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Geophysical Exploration of the Upper Crust Underlying North-Central Indiana: New Insight into the Eastern Granite-Rhyolite Province

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2018, Master of Science (MS), Wright State University, Earth and Environmental Sciences.
This study analyzes ten 2D seismic lines donated by CountryMark together with potential field data to examine the upper crustal structure near Wabash, Indiana. These seismic profiles reveal significant relief of the Precambrian Unconformity and prominent upper crustal reflections. The Precambrian Unconformity interpreted from the unmigrated stacked seismic sections is characterized by undulations and bowtie artifacts. Zero offset seismic models constructed using profiles of the exposed Precambrian Unconformity across the Eastern Granite-Rhyolite Province outcrops of the St. Francois Mountains feature the same seismic expression. The upper crust below the Precambrian Unconformity on the Countrymark seismic sections is also characterized by discontinuous high-amplitude reflections that occur ~0.5s two-way time below the Precambrian Unconformity. The distribution of these upper crustal reflections on a time structure map correlates with positive magnetic and gravity anomalies suggesting the reflectors are likely mafic. These geophysical observations are consistent with a scenario like that interpreted for the evolution of the Precambrian rocks of the St. Francois Mountains and also the findings of McBride et al. (2016) for patterns of reflections on seismic lines in central Illinois.
Ernest Hauser, Ph.D. (Committee Chair)
Doyle Watts, Ph.D. (Committee Member)
David Dominic, Ph.D. (Committee Member)
104 p.

Recommended Citations

Citations

  • Green, II, M. R. (2018). Geophysical Exploration of the Upper Crust Underlying North-Central Indiana: New Insight into the Eastern Granite-Rhyolite Province [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1526928196741841

    APA Style (7th edition)

  • Green, II, Michael. Geophysical Exploration of the Upper Crust Underlying North-Central Indiana: New Insight into the Eastern Granite-Rhyolite Province. 2018. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1526928196741841.

    MLA Style (8th edition)

  • Green, II, Michael. "Geophysical Exploration of the Upper Crust Underlying North-Central Indiana: New Insight into the Eastern Granite-Rhyolite Province." Master's thesis, Wright State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1526928196741841

    Chicago Manual of Style (17th edition)