Metasomatized Xenoliths of Mantle Eclogites and Garnet Pyroxenites from the V. Grib Kimberlite, Arkhangelsk Province

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
N. M. Lebedeva, A. A. Nosova, L. V. Sazonova, Y. O. Larionova
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引用次数: 1

Abstract

We investigated mantle eclogite and garnet pyroxenite xenoliths from the V. Grib kimberlite located in the Arkhangelsk diamond province. The eclogites in the lithospheric mantle beneath the Arkhangelsk province were strongly modified by metasomatic processes, which totally obliterated the primary features of protolith. Detailed studies of the xenoliths allowed us to distinguish the following metasomatic events: (1) early mantle metasomatism and (2) interaction with kimberlite melt. During the multiple early mantle metasomatism, primary clinopyroxene and garnet were replaced by metasomatic clinopyroxene, garnet, amphibole, calcite, and phlogopite under the influence of carbonated ultramafic melts. The impact of kimberlite melt caused the dissolution and recrystallisation of solid-phase inclusions and formation of melt pockets consisting of serpentine, chlorite, carbonate, spinel, perovskite, amphibole, recrystallized garnet, and clinopyroxene. En route to the surface in kimberlite melt, the xenoliths were disintegrated and primary garnet and clinopyroxene were metasomatized with increasing Ti and Cr contents, up to formation of high-Cr megacrysts. The garnet pyroxenites are represented by high-Ca, low-Mg and low-Ca, high-Mg types. It is shown that the high-Ca, low-Mg garnet pyroxenites can be the final products of the eclogite xenolith metasomatism by carbonated ultramafic melts. The low-Ca, high-Mg pyroxenites were derived through the interaction of a partial eclogite melt with depleted peridotites.

Abstract Image

阿尔汉格尔斯克省V. Grib金伯利岩中地幔榴辉岩和石榴石辉石岩的交代捕虏体
研究了位于阿尔汉格尔斯克钻石省V. Grib金伯利岩的地幔榴辉岩和石榴石辉石岩包体。阿尔汉格尔斯克省岩石圈地幔中的榴辉岩受到交代作用的强烈改造,完全湮没了原岩的基本特征。对包体的详细研究使我们能够区分以下交代事件:(1)早期地幔交代作用和(2)与金伯利岩熔体的相互作用。在早期地幔的多次交代作用中,受碳酸盐超镁铁质熔体的影响,原生斜辉石和石榴石被交代斜辉石、石榴石、角闪石、方解石和辉云母所取代。金伯利岩熔体的影响导致固相包裹体的溶解和再结晶,形成由蛇纹石、绿泥石、碳酸盐、尖晶石、钙钛矿、角闪孔、再结晶石榴石和斜辉石组成的熔体袋。在金伯利岩熔体走向地表的过程中,捕虏体破碎,原生石榴石和斜辉石随着Ti和Cr含量的增加而交代,最终形成高Cr巨晶。石榴石辉石岩分为高钙低镁型和低钙高镁型。结果表明,高钙、低镁石榴石辉石岩可能是超镁质碳酸盐熔体对榴辉岩捕虏体交代作用的最终产物。低钙、高镁辉石岩是部分榴辉岩熔体与贫橄榄岩相互作用形成的。
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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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