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Published
by Ministry of Northern Development & Mines in Sudbury .

Written in English

- Geology - Ontario - Makonie Lake,
- NTS 42 B/6

**Edition Notes**

11

Series | Ontario. Geological Survey. Map 81 709, Canada. Geological Survey. Open file 4066 |

The Physical Object | |
---|---|

Pagination | 1 sheet ; scale 1:50 000 |

Number of Pages | 50 |

ID Numbers | |

Open Library | OL22067590M |

KEATING COEFFICIENTS Ontario Ontario Geological Survey MAP 60 AIRBORNE MAGNETIC SURVEY Second vertical derivative of the magnetic field and Keating coefficients ATTAWAPISKAT AREA Purchased Data Scale (O Queen's Printer for Ontario, This map is published with the permission of the Senior Manager, Precambrian Geoscience Section. using a known pattern recognition technique (Keating ), which consists of computing, over a moving window, a first- order regression between a vertical cylinder model anomaly and the gridded magnetic data. Only the results where the absolute value of the correlation coefficient is above a threshold of 75% were retained. The results are depicted as circular symbols, scaled to reflect the correlation . First Vertical Derivative of the Residual Total Magnetic Field TGI II Project. using a known pattern recognition technique (Keating ), which consists of computing, over a moving window, a first- order regression between a vertical cylinder model anomaly and the gridded magnetic data. Only the results where the absolute value of the correlation coefficient is above a threshold of 75% were retained. The results are depicted as circular symbols, scaled to reflect the correlation File Size: 8MB.

Because (to a reasonable approximation) gravity points downwards everywhere on the earth's surface, to measure the force you just measure how much the potential changes in a vertical direction: that's its "first vertical derivative." The earth has a magnetic field (which rotates with it). The magnetic field is more complex than gravity, because of its tensor nature. Each of its three basic components has its . anomalies. The values for the second vertical derivative of the magnetic field were computed directly from the gridded The shaded relief parameters are: Illumination inclination: 45° Illumination declination: N 0° azimuth Keating Correlation Coefficients Possible kimberlite targets have been identified from the residual magnetic intensity data, based on the identification of roughly circular anomalies. This . This target was a Keating anomaly indicated on the Map: Dumont R., Coyle M., Potvin J. Geological Survey of Canada First Vertical Derivative of Magnetic Field With Keating Coefficients Map Ontario: Bolkow, NTS 42 B/4 Open File I. OGS Map 81 Scale The target sits part way down the side of a hill along the side of a Size: 8MB. magnetic intensity data, based on the identification of roughly circular anomalies. This procedure was automated by using a known pattern-recognition technique (Keating ), which consists of computing, over a moving window, a first-order regression between a vertical cylinder model anomaly and the gridded magnetic data.

The analytic signal is calculated by taking the square root of the sum of the squares of each of the three directional first derivatives of the magnetic field as follows: |A(x,y)|= ((d T/ d x) 2 + (d T/ d y) 2 + (d T/ d z. The derivatives of the total magnetic field can be determined using numerical procedures of Baranov (), Nabighian () or with gradiometers (Slack et al., , Eggers and Thompson, , Herwanger et al., ). Baranov () presented coefficients for the numerical determination of vertical derivative of the potential fields. These Cited by: 9. Total Field Magnetometer surveys were conducted over Keating magnetic anomalies identified from Geological Survey of Canada First Vertical Derivative of Magnetic Field with Keating Coefficients Map Ontario: Bolkow Open File / OGS Map 81 and Manitowik Lake Open File OGS Map 81 Estimating the location of magnetic sources using magnetic gradient tensor data Article in Exploration Geophysics 50(6) May with 54 Reads How we measure 'reads'.

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