U.S. Geological Survey Bulletin

U.S. Geological Survey Bulletin
Author: Gene L. LaBerge
Publisher:
Total Pages: 346
Release: 1991
Genre: Faults (Geology)
ISBN:

A reconnaissance study carried out in conjunction with regional geologic mapping.

Archean to Anthropocene

Archean to Anthropocene
Author: James D. Miller
Publisher: Geological Society of America
Total Pages: 593
Release: 2011-01-01
Genre: Science
ISBN: 0813700248

Precambrian Crustal Blocks in Minnesota

Precambrian Crustal Blocks in Minnesota
Author: S. R. Hemming
Publisher:
Total Pages: 24
Release: 1995
Genre: Geology
ISBN:

Sm-Nd survey of Precambrian granitic and metasedimentary rocks collected from several geophysically defined blocks in central Minnesota confirms the presence of some fundamental geologic boundaries previously mapped on the basis of structure. The Malmo discontinuity an Early Proterozoic structure separates the Archean Minnesota River Valley ter- ranes from an Early Proterozoic (Penokean magmatic) terrane and the McGrath Gneiss dome of east-central Minnesota North of this boundary, the Penokean fold-and-thrust belt can be divided into fault-bounded terranes that were assembled during the Penokean orogeny. Each terrane within the study area has distinct crust formation ages.