2 options
Precambrian crustal blocks in Minnesota : neodymium isotope evidence from basement and metasedimentary rocks / by S.R. Hemming, G.N. Hanson, and S.M. McLennan.
- Format:
- Book
- Government document
- Author/Creator:
- Hemming, S. R., author.
- Hanson, Gilbert N., author.
- McLennan, Scott M., author.
- Series:
- Contributions to Precambrian geology of Lake Superior region ; ch. U.
- U.S. Geological Survey bulletin ; 1904-U.
- Contributions to Precambrian geology of Lake Superior region ; ch. U
- U.S. Geological Survey bulletin ; 1904-U
- Language:
- English
- Subjects (All):
- Geology, Stratigraphic--Precambrian.
- Geology, Stratigraphic.
- Samarium-neodymium dating--Minnesota.
- Samarium-neodymium dating.
- Geology--Minnesota.
- Geology.
- Precambrian Geologic Period.
- Minnesota.
- Physical Description:
- 1 online resource (iii, 15 pages) : illustrations, maps.
- Distribution:
- [Washington, D.C.] : United States Government Printing Office
- Other Title:
- Neodymium isotope evidence from basement and metasedimentary rocks
- Place of Publication:
- [Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, 1995.
- Summary:
- 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.
- Notes:
- Includes bibliographical references (pages 13-15).
- Description based on print version record.
- Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2011.
- Other Format:
- Print version: Hemming, S. R. Precambrian crustal blocks in Minnesota
- OCLC:
- 937435766
- Access Restriction:
- Use copy Restrictions unspecified
The Penn Libraries is committed to describing library materials using current, accurate, and responsible language. If you discover outdated or inaccurate language, please fill out this feedback form to report it and suggest alternative language.