Geomagnetic Secular Variations at the Permian‐Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps

Павлов, В. Е.; Fluteau, Frédéric; Латышев, А. В.; Fetisova, A. M.; Elkins‐Tanton, L. T.; Black, B. A.; Burgess, Seth D.; Veselovskiy, R. V.

doi:10.1029/2018gc007950

Cited by 33 publications

(39 citation statements)

References 60 publications

(123 reference statements)

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“…Among the differentiated mafic‐ultramafic bodies, only three specific intrusions (Norilsk‐1, Talnakh, and Kharaelakh) contain economic mineralization, featuring a combination of exceptionally thick ore bodies within relatively thin subhorizontal and internally zoned doleritic units (Figures 2a and 2b), and these are classified as Norilsk‐type (Sluzhenikin et al., 2014; Zen’ko & Czamanske, 1994). These ore‐bearing intrusions have been correlated on the basis of geochemistry, U‐Pb geochronology, and paleomagnetic records with a marked change in magma source and eruptive style along with greatly increased rate of magma production marking the transition from the Middle series which terminates above the uppermost Nd , in a transitional series that includes the lowermost Morongovsky ( Mr ) lavas, to the much more voluminous Upper series which comprise the remainder of the Mr and the Mokulaevsky ( Mk )‐Samoedsky ( Sm ) lava series (Latyshev et al., 2020; Pavlov et al., 2019).…”

Section: Overviewmentioning

confidence: 99%

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Linking the Siberian Flood Basalts and Giant Ni‐Cu‐PGE Sulfide Deposits at Norilsk

Yao

Mungall

2021

JGR Solid Earth

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The world‐class magmatic sulfide deposits in the Norilsk region exhibit a remarkable spatial and temporal association with the Siberian large igneous province (LIP). However, the details of the causal connection between the Siberian LIP and the ore deposits have remained contentious. Here we address the problem by modeling of assimilation, crystallization and flow behavior of magmas based on aggregated data from the Norilsk camp. Crustal assimilation at depth by mantle‐derived picritic magma can account for the compositional and isotopic variations of the early tholeiitic basalts and the sequestering of sulfide liquid in a mid‐crustal conduit system. When the rate and volume of asthenospheric magma production dramatically increased, the metal tenors of the mid‐crustal sulfide reservoir were first upgraded by consequent reaction with the fresh, undepleted magmas, then entrained and flushed to higher crustal levels. The resulting sulfide‐rich emulsions were too dense to reach the surface to form lavas but were instead emplaced in multiple pulses within blind sill‐like bodies at shallow depth. Sulfide ores transported from the mid‐crust were deposited at the bases of the upper‐crustal sills, where sedimentary host rocks were assimilated wholesale by the already sulfide‐charged replenishing magmas; this shallow assimilation was itself not instrumental in forming the ores. Although the evolution and dynamics of flood basalts are thus inextricably linked with coeval subvolcanic economic intrusions, the mineralization itself is argued not to occupy feeders with direct links to the overlying lavas, suggesting major implications for exploration in other LIPs.

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Section: Overviewmentioning

confidence: 99%

“…The stratiform structures of Norilsk‐type intrusions (Figure 2c) were likely formed by sequential injection of distinct but closely related magmas into the same space (Czamanske et al., 1995), possibly at times separated by up to several hundred thousand years (Pavlov et al., 2019).…”

Section: Models Of Magmatismmentioning

confidence: 99%

Linking the Siberian Flood Basalts and Giant Ni‐Cu‐PGE Sulfide Deposits at Norilsk

Yao

Mungall

2021

JGR Solid Earth

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“…The best example from the geologic record is the emplacement of large igneous provinces (LIPs) 4 , which are synchronous with several major Phanerozoic mass extinctions, indicating LIPs as potential triggers of global-scale climatic and environmental changes via the release of volatiles 2 . LIPs, often volumetrically dominated by continental flood basalts, are exceptional intraplate magmatic events involving huge magma volumes (up to 10 6 km 3 ) 5 , that are emplaced episodically, leading to a pulsed release of their volatile phases 6,7 . This potentially results in rapid rise of atmospheric CO 2 and global climate warming [8][9][10] .…”

mentioning

confidence: 99%

“…CAMP magmatism coincided in time with three marked negative carbon isotope excursions bracketing the main extinction period 20,24,25 , and with an inferred strong rise of atmospheric CO 2 8,9 . In general, the pulsed magmatic and degassing activities of LIPs 6,7 can cause a rapid rise of atmospheric CO 2 and greenhouse conditions, which are reflected by rapid δ 13 C negative excursions recorded in both organic matter and carbonates 10 , testifying to a global perturbation of the exogenic (i.e., superficial) carbon cycle. A rapid input of 13 C-depleted volatile phases into the atmosphere-hydrosphere system is possibly triggered by the emission of volcanic CO 2 24 , and likely enhanced by the emission of CO 2 and CH 4 derived from the thermal metamorphism of intruded organic matter-rich sediments 26 .…”

mentioning

confidence: 99%

Deep CO2 in the end-Triassic Central Atlantic Magmatic Province

et al. 2020

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Large Igneous Province eruptions coincide with many major Phanerozoic mass extinctions, suggesting a cause-effect relationship where volcanic degassing triggers global climatic changes. In order to fully understand this relationship, it is necessary to constrain the quantity and type of degassed magmatic volatiles, and to determine the depth of their source and the timing of eruption. Here we present direct evidence of abundant CO 2 in basaltic rocks from the end-Triassic Central Atlantic Magmatic Province (CAMP), through investigation of gas exsolution bubbles preserved by melt inclusions. Our results indicate abundance of CO 2 and a mantle and/or lower-middle crustal origin for at least part of the degassed carbon. The presence of deep carbon is a key control on the emplacement mode of CAMP magmas, favouring rapid eruption pulses (a few centuries each). Our estimates suggest that the amount of CO 2 that each CAMP magmatic pulse injected into the end-Triassic atmosphere is comparable to the amount of anthropogenic emissions projected for the 21 st century. Such large volumes of volcanic CO 2 likely contributed to end-Triassic global warming and ocean acidification.

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“…Изменение виртуальных геомагнитных полюсов, рассчитанных для высокотемпературной компоненты, по разрезу интрузий. № -номер образца в разрезе интрузии от подошвы к кровле; β -угловая разница между вир туальным геомагнитным полюсом данного образца и палеомагнитным полюсом NMK, рассчитанным по траппам Сибирской платформы [Pavlov et al, 2019]; N -прямая полярность; R -обратная полярность.…”

Section: палеомагнетизмunclassified

Signs of the record of geomagnetic reversal in permian–triassic trap intrusions of the Ergalakhsky complex, Norilsk region

2019

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Alternating intervals of normal and reversed polarity are revealed in the sections of two Permian–Triassic trap intrusions of the Ergalakhsky complex, Norilsk region. The near-contact zones of the intrusions are magnetized reversely, whereas magnetization in the central zones has normal polarity. The arguments are presented that this change in the polarity along the intrusions section is not due to the postmagmatic remagnetization or self-reversal of remanence but marks the reversal of the geomagnetic field that occurred during the emplacement of the intrusive bodies. Highly accurate age determination for the Ergalakhsky intrusions – the oldest intrusive trap complex in the Norilsk region – is vital for time correlation of the initial stage of magmatic activity. According to the paleomagnetic data, the studied sills intruded directly at the Permian–Triassic boundary at the very end of the Ivakinsky stage. The existing estimates for the durations of the reversals indicate that the cooling of the intrusions could last a few thousand years. In the future, the examined sills of the Ergalakhsky complex can be used as a unique object for exploring the structure of the geomagnetic field during the reversals, for reconstructing the thermal history of intrusions’ cooling, and as a reference for estimating the total duration of trap magmatism.

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Geomagnetic Secular Variations at the Permian‐Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps

Cited by 33 publications

References 60 publications

Linking the Siberian Flood Basalts and Giant Ni‐Cu‐PGE Sulfide Deposits at Norilsk

Linking the Siberian Flood Basalts and Giant Ni‐Cu‐PGE Sulfide Deposits at Norilsk

Deep CO2 in the end-Triassic Central Atlantic Magmatic Province

Signs of the record of geomagnetic reversal in permian–triassic trap intrusions of the Ergalakhsky complex, Norilsk region

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