An authigenic mineral or sedimentary rock deposit is one that was generated where it is found or observed. Authigenic sedimentary minerals form during sedimentation by precipitation or recrystallization instead of being transported from elsewhere (allogenic) by water or wind. Authigenic sediments are the main constituents of deep sea sedimentation...
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http://en.wikipedia.org/wiki/Authigenic
Formed or generated in place; specif. said of rock constituents and minerals that have not been transported or that crystallized locally at the spot where they are now found, and of minerals that came into existence at the same time as, or subsequently to, the formation of the rock of which they constitute a part. The term, as used, often refers to...
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http://www.encyclo.co.uk/local/22047
(of a constituent of a rock) formed in the rock where it is found. Cf. allogenic (def. 1).
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https://www.infoplease.com/dictionary/authigenic
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