Description
Book SynopsisThe 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, Shelâting, Komsomolâsk, 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;
Table of Contents
1 Topical problems of petrology of mafic-ultramafic massifs
2 Structural position of mafic-ultramafic massifs of the East Sakhalin ophiolite association
3 Geologic structure of mafic-ultramafic massifs of the East Sakhalin ophiolite association
4 Petrography of mafic-ultramafic massifs of the East Sakhalin ophiolite association
5 Petrochemistry of rocks of mafic-ultramafic massifs of the East Sakhalin ophiolite association
6 Geochemistry of rocks of mafic-ultramafic massifs of the East Sakhalin ophiolite association
7 Rb–Sr isotope systems in rocks of mafic-ultramafic massifs of the East Sakhalin ophiolite association
8 Chemical composition of rock-forming and accessory minerals from rocks of mafic-ultramafic massifs of the East Sakhalin ophiolite association
9 Distribution of rare earth elements in rock-forming minerals from mafic-ultramafic massifs of the East Sakhalin ophiolite association
10 Isotope-geochronological and geochemical systematization of zircons from rocks of the Berezovka mafic-ultramafic massif
11 The chromitite occurrences in mafic-ultramafic massifs of Sakhalin Island
12 Geochemistry of platinum group elements and rhenium in rocks and chromitites of mafic-ultramafic massifs of Sakhalin Island
13 The fundamentals of the concept of polygenetic formation of mafic-ultramafic complexes in ophiolite associations
Conclusions
