词汇 | xenolith |
释义 | BETA Examples of xenolithxenolith isn’t in the Cambridge Dictionary yet. You can help! The evidence, including that of xenoliths carried in the magmas, supports the idea of melting of old metasomatized lithospheric mantle, usually associated with rifting tectonics. To the east of the laguna the lavas contain angular xenoliths of more basic lava, while to the west they appear massive and lack xenoliths. This work attempts to define metamorphic conditions through an in-depth study of various types of metamorphosed xenoliths, with various mineral assemblages and their chemical compositions. Small amounts of calcite and dolomite can appear sporadically in silica xenoliths, but are more common in calc-silicate xenoliths. Metabasaltic xenoliths (samples no. 74 and no. 79) are abundant within the gabbros and wehrlites exposed along the crest of this ridge. In the tridymitic xenoliths, silica is not associated with calc-silicate minerals that can help to indicate pressure and temperature conditions. Layers wedge out along the upper part of a xenolith just below and to the left of the hammer. However, there are significant differences between the two analysed xenoliths. Since it is not exposed, this can only be attempted by using xenoliths derived from these basements. Cores consisting of xenoliths or large megacrysts have not been observed. While xenoliths do not show any meaningful variation, due to the quartz-rich mineralogy, composition of melt inclusions shows some inter-elemental cor relations. However, they also refer to it as an intrusion 'largely devoid of internal structure' in which 'layering, mineral fabric, xenoliths and pegmatites are uncommon'. Despite a diligent search no peridotite or other deepseated xenoliths have been encountered. The intrusion contains abundant megacryst-bearing microdioritic inclusions which are distinct from the country rock xenoliths that are also sparsely present in the granite. Solid symbols represent silicate melt inclusions and interstitial glasses of magmatic xenoliths (clinopyroxenites, glass-bearing fergusites, and foid-bearing syenites). |
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