| 释义 |
syngenetic, a.|sɪndʒɪˈnɛtɪk|
[f. prec.: see genetic.]
1. Biol. Of or pertaining to syngenesis.
1864Lewes Aristotle xvii. 351 The Syngenetic theory—which makes both parents equally progenitors.
2. Geol. Applied to mineral deposits formed at the same time as the enclosing rocks; characterized by or pertaining to a formation contemporaneous with the enclosing or surrounding rock.
1905J. Geikie Struct. & Field Geol. xvi. 225 Ore-formations may be grouped under these two main divisions:—1. Syngenetic or Contemporaneous, and 2. Epigenetic or Subsequent... Syngenetic ore-formations..are formations of the same age..as the rocks in which they occur. 1914[see epigenetic a. 2]. 1962Geografiska Annaler XLIV. 382/2 The ice-wedges..are clearly ‘syngenetic’..i.e. the frost cracks have extended upwards successively as new sediments were deposited on top. 1971Nature 12 Mar. 108/2 It remains to be seen whether the small amounts of racemic amino-acids were syngenetic with the meteorite parent body or were synthesized later. 1978S. S. Peng Coal Mine Ground Control v. 117 Syngenetic anisotropy originates during the formation processes of rock materials. Bedding planes and preferred alignment of pores or mineral grains are examples.
Hence syngeˈnetically adv.
1951Bull. Amer. Assoc. Petroleum Geologists XXXV. 2226 Apparently the oölites of hematite formed both syngenetically and epigenetically. 1978Nature 19 Oct. 641/1 The Brioverian unicells and colonies are bona fide Precambrian fossils:..they were deposited syngenetically with Precambrian sedimentation. |