Super- HRAM (Helicopter) Data
Example 3 – Fold mapping in the mountain belt
Since most sedimentary rock contain at least some horizons with
enhanced magnetic properties, areas where these rocks are deformed and eroded
they are likely to give rise to distinct magnetic anomaly patterns. This
phenomena is best observed in the folded and faulted strata of mountain
belts. The outcrop pattern of folds or fault truncations is easily
identified in magnetic images, making the geological task of outlining
structures much easier and more accurate.
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Example of the magnetic anomalies
derived from folded sedimentary units outcropping in mountainous terrane.
The image shows two anticlinal structures (red) outlined by strong
magnetic anomalies associated with volcanic ash units (white) within the
section. Separating the anticlines is a syncline that is partially
defined by magnetic anomalies associated with clastic sedimentary rocks
(grey). The example is from the southern Rocky Mountains, Canada.
[click to enlarge]
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The identification of surface magnetic contact anomalies (analogous to
bedrock mapping) is especially important in areas where targets at depth
are in structural continuity with the surface structures. This is
generally true for much of the northern Canadian Rockies deformed belt.
By defining magnetic contacts, and integrating this information with
surface geology and topography, it is possible to create an array of
valuable geological products. Structure contour maps, bedding strikes and
dips, fold axes, hinge-line traces, and fold culminations are just some
of the geological products that have been defined. In addition, knowledge
of the geometry (fold pattern and bed dip) is crucial in anisotropic
depth migration, a seismic processing method that has become popular in
areas of folded clastic strata.
Example 1 – Thrust fault detection.
Example 2 – Shallow channel detection.
back to Super- HRAM (Helicopter) Data
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