Results of dating of thorianite and baddeleyite from carbonatites of the Guli massif, Russia

Malitch, K. N.; Хиллер, В. В.; Badanina, I. Yu.; Белоусова, Е. А.

doi:10.1134/s1028334x15100050

Cited by 18 publications

(15 citation statements)

References 8 publications

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“…However, this cannot reflect the true age of Guli carbonatite. It is too old relative to the date of thorianite (250.1 ± 2.9 Ma; Malich et al, 2015) and to the host volcanic rocks (Fig. 1c).…”

Section: Table S-3) Other Common Mineral Inclusions Are Apatites (Figs 3 S-2)mentioning

confidence: 92%

“…A later determination of the age of the Arydzhansky and Delkansky Formations with high precision U-Pb ID-TIMS geochronology by Burgess and Bowring (2015), gave slightly older perovskite dates of 252.20 ± 0.12 Ma and 252.27 ± 0.11 Ma for the Arydzhansky Formation, and slightly older zircon dates of 251.901 ± 0.061 Ma and 251.483 ± 0.088 Ma for the Delkansky Formation (here errors are 2σ internal analytical for the reason explained below). Subsequent geochronology of the Guli carbonatites by Malich et al (2015), using chemical microprobe dating of thorianite and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) dating of baddeleyite, obtained dates consistent with Kamo et al (2003). The methods of Malich et al (2015) were, however, unable to yield precisions better than ±1 Ma, at best, which is comparable with the expected total duration of the voluminous phases of LIP magmatism.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequent geochronology of the Guli carbonatites by Malich et al (2015), using chemical microprobe dating of thorianite and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) dating of baddeleyite, obtained dates consistent with Kamo et al (2003). The methods of Malich et al (2015) were, however, unable to yield precisions better than ±1 Ma, at best, which is comparable with the expected total duration of the voluminous phases of LIP magmatism.…”

Section: Introductionmentioning

confidence: 99%

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207Pb-excess in carbonatitic baddeleyite as the result of Pa scavenging from the melt

Ivanov¹,

Corfú²,

Kamenetsky³

et al. 2021

Geochem. Persp. Let.

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For the last two decades, the end of the voluminous phase of eruptions of the Siberian Traps large igneous province has been constrained by a U-Pb date of discordant baddeleyite collected from the Guli carbonatite intrusion with the assumption that the discordance resulted from unsupported 207 Pb. In this study we have re-analysed baddeleyite from the same intrusion and found two types of discordance: (1) due to 207 Pb-excess, and (2) radiogenic lead loss from high U mineral inclusions. The former implies that baddeleyite is an efficient scavenger of protactinium during crystallisation, leaving the magma depleted in this element. Together with a published high precision U-Pb date of 252.24 ± 0.08 Ma for the Arydzhansky Formation, our new date of 250.33 ± 0.38 Ma for the Guli carbonatite constrains the total duration of the voluminous eruptions of the Siberian Traps LIP at 1.91 ± 0.38 million years. The lower intercept of the ( 231 Pa)/( 235 U) corrected discordance line yields a date of 129.2 ± 65.0 Ma, which points to the widespread Early Cretaceous rifting in East and Central Asia.

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Section: Table S-3) Other Common Mineral Inclusions Are Apatites (Figs 3 S-2)mentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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207Pb-excess in carbonatitic baddeleyite as the result of Pa scavenging from the melt

Ivanov¹,

Corfú²,

Kamenetsky³

et al. 2021

Geochem. Persp. Let.

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“…Важно отметить, однако, что, согласно работам [Renne et al, 2010;Ivanov et al, 2013], Ar/Ar датировки систематически моложе U-Pb определений изотопного возраста на 0.9 % из-за неточности принятых констант распада 40 К. U-Pb изохронный возраст пород Гулинского плутона составляет 250±8.7 млн лет [Kogarko, Zartman, 2011]. Результаты датирования карбонатитов последней фазы внедрения U-Pb методом по бадделеиту составляют 250.8±1.2 млн лет [Malich et al, 2015] и 250.2±0.3 млн лет [Kamo et al, 2003], Th-U-Pb методом по торианиту -250.1±2.9 млн лет [Malich et al, 2015]. Таким образом, имеющиеся U-Pb геохронологические данные свидетельствуют о том, что формирование Гулинского плутона происходило синхронно (в пределах ошибок определения возраста) с излияниями платобазальтов с образованием карбонатитов на заключительной стадии магматизма.…”

Section: объект и методы исследованийunclassified

Thermal history of the Guli pluton (north of the Siberian platform) according to apatite fission-track dating and computer modeling

Myshenkova

Zaitsev

Thomson

et al. 2020

Geodin. tektonofiz.

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We present the first results of fission-track dating of apatite monofractions from two rock samples taken from the Southern carbonatite massif of the world’s largest alkaline ultrabasic Guli pluton (~250 Ma), located within the Maymecha-Kotuy region of the Siberain Traps. Based on the apatite fission-track data and computer modeling, we propose two alternative model of the Guli pluton's tectonothermal history. The models suggest (1) rapid post-magmatic cooling of the studied rocks in hypabyssal conditions at depth about 1.5 km, or (2) their burial under a 2-3 km thick volcano-sedimentary cover and reheating above 110°C, followed by uplift and exhumation ca. 218 Ma.

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“…Акцессорный бадделеит (ZrO 2 ) широко распространен в различных по составу магматических породах, недонасыщенных кремнеземом: базитах и ультрабазитах земного происхождения, лунных образцах, метеоритах, кимберлитах, карбонатитах, щелочных сиенитах, лампрофирах, в которых является преобладающим циркониевым минералом [Heaman, LeCheminant, 1993, и ссылки в данной работе; Mackie et al, 2009;Meng, Zhang, 2009;Jiang, Hsu, 2012;Rajesh et al, 2006;Wall et al, 2018;Bao et al, 2020;и др.]. В породах основного состава кристаллы бадделеита обычно формируются на последних стадиях кристаллизации магмы из обогащенных несовместимыми элементами наиболее фракционированных порций расплава.…”

Section: Introductionunclassified

Zr-Th-U MINERALS IN HIGH-MG DIORITE OF THE CHELYABINSK MASSIF (SOUTH URALS) – EVIDENCE FOR CRUST–MANTLE INTERACTION

Osipova

Каллистов

Замятин

et al. 2021

Geodin. tektonofiz.

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Zr-Th-U minerals, namely baddeleyite, zircon and U-Th-oxide, were found in high-Mg diorite from the Late Devonian – Early Carboniferous synplutonic dyke in granodiorites of the Chelyabinsk massif, South Urals. Micron-sized minerals were investigated by electron microscopy and cathodoluminescence spectroscopy. Their chemical compositions were determined by electron probe microanalysis that was optimized to ensure more precise measurements of the composition of minerals. Baddeleyite grains are found as inclusions in amphibole crystals and reside in intergranular areas. The former retain their composition and show no traces of corrosion or substitution. In the intergranular areas, baddeleyite grains were replaced by polycrystalline zircon due to the reaction with an acid melt, and the U-Th-oxide precipitated inside baddeleyite simultaneously, which suggests the restite origin of baddeleyite. The main features of the baddeleyite composition are extremely high concentrations of ThO2 and UO2 (to 0.03 wt. % and 1.0 wt. %, respectively), which may be due to the metasomatic interaction between the mantle peridotite and the crustal or carbonatite fluid or melt.

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Results of dating of thorianite and baddeleyite from carbonatites of the Guli massif, Russia

Cited by 18 publications

References 8 publications

207Pb-excess in carbonatitic baddeleyite as the result of Pa scavenging from the melt

207Pb-excess in carbonatitic baddeleyite as the result of Pa scavenging from the melt

Thermal history of the Guli pluton (north of the Siberian platform) according to apatite fission-track dating and computer modeling

Zr-Th-U MINERALS IN HIGH-MG DIORITE OF THE CHELYABINSK MASSIF (SOUTH URALS) – EVIDENCE FOR CRUST–MANTLE INTERACTION

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