Geochemistry and geochronology of the Proterozoic magmatic rocks of the Ulkan trough: New data

Диденко, А. Н.; Guryanov, V. A.; Peskov, A. Yu.; Perestoronin, A. N.; Авдеев, Д. В.; Bibikova, Elena; Kirnozova, T. I.; Fugzan, M. M.

doi:10.1134/s1819714010050040

Cited by 22 publications

(13 citation statements)

References 21 publications

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“…Granitoids of the Ulkan massif differ from granites of the South Uchur massif by higher Be, Nb, Ta, Li, Sn, TR, Rb, U and Th cont ent s and deplet ion in Ba и Sr. Alkaline granitoids are highly enriched in most of the incompatible elements as well as Zn, Mn, F and precious metals [18]. Spider diagrams for these rocks are similar to those for typical anorogenic rare metal alkaline granites [4,23]. Geochemical data and findings of the isotope-geochronological study on rocks of the Ulkan VPC are indicative of the OIB source for the alkaline (Na-series) granites and the essentially lithospheric source for sub-alkaline (К -series) granites [12,23].…”

Section: Sources and Geodynamic Settings Of The Ulkan Vpc Formationmentioning

confidence: 62%

“…According to A.N. Didenko et al [4,5], the age of the 1st and 3rd phase granites (U-Pb zircon method) from this massif is 1729.7±1.9 Ma and 1724.7±3.6 Ma, respectively.…”

Section: General Geology and Previous Studiesmentioning

confidence: 99%

“…Data on the chemical composition and distribution of rare and rare earth elements in volcanics and granitoids of the Ulkan VPC and these data analysis are given in a number of publications [4,12,23 and others]. On classification diagrams, the plotted compositions of sub-alkaline and alkaline granites and volcanics of the Ulkan graben occur within the fields of the plotted compositions of rocks of the alkaline and alkali-lime series while on discrimination diagrams within the field of intra-plate granites.…”

Section: Sources and Geodynamic Settings Of The Ulkan Vpc Formationmentioning

confidence: 99%

“…Trachyrhyolite, trachyrhyodacite and trachydacite are mostly present in the section of the Elgete Formation, basaltoids constituting not more than 20% of the Formation and comendite and pantellerite occurring only in the upper part of the section. The age of Elgete trachyrhyolites is estimated to be 1722±6 Ma (U-Pb method on zircons [23,29]) and that of trachyrhyodacite 1732±4 Ma (U-Pb method on zircons [4,5]). The Elgete Formation rests with angular unconformity either on the Ulkachan or Toporikan Formations and beyond their occurrence it overlies the crystalline basement.…”

Section: General Geology and Previous Studiesmentioning

confidence: 99%

“…The well exposed south-western branch of the Ulkan-Bilyakchan belt, i.e. the Ulkan graben (trough), has received the most study by us [4,5,12,16,17,21]. A-type granites bearing ample evidence of being post-kinematic are of widespread occurrence in the graben and within structures surrounding it [23].…”

Section: General Geology and Previous Studiesmentioning

confidence: 99%

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Ulkan Paleorift Structure in the South-Eastern Environs of the Siberian Platform: Age, Conditions, Sources, and Geodynamic Setting

Guryanov¹,

Peskov²

2017

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Abstract. This paper attempts to summarize and systematize findings of geological, geophysical, geochronological and geochemical studies over the past three decades on Late Paleoproterozoic granitoids, basites and sedimentary-volcanic rocks of the Ulkan trough in the southeastern flanking of the Siberian Platform, which make it possible to identify their sources and to reconstruct conditions and geodynamic settings of their formation. Rocks of the Ulkan volcano-plutonic complex are found to form in an anorogenic environment under intra-continental extension in relation to the mantle plume activity at 1.77 -1.70 Ga. Based on geodynamic criteria, five stages recognised in the evolution of the Ulkan paleorift system can be grouped into three major stages of the Late Paleoproterozoic intra-plate magmatism. The study of data made it apparent that the Ulkan paleorift system has characteristics of a three-armed structure indicative of the intense rifting in response to the hot spot activity; the Ulkan alkaline-granitic batholith with its distinct metallogenic specialization for rare-earth elements (REE) and rare earth metals (REM) could be such a hotspottype diapir. Tectonically, the triple junction appears as a zone that underwent intense intra-plate alkaline-granitic magmatism in the Late Paleoproterozoic and hosts ore targets unique in scale and diversity (Be, Ta, Nb, TR, Zr, U, Au, Li, Sn, Mo, P, and Ti) with ages in the 1.72 -1.67 Ga range. Rare-metal and REE deposits are essentially the product of rare-metal alkaline granitic magmatism and most likely related to the evolution of the mantle source in the course of plume activity. The presence of both subalkaline granitoids and volcanic rocks (K-series) and alkaline granites, comendites and pantellerites (Na-series) intensely fractionated and enriched to a maximum degree in most noncoherent elements, as well as Zr, Mn, F, Fe, Ti, is characteristic of the Ulkan anorogenic magmatism. Granitoids of the Ulkan paleorift structure and its southern flanking foldbelts have mixed mantle-crustal sources. Subalkaline granites are derived from a source containing material from lower continental crust and alkaline granites from a mantle source containing the OIB-type component. The origin of the Ulkan-Bilyakchan volcano-plutonic belt initiated as an intracontinental system along the southeastern edge of the Siberian Platform is considered to be related to hot spots of this type.

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Section: Sources and Geodynamic Settings Of The Ulkan Vpc Formationmentioning

confidence: 62%

“…According to A.N. Didenko et al [4,5], the age of the 1st and 3rd phase granites (U-Pb zircon method) from this massif is 1729.7±1.9 Ma and 1724.7±3.6 Ma, respectively.…”

Section: General Geology and Previous Studiesmentioning

confidence: 99%

Section: Sources and Geodynamic Settings Of The Ulkan Vpc Formationmentioning

confidence: 99%

Section: General Geology and Previous Studiesmentioning

confidence: 99%