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Download e-book for kindle: Amphiboles: Crystal Chemistry Phase Relations and Occurrence by W. G. Ernst

By W. G. Ernst

ISBN-10: 3642461387

ISBN-13: 9783642461385

ISBN-10: 3642461409

ISBN-13: 9783642461408

This sequence of monographs represents continuation on a world foundation of the former sequence MINERALOGIE UNO PETROGRAPHIE IN EINZELOARSTELLUNGEN, released through Springer-Verlag. The voluminous effects coming up from fresh growth in natural and utilized re­ seek elevate the necessity for authoritative stories however the commonplace medical journals are not able to supply the distance for them. by means of their very nature, text-books are not able to think about particular subject matters extensive and up to date study met'hods and effects frequently obtain in basic terms cursory deal with­ ment. complex reference volumes are typically too targeted 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 overview bankruptcy surrounded via unrelated chapters. we are hoping that this monograph sequence will by-pass those difficulties in gratifying the necessity. the aim of the sequence is to put up, at moderate costs, stories and reviews of care­ totally chosen subject matters written through conscientiously chosen authors, who're either solid writers and specialists of their clinical box. ordinarily, the mono­ graphs could be all in favour of the newest examine tools and effects. The editors desire that the monographs will serve numerous capabilities, performing as supplementations to latest text-books, guiding study employees, and offering the foundation for complicated 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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Additional resources for Amphiboles: Crystal Chemistry Phase Relations and Occurrence

Sample text

HINRICHSEN (1966) employed sealed double capsules and the magnetiteiron and magnetite-wiistite oxygen buffers. For all these experiments, equilibration between the fluid phase and the contrasting charge assemblages characteristic of different temperatures (and also due to reaction with the buffer where used) would be expected to influence the fugacities ... D 0 ~ ... (l) :::J if) if) ... (l) 0.. 10 Temperature,OC Figure 21 Schematic Pfluid·T diagram for the system MgO·Si02·H20 (Greenwood, 1963).

19a, departure of rock bulk composition from that of the amphibole itself reduces the thermal stability limit of the amphibole. On the other + + + + (b) (0) G + G Figure 19 Isobaric Gibbs free energy· temperature diagrams illustrating the influence of changing composition of the system on the thermal stability limit of a pure phase. Metastable curve extensions are shown as short dashes. T 1 = isobaric high tem· perature stability limit of tremolite in a rock of its own bulk composition, T 2 = isobaric high temperature stability limit of tremolite in a system (a) undersaturated with respect to silica and (b) with fluid phase empoverished in H20.

Three-amphibole compatibilities are unknown to the writer, but coexisting pairs include Ca-(Fe+Mg), Ca-Na and rarely, Na-(Fe+Mg) amphiboles; thus the three major groups of amphiboles are indeed chemically distinct, and separated from one another by two phase-fields. In addition, occurrences of two calcic amphiboles provide evidence of a solvus within the Ca group, and the association of cummingtonite with anthophyllite or gedrite demonstrates the presence of a solvus within the compositional range of the Fe-Mg group,-again assuming that the assemblages are stable.

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


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