By W. G. Ernst
This sequence of monographs represents continuation on a global foundation of the former sequence MINERALOGIE UNO PETROGRAPHIE IN EINZELOARSTELLUNGEN, released by means of Springer-Verlag. The voluminous effects bobbing up from contemporary growth in natural and utilized re seek raise the necessity for authoritative studies however the normal medical journals are not able to supply the distance for them. by way of their very nature, text-books are not able to think about particular themes extensive and up to date examine met'hods and effects usually obtain purely cursory deal with ment. complicated reference volumes are typically too designated with the exception of specialists within the box. it's always very dear to buy a symposium quantity or an "Advances in . . . " quantity for the sake of a particular evaluation bankruptcy surrounded through unrelated chapters. we are hoping that this monograph sequence will by-pass those difficulties in satisfying the necessity. the aim of the sequence is to submit, at average costs, stories and studies of care totally chosen subject matters written through conscientiously chosen authors, who're either sturdy writers and specialists of their medical box. generally, the mono graphs could be keen on the newest study equipment and effects. The editors desire that the monographs will serve numerous features, appearing as vitamins to latest text-books, guiding learn staff, and delivering 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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Additional info for Amphiboles: Crystal Chemistry Phase Relations and Occurrence
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.
Iron + quartz + + fluid 1 , ,, , , , 'A -3~o~o~------~4~~~O~------~5~O~O~~----~5~50=--------6~O~O~-------6~5LO~-------7~OO Temperature in °C Figure 30 Isobaric log fo 2 ·T diagram for the ferrotremolite bulk composition at 3000 bars fluid pressure (Ernst, 1966). Field boundaries are dashed where calculated or inferred. Field boundaries (1), (4) and (8) coincide with buffer curves of the same numbers shown in Fig. 17.
Compositional distinction among the three major groups of amphiboles is reasonably well shown. However, the nature of the ions occupying all of the other structural positions and physical conditions of crystallization as well, undoubtedly influence the cation variation presumed within M4; because these additional complications have not been considered, relations depicted in Fig. 13 have only semi-quantitative value at best. Richterites, although relatively poor in alumina, are compositionally intermediate between sodic and calcic amphiboles, and so obscure the solvus relations.