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Article: Magnetism of the Keweenawan age Chengwatana lava flows, northwest Wisconsin

TitleMagnetism of the Keweenawan age Chengwatana lava flows, northwest Wisconsin
Authors
Issue Date1997
Citation
Geophysical Research Letters, 1997, v. 24 n. 12, p. 1523-1526 How to Cite?
AbstractThe Chengwatana Volcanics are subaerial plateau basalts which appear to be stratigraphically above the North Shore Volcanic Group of the Lake Superior Region. Sixty five oriented cores were collected at six sites near St. Croix Falls, Wisconsin. Magnetic cleaning of the samples was primarily step-wise alternating field (A.F.) demagnetization to 100 mT. Thermal demagnetization and hysteresis property measurements indicate the dominant magnetic mineralogy is multidomain magnetite. However, a stable remanence is present which we attribute to grains with single domain behavior. The mean remanent direction is D= 287.5°, 1= 45.8°, α-95 = 8.0°, with a mean pole at 186.1°E., 30.9°N. This result is consistent with the 1.1 Ga. apparent pole for the North American craton. Two sites mapped as stratigraphically equivalent show distinct reversed directions. Both A.F. and thermal demagnetization isolate the same reversed direction which is interpreted as being primary. These particular flows record a short reversal in an otherwise normal sequence. This strengthens the evidence for more than one reversal in the Middle Keweenawan, and may be the same short reversal noted at Mamainse Point. Copyright 1997 by the American Geophysical Union.
Persistent Identifierhttp://hdl.handle.net/10722/150992
ISSN
2015 Impact Factor: 4.212
2015 SCImago Journal Rankings: 3.323
References

 

DC FieldValueLanguage
dc.contributor.authorKean, WFen_US
dc.contributor.authorWilliams, Ien_US
dc.contributor.authorChan, Len_US
dc.contributor.authorFeeney, Jen_US
dc.date.accessioned2012-06-26T06:15:35Z-
dc.date.available2012-06-26T06:15:35Z-
dc.date.issued1997en_US
dc.identifier.citationGeophysical Research Letters, 1997, v. 24 n. 12, p. 1523-1526en_US
dc.identifier.issn0094-8276en_US
dc.identifier.urihttp://hdl.handle.net/10722/150992-
dc.description.abstractThe Chengwatana Volcanics are subaerial plateau basalts which appear to be stratigraphically above the North Shore Volcanic Group of the Lake Superior Region. Sixty five oriented cores were collected at six sites near St. Croix Falls, Wisconsin. Magnetic cleaning of the samples was primarily step-wise alternating field (A.F.) demagnetization to 100 mT. Thermal demagnetization and hysteresis property measurements indicate the dominant magnetic mineralogy is multidomain magnetite. However, a stable remanence is present which we attribute to grains with single domain behavior. The mean remanent direction is D= 287.5°, 1= 45.8°, α-95 = 8.0°, with a mean pole at 186.1°E., 30.9°N. This result is consistent with the 1.1 Ga. apparent pole for the North American craton. Two sites mapped as stratigraphically equivalent show distinct reversed directions. Both A.F. and thermal demagnetization isolate the same reversed direction which is interpreted as being primary. These particular flows record a short reversal in an otherwise normal sequence. This strengthens the evidence for more than one reversal in the Middle Keweenawan, and may be the same short reversal noted at Mamainse Point. Copyright 1997 by the American Geophysical Union.en_US
dc.languageengen_US
dc.relation.ispartofGeophysical Research Lettersen_US
dc.titleMagnetism of the Keweenawan age Chengwatana lava flows, northwest Wisconsinen_US
dc.typeArticleen_US
dc.identifier.emailChan, L:chanls@hku.hken_US
dc.identifier.authorityChan, L=rp00665en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0031158699en_US
dc.identifier.hkuros24503-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0031158699&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume24en_US
dc.identifier.issue12en_US
dc.identifier.spage1523en_US
dc.identifier.epage1526en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridKean, WF=7006900438en_US
dc.identifier.scopusauthoridWilliams, I=8367866300en_US
dc.identifier.scopusauthoridChan, L=7403540528en_US
dc.identifier.scopusauthoridFeeney, J=7102918848en_US

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