Deep crustal structure of the Precambrian basement beneath northern Lake Michigan, midcontinent North America
Journal Article
·
· Geology; (USA)
- U.S. Geological Survey, Reston, Virginia (USA)
- U.S. Geological Survey, Denver, Colorado (USA)
- Purdue Univ., West Layfayette, Indiana (USA)
- Geological Survey of Canada, Ottawa, Ontario (Canada)
A deep seismic-reflection profile in northern Lake Michigan, midcontinent North America, provides a cross section of the crust across the 1850 Ma Penokean orogen, in which an Early Proterozoic island-arc complex was deformed between two converging Archean continental masses. The island-arc crust is about 40 km thick and has a few kilometres of intensely reflective rocks near its base, above which it is variably reflective to transparent. The Archean terranes have thicker crust, as much as 50 km, the lower 20-25 km of which is strongly reflective. Abrupt offsets of Moho near terrane boundaries may have been preserved since accretion during the Penokean orogeny.
- OSTI ID:
- 5731976
- Journal Information:
- Geology; (USA), Journal Name: Geology; (USA) Vol. 19:3; ISSN GLGYB; ISSN 0091-7613
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Imaging the midcontinent rift beneath Lake Superior using large aperture seismic data
Conference
·
Tue Dec 31 23:00:00 EST 1991
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5936368
Identification of 2. 0 to 2. 4 Ga Nd model age crustal material in the Cheyenne belt, southeastern Wyoming: Implications for Proterozoic accretionary tectonics at the southern margin of the Wyoming craton
Journal Article
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Sun Mar 31 23:00:00 EST 1991
· Geology; (USA)
·
OSTI ID:5611174
Imaging the midcontinent rift beneath Lake Superior using large aperture seismic data
Journal Article
·
Sun Mar 31 23:00:00 EST 1991
· Geophysical Research Letters (American Geophysical Union); (United States)
·
OSTI ID:5598153
Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
BASEMENT ROCK
CONTINENTAL CRUST
DEFORMATION
DIMENSIONS
EARTH CRUST
GEOLOGIC AGES
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
GREAT LAKES
LAKE MICHIGAN
LAKES
OPTICAL PROPERTIES
OROGENESIS
PHYSICAL PROPERTIES
PRECAMBRIAN ERA
REFLECTIVITY
SEISMIC SURVEYS
SURFACE PROPERTIES
SURFACE WATERS
SURVEYS
TECTONICS
THICKNESS
580000* -- Geosciences
BASEMENT ROCK
CONTINENTAL CRUST
DEFORMATION
DIMENSIONS
EARTH CRUST
GEOLOGIC AGES
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
GREAT LAKES
LAKE MICHIGAN
LAKES
OPTICAL PROPERTIES
OROGENESIS
PHYSICAL PROPERTIES
PRECAMBRIAN ERA
REFLECTIVITY
SEISMIC SURVEYS
SURFACE PROPERTIES
SURFACE WATERS
SURVEYS
TECTONICS
THICKNESS