Zircon U-Pb Geochronology Recorded Late Cretaceous Fluid Activation in the Central Aldan Gold Ore District, Aldan Shield, Russia: First Data

Leontev, Vasilii Ivanovich; Скублов, С. Г.; Shatova, N. V.; Березин, А. В.

doi:10.1007/s12583-020-1304-z

Cited by 10 publications

(6 citation statements)

References 47 publications

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“…Mica shows plastic deformations (Figure 6f), which are consistent with the concept of early syngenetic protoclase of rock-forming and accessory minerals of rare-metal granites associated with increased fluid pressure [10,27]. Zircon and xenotime occur together, both as the intergrowth of weakly altered grains of both minerals and as xenotime microinclusions in strongly altered zircon grains formed in the recrystallization and/or dissolution-precipitation processes (Figure 7a,b).…”

Section: Zircon Mineral Associationssupporting

confidence: 83%

Complex Characteristic of Zircon from Granitoids of the Verkhneurmiysky Massif (Amur Region)

2021

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The study presents a complex characteristic of zircon from the Verkhneurmiysky intrusive series with Li-F granites. A wide range of morphological and chemical properties of zircon allowed us to obtain new information on the formation and alteration of zircon from biotite and zinnwaldite granitoids and to determine its features, which contribute to the correct definition of Li-F granites formed directly before the tin mineralization. The reviled trends of zircon morphology and composition evolution in the Verkhneurmiysky granites series are: the high-temperature morphotypes are followed by low-temperature ones with more complicated internal structure with secondary alteration zones, mineral inclusions, pores, and cracks; the increasing concentration of volatile (H2O, F), large ion lithophile (Cs, Sr), high field strength (Hf, Nb) and rare-earth elements with decreasing crystallization temperatures and the determining role of the fluid phase (predominantly, F) in the trace element accumulation. The composition of zircon cores in biotite and zinnwaldite granites is very similar. However, the zircon rims from zinnwaldite granites are much more enriched in trace elements compared to those from biotite granites. The first study of zircon from the Verkhneurmiysky granitoids provides new data on the formation and alteration conditions of granitoids, including zinnwaldite ones.

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Section: Zircon Mineral Associationssupporting

confidence: 83%

Complex Characteristic of Zircon from Granitoids of the Verkhneurmiysky Massif (Amur Region)

2021

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“…Mur: 135.2; 135.8 [49]; MurV: 136.6 [49] Amg: 132.3; *131.4 [51]; 129.1 [31] Lbd: 129; 130 [31] *130.3; *130.0 [14,30] Ald: *133.4; 133.9 [36]; 134 [29,47]; *135.9 [14,36];…”

Section: о разновременности позднемезозойского магматизма и связанног...mentioning

confidence: 99%

“…125.8; 124.9; 125.2 [37] MurV: 142.7 [49] Amg: 133.4 [32]; 134.9 [51] Ald: *133.0 [30] 133.2 [ [26]), так и коровых субщелочных диоритоидно-гранитоидных расплавов (на определённом удалении от упомянутых контактов [25]).…”

Section: ; 130 [2]unclassified

The Age of Gold Mineralization in the Ketkap-Yuna Igneous Province, Formational Types of Gold-Bearing Complexes, and Time Differences in the Occurrence of Late Mesozoic Magmatism in Different Parts of the Aldan Shield

Polin¹,

Zvereva²,

Travin³

et al. 2022

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The first 40Ar/39Ar isotopic age data for hydrothermal vein gold mineralization in the late Mesozoic Ketkap-Yuna igneous province of the Aldan shield confirm the correlation between this style of mineralization and the Early Cretaceous sub-alkali magmatism, which was established by geological observations. The combination of geological characteristics and U-Pb data on magmatites enabled us to indirectly determine the age of the highly productive bimetasomatic «massif-skarn» type of mineralization associated with sub-alkali magmatogenic formations of the province. The isotopic dating of magmatites and gold mineralization in the Ketkap-Yuna igneous province and other late Mesozoic igneous provinces of the Aldan shield shows consistency in the ages of ore-bearing magmatites and associated ores. The delay in time of the Late Mesozoic magmatism manifestations in the Ketkap-Yuna igneous province and the associated gold mineralization relative to the intensification of tectonomagmatic processes in the Western and Central Aldan, as well as differences in the correlations of different types of igneous formations in the provinces, are explained by the characteristics of the regional tectonic structure and, as a consequence, the specific nature of the Late Mesozoic magmatism development in different parts of the Aldan shield. Two large areas of the late Mesozoic intensification of tectonomagmatic processes are identified in the Aldan shield that differ both in the time of the onset of polyformational magmatism and the accompanying different-type mineralization, and in the dominant formational type of magmatites: West-Central Aldan, on the one hand, and East Aldan, on the other. The former is characterized by continuous magmatic activity from the Berriasian to the early Albian (≈ 30 Ma) and predominance of the leucitite–alkali-(foid)-syenite formation, and the latter by manifestations of magmatism over a timeframe half of the above period (≈ 15 Ma) and predominance of the subalkaline diorite-granodiorite-granite formation. The termination of the late Mesozoic magmatism in both areas was subsynchronous. A «set» of magmatogenic formations in them is also similar: leucite-alkaline-(foid)-syenite with alkali granites, monzonite (shonkinite)-syenite and subalkaline diorite-granodiorite-granite. The Coniacian–Santonian outbreak of alkali volcano-plutonism during the intensification of tectonomagmatic processes is characteristic of the East Aldan region, which manifested itself in the Ketkap-Yuna igneous province after a long (about 30 Ma) period of amagmatism.

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“…Более поздние проявления магматизма, зафиксированные в Кеткапско-Юнской магматической провинции Алданского щита, протекали около 87 млн лет назад [12]. Схожие значения возраста в Центрально-Алданском рудном районе получены по единичным зернам циркона из сиенитов Рябинового массива (76-83 млн лет) и по циркону из кварц-полевошпатовых метасоматитов Самолазовского месторождения (83 ± 11 млн лет) [25]. Магматические тела Алданской магматической области в пределах Центрально-Алданского рудного района представлены лейцит-щелочносиенитовым, монцонит-сиенитовым, фергусит-дунитовым формационными типами.…”

Section: геологическая характеристикаunclassified

The First Data on the U-Pb Age and Composition of Zircons From Ore-Bearing Syenites of Gora Rudnaya (South Yakutia)

Guzev¹,

Terekhov²,

Скублов³

et al. 2021

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The isotope-geochemical study (SHRIMP-II, SIMS) of zircons from syenites of Gora Rudnaya (South Yakutia) was carried out. Gora Rudnaya is a syenite massif in the form of a laccolith. It is located within the Central Aldan ore district and includes the recently discovered Morozkinskoye gold deposit. Vein and vein-disseminated gold mineralization occurs in low-temperature acid metasomatites – beresites (Qz-Ser-Ank-Py). Mineralization is restricted to steeply dipping submeridional crush zones within the intrusion. According to the zircon dating data, the age of ore-bearing syenites is about 130 Ma. The obtained age corresponds to the main stage of magmatism and the associated hydrothermal-metasomatic activity within the Central Aldan ore district. Two groups of zircons have been distinguished in syenites. The first group is characterized by features of magmatic genesis. For the second group of zircons, there is evidence of the influence of fluids on zircons: increased content of U, Th, and some non-formula elements (LREE, Ca, Ti, Sr). The presence of two varieties of zircons that are contrasting in composition and appearance, but of the same age, indicates that the magmatic crystallization of syenites from Gora Rudnaya and their fluid processing occurred simultaneously.

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Zircon U-Pb Geochronology Recorded Late Cretaceous Fluid Activation in the Central Aldan Gold Ore District, Aldan Shield, Russia: First Data

Cited by 10 publications

References 47 publications

Complex Characteristic of Zircon from Granitoids of the Verkhneurmiysky Massif (Amur Region)

Complex Characteristic of Zircon from Granitoids of the Verkhneurmiysky Massif (Amur Region)

The Age of Gold Mineralization in the Ketkap-Yuna Igneous Province, Formational Types of Gold-Bearing Complexes, and Time Differences in the Occurrence of Late Mesozoic Magmatism in Different Parts of the Aldan Shield

The First Data on the U-Pb Age and Composition of Zircons From Ore-Bearing Syenites of Gora Rudnaya (South Yakutia)

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