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Title:K-Metasomatism in Uppermost Precambrian Rocks in West-Central Wisconsin and Southeastern Missouri
Author(s):Liu, Junzhe
Doctoral Committee Chair(s):Hay, Richard L.
Department / Program:Geology
Discipline:Geology
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Geology
Abstract:K/Ar dating of different size fractions of I/S samples reveals three episodes of illitization in the alteration profiles: 432-424 Ma, 410-383 Ma, and ${\sim}{-}314$ Ma. Rb-Sr and oxygen isotopic data suggest I/S of the 432-424 episode may have formed from the same fluids that formed the coarse-grained authigenic K-feldspar at 448-424 Ma. The most likely fluids for I/S of the younger episodes are basinal brines either driven by gravity or expelled by continental collisions during the Acadian and Alleghanian orogenies. However, sources and pathways of such fluids are yet to be determined.
Issue Date:1997
Type:Text
Language:English
Description:227 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997.
URI:http://hdl.handle.net/2142/86545
Other Identifier(s):(MiAaPQ)AAI9737180
Date Available in IDEALS:2015-09-28
Date Deposited:1997


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