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- W2104392340 abstract "Research Article| January 01, 1985 Rb-Sr evidence for punctuated illite/smectite diagenesis in the Oligocene Frio Formation, Texas Gulf Coast JOHN P. MORTON JOHN P. MORTON 1Department of Geological Sciences, University of Texas at Austin, Austin, Texas 78712 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1985) 96 (1): 114–122. https://doi.org/10.1130/0016-7606(1985)96<114:REFPID>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation JOHN P. MORTON; Rb-Sr evidence for punctuated illite/smectite diagenesis in the Oligocene Frio Formation, Texas Gulf Coast. GSA Bulletin 1985;; 96 (1): 114–122. doi: https://doi.org/10.1130/0016-7606(1985)96<114:REFPID>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The <0.05-µ-size fractions of a suite of upper Oligocene Frio Formation shale samples taken from below 10,500 ft in a well on the Texas Gulf Coast fall on a Rb-Sr isochron corresponding to an age of 23.6 ± 0.8 m.y. The isochron shows an initial 87Sr/86Sr ratio of 0.7088 ± 0.0004. This suggests that regularly interstratified illite/smectite simultaneously equilibrated soon after burial over a range of burial depths at 7,000–8,000 ft shallower than at present. Oxygen-isotope values for these clays are also consistent with equilibration under shallower burial conditions. Such a pattern conflicts with the prevailing idea of a gradual illitization of smectite with progressive burial. A new model of episodic or “punctuated” diagenesis is proposed, whereby sudden diagenesis is initiated by a change in pore-water chemistry. Clay reaction occurs over a range of temperature at this time, such that the deeper clays are transformed completely to 80% illite, and the shallow clays are transformed less completely. Subsequent pore-water chemical changes inhibit further clay reaction, and the mineralogic gradient and the isotopic signature formed at 23.6 m.y. B.P. are “frozen in.” Seven to eight thousand feet of additional post-Oligocene burial has not resulted in the creation of younger illite/smectite. Consequently, there is no evidence that illite/smectite diagenesis is currently taking place in the Frio Formation. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2104392340 title "Rb-Sr evidence for punctuated illite/smectite diagenesis in the Oligocene Frio Formation, Texas Gulf Coast" @default.
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