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New data on geology, petrochemistry and geochemistry of rocks of the Nizhnetarlashkynsky ultramafite massif (Western Sangilen, Eastern Tuva)

Mafic-ultramafic massifs of Tuva territories are located both within linear belts tracing deep faults and as “disordered” areas associated with some belts sufferedthe later fold-block dislocations. Sometimes fragments of mafic-ultramafic bodies are present in granitoidal intrusive asxenogenic blocks of various sizes. Areal location of ultramafic massifs is particularly observed in the east of Tuva within the Khamsarynsky structural-formation zone as well as in the structures of the Tuvinian-Mongolian middle massif. Geochemical features of the ultramafic massi frock variety studies are continued for obtaining convincing conclusions on their formational affiliation. Ultramafic massifs of Tuva have isolated single data in terms of the geochemical characteristics which requires a purposeful work in this direction. The present paper summarizes for the first time petro-geochemical characteristics of dunites of the Nizhnetarlashkynsky ultramafic massif and fragments of individual picritic dikes among them.

Areal location of ultramafic massifs is not uncommon;their location isparticularly known in the east of Tuva within the Khamsyrinsky structural-formational zone as well as in structures of the Tuvan-Mongolian middle massif among the highly-metamorphic deposits of the Proterozoic. One of such mafite-ultramafite bodies is the Nizhnetarlashkynskyultramafite massif located within the Western Sangilen as well as some new data on geology, petrochemistry and geochemistry presented below.
The Nizhnetarlashkynsky ultramafite massif is outcropped both sides of the mid-channel valley of the Tarlashkynriver (502658,28N; 95957,16 E). Antalusite-sillimanite and cordierite-bearing crystalline schists and gneisses of the Mugursky suite (Proterozoic) outcropped within the massif. This ultramafiс massif contactsthe Pravotarlashkynsky gabbroid complexon the right bank of the river, and it contacts the Bashkhymugursky granitoid massif in the northeast and east. There are many small blocks of marbles and marble limestones (the Morensky suite) as well as bodies of leucogranites among the ultramafiс rocks.
The total REE content in dunites of the Nizhnetarlashkinsky massif range within 0,27-1,60 g/t which is much higher than the average total content of these impurities in dunites from the Samail (Oman) massif (Table 1).   (1) and picrites (2) of the Nizhnetarlashkynky massif.  Abnormally high levels of light REE in the studied dunites which are not characteristic of restitogenic ultramafites are causally related to the presence of structurelessimpurity of these elements added by epigenetic fluids and concentrated in intergranular and intragranularrock microcracks. Decreased values of Rb, Ba, K, Nb, La, Ce, Pb and ratios Nb/Ta,Zr/Hf, U/Th, Ce/Yb of the initial mantle indicate the belonging of dunites (olivinites) of this massif to the depleted mantle.
It will be remarked that a small rock fragment cash indunite massdetermined by us as a picrate was found among the dunites of the investigated massif at paramerers (502658,40 N; 95104,02E). Xenoliths of spinel lherzolites were found as part of the kamtonite dikes of the Agardagsky complex within the neighboring Pravotarlashkynsky gabbroid complex among the granitoids of the Bashkhymugursky massifs and inclosing antalusite-sillimanite cordierite-containing shales and gneisses of the Mugursky suite [2]. Such formations were found for the first timeamong dunites. This macroscopically black fine-grained rock has a massive texture and poikilitic structure and has the following quantitative-mineral composition (%): clinopyroxene (35), olivine (30 %), serpentine (20), green spinel (10-15), ore mineral (1), carbonate (<1). There are inclusions of olivine and green spinel sized within 0,01-0,1 mm in clinopyroxene oikocrystalssized within 0,7-1,5 mm. In some sample parts fine-grained rock structure is changed to coarse-grained light rock with the same mineral composition but containing singular occurrence of green spinel. It was found that the picrites from the Nizhnetarlashkynsky massif are close to them for TiO 2 , FeO, MgO, CaO, Na 2 O and K 2 O content but more depleted than SiO 2 and Al 2 O 3 (     The two analyzed picrite samples differ according to the total REE content, in both cases sufficiently high REE is observed (Table 3).  Positively inclined distribution spectra of REE content normalized in chondriteshave a similar configuration but they differ in position on the diagram as well as in the character of the Eu anomalies due to differences in the level of their accumulation ( Figure 4). The resulting data can be assumed that the investigated picrites form one of the tectonically disintegrated dikes cutting the dunites of the Nizhnetarlashkynsky massif.
Nemtsovich has distinguished the Agardagsky dike complex within the Western Sangilen represented by lamprophyres and essexite diabases [3]. These dykes were further studied by [4] etc. and after by [2]. Dykes break through heterochronous metamorphic and magmatic formations and often contain deep xenoliths. It can be assumed that this xenolith is also a substance of the lithospheric mantleaccording to the geological position of the Nizhnetarlashkynsky ultramafic massif.