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authigenic

[aw-thi-jen-ik] /ˌɔ θɪˈdʒɛn ɪk/
adjective, Geology
1.
(of a constituent of a rock) formed in the rock where it is found.
Compare allogenic (def 1).
Origin
1885-1890
1885-90; < German Authigen < Greek authigenḗs native to a specific place (aûthi there + -genēs born) + -ic; see genic
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for authigenic
  • These authigenic minerals provide a record of the prevailing environmental and hydrologic conditions at the time of deposition.
  • These deposits were created in the past and are thought to result from the precipitation of authigenic carbonates.
  • The samples in a and c are well-preserved and contain no authigenic minerals.
  • Any practice recommended to reduce suspended sediment in these waters must take authigenic precipitates into consideration.
  • authigenic overgrowths are scarce, except on the detrital dolomite grains, which frequently have euhedral rhombic overgrowths.
  • Before ascending to the surface, the scientists collected a hand specimen of authigenic carbonate from the seafloor.
  • Occasional grains and veinlets of authigenic pyrite are present.
British Dictionary definitions for authigenic

authigenic

/ˌɔːθɪˈdʒɛnɪk/
adjective
1.
(of minerals) having crystallized in a sediment during or after deposition
Word Origin
C19: from German authigene from Greek authigenēs native + -ic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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