Early Proterozoic U-Pb Zircon Ages from Basement Gneiss at the Solovetsky Archipelago, White Sea, Russia

Schuth, Stephan; Gornyy, V.I.; Berndt, Jasper; Shevchenko, S. N.; Karpuzov, Alexandr F.; Mansfeldt, Tim

doi:10.4236/ijg.2012.32030

Cited by 53 publications

(12 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The analyses of U-Pb isotope ratios in zircon were carried out on a SHRIMP-II secondary-ion mass spectrometer at CIR VSEGEI using the method outlined in [32,33]. The intensity of the primary molecular oxygen beam was 4 nA; the size of the sampling crater was 20 × 25 μm with a depth of 2 μm.…”

Section: Methodsmentioning

confidence: 99%

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

Groshev

Karykowski²

2019

Minerals

View full text Add to dashboard Cite

The West-Pana intrusion belongs to the Paleoproterozoic Fedorova-Pana Complex of the Kola Region in NW Russia, which represents one of Europe's most significant layered complexes in terms of total platinum group element (PGE) endowment. Numerous studies on the age of the West-Pana intrusion have been carried out in the past; however, all published U-Pb isotope ages were determined using multi-grain ID-TIMS. In this study, the mineralized Main Anorthosite Layer from the upper portion of the intrusion was dated using SHRIMP-II for the first time. High Th/U (0.9-3.7) zircons gave an upper intercept age of 2509.4 ± 6.2 Ma (2σ), whereas the lower portion of the intrusion was previously dated at 2501.5 ± 1.7 Ma, which suggests an out-of-sequence emplacement of the West-Pana intrusion. Furthermore, high-grade PGE mineralization hosted by the anorthosite layer, known as "South Reef", can be attributed to (1) downward percolation of PGE-enriched sulfide liquid from the overlying gabbronoritic magma or (2) secondary redistribution of PGEs, which may coincide with a post-magmatic alteration event recorded by low Th/U (0.1-0.9) zircon and baddeleyite at 2476 ± 13 Ma (upper intercept).

show abstract

Section: Methodsmentioning

confidence: 99%

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

Groshev

Karykowski²

2019

Minerals

View full text Add to dashboard Cite

show abstract

“…The points for analysis were chosen within the grains based on their cathodoluminescence (CL) and optical images. Isotope measurements and processing of digital data were made, following the techniques accepted at the Center of Isotopic Research of the Russian Geological Research Institute (Schuth et al, 2012). The contents of impurity elements in zircons were measured by LA-ICP-MS on an Element (Thermo Finnigan Mat) mass spectrometer with a UP-213 Nd:YAG (New Wave Research) laser ablation system at the Analytical Center of the Institute of Geology and Mineralogy, Novosibirsk.…”

Section: Samples and Methods Of Studymentioning

confidence: 99%

Polygenesis of mafic–ultramafic complexes: Isotope-geochronological and geochemical evidence from zircons of the Berezovka massif rocks (Sakhalin Island)

Lesnov

Хлестов

Gal’versen

et al. 2015

Russian Geology and Geophysics

View full text Add to dashboard Cite

Results of comprehensive isotope-geochronological (U-Pb dating; SHRIMP II) and geochemical (LA-ICP-MS) studies of zircons from different rocks of the Berezovka polygenetic mafic-ultramafic massif of the East Sakhalin ophiolite association are presented. The massif includes three proximal but genetically autonomous structure-lithologic complexes of different ages: protrusion of ultramafic rocks of restite nature, gabbroid intrusion breaking through it, and contact reaction zone located along their boundaries. The isotopic age of zircons in the massif as a whole and in its individual rocks varies over a broad range of values. The zircons belong to several populations according to their age (Ma) and other features: relict and xenogenous (~3100-990, 70-410, and ~395-210) and syngenetic (~200-100, ~90-65, and ~30-20). They differ in grain size and morphology, optical and cathodoluminescence images, and trace-element patterns. By morphology, the grains are divided into short-prismatic crystals with well-developed faces and edges, long-prismatic crystals with well-developed faces and edges, prismatic crystals with slightly resorbed faces and edges, prismatic crystals with strongly resorbed faces and edges, and intensely resorbed grains totally or partly lacking faceting. The ages of zircons depend inversely on the contents of La, Ce, and Yb, total contents of REE, (Ce/Ce*) n , and (Eu/Eu*) n . Some grains are characterized by abnormal REE and trace-element patterns due to their epigenetic redistribution. The wide scatter of the intermediate ages of relict and xenogenous zircon grains, their resorption and disturbed optical and geochemical features are probably due to the nonuniform rejuvenation of their isotope systems and variations in other parameters, caused by the effect of younger mafic melt and its fluids, whose crystallization gave rise to a gabbroid intrusion dated at 170-150 Ma. The obtained data on the isotopic age and other properties of zircons from the rocks of the Berezovka massif agree with the geological model of its polygenesis.

show abstract

“…The U-Pb dating of zircon was carried out on a SHRIMP II ion microprobe by the standard technique (Schuth et al, 2012;Williams, 1998) at the Center of Isotopic Research, VSEGEI (St. Petersburg). Spots for the dating were selected with the use of optical (in transmitted and reflected light) and cathodoluminescence (CL) images showing the internal structure and zoning of zircon.…”

Section: Methodsmentioning

confidence: 99%

The U–Pb age and Lu–Hf isotope composition of detrital zircon from metasedimentary rocks of the Onot greenstone belt (Sharyzhalgay uplift, southern Siberian craton)

Turkina

Сергеев

Капитонов

2014

Russian Geology and Geophysics

View full text Add to dashboard Cite

We present data on the composition of metasedimentary rocks from the greenstone belt of the Onot terrane (Sharyzhalgay uplift) and results of U-Pb dating (SHRIMP II) and Lu-Hf isotope study of detrital zircon from garnet-staurolite schists. The metasedimentary rocks of the Onot greenstone belt are dominated by garnet-and staurolite-bearing schists alternating with amphibolites (metabasalts) in the upper part of the section. Compositionally the protoliths of garnet-staurolite schists correspond to sedimentary rocks, ranging from siltstone to pelitic mudstone. The trace-element characteristics of the garnet-staurolite schists indicate that the terrigenous material was derived from three different rock types, such as tonalite-trondhjemite plagiogneisses (elevated Gd/Yb ratios), mafic rocks (elevated Cr/Th ratios and reduced Th/Sc ratios), and felsic igneous rocks formed by crustal melting (the presence of a Eu minimum), which agrees with the set of potential source rocks from the Onot terrane. The age of predominant detrital zircon reflects the erosion of mainly Neoarchean igneous rocks; this fact, combined with the poor rounding of zircon and tectonically active sedimentation conditions accompanied by mafic volcanism, suggests that the probably depositional age is ca. 2.7 Ga. Older source rocks (2.80-3.35 Ga) contributed to the sediment deposition along with the Neoarchean ones. According to the Hf isotope composition of detrital zircon from the garnet-staurolite schists, the source provenances had different crustal prehistories. The source provenances include Paleoarchean and juvenile Neoarchean crust and rocks formed by the mixing of melts from ancient and juvenile crustal sources.

show abstract

Early Proterozoic U-Pb Zircon Ages from Basement Gneiss at the Solovetsky Archipelago, White Sea, Russia

Cited by 53 publications

References 26 publications

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

The Main Anorthosite Layer of the West-Pana Intrusion, Kola Region: Geology and U-Pb Age Dating

Polygenesis of mafic–ultramafic complexes: Isotope-geochronological and geochemical evidence from zircons of the Berezovka massif rocks (Sakhalin Island)

The U–Pb age and Lu–Hf isotope composition of detrital zircon from metasedimentary rocks of the Onot greenstone belt (Sharyzhalgay uplift, southern Siberian craton)

Contact Info

Product

Resources

About