Comparative characteristics of indicator minerals of kimberlites and new perspectives diamond of the Ygyatta diamondiferous region (Western Yakutia)

The new data on the composition of kimberlite indicator minerals (KIM) — pyropes and picroilmenites — of the first kimberlite body T-54-14, opened in 2015 in the Syuldyukar kimberlite field by the geologists of ALROSA PJSC, during the verification of the anomaly T-54-14, have been given. The pyropes of the kimberlite body T-54-14 are rep-resented mainly by the differences of the lherzolite paragenesis, the concentration of pyropes of the diamondiferous dunite-harzburgite paragenesis is low and does not exceed 1,8%. Among the picroilmenites the low-chromium varieties prevail, with the content of magnesium 5—9 wt. % MgO, the low-magnesium high-chromium varieties are absent. The comparison data with KIM of Khatyryk (Syuldyukar field) and Vostochny (Ygyatta field) high-contrast halos, allocated within the Ygyatta diamondiferous region, have been provided. The pyropes from the Khatyryk halo are close in composition to the pyropes of the kimberlite body T-54-14, but show a higher concentration of manganese — 0,5 wt.% MnO. The picroilmenites from the Khatyryk halo are distinguished mainly by the presence of high-chromium high- and low-magnesium varieties. KIM from the Vostochny halo also have differences in the composition in comparison with the KIM of the kimberlite body T-54-14. A higher concentration of wehrlite (10%) and diamondiferous duniteharzburgite (7%) pyropes has been established, pyropes have a lower (0,45 wt.%) concentration of MnO, high-chromium low-magnesium varieties of picroilmenites have been identified. The presence of high-contrast halos of IMK, significant differences in the mineral composition, direct findings the diamonds and pyropes without marks of mechanical wears in the sedimentary Carbon and Permian deposits with low reservoir properties indicate a high pros-pect for the discovery of a industrial diamonds kimberlites in the Ygyatta region.

1. Vasilenko V.B., Tolstov A.V., Kuznetsova L.G., Minin V.A. Petrohimicheskie kriterii ocenki almazonosnosti kimberlitovyh mestorozhdenij Yakutii [Petrochemical criteria of diamond content evaluation of the Yakutian kimberlite deposits]. Geohimiya [Geochemistry] 2010, no. 4, pp. 366-376. (In Russian)

2. Gorev N.I., Gerasimchuk A.V., Protsenko E.V., Tolstov A.V. Tektonicheskie aspekty stroeniya Vilyujsko-Marhinskoj zony, ih ispol’zovanie pri prognozirovanii kimberlitovyh polej [Tectonic aspects of the structure of the Vilyui-Markha zone, their use in predicting kimberlite fields]. Nauka i obrazovanie [Science and Education], 2011, no. 3, pp. 5—10. (In Russian)

3. Yemelyanov V.S., Tolstov A.V., Boris E.I. Novye dannye o perspektivah korennoj almazonosnosti Vilyujsko-Marhinskoj zony razlomov [New data concerning native diamond content prospects of Viliuy-Markha fracture zone]. Voprosy metodiki prognozirovaniya i poiskov mestorozhdenij poleznyh iskopaemyh [Issues of mineral deposits forecasting and prospecting techni-ques], YB SU «SB RAS Publisher», Yakutsk, 2004, pp. 115-123. (In Russian)

4. Ignatov P.A., Bushkov K.Y., Stein Y.I., Tolstov A.V., Yanygin Y.T. Geologicheskie i mineralogo-geohimicheskie priznaki struktur, kontroliruyushchih almazonosnye kimberlity Nakynskogo polya Yakutii [Geological and mineralogical-geochemical features of the Nakyn field (Yakutia) diamon-diferous kimberlites controlling structures]. Rudy i metally [Ores and metals] 2006, no. 4. pp. 59 - 67. (In Russian).

5. Kalmykov B.A., Peletskiy M.N. Paleogeographical peculiarities of Khatyryk kimberlite minerals’ aureole formation. Collected papers from the Theoretical and practical conference devoted to the 30th anniversary of YaNIGP CSRMPI (ALROSA JSC) «Diamond deposits geology, location patterns, forecasting and prospecting techniques», Mirny, 1998, pp. 218-221. (In Russian)

6. Kostrovickij S.I., Specius Z.V., YAkovlev D.A., Fonder-Flaas G.S., Suvorova L.F., Bogush I.N. Atlas korennyh mestorozhdenij almazov Yakutskoj kimberlitovoj provincii. Otv. redaktor Pohilenko N.P. [Atlas of primary diamond deposits of Yakutian kimberlite province. Edited by N.P. Pokhilenko]. Mirny, LLC «MGT» Publ., 2015, 480 p. (In Russian)

7. Lapin A.V., Tolstov A.V., Antonov A.V. Izotopnyj sostav Sr- i Nd-kimberlitov i konvergentnyh s nimi porod Sibirskoj platformy [The Sr-Nd isotope composition of kimberlites and convergent rocks of the Siberian platform]. Doklady RAN [Doklady Earth Sciences] 2007, vol. 414, no. 1, pp. 78—82. (In Russian)

8. Lapin A.V., Tolstov A.V., Vasilenko V.B.Petrogeohimicheskie osobennosti kimberlitov Sredne-Marhinskogo rajona v svyazi s problemoj geohimicheskoj neodnorodnosti kimberlitov [Petrogeochemical peculiarities of kimberlites from Sredne-Markhinskii diamondiferous region in connection with the problem of kimberlite geochemical heterogeneity]. Geohimiya [Geochemistry], 2007, no. 12, pp. 1292-1304. (In Russian)

9. Maltsev M.V. Kriterii lokalizacii i veshchestvenno-indikacionnye priznaki Syul’dyukarskogo kimberlitovogo tela kak osnova prognozirovaniya mestorozhdenij almazov v Ygyattinskom rajone (Zapadnaya Yakutiya) [Localization criteria and real indication indicators of the Syuldyukarsky kimberlite body as a basis for predicting diamond deposits in the Ygyatta region (Western Yakutia)], Mirny, 2018, 24 p. (In Russian)

10. Maltsev M.V., Tolstov A.V., Starkova T.S., Ivanov A.S. Osobennosti veshchestvennogo sostava kimberlitov Syul’dyukarskogo polya (Zapadnaya Yakutiya) [Substance composition features of the Syuldyukar field kimberlites (Western Yakutia)]. Nauka i obrazovanie [Science and education], Yakutsk, 2017, no. 4, pp. 37-43. (In Russian)

11. Maltsev M.V., Tolstov A.V., Fomin V.M., Starkova T.S. Novoe kimberlitovoe pole v Yakutii i tipomorfnye osobennosti ego mineralov-indikatorov [A new kimberlite field in Yakutia and its indicator minerals’ typomorphic features]. Vestnik VGU. Seriya: Geologiya [VSU Herald. Issue series: Geology], 2016, no. 3, pp. 86-94. (In Russian)

12. Maltsev M.V., Tolstov A.V. New native diamond content prospects of Viliuy-Markha interfluve. Collected papers of the All-Russian theoretical and practical conference ARTPC-2017, Yakutsk, 2017, pp. 339-344. (In Russian)

13. Maltsev M.V., Tolstov A.V., Prospects of detection of new diamond deposits within West Yakutia (Viliuy-Markha interfluve, Ygyatta diamondiferous region). Geology and minerageny of North Eurasia. Collected papers from the conference devoted to the 60th anniversary of IPGG SB RAS, Novosibirsk, 2017, pp. 149-150. (In Russian) 

14. Protsenko E.V., Tolstov A.V., Gorev N.I. Kriterii poiskov kimberlitov i novye perspektivy korennoj almazonosnosti Yakutii [Criteria for searching for kimberlites and new perspectives of the core diamond-bearing potential of Yakutia]. Rudy i metally [Ores and metals], 2018, no.4, pp. 14—23. (In Russian)

15. TolstovA.V., Minin V.A., Vasilenko V.B., Kuznetsova L.G., Razumov A.N. Novoe telo vysokoalmazonosnyh kimberlitov v Nakynskom pole Yakutskoj almazonosnoj provincii [Anew highly diamondiferous kimberlite bodyin the Nakynfieldof the Yakutian diamondiferous province]. Geology and geophysics, 2009, vol. 50, no. 3, pp. 227 — 240. (In Russian).

16. Agashev A.M., Pokhilenko N.P., Tolstov A.V., Orihashi Y., Nakai S., Serov I.V., The Age of the Mirny field kimberlites (Siberia) and application of rutile and titanite for U-Pb dating of kimberlite emplacement by LA-ICP-MS. Geochemical Journal, 2016, vol. 50, no. 5, pp. 431—438.

17. Sobolev N.V., Tomilenko A.A., Tolstov A.V., Logvinova A.M., Kuz’min D.V., Sobolev A.V., Batanova V.G., Unique compo-sitional peculiarities of olivine phenocrysts from the post flood basalt diamondiferous Malokuonapskaya Kimberlite Pipe, Yakutia. Doklady Earth Sciences, 2015. vol. 463, no. 2, pp. 828—832.

18. Vasilenko V.B., Kuznetsova L.G., Minin V.A., Tolstov A.V. Evaluating the diamondiferous potential of unaltered kimberlites by the population models of their composition. Geochemistry International, 2012, vol. 50, no. 12, pp. 988—1006.