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X?ray measurements on some plagioclases from the Mt Davies intrusion, South Australia

X?ray measurements on some plagioclases from the Mt Davies intrusion, South Australia
X?ray measurements on some plagioclases from the Mt Davies intrusion, South Australia
An X-ray determinative curve, based on the parameter (Smith & Gay, 1958) has been derived from twelve analysed plagioclases in the range An62-87. The line differs from previous calibrations of against anorthite content, and it is suggested that this is due to the differing thermal histories of the materials used. A break in slope in the determinative line at about An75 may correspond to the change in lattice type from low intermediate plagioclase, to "body centred" anorthite. Heating of the plagioclases results in an increase in I' and the disappearance of the discontinuity.
0812-0099
39-42
Kleeman, J.D.
53ce7422-520e-4af4-9276-12240568ce8c
Nesbitt, R.W.
6a124ad1-4e6d-4407-b92f-592f7fd682e4
Kleeman, J.D.
53ce7422-520e-4af4-9276-12240568ce8c
Nesbitt, R.W.
6a124ad1-4e6d-4407-b92f-592f7fd682e4

Kleeman, J.D. and Nesbitt, R.W. (1967) X?ray measurements on some plagioclases from the Mt Davies intrusion, South Australia. Journal of the Geological Society of Australia, 14 (1), 39-42. (doi:10.1080/00167616708728643).

Record type: Article

Abstract

An X-ray determinative curve, based on the parameter (Smith & Gay, 1958) has been derived from twelve analysed plagioclases in the range An62-87. The line differs from previous calibrations of against anorthite content, and it is suggested that this is due to the differing thermal histories of the materials used. A break in slope in the determinative line at about An75 may correspond to the change in lattice type from low intermediate plagioclase, to "body centred" anorthite. Heating of the plagioclases results in an increase in I' and the disappearance of the discontinuity.

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Published date: 1967
Organisations: Geochemistry

Identifiers

Local EPrints ID: 361897
URI: https://eprints.soton.ac.uk/id/eprint/361897
ISSN: 0812-0099
PURE UUID: ee766a1f-8937-4ab8-aa48-2d9ba457f1e6

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Date deposited: 05 Feb 2014 13:48
Last modified: 18 Jul 2017 02:57

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