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

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 bobbing up from fresh development in natural and utilized re­ seek bring up the necessity for authoritative experiences however the normal clinical journals are not able to supply the gap for them. by means of their very nature, text-books are not able to think about particular issues extensive and up to date study met'hods and effects usually obtain purely cursory deal with­ ment. complicated reference volumes tend to be too certain aside from 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 assessment 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 post, at average costs, stories and experiences of care­ totally chosen issues written by means of conscientiously chosen authors, who're either stable writers and specialists of their medical box. more often than not, the mono­ graphs should be all for the latest examine equipment and effects. The editors desire that the monographs will serve a number of services, appearing as supplementations to present text-books, guiding examine employees, and supplying 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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Sample text

The buffer technique of EUGSTER (1957, 1959) has been employed routinely to define values of f02 . This method requires that the charge capsule (a container consisting of a metal permeable to hydrogen) be surrounded by an oxygen buffer assemblage H 20 in an outer capsule (the container metal being nearly impermeable to H 2). Equilibration of the oxygen buffer assemblage and fluid defines fugacities of hydrogen and oxygen in the outer capsule; through diffusion of the H2, the fH2 and hence the f02 of the inner capsule are controlled through the dissociation of H 20.

The reactions considered are: + + + + + + + + + + (1) tremolite = 2 diopside 3 enstatite quartz H20; (2) tremolite 3 calcite 2 quartz = 5 diopside 3C02 H20; (3) 5 dolomite 7 quartz H 20 = tremolite 3 calcite 7C02; and (4) serpentine 9 calcite 5C02 = tremolite 7 dolomite 7H20. Reaction (1) is a simple dehydration reaction, and is the one experimentally determined by BOYD (1959) under conditions where the fluid phase is virtually pure H20; dilution by C02 would necessitate a decreased thermal stability range for the hydrous silicate, as discussed previously.

I 1000 I / 600 / / 00 / / / / / / 700 •• 800 Tempera ture ,oG Figure 20 Experimentally determined phase equilibria for the system MgO-Si02-H20 under conditions where Pfluid = Ptotal (Greenwood, 1963). Arrows indicate direction from which equilibrium was approached. Curve (1) represents the low temperature stability limit of anthophyllite, curve (4) the high temperature stability limit. Abbreviations are as follows: F = Fo = forsterite; T = Ta = talc; E = En = enstatite; A = Anth = anthophyllite; Q = quartz.

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