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Illinois Basin
The Illinois Basin is a Paleozoic depositional and structural basin in the United States, centered in and underlying most of the state of Illinois, and extending into southwestern Indiana and western Kentucky. The basin is elongate, extending approximately 400 miles northwest-southeast, and 200 miles southwest-northeast.
==Boundaries and sedimentary rocks==
The basin is bordered on the northeast by the Kankakee Arch, on the southeast by the Cincinnati Arch, on the south by the Pascola Arch, on the southwest by the Ozark Dome, on the northwest by the Mississippi River Arch, and on the north by the Wisconsin Arch. The New Madrid Seismic Zone and the Wabash Valley Seismic Zone intersect the southern portion of the basin.
At its center beneath southern Illinois, the basin contains a thickness of about 15,000 feet of Cambrian through Pennsylvanian sedimentary rocks, predominantly marine, and mostly dolomite, limestone, shale, and sandstone.〔David H. Swann, “A summary geologic history of the Illinois Basin,” in ''Geology and Petroleum Production of the Illinois Basin'', Illinois Geologic Society, 1968, p.3-21.〕
The basement rocks deep below the sedimentary rocks of the basin are Proterozoic granites and rhyolite of the Eastern Granite–Rhyolite Province which dates to around 1.55 Ga.〔Van Schmus, W.R., et al., 2007, ''New insights into the southern margin of the Archean–Proterozoic boundary in the north-central United States based on U-Pb, Sm-Nd, and Ar-Ar geochronology,'' Precambrian Research, v. 157, p. 80–105, .〕〔Ben A. Van der Pluijm, Paul A. Catacosinos, ''Basement and basins of eastern North America,'' Geological Society of America, Special Paper 308, 1996, p. 14 ISBN 978-0-8137-2308-2〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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