Stages of Trap Magmatism in the Norilsk Area: New Data on the Structure and Geochemistry of the Volcanic Rocks

Krivolutskaya, Nadezhda; Kuzmin, D. V.; Gongalsky, Bronislav; Roshchina, I. A.; Kononkova, N. N.; Svirskaya, Natalia; Romashova, T. V.

doi:10.1134/s0016702918050026

Cited by 10 publications

(15 citation statements)

References 21 publications

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“…The difference between the Upper Nadezhdinsky and Lower Morongovsky formations was previously demonstrated [77,78]. Thus, trap magmatism per se (the platform stage) began from the eruption of the Tuklonsky basalt, not from the Upper Morongovsky rocks, as was suggested earlier [59].…”

Section: Volcanic Rocksmentioning

confidence: 53%

“…Thus, based on the Gd/Yb ratio and location within the province [53], the "transitional" rocks were produced by a magmatic process typical of the rift (the Nadezhdinsky formation) and platform (the Tuklonsky formation) regime, rather than by any intermediate process. The difference between the Upper Nadezhdinsky and Lower Morongovsky formations was previously demonstrated [77,78]. Thus, trap magmatism per se (the platform stage) began from the eruption of the Tuklonsky basalt, not from the Upper Morongovsky rocks, as was suggested earlier [59].…”

Section: Volcanic Rocksmentioning

confidence: 53%

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Unique PGE–Cu–Ni Noril’sk Deposits, Siberian Trap Province: Magmatic and Tectonic Factors in Their Origin

et al. 2019

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The unique and very large PGE–Cu–Ni Noril’sk deposits are located within the Siberian trap province, posing a number of questions about the relationship between the ore-forming process and the magmatism that produced the traps. A successful answer to these questions could greatly increase the possibility of discovering new deposits in flood basalt provinces elsewhere. In this contribution, we present new data on volcanic stratigraphy and geochemistry of the magmatic rocks in the key regions of the Siberian trap province (Noril’sk, Taimyr, Maymecha-Kotuy, Kulyumber, Lower Tunguska and Angara) and analyze the structure of the north part of the province. The magmatic rocks of the Arctic zone are characterized by variable MgO (3.6–37.2 wt %) and TiO2 (0.8–3.9 wt %) contents, Gd/Yb (1.4–6.3) and La/Sm (2.0–10.4) ratios, and a large range of isotopic compositions. The intrusions in the center of the Tunguska syneclise and Angara syncline have much less variable compositions and correspond to a “typical trap” with MgO of 5.6–7.2 wt %, TiO2 of 1.0–1.6 wt %, Gd/Yb ratio of 1.4–1.6 and La/Sm ratio of 2.0–3.5. This compositional diversity of magmas in the Arctic zone is consistent with their emplacement within the paleo-rift zones. Ore-bearing intrusions (the Noril’sk 1, Talnakh, Kharaelakh) are deep-situated in the Igarka-Noril’sk rift zone, which has three branches, namely the Bolsheavamsky, Dyupkunsky, and Lower Tunguska, that are prospected for discovering new deposits. One possible explanation for the specific position of the PGE–Cu–Ni deposits is accumulation of sulfides in these long-lived zones from the Neoproterozoic to the Mesozoic era during magmatic and metamorphic processes. Thus, trap magmatism, itself, does not produce large deposits, but mobilizes earlier formed sulfide segregations in addition carrying metals in the original magmas. These deposits are the results of several successive magmatic events, in which emplacement of the traps was the final event.

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Section: Volcanic Rocksmentioning

confidence: 53%

Section: Volcanic Rocksmentioning

confidence: 53%

Unique PGE–Cu–Ni Noril’sk Deposits, Siberian Trap Province: Magmatic and Tectonic Factors in Their Origin

et al. 2019

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“…Many similar examples have been described for most CFBs: CAMP (e.g., Marzoli et al, 2019, and references therein;Tegner et al, 2019) , Karoo-Ferrar CFB (Elliot et al, 1995;Fleming, 1995;Fleming et al, 1992;Luttinen & Furnes, 2000;J. S. Marsh et al, 1997), Siberian Traps (Fedorenko et al, 1996;Krivolutskaya & Sobolev, 2016;Krivolutskaya et al, 2018aKrivolutskaya et al, , 2018bLightfoot, Naldrett, et al, 1990;Reichow et al, 2005), North Atlantic Igneous Province (NAIP, Andreasen et al, 2004;L. M. Larsen & Pedersen, 2009;Millett et al, 2016Millett et al, , 2017Peate et al, 2008), Parana-Etendeka (Machado et al, 2018;Peate & Hawkesworth, 1996), Ethiopian Traps (Kieffer et al, 2004;S.…”

Section: Observations From Other Cfbsmentioning

confidence: 86%

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

2021

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“…It interacted with mid‐crustal rocks in what we presume to have been a broadly distributed series of dikes, sills and mush reservoirs, within which processes of “recharge, crystallization, mixing and assimilation” occurred (e.g., Cashman et al., 2017; Hildreth & Moorbath, 1988). Based on clinopyroxene compositions in Middle and Upper series basalts (Krivolutskaya et al., 2018; Ryabov et al., 2014) and seismic data (Krivolutskaya, 2016; Sluzhenikin et al., 2014), we estimate that this staging reservoir extended from ∼5 to 15 km depth at pressures of 1.25–4 kbar with internal temperatures of 1,130–1,200°C (Putirka, 2008), roughly corresponding to the boundary between supracrustal strata and basement (Figure S1).…”

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 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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Stages of Trap Magmatism in the Norilsk Area: New Data on the Structure and Geochemistry of the Volcanic Rocks

Cited by 10 publications

References 21 publications

Unique PGE–Cu–Ni Noril’sk Deposits, Siberian Trap Province: Magmatic and Tectonic Factors in Their Origin

Unique PGE–Cu–Ni Noril’sk Deposits, Siberian Trap Province: Magmatic and Tectonic Factors in Their Origin

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

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

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