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

By W. G. Ernst

This sequence of monographs represents continuation on a global foundation of the former sequence MINERALOGIE UNO PETROGRAPHIE IN EINZELOARSTELLUNGEN, released through Springer-Verlag. The voluminous effects coming up from fresh development in natural and utilized re­ seek raise the necessity for authoritative experiences however the ordinary medical journals are not able to supply the gap for them. by way of their very nature, text-books are not able to think about particular subject matters extensive and up to date learn met'hods and effects frequently obtain in basic terms cursory deal with­ ment. complex reference volumes are typically too specific with the exception of specialists within the box. it is usually very dear to buy a symposium quantity or an "Advances in . . . " quantity for the sake of a particular evaluation bankruptcy surrounded by means of unrelated chapters. we are hoping that this monograph sequence will by-pass those difficulties in pleasing the necessity. the aim of the sequence is to put up, at average costs, stories and studies of care­ totally chosen issues written via rigorously chosen authors, who're either sturdy writers and specialists of their medical box. ordinarily, the mono­ graphs could be focused on the newest study tools and effects. The editors wish that the monographs will serve numerous services, appearing as supplementations to present text-books, guiding study staff, and delivering the foundation for complex seminars. August 1967 W. VON ENGELHARDT, Tiibingen T. HAHN, Aachen R. Roy, collage Park, Pa. J. W. WINCHESTER, Ann Arbor, Mich. P. J. WYLLIE, Chicago, Ill.

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Amphiboles: Crystal Chemistry Phase Relations and Occurrence

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 coming up from contemporary development in natural and utilized re­ seek elevate the necessity for authoritative studies however the regular clinical journals are not able to supply the distance for them.

Extra info for Amphiboles: Crystal Chemistry Phase Relations and Occurrence

Example text

Reactions were reversed. The amphibole formed was deduced to contain abundant aluminum and ferromagnesian constituents in the proportions Mg65-7oFe35-3o. Oxygen fugacities were not controlled, but apparently approximated those defined by the magnetite + quartz - fayalite buffer due to equilibration between the H20 pressure medium and the bomb walls. ) Because the reacting phases are intermediate solid solutions, the univariant curves presented by AKELLA and WINKLER shown in Fig. ~ Cordierite 1000 500 )( l:l: / 0 700 600 500 800 °C Figure 23 + Experimentally determined Pfluid-T curves for the reactions chlorite quartz = gedrite cordierite H20, and gedrite quartz = hypersthene cordierite H20, employing natural starting materials of atomic proportions Mg56Fe44 (Akella and Winkler, 1966).

Phase Relations and Occurrence of the Calcic Amphiboles 53 (4) respective to both (2) and (3) may not be quite correct; hence this curve is dashed in Fig. 26. Nevertheless, it is topologically satisfactory. Detailed discussions of heterogeneous equilibrium involving multi component fluid phase have been presented recently by GREENWOOD (1967) and by EUGSTER and SKIPPEN (1967). A short note has also been presented by METZ (1967). METZ and WINKLER (1964) have published an experimental isobaric T-x diagram for reaction (2), the conversion of tremolite + calcite + quartz to diopside fluid, as shown in Fig.

22, indicate that synthetic solid solution between oMg7Sis022(OH)2 and °Fe7+2Sis022(OH)2 extends to approximately 60 percent of the iron end-member. For more iron-rich bulk compositions, orthoamphibole is not stable. Similar to the phase relationships for anthophyllite (GREENWOOD, 1963), intermediate members of this series have a thermal range of approximately 100 Co or less. CHOUDHURI and WINKLER (1967) synthesized anthophyllite + hornblende assemblages from an initial charge consisting of natural chlorite, talc, tremolite and quartz; the ferromagnesian components were present in the ratio Mgs4 Fe16 in the starting material.

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