Amphiboles: Crystal Chemistry Phase Relations and Occurrence by W. G. Ernst

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By W. G. Ernst

This sequence of monographs represents continuation on a world foundation of the former sequence MINERALOGIE UNO PETROGRAPHIE IN EINZELOARSTELLUNGEN, released by way of Springer-Verlag. The voluminous effects bobbing up from contemporary development in natural and utilized re­ seek raise the necessity for authoritative experiences however the regular clinical journals are not able to supply the distance for them. through their very nature, text-books are not able to think about particular issues intensive and up to date learn met'hods and effects frequently obtain in basic terms cursory deal with­ ment. complex reference volumes are typically too precise apart from specialists within the box. it is usually very pricey to buy a symposium quantity or an "Advances in . . . " quantity for the sake of a particular evaluate bankruptcy surrounded via unrelated chapters. we are hoping that this monograph sequence will by-pass those difficulties in enjoyable the necessity. the aim of the sequence is to submit, at moderate costs, reports and reviews of care­ totally chosen subject matters written through rigorously chosen authors, who're either reliable writers and specialists of their clinical box. normally, the mono­ graphs could be fascinated with the newest learn equipment and effects. The editors wish that the monographs will serve a number of features, appearing as vitamins to present text-books, guiding learn staff, and offering the root for complex seminars. August 1967 W. VON ENGELHARDT, Tiibingen T. HAHN, Aachen R. Roy, college Park, Pa. J. W. WINCHESTER, Ann Arbor, Mich. P. J. WYLLIE, Chicago, Ill.

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C: E E 00'0 u" 0; LL + 0' 0020 .. ::E c ::; ..... 050 n/( Mn .. Mg. Fe ) Actlnolr te Figure 14 Fractionation of manganese, iron and magnesium between coexisting actinolites and cummingtonites, metamorphosed iron formation, Quebec (Mueller, 1960). The major element distribution shown in (a) approximates mass action law be· havior; minor element distribution shown in (b) obeys the infinite dilution law. Compositional Variations of the Amphiboles 31 tinction of ferrous and ferric iron. Accordingly exchange equilibria considered involve total iron contents rather than either Fe+2 or Fe+ 3 • Relations are presented in Fig.

These relations are in agreement with the higher temperature crystallization of the Japanese schists compared to the Californian rocks postulated by ERNST and SEKI (1967), based on comparison of mineral assemblages with experimentally determined phase equilibria. Manganese is concentrated in calcic amphiboles relative to sodic amphiboles but, as indicated in Fig. 15b, the data show considerable scatter. Apparently the M4 site in actinolite is slightly *This observation has been documented recently by KLEIN (in press) who presents new electron microprobe analyses of 37 amphibole pairs.

Elevated fco/fH2o ratios, favor the amphibole-bearing assemblage. The T-x relationship of curve + + (I) t \ '\ \~ ~ ~ U'~~ (0<> l( ::l 0 ~ ~ a. 75 Mole Fraction CO2 CO2 Figure 26 Diagrammatic relationships between isobaric equilibria involving tremolite and the composition of a fluid phase consisting of C02 H20 (Greenwood, 1962a). Ideality of mixing in the fluid has been assumed. Abbreviations are: Di = diopside; En = enstatite; Q = quartz; F = fluid; Trem = tremolite; Dol = dolomite; Serp = serpentine; Cc = calcite.

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