Geology Reference
In-Depth Information
2
FIELD SKILLS AND OUTCROP STRUCTURES
In order to make meaningful observations of igneous rocks in the field some key
skills are useful to help characterise outcrops and gross scale structures before
focusing on detailed structures and classification of igneous rocks (Chapter 3).
It should be noted that a good igneous field geologist should also be a good field
geologist in general, and be versed in structural, sedimentary and metamorphic
rocks in the field (see also additional handbooks in this series), as in most cases
the igneous rocks under consideration will be in association with other rock
types and will have invariably undergone some form of structural deformation.
In this section we focus on some key basic fieldwork skills which can be applied
to characterise igneous rock outcrops.
2.1 Equipment
When embarking on fieldwork studies the key to the correct equipment is to
be prepared. As with any outdoor activity there is a likelihood of significant
weather variation so a variety of clothing/footwear appropriate for the terrain
and environment is required. Take note of the geological fieldwork code which
contains detailed information about field safety, sampling and general rules
in the outdoors (see the Geologists' Association http://www.geologists.org.uk/
downloads/GAfieldworkcode.pdf; also refer to
Basic Geological mapping by
Barnes & Lilse
, from this geological field guide series). Regarding the equip-
ment required to complete the fieldwork, again it is most important to be as
fully prepared as possible. Some background preparation and thought to your
fieldwork will help you to be best ready to deal with the variety of rock out-
crops, scales of observation required and variety of geology and give you the
best opportunity to flourish in the field.
Basic and detailed geological fieldwork should go hand in hand and so the kit
list for the prepared field scientist should include the following (see Figure 2.1):
•
General and detailed maps of the area of interest. This can also include,
where available, ariel photographs, satellite data and even geophysical maps
which can help with regional interpretations.
