fig11.htm

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Figure 11. Examples of the orthogonal projections in the process of thermal demagnetization of the natural remanent magnetization (Zijderveld diagrams). Filled signs - horizontal plane, open signs - vertical plane. A Monchegorsk intrusion: sample 9, the primary reverse polarity KRM is detected in the 480-515oC range, the secondary normal polarity KRM - between 540oC and 555oC, the primary reverse polarity KRM - between 555oC and 580oC; sample 34, the secondary normal polarity NRM is detected below 540oC, the primary reverse polarity component - between 540oC and 550oC and the primary normal polarity component - between 550oC and 570oC; sample 35, the secondary reverse polarity component is distinguished below 515oC, the primary reverse polarity component is detected from 540oC to 550oC, the primary normal polarity component is detected from 555oC to 580oC; sample 37, the secondary reverse polarity component is detected from 20oC to 500oC, the primary reverse polarity KRM is fixed from 500oC to 540oC, the primary normal polarity component is fixed from 540oC to 565oC; sample 40, the secondary normal polarity component is fixed up to the magnetite Curie point, this is most likely a chemical magnetization; sample 42 - example of a complicated behavior of NRM near the fault, this is predominantly the KRM, up to 545oC this is the secondary normal polarity component, between 550oC and 560oC - primary reverse polarity component, above 560oC - primary normal polarity component; sample 47, from 20oC to 580oC the primary normal polarity NRM (TRM) component is fixed; sample 53, up to 550oC the secondary normal polarity component is detected, above up to 575oC - the primary normal polarity component is detected. B) Kivakka: sample 6 - component B prevails, above 550oC component A2 is detected; samples 15, 17 and 47 - component A1 is detected above 535-550oC, component B - between 420-520oC and 550oC, between 420oC and 520oC - a component close to the recent; sample 25 - component A2 is detected from 550oC, component B - between 450oC and 550oC, below a component close to the recent is fixed; sample 33 - up to 545oC component B prevails, above - component A1 ; sample 34 - component B; sample 41 - component A1 (A2 ) is detected from 535oC, the sum of components A1 +B with similar spectra of unblocking temperatures is fixed between 420oC and 535oC, a component, evidently, close to the recent is present up to 500oC; sample 48 - component A2 is detected above 540oC, below the sum of components A2 +B is fixed; sample 50 - the sum of components A+B with similar spectra of unblocking temperatures; samples 51, 55, 57, 59 and 66 - component A1 is detected above 520-550oC, below the component B is fixed or B+A and a component close to the recent (below 500oC); sample 70 - components A1 and A2 are detected from 520oC to 660oC (smooth transition), below is the sum of components A2 +B.


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