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dc.contributor.authorLundin, Erik
dc.contributor.authorOlesen, Odleiv
dc.contributor.authorKihle, Ola
dc.contributor.authorSkilbrei, Jan Reidar
dc.coverage.spatial19143 Ski
dc.coverage.spatial19134 Vannsjø
dc.coverage.spatial19133 Fredrikstad
dc.coverage.spatial18152 Oppkuven
dc.coverage.spatial18131 Horten
dc.coverage.spatial18132 Tjøme
dc.coverage.spatial18141 Asker
dc.coverage.spatial18151 Gran
dc.coverage.spatial18142 Drøbak
dc.coverage.spatial19154 Hurdal
dc.coverage.spatial19153 Nannestad
dc.coverage.spatial19144 Oslo
dc.description.abstractForkortet:\rThe permian Oslo Field contains a large number of interestin magnetic anomalies associated with magmatic rock bodies (lavas, dikes, calderas, and plutons). The area is characterized by large-scale circular to elliptical anomalies related to calderas and plutons, and by linear magnetic anomalies of various trends. The linear anomalies can be subdivided into three genetically different groups, which relate to: 1) Precambrian basement foliation and Paleozoic bedding, 2) Permian dikes that in turn often follow faults, 3) Deep weathering of pre-existing weaknesses (joints, faults, and possibility dikes). The first group is not of particular interest to this study and is readily excluded by comparing the anomalies with the geologic map. Anomalies related to dikes and deep weathering tend to crosscut the geology and are hence also easy to distinguis. Separating dikes from deeply weathered joints and faults can be more difficult. By in large, deeply weathered joints tend to have a negative anomaly and correlate with linear topographic depressions. Generally, dikes tend to have to have a positive anomaly, although dikes with negative anomalies do exist. Field checks of the anomalies can generally test if a trend in an area relates to dikes or weaathering. A criteria that also helps separating weathering from dikes is the width of the anomalies - those associated with deep weathering tend to be wider than the dike anomalies.
dc.relation.ispartofseriesNGU-Rapport (2005.044)
dc.rightsNavngivelse 4.0 Internasjonal
dc.titleInterpretation of the magnetic anomaly pattern in the Oslo Region.
dc.source.pagenumber43 s.
dc.relation.project(301809) GEOS - TIGRIS Tolkning og integrasjon av geofysikk rett i samfunnet

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal