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
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Abstract
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 δ18O values increase systematically from +14‰ ± 1‰ in the southernmost and deepest samples in Illinois to +24‰ ± 2‰ in the northernmost outcrop sample in Wisconsin. A similar trend was observed for quartz overgrowths (22‰ ± 2‰ to 28‰ ± 2‰). 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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | 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 |
| Series title | Geology |
| DOI | 10.1130/0091-7613(2001)029<1067:RFMITI>2.0.CO;2 |
| Volume | 29 |
| Issue | 12 |
| Year Published | 2001 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 4 p. |
| First page | 1067 |
| Last page | 1070 |
| Country | United States |
| State | Illinois, Indiana, Kentucky |
| Other Geospatial | Illinois Basin |
| Google Analytic Metrics | Metrics page |