| 释义 |
poikilitic, a.|pɔɪkɪˈlɪtɪk|
Also poic-.
[var. of pœcilitic.]
†1. Geol. (Usu. with capital initial.) A term formerly applied to the Triassic and Permian systems, as being mainly composed of variegated rocks. Obs.
1836Buckland Geol. & Min. II. 38 The word Pœcilitic is in sound so like to Pisolite, that it may be better to adhere more literally to the Greek root ποικίλος, and apply the common name of Poikilitic group to the strata in question. 1846H. T. De la Beche in Mem. Geol. Surv. Gt. Brit. I. 239 Poicilitic or New Red Sandstone Series. 1861Eng. Wom. Dom. Mag. III. 59 The reconstruction of the cretaceous, poikilitic, oolitic, or silurian landscape, peopled with revivified Batrachians. 1885Geikie Text-Bk. Geol. (ed. 2) 748 The term ‘Poikilitic’ was formerly proposed for them, on account of their characteristic mottled appearance.
2. Petrogr. Applied to the structure or texture of a rock (now only an igneous rock), or to the rock itself, in which small crystals of one mineral are enclosed within crystals of another. Cf. pœcilitic a. 2.
1886G. H. Williams in Amer. Jrnl. Sci. CXXXI. 30 This structure is so common in many massive rocks, especially in the more basic kinds, that I would venture to suggest the use of the term ‘poicilitic’ (derived from the Greek ποικίλος, mottled) for it. 1893― in Jrnl. Geol. I. 176 (heading) On the use of the terms poikilitic and micro⁓poikilitic in petrography. Ibid. 177 This term was at first incorrectly spelled poicilitic and subsequently corrected by Prof. Dana to its Latin form, poecilitic... Its preferable orthography is, however, that given above [sc. poikilitic]. At the time it was proposed the writer was not familiar..with the designations..poecilitic and poikilitic, given successively..to the ‘New Red’ sandstone. 1920[see poikiloblastic adj. s.v. poikilo-]. 1923Jrnl. Geol. XXXI. 177 The feldspar grains of the arkose are set, in a sort of poikilitic fashion, in a matrix of much more coarsely crystalline quartz. 1954H. Williams et al. Petrography ii. 19 (caption) Poikilitic texture in hornblende peridotite, Odenwald, Germany. 1970Nature 25 July 366/1 The poikilitic chromitite harzburgite..could well be formed from dunite by permeation by silica-bearing solutions.
Hence poikiˈlitically adv.
1912Meddelelser om Grønland XXXVIII. 150 Each anhedron encloses a large number of sodalite-crystals poikilitically. 1932F. F. Grout Petrogr. & Petrol. vi. 371 Less commonly some rounded granules in a hornfels may be enclosed in a coarser mineral developed poikilitically. 1963W. A. Deer et al. Rock-Forming Min. IV. 263 Kalsilite..occurs as an interstitial mineral poikilitically enclosing the ferromagnesian constituents. |