| 释义 |
petrogeny Petrol.|pɪˈtrɒdʒɪnɪ|
[f. petro- + -geny.]
= petrogenesis. Chiefly in petrogeny's residua system.
1888Teall Petrography Gloss. 448 Petrogeny, that department of geology which treats of the formation of rocks. 1937N. L. Bowen in Amer. Jrnl. Sci. CCXXXIII. 1 It is concluded..that in mixtures containing all of these (SiO2, Al2O3, iron oxide, CaO, MgO, Na2O and K2O) the residual liquid from fractional crystallization will show this same character of great enrichment in alkali-alumina silicate. Since the oxides listed above make up some 97 per cent of the composition of the average igneous rock the alkali-alumina silicate system (NaAlSiO4–KAlSiO4–SiO2) is here referred to as petrogeny's ‘residua system’. 1948[see magmatism a]. 1950E. E. Wahlstrom Introd. Theoret. Igneous Petrol. i. 3 Petrogeny places emphasis on the manner of origin or genesis of rocks. 1966Jrnl. Petrol. VII. 115 It is necessary to know something of the residual liquids that might be produced in the course of crystallization of silicate melts, and a considerable part of the efforts of experimental petrology has been directed to this end. The classic system in this regard is ‘petrogeny's residua system’, NaAlSiO4–KAlSiO4–SiO2..but..even this is a residua system only for liquids in which the alkali/alumina ratio [printed ration] is unity.
Hence petroˈgenic a. = petrogenetic a.
1908Amer. Jrnl. Sci. CLXXVI. 45 In a fully represented petrogenic cycle at a batholithic area..the oldest intrusion should be a rock of gabbroid (basaltic) composition. 1947A. Knopf Pirsson's Rocks & Rock Minerals (ed. 3) vi. 144 A period in which a genetically related series of igneous rocks was formed is called a petrogenic epoch, and as this concept is more definite than ‘petrographic province’, it is supplanting the older idea. 1971I. G. Gass et al. Understanding Earth 12 The rise of understanding of rocks, and particularly of petrogenic processes, was initially highly dependent on the way in which microscopy assisted in the study of the constituent minerals. |