BGS classification of lithodemic units : a classification of onshore Phanerozoic intrusions in the UK
2012
This report presents a classification of mapped onshore
igneous intrusions of the UK that were emplaced during
the Phanerozoic Eon, and which are represented in the BGS DiGMapGB-50 model and its equivalent in Northern
Ireland. It represents the first significant step towards a
comprehensive, unified classification of lithodemic units
in the UK, to complement well-advanced efforts to produce
a full classification of lithostratigraphical units (set out
in the BGS Stratigraphical Framework report series).
The structure of the classification and the procedure for
assigning formal names to intrusive units follow the proposals of Gillespie et al. (2008). In that scheme, 34
different types of individual intrusions and groupings
of intrusions are arranged in a hierarchical parent–child
association spanning six formal ranks (Figure 1); Rank 1
is taken to be the ‘highest’ and Rank 6 the ‘lowest’. A
further eight types of lithodemic unit are used to classify
mapped units that consist mainly of intrusive rock but have
a ‘mixed’ character, encompassing a significant proportion
of non-intrusive rocks (Figure 1).
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