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dc.contributor.authorSmithson, Scott B.
dc.coverage.spatial15123 Evje
dc.coverage.spatial15122 Mykland
dc.coverage.spatial16114 Arendal
dc.coverage.spatial15111 Lillesand
dc.coverage.spatialAGDER
dc.coverage.spatialTELEMARK
dc.date.accessioned2020-08-26T12:52:34Z
dc.date.available2020-08-26T12:52:34Z
dc.date.issued1963
dc.identifier.urihttps://hdl.handle.net/11250/2674747
dc.description.abstractThe Bouguer gravity anomaly map, based on 778 stations, covers the Precambrian rocks along the southeast coast of Norway from the Oslo region to Kristiansand. The principal features of the map are the low gravity gradient over the Telemark rocks and the steep gradient over the Babmle rocks, upon which are superposed the anomalies of smaller geological bodies. The Bamble anomalies, which increase toward the coast, attain a value of +-50 mgal along the coast. Negative gravity anomalies occur over the late- to postkinematic Herefoss and Grimstad granites and the synkinematic Oddersjå granite, and a positive gravity anomaly occurs over the nickeliferous Evje amphibolite. The gravity gradients over the Telemark and Bamble rocks change at the trace of the \"great friction breccia\" that separates the Telemark and the Bamble rocks. A wedge of more dense material that thickens from the breccia to the coast is postulated as the source of the steep Bamble gravity gradient. The Wedge corresponds to the succession of the Bamble supracrustal rocks overlying the Telemark granitic gneisses. The throw at the breccia zone is calculated to be a minimum figure of 0.5 km. A residual gravity anomaly map is presented for the Herefoss and Grimstad granites and vicinity. The Grimstad granite has an anomaly of -13 mgal.
dc.language.isoeng
dc.relation.ispartofseriesNGU (214B)
dc.rightsNavngivelse 4.0 Internasjonal
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no
dc.subjectGRAVIMETRI
dc.subjectKARTLEGGING
dc.subjectGEOFYSISK METODE
dc.subjectBERGGRUNNSGEOLOGI
dc.subjectPREKAMBRIUM
dc.subjectANOMALI
dc.titleGranite studies I. A gravity investigation of two Precambrian granites in South Norway.
dc.typeJournal article
dc.description.localcode36092
dc.source.pagenumber1-88


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