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The Commerce Geophysical Lineament and Its Possible Relation to Mesoproterozoic Igneous Complexes and Large Earthquakes in the Central Illinois Basin

2002; Seismological Society of America; Volume: 73; Issue: 5 Linguagem: Inglês

10.1785/gssrl.73.5.640

1938-2057

T. G. Hildenbrand, John H. McBride, D. Ravat,

Geological and Geochemical Analysis

Research Article| September 01, 2002 The Commerce Geophysical Lineament and Its Possible Relation to Mesoproterozoic Igneous Complexes and Large Earthquakes in the Central Illinois Basin Thomas G. Hildenbrand; Thomas G. Hildenbrand U.S. Geological Survey 345 Middlefield Road MS 989 Menlo Park CA 94025 tom@usgs.gov(T.G.H.) Search for other works by this author on: GSW Google Scholar John H. McBride; John H. McBride Illinois State Geological Survey and Department of Geology University of Illinois at Urbana-Champaign 615 East Peabody Drive Champaign, IL 61820 (J.H.M.) Search for other works by this author on: GSW Google Scholar D. Ravat D. Ravat Department of Geology 4324 Southern Illinois University Carbondale, IL 62901-4324 (D.R.) Search for other works by this author on: GSW Google Scholar Seismological Research Letters (2002) 73 (5): 640–659. https://doi.org/10.1785/gssrl.73.5.640 Article history first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Thomas G. Hildenbrand, John H. McBride, D. Ravat; The Commerce Geophysical Lineament and Its Possible Relation to Mesoproterozoic Igneous Complexes and Large Earthquakes in the Central Illinois Basin. Seismological Research Letters 2002;; 73 (5): 640–659. doi: https://doi.org/10.1785/gssrl.73.5.640 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietySeismological Research Letters Search Advanced Search Abstract New inversions of existing magnetic and gravity data lead to insights on upper crustal structures in the central Illinois basin. The results of 2D and 3D inversion techniques suggest that the source of the Commerce geophysical lineament follows the southeast boundary of a dense and magnetic, northeast-trending igneous center, named the Vincennes igneous center. Thus the Commerce geophysical lineament, defining the 5- to 10-km-wide Commerce deformation zone, appears to have influenced the structural development of the Vincennes igneous center. Overlying this igneous center is the Centralia seismic-reflection sequence, expressed as highly coherent reflectors (McBride and Kolata, 1999). We suggest that the buried Vincennes igneous center is the source of inferred volcanic units of the Centralia sequence and is related to a rifted margin or a Proterozoic plate boundary. A comparison of gravity and magnetic fields over the Vincennes igneous center and the St. Francois Mountains igneous center in southeastern Missouri suggests that the associated sources in these regions are similar in composition and perhaps origin. Such a conclusion, although speculative, suggests that ∼1.47 Ga-year-old volcanic fields of high-silica rocks, with more abundant mafic components at depth, characterize basement in the regions of the Vincennes igneous center and the St. Francois Mountains. Further, we conclude that the Commerce deformation zone evolved in the Mesoproterozoic (1.1 to 1.5 Ga) as a major cratonic rheological boundary and was the focus of episodic reactivation related to varying stress regimes throughout its history.Spatial relations of the Commerce deformation zone with large Pleistocene and Holocene earthquakes suggest that the zone represents a major rheological boundary intimately related to both surface and deep structures and to the seismic hazard of the Illinois basin region. Assuming recent right-lateral slip along the Commerce deformation zone, we propose that a jog or left step in the Vincennes area leads to thrusting or a restraining bend, where associated stress accumulations may have resulted in nearby large prehistoric earthquakes and may also be the nucleation sites of future large earthquakes. You do not currently have access to this article.