Oxygen isotopic and petrographic evidence relevant to the origin of the Arkansas Novaculite.

D. L. Jones, L. P. Knauth

Research output: Contribution to journalArticle

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O18 values for 73 chert samples from the Arkansas Novaculite (Devonian-Mississippian) range from +17.8% to 33.7%. Much of this variation is related to the effects of local metamorphism and isotopic impurities such as detrital quartz and clay minerals. Petrographic and SEM examination of the O18-rich W. samples reveal well preserved early diagenetic textures including abundant relict opal-CT lepispheres (now replaced by microquartz). Radiolaria and sponge spicules show well preserved morphologies. Samples from E. localities display no evidence of early diagenetic textures, and radiolaria and sponge spicules are preserved only as petrographic ghosts. The isotopic and petrographic data can be interpreted in terms of a siliceous biogenic ooze deposited in environments ranging from supratidal to open marine. -from Authors

Original languageEnglish (US)
Pages (from-to)581-598
Number of pages18
JournalJournal of Sedimentary Petrology
Issue number2
StatePublished - Jan 1 1979


ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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