Geologisk og geofysisk tolkning av en større tyngdeanomali ved RIEDNJAJAV'RI, Kautokeino
A regional gravimetric survey has revealed a strong anomaly south of Kauto- keino. Later detailed measurements shows that the anomaly consists of N-S and E-W trending limbs. The anomaly coincides with a vulcano-sedimentary sequence, largely greenstone. The residual gravimetric anomaly has a maximum of 25 mgal. The greenstone consist of metadiabase, metabasalt, tuffite and highly conductive graphite schists. A quartz monzonite instrusion is situated on the border between the greenstones and the surrounding quartz-feldspathic gneisses. The gneisses are assumed to be the basement of the greenstones. The density contrast between the greenstones and the gneiss is 0,31 1o3 kg/m3. A interpretation of the gravity anomaly shows that the greenstone belt may have a maximum depth of 5,8 km. This thickening of the greenstones is thought to coincide in time with doming of the basement. The investigation was carried out by a team consisting of geophysicists, bedrock- and quaternary geologists in an area of exceedingly poor exposure.
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