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Geology; December 2001; v. 29; no. 12; p. 1067-1070; DOI: 10.1130/0091-7613(2001)029<1067:RFMITI>2.0.CO;2
© 2001 Geological Society of America
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Regional fluid migration in the Illinois basin: Evidence from in situ oxygen isotope analysis of authigenic K-feldspar and quartz from the Mount Simon Sandstone

Zhensheng Chen1, Lee R. Riciputi2, Claudia I. Mora3 and Neil S. Fishman4

1 Department of Geological Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA
2 Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3 Department of Geological Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA
4 U.S. Geological Survey, Denver, Colorado 80225, USA

Oxygen isotope compositions of widespread, authigenic K-feldspar and quartz overgrowths and cements in the Upper Cambrian Mount Simon Sandstone were measured by ion microprobe in 11 samples distributed across the Illinois basin and its periphery. Average K-feldspar {delta}18O values increase systematically from +14{per thousand} ± 1{per thousand} in the southernmost and deepest samples in Illinois to +24{per thousand} ± 2{per thousand} in the northernmost outcrop sample in Wisconsin. A similar trend was observed for quartz overgrowths (22{per thousand} ± 2{per thousand} to 28{per thousand} ± 2{per thousand}). Constant homogenization temperatures (100–130 °C) of fluid inclusions associated with quartz overgrowths throughout the basin suggest that the geographic trend in oxygen isotope compositions is a result of diagenetic modification of a south to north migrating basinal fluid.

Key Words: ion probe • oxygen • isotopes • authigenic minerals • Illinois basin • fluid migration




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