Archive for the ‘Geological Mapping’ Category

Geological Interpretation of Air Photo and Satellite Images

Geological Interpretation of Air Photo and Satellite Images

Air photographs (along with other similar remote sensed products such as satellite and radar imagery) provide both a mapping base on which to record field observations and an integrated view of landscape on which map-scale patterns of lithology and structure can be directly observed or interpreted.  Where […]

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Choosing the right scale – Regional Exploration

Explorers for minerals work with maps. The scale of the map controls the detail of the information that can be shown. With geological, geophysical or geochemical information, State Surveys , typically, present their data at regional scales ranging from 1:250,000 down to 1:50,000 : these aim to […]

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The Camera and the Interrogator

The Camera and the Interrogator

Speak to exploration geologists and you will find two views about what a geologist should do when observing outcrop or drill core in the field.  Some seek to be unbiased objective recorders of what they see.  Others constantly theorise about what they might expect, construct many possible […]

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Vergences and Fractals

Vergences and Fractals

Field geologists have long known that the style and relationships of structures seen in a hand specimen, outcrop or drill core can mimic the style and relationships of much larger structures that formed during the same deformation but occur at the scale of a geological map or section. […]

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The Movement of Faults

The Movement of Faults

  All metal deposits that have formed later than the rocks that host them (that is, epigenetic deposits) have got there by virtue of fluid transport along faults and their location, shape, size and attitude are largely determined by the strain states that existed within the fault […]

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The invention of the Palaeozoic

The invention of the Palaeozoic

The science of geology was born in the last few decades of the 18th and the first few decades of the 19th  centuries. Its development was one of advancing ideas and knowledge, but  the new knowledge above all was driven by the progressive improvement in geological method, and in […]

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A question of attitude – Handling your strikes and dips

A question of attitude – Handling your strikes and dips

Strike and dip is a convention for  measuring the attitude of a planar structure, such as a bedding plane, fault, joint or vein, in terms of the angles which it makes with the geographic coordinates of the earth’s surface – north-south, east-west and up-down. You probably know […]

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What’s the use of a geological map?

What’s the use of a geological map?

Why make a geological map? Mapping epithermal gold veins along the coast of Sumbawa, Indonesia. It’s a hard life, but someone has to do it. A geological map is a graphical presentation of geological observations and interpretations on a horizontal plane[1]. A geological section is identical in […]

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Intelligent geological mapping

Intelligent geological mapping

Producing a geological map is a process of problem solving. One of the best ways to approach problem solving is known as the system of multiple working hypotheses. Something of a buzz phrase in all sciences nowadays, not many know that the idea was first formulated in […]

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