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Atom Probe Tomography Analysis of Exsolved Mineral Phases

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Published on: October 25, 2019

Iron-titanium oxides and olivine from 10020 and 10071.

S E Haggerty, F R Boyd, P M Bell

Science (New York, N.Y.)

|January 30, 1970

Summary

This summary is machine-generated.

A novel mineral related to the pseudobrookite series was discovered. Its crystallization, along with associated minerals, indicates formation under highly reducing conditions with high chromium content in olivine.

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Area of Science:

Mineralogy
Geochemistry
Petrology

Background:

The pseudobrookite mineral series is known from various geological settings.
Understanding crystallization conditions provides insights into ore formation and geological processes.

Purpose of the Study:

To report the discovery and characterization of a new mineral species.
To determine the crystallization conditions of the new mineral and associated phases.
To investigate the presence and state of chromium in coexisting olivine.

Main Methods:

Electron-probe microanalysis (EPMA) for mineral composition.
Optical absorption spectroscopy for mineral studies.
Petrographic analysis of mineral assemblages.

Main Results:

A new mineral with the approximate formula Fe(0.5)Mg(0.5)Ti(2)O(5), related to the pseudobrookite series, was identified.
EPMA revealed coexisting ilmenite and a chromian ulvöspinel-ilmenite assemblage.
Analytical data suggest crystallization occurred under highly reducing conditions.
Olivine within the samples contains exceptionally high chromium concentrations (1400 ppm), likely as Cr(2+).

Conclusions:

The discovery expands the known mineralogy of the pseudobrookite series.
The findings highlight the potential for mineral formation under extreme reducing environments.
The high Cr(2+) in olivine provides a specific indicator for highly reduced magmatic conditions.