Photo-Emission Electron Microscopy (PEEM) Heating Investigations of a Natural Amphibole Sample.

Wartho, Jo-Anne (1995) Photo-Emission Electron Microscopy (PEEM) Heating Investigations of a Natural Amphibole Sample. Mineralogical Magazine, 59 (394). pp. 121-127. DOI 10.1180/minmag.1995.59.394.12.

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Abstract

PEEM allows ‘real-time’ observations to be made of solid-state transformations and other high-temperature processes taking place during vacuum-heating up to c. 2000°C The solid state transformations of an amphibole-rich hornblendite specimen have been observed in the temperature range of 750–1000°C (± 50°C Between c. 970–990°C a rapid change in orientation contrast was observed, indicating a structural rearrangement from an oxyhornblende crystal lattice to a clinopyroxene structure. This phase retains the original amphibole shape and texture (including two 120°C intersecting cleavage traces), but possesses a clinopyroxene crystal structure. At higher temperatures this phase is seen to decompose, forming iron oxides and other fine-grained products. PEEM has provided useful information on both the nature and rates of transformation of natural amphiboles which has proved invaluable in our understanding of the mineralogically-controlled mechanisms of argon release during 40Ar/39Ar dating of amphibole samples.

Document Type: Article
Keywords: Photo-emission electron microscopy; vacuum-heating; amphiboles; solid state transformations
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1180/minmag.1995.59.394.12
ISSN: 0026-461X
Date Deposited: 24 Nov 2015 10:29
Last Modified: 24 Nov 2015 10:29
URI: http://oceanrep.geomar.de/id/eprint/30293

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