Download or read book Pre Mt Simon Seismic Sequences Below West Central Indiana written by Andrew Michael Parent and published by . This book was released on 2017 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constraining the composition, structure, and origin of basement provinces, deep assemblages of Precambrian rocks, is largely dependent on deep boreholes and geophysical techniques. This is especially true for the eastern U.S. midcontinent. Here, I employ regional 2-D seismic reflection, Bouguer gravity, and aeromagnetic data to interpret the upper crust below west-central Indiana. Seismic reflection data were donated to Wright State University in 2015. Geopotential data are available through the USGS and affiliates. These geophysical data, together, are analyzed in a regional geologic context.Three distinct seismic stratigraphic sequences are observed on 2-D sections. The first, uppermost sequence, typified by continuous, high-amplitude, stratified reflections is constrained by boreholes and previous seismic investigations as the Paleozoic sedimentary sequence that masks the midcontinent basement. The Cambrian Mt. Simon Sandstone constitutes the base of this unit, which is underlain by the second, poorly reflective, westward-thinning sequence. Weak internal reflections create an apparent angular unconformity with the base of the Mt. Simon and appear concordant with reflections of the basal seismic package. This unit, termed the Wilbur sequence, compares well with the seismic character of the Middle Run Formation of western Ohio and Kentucky. A third, well-reflective sequence is observed at the base of the record. Stratal geometries, such as onlap and stratigraphic terminations, are locally observable on regional east-west profiles. A positive Bouguer anomaly appears associated with the apparent structural closure of this sequence, herein termed the Quincy, below northeast Owen County. Geophysical signatures of the Quincy suggest a depositional origin, composed of low-magnetic igneous rocks (rhyolites) sourced from midcontinent volcanic centers and clastic sediments from collapsed calderas.These data facilitate two alternative hypotheses. The pattern seen in west-central Indiana (Wilbur over Quincy) may correlate with that seen below southwest Ohio (Middle Run over reflective basement). This would suggest that the Middle Run was deposited over a larger regional area than early syn-rift models suggested, fortifying recent interpretations that the Middle Run represents the foreland basin sedimentary package generated by the Grenville Orogeny. It is possible, conversely, that both Wilbur and Quincy sequences are sedimentary and/or volcanic units associated with the Eastern Granite-Rhyolite Province and pre-date the Middle Run entirely. Both models suggest contrasting yet significant tectonic settings of the pre-Mt. Simon U.S. midcontinent.
Download or read book Interpretation of a Seismic Reflection Survey and Geophysical Well Logs in Jay County Indiana written by Md. Saiful Alam and published by . This book was released on 2018 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: In August 2017, a dynamite-sourced 2D seismic reflection survey was conducted along a gravel road northwest of Portland, Indiana. The main focus of the survey was to determine the orientation of a lithologic unit previously identified by Welder (2014) on a similar 2D seismic reflection survey in the same area. Drillers logs of two wells within this area identified a limestone layer below the Mt. Simon Sandstone, and a similar limestone layer was identified in a well drilled in Clark County, Ohio. As the focus of this study, this limestone layer will be informally named the 'V̀otaw limestone'. The seismic line studied by Welder (2014) was oriented west-east; the seismic line utilized in this study is oriented north-south and crosses the previous one. Together, these seismic lines allow the true orientation of the Votaw limestone to be determined. Geophysical logs from nearby wells and two distant ones (north central Indiana and western Ohio) were used to produce synthetic seismograms which together with drillers logs were used identify the top of Eden, Trenton, Knox, Eau Claire, Mt. Simon, and Middle Run formations. The top of the Votaw limestone was associated with a reflection in the seismic data using the synthetics and the driller's logs for the nearby wells. Importantly, where the Middle Run Formation exists, the Votaw limestone occurs below the top of the Middle Run. The Votaw limestone is horizontal in both north-south and west-east seismic lines, confirming that it is truly horizontal in this area. This limestone could be present beneath the Middle Run in Warren County, Ohio, based on similar seismic characteristics of reflectors. The pre-stack CDP's were used to analyze the Amplitude Variation with Offset (AVO) response of the limestone layer. The limestone reflector primarily exhibited a negative gradient with some variations suggesting an impurity of the limestone.The limestone reflector in the area is parallel to the overlying Paleozoic reflectors suggesting the lack of any Grenville deformation. For all these reasons, the site could be a prime candidate for drilling and coring of the entire lithologic sequence beneath the Mt. Simon Sandstone.
Download or read book Information Circular written by Ohio. Division of Geological Survey and published by . This book was released on 1938 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Report Geological Survey written by and published by . This book was released on 1992 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Publication written by and published by . This book was released on 1992 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The East Continent Rift Basin written by David C. Harris and published by . This book was released on 1992 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Petroleum Abstracts written by and published by . This book was released on 1997 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology of Illinois written by Dennis R. Kolata and published by University of Illinois Press. This book was released on 2010 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geology of Illinois has been compiled from more than a century of earth science investigations in Illinois. For the first time, this information has been summarized and made accessible in one volume to help both geologists and non-geologists better understand how the state's mostly unseen geology affects, and is affected by, life on the surface. More than 200 color photographs, maps, and drawings illustrate the text. Topics include : the history of geological investigations in Illinois; the impact of the state's tectonic and structural history; the properties and classification of its rocks and sediments; the rich heritage of its land, water, and mineral resources; the threats from its geological hazards; and the application of geological information to societal issues.
Download or read book Middle Proterozoic to Cambrian Rifting Central North America written by Richard W. Ojakangas and published by . This book was released on 1997 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the Tenth International Basement Tectonics Conference held at the University of Minnesota-Duluth in August 1992, this volume contains 19 papers, 13 of which focus on the Middle Proterozoic Midcontinent Rift. An introductory essay discussing the Middle Proterozoic to Cambrian rifting in central North America is followed by contributions addressing topics including the Midcontinent Rift in Michigan and Minnesota, the Port Coldwell veins of northern Ontario, and petrography and sedimentation in the western Lake Superior region. The last five papers deal with the pre-Mount Simon basins of Ohio, the English Graben and the newly proposed East Continent Rift Complex, the Reelfoot Rift/Rough Creek Graben in the evolution of the Illinois Basin, and the A-type sheet granites in the Oklahoma Aulacogen of Cambrian age. Bandw illustrations. Annotation copyrighted by Book News, Inc., Portland, OR
Download or read book Interior Cratonic Basins written by Morris Wellman Leighton and published by . This book was released on 1991 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed overview of the Illinois basin is followed by less detailed reviews of six other selected interior cratonic basins: the Williston, Michigan, Baltic, Paris, Parana, and Carpentaria basins. The goal is to develop a better understanding of the basin-forming, basin-filling, and basin-modifying processes that control hydrocarbon plays and resultant oil and gas fields in this class of basins. The idea is to describe and document the variations, opportunities, and exploration problems that can be expected.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1998 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Compass written by and published by . This book was released on 1989 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy Structure and Production History of the Trenton Limestone Ordovician and Adjacent Strata in Northwestern Ohio written by Lawrence H. Wickstrom and published by . This book was released on 1992 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Interstate Oil Gas Compact Committee Bulletin written by Interstate Oil Compact Commission and published by . This book was released on 1987 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of Investigations written by Lawrence H. Wickstrom and published by . This book was released on 1992 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of Investigations written by Ohio. Division of Geological Survey and published by . This book was released on 1947 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
