| 释义 |
hornfels, n. Petrogr.|ˈhɔːnfɛls|
[a. G. hornfels, f. horn horn + fels rock.]
A fine-grained, non-schistose rock composed mainly of quartz, micas, and feldspars and formed by the contact metamorphism of an argillaceous rock. Hence hornˈfelsic a., composed of, or having the character of, hornfels.
1854Dana Syst. Min. (ed. 4) II. 246 The Hornfels of the Germans is a massive compound of quartz and feldspar breaking with a smooth flinty fracture. 1888J. J. H. Teall Brit. Petrogr. xii. 374 We use the term hornfels instead of its etymological equivalent, hornstone, because in many cases the rocks termed hornfels are distinctly crystalline and not at all like what is commonly termed hornstone in this country. 1951Turner & Verhoogen Igneous & Metamorphic Petrol. xv. 373 Structure is typically granoblastic (hornfelsic) or maculose. 1965G. J. Williams Econ. Geol. N.Z. vii. 73/2 The conglomerates are quartzose in some places, and elsewhere contain granite, greywacke and hornfelsic components.
So ˈhornfels v. trans., to metamorphose (a rock) to hornfels; ˈhornfelsed |-fɛlst, -fɛlzd| ppl. a., ˈhornfelsing vbl. n.
1901Rep. Brit. Assoc. 634 The Old Red Sandstone is indurated and often hornfelsed to a varying distance from the margin. 1922Nature 12 Jan. 62/1 Hornfelsed green rocks. 1930Peach & Horne Geol. Scotl. ii. 70 The hornfelsing of the orthogneisses. 1947Q. Jrnl. Geol. Soc. CII. 395 The hornfelsed graywacke is slightly silicated. 1970G. Newall et al. Mechanism of Igneous Intrusion iv. 49 The granite is in contact with hornfelsed pillow lavas. |