ON THE COMPOSITION AND ZONING OF ACCESSORY MINERALS OF ALKALINE-ULTRABASIC ROCKS AS AN INDICATOR OF THE COMPOSITION AND PECULARITIES OF PRIMARY MAGMATIC DIFFERENTIATION

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作者：
RASS, IT
LAPUTINA, IP
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来源：
GEOKHIMIYA | 1995年 / 05期
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中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The composition and zoning of perovskite and apatite crystals of 30 samples of alkaline-ultrabasic rocks and carbonatites from massifs (Guli, Kugda) of Meimecha-Kotuy province (NW of Siberian platform) and Turiy of Karelian-Kola province (Kola peninsula) was studied. It was established that main components of studied minerals are weakly variable whereas the content of FeO, Mb(2)O(5), SrO, La2O3 and CeO2 in perovskites and SrO, La2O3, and CeO2 in apatites are found to be variable along 3 trends: from the center to the peripheric zones of crystals; in successive derivates of the alkaline-ultrabasic rocks; in different massifs. It was shown that the distribution of elements in the zonal crystals is governed by the petrological type of alkaline-ultrabasic rocks. The latter are differing in melilite content and are considered as representatives of two different rocks series being derived from different initial magmas.
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页码：720 / 732
页数：13
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