Identification of the ca. 720 Ma Irkutsk LIP and its plume centre in southern Siberia: The initiation of Laurentia-Siberia separation

Ernst, Richard E.; Гладкочуб, Д.П.; Donskaya, T. V.; Pisarevsky, Sergei; Мазукабзов, А. М.; Bilali, Hafida El

doi:10.1016/j.precamres.2023.107111

Cited by 6 publications

(4 citation statements)

References 37 publications

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“…This time span of about 25 Ma is also related to the emplacement of other massifs of biotite pyroxenite, ijolite, urtite, alkaline syenite, and carbonatites within the southern and southwestern marginal parts of the Siberia and Zhidoy complexes (632 ± 2 Ma [19]), the Arbarastakh complex (650-638 Ma [36]), the Ingili complex (654 ± 7 Ma [19]), and the Tatarsky complex (630 Ma [37,38]). At the same time, Neoproterozoic mafic dike swarms within the southeastern and southern parts of the Siberian craton were emplaced about 100 Ma earlier, between 725 and 710 Ma [35,39,40], and demonstrated that at 720 Ma, the center of the Irkutsk plume occurred within the studied area, providing very good correlations with the 720 Ma Franklin plume center of northern Laurentia. The 720 Ma Franklin-Irktusk LIP event marks an attempted initial separation of southern Siberia from northern Laurentia during the breakup of Rodinia.…”

Section: Discussionmentioning

confidence: 61%

“…Variations in the chemical composition of rocks from three complexes indicate that the parental melts were separated from different magmatic chambers that were generated during the same episode of mantle melting. According to the 40 Ar/ 39 Ar phlogopite data obtained for aillikite, damtjernite, and picrite from basic dikes from the northern part of the Eastern Sayan province (650-620 Ma), the rock formation in the dike complex of the region was related to the same stage.…”

Section: Discussionmentioning

confidence: 99%

“…Within the past decade, numerous geochronological data have been obtained concerning the age of the Eastern Sayan province complexes, with estimates ranging from 645 to 622 Ma. Thus, available geochronological data (ID-TIMS U-Pb garnet and phlogopite 40 Ar/ 39 Ar) have been obtained only for the Belaya Zima complex, with estimates ranging from 622 to 645 Ma (according to ID-TIMS U-Pb analysis [12], 40 Ar/ 39 Ar dating [17,18], and ID-TIMS U-Pb analysis of zircon [19]). An Sm-Nd isochron age of 640 ± 11 Ma was obtained for rocks of the Bolshaya Tagna complex [20].…”

Section: Introductionmentioning

confidence: 99%

“…An Sm-Nd isochron age of 640 ± 11 Ma was obtained for rocks of the Bolshaya Tagna complex [20]. 40 Ar/ 39 Ar dating of phlogopites from rocks of the dike series provided two plateaus, with ages of 644 ± 9 and 646 ± 9 Ma [18].…”

Section: Introductionmentioning

confidence: 99%

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Timing of Carbonatite Ultramafic Complexes of the Eastern Sayan Alkaline Province, Siberia: U–Pb (ID–TIMS) Geochronology of Ca–Fe Garnets

et al. 2023

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In this study, we present the results of U–Pb (ID-TIMS) geochronological studies of calcic garnet from the alkaline ultramafic complexes of Eastern Sayan province (eastern Siberia). New U–Pb ID–TIMS garnet ages obtained from different rocks of Bolshaya Tagna (632 ± 2 Ma) and Srednaya Zima intrusions (624 ± 5 Ma), as well as previously published garnet ages of the Belaya Zima complex (646 ± 6 Ma), allow us to constrain the timing and duration of episodes of alkaline ultramafic magmatism in Eastern Sayan province (619–651 Ma). Variations in the chemical compositions of rocks from three massifs indicate that the parental melts were separated from different magmatic chambers generated during the same episode of mantle melting. This study further highlights garnet U–Pb dating as a potentially robust, high-resolution geochronometer to constrain the evolution of the main pulse of alkaline ultramafic magmatism in the large magmatic provinces.

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Timing of Carbonatite Ultramafic Complexes of the Eastern Sayan Alkaline Province, Siberia: U–Pb (ID–TIMS) Geochronology of Ca–Fe Garnets

et al. 2023

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Neoproterozoic paleogeography and displacement of the Mongolian blocks constrained by detrital zircon ages and Hf isotopic systematics (Zavkhan Block, W Mongolia)

Soejono,

Collett,

Schulmann

et al. 2025

Precambrian Research

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The First Discovery of Archean Dolerite Dikes in the Western Part of the Aldan Shield

Erofeeva,

Larionova,

Samsonov

2024

Petrology

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Dolerite dikes were studied in the western part of the Aldan terrane, in the middle reaches of the Tokko River. These dolerite dikes form a swarm of submeridional trend about 1 km wide. The dolerites of the thickest dike preserve their primary textural and structural features and mineral composition: plagioclase + pigeonite + augite + titanomagnetite. Dolerite in the chilled margins and central parts of the dike are homogeneous in composition, corresponds to low-Mg tholeiites, has low contents of Ti and other HFSE, with weak enrichment in light REE and small negative Nb anomalies. Sm–Nd isotope data on magmatic minerals of dolerite from the central part of the dike yield a good linear regression in an isochron diagram that gives to an age of 2510 ± 64 Ma, which probably corresponds to the crystallization age of the basalt. Metadolerites in a thin dike retain plagioclase porphyritic structures, but the pyroxenes are completely replaced by amphibole and chlorite. The metadolerites are contrastingly different in low contents of MgO, Cr, and Ni and in higher contents of TiO2, Fe2O3, P2O5, Nb, and all REE. The differences in the composition of the dikes may be explained by the longterm (about 65%) crystallization differentiation of the initial melt and the emplacement of the residual melt from a shallow intermediate magma chamber via opening cracks. Such conditions probably may have existed in tectonically stable intraplate settings. The age of the dolerites of the dike swarm is comparable to that of the anorogenic granites of the Nelyuki complex (~2.4–2.5 Ga), which are widespread in the western part of Aldan granulite–gneiss terrane. Our data bridge some gaps in characteristics of intraplate anorogenic magmatism that occurred in the western Aldan Shield in the Late Archean and marked the final consolidation of a large block of Archean crust in the Chara–Olekma granite–greenstone area.

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Identification of the ca. 720 Ma Irkutsk LIP and its plume centre in southern Siberia: The initiation of Laurentia-Siberia separation

Cited by 6 publications

References 37 publications

Timing of Carbonatite Ultramafic Complexes of the Eastern Sayan Alkaline Province, Siberia: U–Pb (ID–TIMS) Geochronology of Ca–Fe Garnets

Timing of Carbonatite Ultramafic Complexes of the Eastern Sayan Alkaline Province, Siberia: U–Pb (ID–TIMS) Geochronology of Ca–Fe Garnets

Neoproterozoic paleogeography and displacement of the Mongolian blocks constrained by detrital zircon ages and Hf isotopic systematics (Zavkhan Block, W Mongolia)

The First Discovery of Archean Dolerite Dikes in the Western Part of the Aldan Shield

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