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Books > Earth & environment > Earth sciences > Geology & the lithosphere > Petrology
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Petrology of Polygenic Mafic-Ultramafic Massifs of the East Sakhalin Ophiolite Association (Paperback)
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Petrology of Polygenic Mafic-Ultramafic Massifs of the East Sakhalin Ophiolite Association (Paperback)
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The monograph is concerned with results of studies of petrology of
mafic-ultramafic massifs as part of the East Sakhalin ophiolite
association. It generalizes and interprets a large body of data
(mainly original data) on geology, petrography, petrochemistry, and
geochemistry of rocks; mineralogy and geochemistry of rock-forming
and accessory minerals; chromite and platinum contents, and
isotopic age of zircons from rocks of the typical mafic-ultramafic
massifs of the East Sakhalin ophiolite association: Berezovka,
Shel'ting, Komsomol'sk, and South Schmidt. Gabbroids from the
Berezovka massif contain ultramafic xenoliths. Ultramafic rocks are
locally cut by gabbroid and pyroxenite veins. Three spatially close
but genetically autonomous bodies are distinguished in the
structure of the massifs under study: protrusion of upper-mantle
restitic ultramafic rocks (harzburgites, lherzolites, and dunites);
intrusion of orthomagmatic gabbroids (gabbronorites, gabbro, and
norites) that cuts it; and contact-reaction zone, located along the
boundaries between gabbroid intrusion and ultramafic protrusion,
which consists of hybrid ultramafic rocks (wehrlites, websterites,
clinopyroxenites, and their olivine- and plagioclase-containing
varieties) and hybrid gabbroids (melano- and mesocratic olivine
gabbronorites and gabbro as well as troctolites). The hybrid
ultramafic rocks and gabbroids are the product of interaction
between mafic melts and restitic ultramafic rocks. Taking into
account the later formation of the gabbroid intrusions compared to
the ultramafic protrusions, the massifs in question are determined
as polygenic. The idea of their polygenic formation is supported by
data on the isotopic age of zircons from the Berezovka massif
rocks. In this monograph the author develops his earlier proposed
concept of polygenic formation of mafic-ultramafic massifs
belonging to ophiolite associations. The book addresses a wide
circle of petrologists and practicing geologists as well as
senior-year students and postgraduates studying problems of
mafic-ultramafic magmatism.
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