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Earthquakes, volcanoes, mountain building, ice ages, landslides, floods, life evolution, plate motions—all of these phenomena have interacted over the vast expanses of deep time to sculpt the dynamic planet that we live on today. Planet Earth presents an overview of several aspects of our home, from a geological perspective. We begin with earthquakes—what they are, what causes them, what effects they have, and what we can do about them.
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The Precambrian basement rocks of the Eastern Granite-Rhyolite Province EGRP in central Illinois midcontinent region of North America exhibit a complex history of early volcanism, granite emplacement, and intrusion of mafic rocks. A comprehensive suite of dedicated petrographic analyses, geophysical logs, and drill core from four basement-penetrating wells, two-dimensional and three-dimensional seismic reflection data, and U-Pb age data from the Illinois Basin—Decatur Project IBDP and Illinois Carbon Capture Storage ICCS Project site provide new constraints for interpreting the Precambrian basement of the Illinois Basin.
These new data reveal the basement to be compositionally and structurally complex, having typical EGRP felsic volcanic rocks intruded by the first reported gabbro in the Precambrian basement in Illinois. A high-resolution three-dimensional seismic reflection volume, coincident with the four wells, provides a context for interpreting the petrological data and implies a high degree of heterogeneity for basement rocks at the IBDP—ICCS site, as also shown by the drill cores.
The occurrence of Grenville-age gabbro is related to a prominent bowl-like structure observed on local two-dimensional seismic reflection profiles and the three-dimensional volume that is interpreted as a deep-seated mafic sill complex.
View PDF Download full issue. Author links open overlay panel Jared T. Freiburg a b John H. McBride c David H. Malone d Hannes E. Leetaru a. Add to Mendeley Share.
Under a Creative Commons. Abstract The Precambrian basement rocks of the Eastern Granite-Rhyolite Province EGRP in central Illinois midcontinent region of North America exhibit a complex history of early volcanism, granite emplacement, and intrusion of mafic rocks.
Keywords Eastern granite-rhyolite province. Abbreviations 2D two-dimensional. FMI log fullbore microimager log.
MCR Midcontinent Rift. MSWD mean square weighted deviation. VW1 Verification Well 1. VW2 Verification Well 2.
WMA weighted mean age. Recommended articles Citing articles 0.
Peer-review under responsibility of China University of Geosciences Beijing. Production and hosting by Elsevier B.