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The Resource Paleomagnetism of the Early Proterozoic Sioux quartzite, southwestern Minnesota--implications for correlating quartzites of the Baraboo interval, by Val W. Chandler and G.B. Morey

Paleomagnetism of the Early Proterozoic Sioux quartzite, southwestern Minnesota--implications for correlating quartzites of the Baraboo interval, by Val W. Chandler and G.B. Morey

Label
Paleomagnetism of the Early Proterozoic Sioux quartzite, southwestern Minnesota--implications for correlating quartzites of the Baraboo interval
Title
Paleomagnetism of the Early Proterozoic Sioux quartzite, southwestern Minnesota--implications for correlating quartzites of the Baraboo interval
Statement of responsibility
by Val W. Chandler and G.B. Morey
Creator
Contributor
Subject
Genre
Language
eng
Summary
Paleomagnetic studies were conducted on the Early Proterozoic Sioux Quartzite, one of the so-called "Baraboo interval" red-bed sequences of the Lake Superior region. A total of 158 samples were collected from 17 sites scattered across four basins (Cottonwood County, New Ulm, northern Pipestone, and southern Pipestone) in southwestern Minnesota. Alternating-field and thermal demagnetization studies indicate that the magnetization is dominantly single component, and that the magnetic carrier is hematite. Hematite occurs both as a diagenetic mineral whose long paragenetic history began shortly after deposition and as veinlets that formed during a strain event possibly related to regional tilting. The magnetization is tentatively interpreted to have occurred before regional tilting, although a definitive fold test is difficult because dips are low. Measured paleomagnetic directions at both site and basin levels show good clustering, and the average directions obtained from each of the four basins are not significantly different at the 95 percent confidence level. The good clustering at all levels of sampling indicates that the Sioux Quartzite was magnetized either within a short time interval or during a period of subdued apparent polar wander. The structurally corrected paleomagnetic directions from the four basins yield a combined paleopole location at 1 01 ° W. and 16° N. (k=65, alpha 95=11 °). Dated paleopoles for Early Proterozoic rocks in North America and age dates of rocks interpreted to underlie the Sioux Quartzite imply that its age is 1,700-1,650 Ma. This interval corresponds in part with the age of 1,800-1,630 Ma of the Central Plains orogen, which lies some 200-300 kilometers south of the Sioux Quartzite out- crop. Quartzite may reflect a tectonic pulse related to the Central Plains orogen. Preliminary paleomagnetic data on Baraboo-interval quartzites from Wisconsin indicate that the Sioux paleopole cannot be distinguished at the 95 percent confidence level from that of the Barren Quartzite, but that it differs from that of the Baraboo Quartzite, which on the basis of existing apparent polar wander data could be as much as 100 million years older. The paleomagnetic data support previously raised cautions that some Baraboo interval quartz arenites may have been deposited in separate basins at significantly different times
Member of
Additional physical form
Also available via Internet from USGS web site. Address as of 11/15/06: http://pubs.er.usgs.gov/usgspubs/b/b1904N; current access available via PURL.
Cataloging source
DLC
http://library.link/vocab/creatorName
Chandler, Val W
Dewey number
  • 557.3 s
  • 552/.4
Government publication
federal national government publication
Illustrations
  • illustrations
  • maps
Index
no index present
Literary form
non fiction
NAL call number
407
NAL item number
G29B no.1904-N
Nature of contents
bibliography
http://library.link/vocab/relatedWorkOrContributorName
Morey, G. B
Series statement
  • U.S. Geological Survey bulletin
  • Contributions to Precambrian geology of Lake Superior region
Series volume
  • 1904-N
  • ch. N
http://library.link/vocab/subjectName
  • Quartzite
  • Paleomagnetism
  • Geology, Stratigraphic
  • Geology
Label
Paleomagnetism of the Early Proterozoic Sioux quartzite, southwestern Minnesota--implications for correlating quartzites of the Baraboo interval, by Val W. Chandler and G.B. Morey
Instantiates
Publication
Note
Shipping list no.: 1992-0670-P
Bibliography note
Includes bibliographical references (pages 13-14)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
26055183
Dimensions
28 cm
Extent
iii, 14 pages
Lccn
92019534
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations, maps
Specific material designation
remote
System control number
(GPO)99199284
Label
Paleomagnetism of the Early Proterozoic Sioux quartzite, southwestern Minnesota--implications for correlating quartzites of the Baraboo interval, by Val W. Chandler and G.B. Morey
Publication
Note
Shipping list no.: 1992-0670-P
Bibliography note
Includes bibliographical references (pages 13-14)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
26055183
Dimensions
28 cm
Extent
iii, 14 pages
Lccn
92019534
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations, maps
Specific material designation
remote
System control number
(GPO)99199284

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