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Deep crustal structure of the Precambrian basement beneath northern Lake Michigan, midcontinent North America

Geology

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Abstract

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. -Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Deep crustal structure of the Precambrian basement beneath northern Lake Michigan, midcontinent North America
Series title:
Geology
Volume
19
Issue:
3
Year Published:
1991
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
207
Last page:
210