Petrology of Polygenic Mafic-Ultramafic Massifs of the East Sakhalin Ophiolite Association: 1st Edition (Hardback) book cover

Petrology of Polygenic Mafic-Ultramafic Massifs of the East Sakhalin Ophiolite Association

1st Edition

By Felix P. Lesnov

CRC Press

300 pages

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Description

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.

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

3.1 Berezovka massif

3.2 Shel’ting massif

3.3 Komsomol’sk massif

3.4 South Schmidt massif

4 Petrography of mafic-ultramafic massifs of the East Sakhalin ophiolite association

4.1 Restitic (orthomagmatic) ultramafic rocks

4.2 Hybrid (paramagmatic) ultramafic rocks

4.3 Orthomagmatic gabbroids

4.4 Hybrid (paramagmatic) gabbroids from endocontact zones with ultramafic rocks

4.5 Hybrid (paramagmatic) gabbroids of endocontact zones with enclosing rocks

5 Petrochemistry of rocks of mafic-ultramafic massifs of the East Sakhalin ophiolite association

5.1 Variations in the contents of major chemical components in petrogenetic rocks groups

5.2 Comparative description of petrogenetic groups of rocks based on the values of their petrochemical parameters

5.3 On systematization of ultramafic and gabbroid rocks based on the normalized values of their petrochemical parameters

5.4 The dependence of the chemical composition of ultramafic restites on the degree of partial melting of upper-mantle sources

6 Geochemistry of rocks of mafic-ultramafic massifs of the East Sakhalin ophiolite association

6.1 Distribution of Ca, K, and some impurity elements in rocks of the Berezovka massif (from XRF-SR data)

6.2 Geochemical parameters of rocks of the Berezovka massif (from XRF-SR data)

6.3 Distribution of rare earth elements in 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

8.1 Rock-forming minerals

8.2 Distribution coefficients of chemical components between coexisting rock-forming minerals

8.3 On the temperatures of chemical equilibrium of coexisting olivines, orthopyroxenes, and clinopyroxenes in ultramafic restites of the Berezovka massif

8.4 Accessory minerals

9 Distribution of rare earth elements in rock-forming minerals from mafic-ultramafic massifs of the East Sakhalin ophiolite association

9.1 Orthopyroxenes

9.2 Clinopyroxenes

9.3 Plagioclases

9.4 On the distribution coefficients of rare earth elements among coexisting clinopyroxenes, orthopyroxenes, and plagioclases

10 Isotope-geochronological and geochemical systematization of zircons from rocks of the Berezovka mafic-ultramafic massif

10.1 Description of the collection of zircons from rocks of the Berezovka massif

10.2 Methods for isotope dating and trace-element analysis of zircons

10.3 Morphology and optical properties of zircons

10.4 Isotopic age of zircons

10.5 Geochemistry of zircons

10.6 Specifics of zircon isotope dating of rocks of mafic-ultramafic massifs

11 The chromitite occurrences in mafic-ultramafic massifs of Sakhalin Island

11.1 Chromitite occurrences in the Berezovka and South Schmidt massifs

11.2 Chemical composition of chromitites

12 Geochemistry of platinum group elements and rhenium in rocks and chromitites of mafic-ultramafic massifs of Sakhalin Island

12.1 Geochemistry of PGE and Re in rocks

12.2 Geochemistry of PGE and Re in chromitites

12.3 On mineral-concentrator of PGE in chromitites of the Berezovka massif

13 The fundamentals of the concept of polygenetic formation of mafic-ultramafic complexes in ophiolite associations

Conclusions

About the Author

Felix P. Lesnov is Doctor of Geology and Mineralogy, Leading Research Fellow of the Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, and Member of the Russian Academy of Natural Sciences. He specializes in research on mafic–ultramafic complexes of folded areas (geology, petrology, petrochemistry, geochemistry, mineralogy, isotope geochronology, and chromite and Pt contents). The main study areas are the Chukchi region, Kamchatka region, Sakhalin Island, Primorye, northern Baikal region, eastern Transbaikalia, East and West Sayan, Tuva, Urals, Kyrgyzstan, Tajikistan, Mongolia, and Brazil. Felix Lesnov has (co-)authored more than 300 works, including more than ten monographs.

Subject Categories

BISAC Subject Codes/Headings:
SCI019000
SCIENCE / Earth Sciences / General
TEC003000
TECHNOLOGY & ENGINEERING / Agriculture / General