单词 | allothigenic |
释义 | allothigenicadj. Geology. Of a mineral: older than the rock or deposit of which it forms part (cf. allogenic adj. 1). Contrasted with authigenic adj. ΘΚΠ the world > the earth > minerals > types of mineral > [adjective] > other general types allothigenic1888 femic1902 1888 F. H. Hatch in J. J. H. Teall Brit. Petrogr. 423 Allogenic (Allothigenic), applied to such minerals as are of more ancient origin than the rocks which they compose. 1908 H. Kynaston & J. B. Hill Geol. Country Oban & Dalmally vi. 50 While to the south of this sheet the clastic nature of these rocks is apparent, in the Glen Fyne area the allothigenic constituents have disappeared. 1981 T. N. Kheraskova in M. J. Hambrey & W. B. Harland Earth's Pre-Pleistocene Glacial Rec. (2011) 351/2 The hydromica was probably formed by alteration of allothigenic biotite. 2004 V. I. Osipov et al. Clay Seals of Oil & Gas Deposits i. 3 The basis of the mineral part is made up of allothigenic and authigenic minerals. This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021). < adj.1888 |
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