000			02836 a2200289 4500
001			1351852213
005			20250317111626.0
008			250312042017xx eng
020			_a9781351852210
037			_bTaylor & Francis _cGBP 48.99 _fBB
040			_a01
041			_aeng
072	7		_aRBGB _2thema
072	7		_aTN _2thema
072	7		_aRBGB _2bic
072	7		_aTN _2bic
072	7		_aSCI019000 _2bisac
072	7		_aTEC003000 _2bisac
072	7		_aTEC009020 _2bisac
072	7		_a552.091645 _2bisac
100	1		_aFelix P. Lesnov
245	1	0	_aPetrology of Polygenic Mafic-Ultramafic Massifs of the East Sakhalin Ophiolite Association
250			_a1
260			_bCRC Press _c20170112
300			_a318 p
520			_bThe 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.
999			_c6303 _d6303