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Title:Origin and Diagenesis of Lacustrine Sediments of the Late Oligocene Creede Formation, Southwestern Colorado
Author(s):Finkelstein, David Barry
Doctoral Committee Chair(s):Altaner, Stephen P.
Department / Program:Geology
Discipline:Geology
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Geology
Abstract:Vertically-zoned sequences of authigenic silicates in tuffs reflect alteration of silicic-intermediate vitric tuff within an elevated geothermal gradient (90$\sp\circ$-150$\sp\circ$C/km). The abundance of clinoptilolite - Al-smectite in drillcore CCM-2 is consistent with diagenetic waters having low to moderate salinity and a pH of 7-9. The higher-grade mineral assemblage (analcime, K-feldspar, quartz, interstratified illite/smectite and chlorite/smectite in CCM-1) is due to hotter fluids migrating through the more permeable strata. Alteration occurred in a relatively closed system. On the basis of studies of zeolite formation in other burial diagenetic systems, the observed authigenic silicate assemblage in tuffs of the Creede Formation must have formed within $\sim$3-4 m.y. of deposition.
Issue Date:1997
Type:Text
Language:English
Description:144 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997.
URI:http://hdl.handle.net/2142/86547
Other Identifier(s):(MiAaPQ)AAI9812586
Date Available in IDEALS:2015-09-28
Date Deposited:1997


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