Abstract. 1. Introduction
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1 Abstract 1. Introduction
2 2. Geological position and host volcanics
3 3. Summary of primary mineralogy of Tirich and other peridotites of Dzhilinda River Figure 1. Composition of clinopyroxenes from the Dzhilinda basanites.
4 4. Petrography and mineral chemistry of host basanite Figure 2. Back-scattered electron image (BEI) of host basanite from Dzhilinda River. A, texture of groundmass and phenocrysts. B, coexistence of albite (Ab), plagioclase (Plag), and nepheline (Neph). Ol, olivine, Cp, clinopyroxene, Mt, Ti-magnetite, Ap, apatite.
5 5. Petrography of veinlets and melt pockets in Ti-rich peridotite
6 Figure 3. BEI of interstitial assemblages in Ti-rich xenoliths from Dzhilinda River. A, Sample DY-8A, olivine and spinel recrystallization by impregnation of basanite melt. Note growth of clinopyroxene after orthopyroxene near large orthopyroxene grain. B, Sample DJ-1, melt pockets near spinel recrystallization boundaries. C, Sample DY-8A, orthopyroxene (grey) and rutile (white) lamellae in clinopyroxene. D, Sample DJ-1, sulfide chain in clinopyroxene grain. San, sanidine; Rut, rutile; Ar, armalcolite. See Fig. 2 for other abbreviations. Figure 4. BEI of interstitial rutile in Ti-rich xenoliths from Dzhilinda River. A-B, Sample DJ-1, large rutile grains in close intergrowth with spinel. Note recrystallization of spinel and rutile by impregnation of basanite melt. C-D, Sample DY-8A, rutile grain in the melt pocket, (D, reaction rim of loveringite (Lov) at the rutile grain (see Table 3). See Fig. 2-3 for abbreviations.
7 Figure 5. BEI of interstitial goethite in Ti-rich xenoliths from Dzhilinda River. A-B, Sample DJ-1, large goethite grains in interstitial melt pocket and its texture (B). C-D, Sample DY-8A, elongated goethite near clinopyroxene grain (C) and goethite inclusions replacing sulfide (?) in spinel (D). Go, goethite; Ap, apatite; Amp, amphibole; S, sulfide; Ilm, Ilmenite. See Fig. 2-3 for other abbreviations. 6. Mineral chemistry of microlites and minor phases in Ti-rich peridotite
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10 Figure 6. Feldspar and feldspathoid compositions from microlites in Ti-rich xenoliths in the diagram Na 2 O-CaO-K 2 O. Figure 7. Compositional variations of Ti-oxide minerals in Ti-rich peridotite xenoliths and host basanite of Dzhilinda River. Open symbols, data from Kalfoun et al. (2002) for minerals from peridotite xenoliths of Sikhote-Alin (Russian Far East).
11 Figure 8. Composition of sulfide from minerals in Ti-rich peridotite of Dzhilinda River. Triangle, chalcopyrite. Compositional range of MSS at 1000 (grey field), pentlandite, and viterite-polydimite (bold lines) are taken from Szabo and Bodnar (1995). Compositional fields of pentlandite and viterite from peridotite xenoliths of Northern Hungary is after Szabo and Bodnar (1995).
12 7. Discussion
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