Tertiary volcanism in the veneto: Magmatology, petrogenesis and geodynamic implications
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Keywords:
Petrogenesis
Ultramafic rock
Lile
Petrogenesis
Felsic
Pleochroism
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Petrogenesis
Geochronology
Lithophile
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The introductions to each of the preceding
chapters (Sections I) have reviewed the conclusions reached, and provided
some cross references to other chapters.
This final contribution reviews in general
and historical terms some of the problems of the petrogenesis of ultramafic and ultrabasic
rocks. The greater part of the review
deals with the petrogenesis of the alpine-type
ultramafic rocks, because these have
served as a focus of controversy for many
years. The variety of ultramafic rock associations
in different tectonic environments,
and of the processes involved in
their formation, have been emphasized
throughout the book. Both are important
in considering petrogenesis. Although interpretation
of processes may require extensive
study, rock associations are more
easily distinguished; but the distinctions
have not always been made. Hess (1955,
p. 394) drew attention to this with the following
statement: Gross errors have probably
resulted from applying conclusions
drawn from facts related to mica peridotites
to alpine peridotites and vice versa.
If mica peridotite had been called humpty-dumptyite,
these probably would not have
arisen.
Ultramafic rock
Petrogenesis
Peridotite
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Petrogenesis
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Petrogenesis
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<div>Geochronology appendix</div>
Petrogenesis
Geochronology
Basement
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<div>Geochronology appendix</div>
Petrogenesis
Geochronology
Basement
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