University of Illinois Urbana-Champaign

K-Metasomatism in Uppermost Precambrian Rocks in West-Central Wisconsin and Southeastern Missouri

Liu, Junzhe

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Description

Title
K-Metasomatism in Uppermost Precambrian Rocks in West-Central Wisconsin and Southeastern Missouri
Author(s)
Liu, Junzhe
Issue Date
1997
Doctoral Committee Chair(s)
Hay, Richard L.
Department of Study
Geology
Discipline
Geology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Geology
Language
eng
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.
Graduation Semester
1997
Type of Resource
text
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