Geophysical constraints on understanding the origin of the Illinois basin and its underlying crust

Abstract Interpretation of reprocessed seismic reflection profiles reveals three highly coherent, layered, unconformity-bounded sequences that overlie (or are incorporated within) the Proterozoic “granite–rhyolite province” beneath the Paleozoic Illinois basin and extend down into middle crustal depths. The sequences, which are situated in east–central Illinois and west–central Indiana, are bounded by strong, laterally continuous reflectors that are mappable over distances in excess of 200 km and are expressed as broad “basinal” packages that become areally more restricted with depth. Normal-fault reflector offsets progressively disrupt the sequences with depth along their outer margins. We interpret these sequences as being remnants of a Proterozoic rhyolitic caldera complex and/or rift episode related to the original thermal event that produced the granite–rhyolite province. The overall thickness and distribution of the sequences mimic closely those of the overlying Mt. Simon (Late Cambrian) clastic sediments and indicate that an episode of localized subsidence was underway before deposition of the post-Cambrian Illinois basin stratigraphic succession, which is centered farther south over the “New Madrid rift system” (i.e., Reelfoot rift and Rough Creek graben). The present configuration of the Illinois basin was therefore shaped by the cumulative effects of subsidence in two separate regions, the Proterozoic caldera complex and/or rift in east–central Illinois and west–central Indiana and the New Madrid rift system to the south. Filtered isostatic gravity and magnetic intensity data preclude a large mafic igneous component to the crust so that any Proterozoic volcanic or rift episode must not have tapped deeply or significantly into the lower crust or upper mantle during the heating event responsible for the granite–rhyolite.

[1]  John H. McBride,et al.  Investigating Possible Earthquake-Related Structure Beneath the Southern Illinois Basin from Seismic Reflection , 1997 .

[2]  J. A. Drahovzal,et al.  Proterozoic Sequences and Their Implications for Precambrian and Cambrian Geologic Evolution of Western Kentucky: Evidence from Seismic-Reflection Data , 1997 .

[3]  David A. Okaya,et al.  Extraction of deep crustal reflections from shallow Vibroseis data using extended correlation , 1989 .

[4]  Thomas L. Pratt,et al.  Widespread buried Precambrian layered sequences in the U.S. Mid-Continent; evidence for large Proterozoic depositional basins , 1992 .

[5]  J. Anderson,et al.  Nature and origin of Proterozoic A-type granitic magmatism in the southwestern United States of America , 1989 .

[6]  Thomas G. Hildenbrand,et al.  The Commerce Geophysical Lineament and Its Possible Relation to Mesoproterozoic Igneous Complexes and Large Earthquakes in the Central Illinois Basin , 2002 .

[7]  A. Hsui,et al.  Tectonic Subsidence Analysis of the Illinois Basin , 1986, The Journal of Geology.

[8]  G. R. Keller,et al.  Tectonic development of the New Madrid rift complex, Mississippi embayment, North America , 1986 .

[9]  M. Bickford,et al.  CALDERAS IN THE PRECAMBRIAN TERRANE OF THE ST. FRANCOIS MOUNTAINS , 1981 .

[10]  W. Mooney,et al.  Geophysical Framework of the Continental United States , 1990 .

[11]  R. L. Hay,et al.  Studies in Volcanology: A Memoir in Honor of Howel Williams , 1968 .

[12]  J. Rupp,et al.  Seismic Interpretation of the Deep Structure of the Wabash Valley Fault System , 1997 .

[13]  Douglas S. Miller,et al.  P and S velocity structure of the Yellowstone volcanic field from local earthquake and controlled-source tomography , 1999 .

[14]  P. C. Heigold,et al.  Proterozoic crustal boundary in the southern part of the Illinois Basin , 1993 .

[15]  R. E. Denison,et al.  Geology and Geochronology of Precambrian Rocks in the Central Interior Region of the United States , 1984 .

[16]  S. Planke,et al.  Seismic volcanostratigraphy of large-volume basaltic extrusive complexes on rifted margins , 2000 .

[17]  C. Payton,et al.  Seismic stratigraphy and global changes of sea level; Part 2, The depositional sequence as a basic unit for stratigraphic analysis , 1977 .

[18]  T. Hildenbrand,et al.  Bouguer Gravity Map of the Rio Grande Rift , 1982 .

[19]  J. Voss,et al.  3D MODELLING OF DIFFRACTIONS OBSERVED ON DEEP REFLECTION LINE DEKORP 2‐S1 , 1989 .

[20]  R. Stearns,et al.  Late Cretaceous and Subsequent Structural Development of the Northern Mississippi Embayment Area , 1962 .

[21]  M. Warner.  Water or shear zones in the lower continental crust , 1990 .

[22]  O. Merle,et al.  Experimental study of caldera formation , 2000 .

[23]  A. Hsui,et al.  Origin of cratonic basins , 1987 .

[24]  G. R. Lowell.  The Butler Hill Caldera: a mid-Proterozoic ignimbrite-granite complex , 1991 .

[25]  T. Hildenbrand,et al.  Geophysical Setting of the Wabash Valley Fault System , 1997 .

[26]  P. E. Potter,et al.  Pre-Mount Simon basin under the Cincinnati Arch , 1991 .

[27]  R. Simpson,et al.  A new isostatic residual gravity map of the conterminous United States with a discussion on the significance of isostatic residual anomalies , 1986 .

[28]  M. Kominz,et al.  Disentangling Middle Paleozoic sea level and tectonic events in cratonic margins and cratonic basins of North America , 1991 .

[29]  M. Bickford,et al.  Proterozoic history of the midcontinent region of North America , 1986 .

[30]  W. Hinze,et al.  Seismic reflection profiling studies of a buried Precambrian rift beneath the Wabash Valley fault zone , 1986 .

[31]  Edward G. Lidiak.  Geochemistry of subsurface Proterozoic rocks in the eastern Midcontinent of the United States: Further evidence for a within-plate tectonic setting , 1996 .

[32]  G. R. Keller,et al.  Geologic significance of regional gravity and magnetic anomalies in the East‐Central midcontinent , 1982 .

[33]  J. Healy,et al.  Deep Structure of Northern Mississippi Embayment , 1983 .

[34]  W. R. Schmus,et al.  The Midcontinent Rift System , 1985 .

[35]  A. Bally,et al.  The Geology of North America: An Overview , 1989 .

[36]  William J. Hinze,et al.  The Utility of Regional Gravity and Magnetic Anomaly Maps , 1985 .

[37]  Christopher G. Newhall,et al.  Historical unrest at large calderas of the world , 1989 .

[38]  F. M. Bullard.  Volcanoes of the Earth , 1977 .

[39]  Robert B. Smith,et al.  The 1978 Yellowstone‐Eastern Snake River Plain Seismic Profiling Experiment: Data and upper crustal structure of the Yellowstone Region , 1982 .

[40]  C. Payton.  Seismic Stratigraphy — Applications to Hydrocarbon Exploration , 1977 .

[41]  F. Cozzarelli,et al.  Mechanism of subsidence of ancient cratonic rift basins , 1983 .

[42]  B. Bhattacharyya,et al.  TWO‐DIMENSIONAL HARMONIC ANALYSIS AS A TOOL FOR MAGNETIC INTERPRETATION , 1965 .

[43]  W. Mooney,et al.  Crustal Structure of the Northern Mississippi Embayment and a Comparison with other Continental Rift Zones , 1983 .

[44]  L. Mcginnis,et al.  Reelfoot Rift: Reactivated Precursor to the Mississippi Embayment , 1975 .

[45]  Öz Yilmaz,et al.  Seismic data processing , 1987 .

[46]  E. B. Kisvarsányi.  Granitic ring complexes and Precambrian hot-spot activity in the St. Francois terrane, Midcontinent region, United States , 1980 .

[47]  G. Klein.  Origin and evolution of North American cratonic basins , 1991 .

[48]  J. Bubb,et al.  Seismic Stratigraphy and Global Changes of Sea Level, Part 10: Seismic Recognition of Carbonate Buildups , 1978 .

[49]  D. R. Kolata,et al.  Tectonic history of the Illinois basin , 1990 .

[50]  W. Mooney,et al.  The seismic structure of the continental crust and upper mantle of North America , 1989 .

[51]  R. Catchings.  Regional Vp, Vs, Vp/Vs, and Poisson's ratios across earthquake source zones from Memphis, Tennessee, to St. Louis, Missouri , 1999, Bulletin of the Seismological Society of America.

[52]  G. Walker,et al.  Stratigraphy, paleomagnetism, and magnetic fabric of the Toba Tuffs: Constraints on the sources and eruptive styles , 1986 .

[53]  W. Rose,et al.  Eruptive history of Earth's largest Quaternary caldera (Toba, Indonesia) clarified , 1991 .

[54]  T. L. Pratt,et al.  Major Proterozoic basement features of the eastern midcontinent of North America revealed by recent COCORP profiling , 1989 .

[55]  John H. McBride,et al.  Proterozoic Structure, Cambrian Rifting, and Younger Faulting as Revealed by a Regional Seismic Reflection Network in the Southern Illinois Basin , 1997 .

[56]  C. Berndt,et al.  Seismic volcanostratigraphy of the Norwegian Margin: constraints on tectonomagmatic break-up processes , 2001, Journal of the Geological Society.

[57]  T. Hildenbrand,et al.  Geophysical setting of the Reelfoot Rift and relations between rift structures and the New Madrid seismic zone , 1995 .

[58]  S. Kaufman,et al.  A three-dimensional study of seismic diffraction patterns from deep basement sources , 1981 .

[59]  Dennis R. Kolata,et al.  Role of the Reelfoot Rift/Rough Creek Graben in the evolution of the Illinois Basin , 1997 .

[60]  M. Webring.  MINC; a gridding program based on minimum curvature , 1981 .

[61]  John W. Geissman,et al.  Refining Rodinia: geologic evidence for the Australia-western U , 1999 .

[62]  L. Cordell.  Regional positive gravity anomaly over the Mississippi Embayment , 1977 .

[63]  E. Hauser.  Midcontinent rifting in a Grenville embrace , 1996 .

[64]  W. R. Schmus,et al.  Proterozoic geology of the east-central Midcontinent basement , 1996 .

[65]  John H. McBride,et al.  Upper crust beneath the central Illinois basin, United States , 1999 .