| 释义 |
▪ I. exsolution
see exolution.
▪ II. exsolution, n. Geol.|eksəˈl(j)uːʃən|
[f. ex-1 + solution n. Cf. exolution n.]
The segregation and growth of distinct crystal phases within an initially homogeneous solid solution in alloys and some minerals; hence, more widely, the separating out of any phase from a parent composite solution. Also, an instance of this process.
1921H. L. Alling in Jrnl. Geol. XXIX. 222 There is no satisfactory word to express the phenomenon of the separation of two crystal phases due to supersaturation... It is really the opposite of ‘passing into solution’, hence the term ‘exsolution’ is proposed. 1937Mineral. Mag. XXIV. 487 If the optic axial angle is not at a maximum just above the temperature of exsolution, some of the soda-felspar will remain in solid solution, even though cooling through the exsolution range is slow. 1945Ibid. XXVII. 90 Vogt appears to have regarded both vein perthite and microperthite as products of exsolution. 1951Jrnl. Geol. LIX. 481/1 If conditions permit, exsolution will take place in pyroxenes which have crystallized from saturated basaltic magmas. 1969C. Amstutz et al. tr. Ramdohr's Ore Minerals 170 Many exsolutions occur spontaneously as soon as a certain supersaturation is reached, others freeze as ‘non-equilibrium’ mixtures. 1971I. G. Gass et al. Understanding Earth viii. 116/2 The structure is typical of exsolution in an alloy which has cooled very slowly from a high temperature. 1988Nature 22 Sept. 343/1 Isotope studies..do not distinguish between origins by partial melting of the mantle or by exsolution from a phonolitic or nephelinitic magma. |