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Amph-IMA97: a hypercard program to determine the name of an amphibole from electron microprobe and wet analyses.

Mogessie, A., Ettinger, K., Leake, B. E. and Tessadri, R. 2001. Amph-IMA97: a hypercard program to determine the name of an amphibole from electron microprobe and wet analyses. Computers and Geosciences 27 (10) , pp. 1169-1178. 10.1016/S0098-3004(01)00034-6

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Abstract

In 1997, the International Mineralogical Association (IMA) revised the amphibole naming scheme making it necessary to amend the previous EMP-AMPH Macintosh program to the new rules. The AMPH-IMA97 program allows single input or automatic input of as many amphibole analyses as are available following a set input format. There are three options for calculation scheme of amphibole analysis: (1) complete chemical analyses can be calculated to 24(O, OH, F, Cl); (2) analyses with determined FeO and Fe2O3 but without H2O can be calculated to 23(O) and (3) electron microprobe analyses with only total Fe determined and without H2O can be calculated to 23(O) with IMA97-recommended normalization for Fe3+ and Fe2+ values. To test the program, over 500 analyses were calculated using the three options. The first comprehensive test of the third option successfully estimated Fe2+ (R2=0.88), but became less successful for Fe3+ (R2=0.42) estimation. Problems in the normalization of Mn3+- and Mn2+-bearing amphiboles and in the IMA97 sodic amphibole classification procedure emerged for Mn-rich amphiboles. This necessitated the proposal and implementation with the program of a simplified sodic amphibole classification scheme. A new coloured amphibole classification chart accompanies the program.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Elsevier
ISSN: 0098-3004
Date of Acceptance: 20 November 2000
Last Modified: 09 Jul 2020 15:00
URI: http://orca.cf.ac.uk/id/eprint/133060

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