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IGNEOUS ROCKS: A CLASSIFICATION AND
GLOSSARY OF TERMS
Decades of field and microscope studies and more recent quantitative geo-
chemical analyses have resulted in a vast, and sometimes overwhelming, array
of nomenclature and terminology associated with igneous rocks. Under the
auspices of the International Union of Geological Sciences (IUGS), a group
of petrologists from around the world has laboured for more than 30 years to
collate these terms, gain international agreement on their usage, and reassess
the methods by which we categorize and name igneous rocks.
This book presents the results of their work and gives plete classifi-
cation of igneous rocks based on all the mendations of the IUGS Sub-
commission on the Systematics of Igneous Rocks. Revised from the 1st edition
(1989), it shows how igneous rocks can be distinguished in the sequence of
pyroclastic rocks, carbonatites, melilite-bearing rocks, kalsilite-bearing rocks,
kimberlites, lamproites, leucite-bearing rocks, lamprophyres and charnockites.
It also demonstrates how the mon plutonic and volcanic rocks that
remain can then be categorized using the familiar and widely accepted modal
QAPF and chemical TAS classification systems. The glossary of igneous terms
has been fully updated since the 1st edition and now includes 1637 entries, of
which 316 are mended by the mission, 312 are regarded as local
terms, and 413 are now considered obsolete.
Incorporating prehensive list of source references for all the terms
included in the glossary, this book will be an indispensable reference guide
for all geologists studying igneous rocks, either in the field or the laboratory.
It presents a standardized and widely accepted naming scheme that will allow
geologists to interpret terminology found in the primary literature and provide
formal names for rock samples based on petrographic analyses.
Work on this book started as long ago as 1958 when Albert Streckei