By W. G. Ernst
This sequence of monographs represents continuation on a global foundation of the former sequence MINERALOGIE UNO PETROGRAPHIE IN EINZELOARSTELLUNGEN, released via Springer-Verlag. The voluminous effects coming up from fresh development in natural and utilized re seek elevate the necessity for authoritative studies however the general clinical journals are not able to supply the distance for them. through their very nature, text-books are not able to contemplate particular subject matters intensive and up to date study met'hods and effects usually obtain purely cursory deal with ment. complex reference volumes are typically too targeted with the exception of 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 by means of 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 put up, at moderate costs, stories and stories of care totally chosen themes written via rigorously chosen authors, who're either strong writers and specialists of their medical box. normally, the mono graphs can be excited by the latest learn tools and effects. The editors wish that the monographs will serve numerous services, appearing as supplementations to latest text-books, guiding learn employees, and offering the root for complicated 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, sick.
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Extra info for Amphiboles: Crystal Chemistry Phase Relations and Occurrence (Minerals, Rocks and Mountains)
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. + 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.
Moreover, most laboratory syntheses have been performed under conditions where PH20 is maximized; that is, the departure of PH20 from P total = Pfluid arises solely because of contamination of the aqueous phase by constituents present in the amphibole itself. With few exceptions rocks have bulk compositions which Amphiboles 38 deviate to some extent from that of "constituent amphiboles. Furthermore, in some cases a separate fluid phase may not have been present during amphibole crystallization; in certain other instances, although fluid apparently was present, it may have been diluted by components such as CO 2 not present in amphiboles.
However, if E occurs in nature under P-T conditions known to approximate those of the laboratory synthesis, then the reaction A = B C represents metastable equilibrium, not stable equilibrium. In summary, the minimum or stable energy configuration for any specific system cannot be proven; what experimental (and observational) petrologists strive to demonstrate is equilibrium with respect to the phase assemblages studied. + + + + + + + Contrasts in Natural and Synthetic Conditions Almost all experimental determinations of amphibole phase relationships have been carried out utilizing starting materials in stoichiometric propertions to form the pure phase-either as an end-member, or as members of a binary solid solution series.