treatment of arc-melted Nb + Sn ingots. This process combines sequential sintering, arc melting, and annealing procedures that p…
View article: Stoichiometry of Bulk Nb1−βSnβ Superconductors Synthesised by Arc Melting
Stoichiometry of Bulk Nb1−βSnβ Superconductors Synthesised by Arc Melting Open
We present an alternative process for production of binary Nb1−βSnβ superconducting phases using pre- and post-treatment of arc melted Nb+Sn ingots. This process combines sequential sintering, arc melting, and annealing procedures that pro…
View article: The 2019 pumice raft forming eruption of Volcano-F (Volcano 0403–091) and implications for hazards posed by submerged calderas
The 2019 pumice raft forming eruption of Volcano-F (Volcano 0403–091) and implications for hazards posed by submerged calderas Open
Low volcanic explosivity index (VEI) eruptions are common occurrences in the Southwest Pacific but, as demonstrated by the 2021/2022 eruption of Hunga Volcano, submerged calderas in the region are also capable of producing much larger and …
View article: Geochemistry of indium in magmatic-hydrothermal tin and sulfide deposits of the Herberton Mineral Field, Australia
Geochemistry of indium in magmatic-hydrothermal tin and sulfide deposits of the Herberton Mineral Field, Australia Open
The Herberton Mineral Field in Northeast Australia hosts world class magmatic-hydrothermal Sn–W polymetallic deposits that are enriched in In. The Baal Gammon and Isabel deposits from the Herberton Mineral Field contains early tin, as cass…
View article: Petrogenesis of Havre Volcano in the Kermadec Arc: 2012 Eruption of a Chemically Homogeneous Rhyolite
Petrogenesis of Havre Volcano in the Kermadec Arc: 2012 Eruption of a Chemically Homogeneous Rhyolite Open
The 2012 Havre submarine eruption produced a 1.5 km 3 bulk rock volume or 0.52 km 3 dense rock equivalent volume of rhyolite emplaced as minor lava flows, a field of sunken seafloor pumice, and a volumetrically dominant pumice raft. This m…
View article: Havre 2012 pink pumice is evidence of a short-lived, deep-sea, magnetite nanolite-driven explosive eruption
Havre 2012 pink pumice is evidence of a short-lived, deep-sea, magnetite nanolite-driven explosive eruption Open
The Havre 2012 deep-sea rhyolite eruption went unobserved and was initially recognised from a massive pumice raft at the sea surface. Havre pumices are predominantly white or grey, however pink pumice is common in the raft. In subaerial ex…
View article: Defining Pre-eruptive Conditions of the Havre 2012 Submarine Rhyolite Eruption Using Crystal Archives
Defining Pre-eruptive Conditions of the Havre 2012 Submarine Rhyolite Eruption Using Crystal Archives Open
The 2012 Havre eruption evacuated a crystal-poor rhyolite (∼3–7% crystals) producing a volumetrically dominant (∼1.4 km3) pumice raft, as well as seafloor giant pumice (5–8%) and lavas (12–14%) at the vent (∼0.1 km3), both of which have su…
View article: Stoichiometry of tetragonal and hexagonal Fe<sub>x</sub>Se: phase relations
Stoichiometry of tetragonal and hexagonal Fe<sub>x</sub>Se: phase relations Open
Precise compositional analyses at spatial resolution 690 °C with annealing at 420 °C for ∼24 h. We define a modified phase diagram that includes this two phase field with β-Fe x Se and δ-Fe x Se for 1.02 < x < 0.90 and a second two phase …
View article: (U‐Th)/He zircon dating of Chesapeake Bay distal impact ejecta from ODP site 1073
(U‐Th)/He zircon dating of Chesapeake Bay distal impact ejecta from ODP site 1073 Open
Single crystal (U‐Th)/He dating has been undertaken on 21 detrital zircon grains extracted from a core sample from Ocean Drilling Project (ODP) site 1073, which is located ~390 km northeast of the center of the Chesapeake Bay impact struct…
View article: Detailed mineralogical investigation of Australian natural zeolite using EPMA
Detailed mineralogical investigation of Australian natural zeolite using EPMA Open
Summary - Improved spatial resolution for quantitative analysis of zeolite particles <<20 μm can be achieved using field-emission electron probe microanalysis (FE-EPMA) under special conditions (10kV accelerating voltage, 5nA beam current,…
View article: Single Step Process for Crystalline Ni-B Compounds
Single Step Process for Crystalline Ni-B Compounds Open
Crystalline Ni2B, Ni3B, and Ni4B3 are synthesized by a single-step method using autogenous pressure from the reaction of NaBH4 and Ni precursors. The effect of reaction temperature, pressure, time, and starting materials on the composition…
View article: Synthesis of Magnesium Nickel Boride Aggregates via Borohydride Autogenous Pressure
Synthesis of Magnesium Nickel Boride Aggregates via Borohydride Autogenous Pressure Open
We demonstrate synthesis of the ternary intermetallic MgNi3B2 using autogenous pressure from the reaction of NaBH4 with Mg and Ni metal powder. The decomposition of NaBH4 to H2 and B2H6 commences at low temperatures in the presence of Mg a…
View article: Low voltage EPMA: experiments on a new frontier in microanalysis - analytical lateral resolution
Low voltage EPMA: experiments on a new frontier in microanalysis - analytical lateral resolution Open
Field emission (FE) electron gun sources provide new capabilities for high lateral resolution EPMA. The determination of analytical lateral resolution is not as straightforward as that for electron microscopy imaging. Results from two sets…