Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps?

Reichow, Marc K.; Saunders, Andrew D.; Scott, Robert A.; Millar, Ian L.; Barfod, Dan N.; Pringle, Malcolm S.; Rogers, N. W.; Hammond, Samantha J.

doi:10.1016/j.lithos.2016.01.018

Cited by 17 publications

(32 citation statements)

References 79 publications

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“…This confirms previous suggestions e.g. 10,11,27,28,31 that the main pulse of subvolcanic and volcanic activity of the Siberian LIP covered a significantly larger area than could be documented with existing data, but also show that it includes significant volumes of more chemically evolved magmas. The presence of alkaline intermediate to felsic rocks intruded during the main pulse of the Siberian LIP also calls into question the interpreted ages of the syenitic plutons dated by Vernikovsky et al .…”

Section: Discussionsupporting

confidence: 91%

“…The white and black bars ( c ) represent weighted average zircon U-Pb ages (2σ errors) from sills and effusives, respectively, from the Tunguska Basin and Meymecha- Kotuy presented in Burgess and Bowring 21 . Cross hatched bar represent the range of ages previously obtained from basalts, dolerites and layered intrusives from Taimyr with a 2σ error bar 10,11,34,35 . Stage boundary (Changshingian-Induan; ( a )) is from Burgess et al .…”

Section: Discussionmentioning

confidence: 99%

“…Synchronicity between the well-studied and well-dated main outcrop sequence of the Siberian Traps in the Tunguska basin 2,3,14,17,21 and those in the surrounding areas was suggested by several workers 1,8,23–31 and demonstrated at the ~5 m.y. level 10,11 , reflecting the uncertainty and accuracy in the geochronological data. However, this potential spread in ages is well outside the recently proposed time frame for the main pulse of Siberian Traps volcanic and subvolcanic activity at ca.…”

Section: Introductionmentioning

confidence: 99%

“…One of the areas included in the greater region attributed to the Siberian LIP lies within the Taimyr Fold Belt on the Taimyr Peninsula (Fig. 1) and contains basaltic flows that have been stratigraphically, geochemically, and geochronologically (Ar-Ar), correlated to lava flows in the central part of the LIP 10,11,27,28,31 . It also contains numerous alkaline (ultra)mafic to felsic intrusive complexes in the form of layered intrusives, plutons, sills and dykes.…”

Section: Introductionmentioning

confidence: 99%

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The main pulse of the Siberian Traps expanded in size and composition

Augland

Ryabov

Vernikovsky

et al. 2019

Sci Rep

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Emplacement of large volumes of (sub)volcanic rocks during the main pulse of the Siberian Traps occurred within <1 m.y., coinciding with the end-Permian mass extinction. Volcanics from outside the main Siberian Traps, e.g. Taimyr and West Siberia, have since long been correlated, but existing geochronological data cannot resolve at a precision better than ~5 m.y. whether (sub)volcanic activity in these areas actually occurred during the main pulse or later. We report the first high precision U-Pb zircon geochronology from two alkaline ultramafic-felsic layered intrusive complexes from Taimyr, showing synchronicity between these and the main Siberian Traps (sub)volcanic pulse, and the presence of a second Dinerian-Smithian pulse. This is the first documentation of felsic intrusive magmatism occurring during the main pulse, testifying to the Siberian Trap’s compositional diversity. Furthermore, the intrusions cut basal basalts of the Taimyr lava stratigraphy hence providing a minimum age of these basalts of 251.64 ± 0.11 Ma. Synchronicity of (sub)volcanic activity between Taimyr and the Siberian Traps imply that the total area of the Siberian Traps main pulse should include a ~300 000 km2 area north of Norilsk. The vast aerial extent of the (sub)volcanic activity during the Siberian Traps main pulse may explain the severe environmental consequences.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The main pulse of the Siberian Traps expanded in size and composition

Augland

Ryabov

Vernikovsky

et al. 2019

Sci Rep

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“…While all overlying formations in the Noril'sk region have normal magnetic polarity [79,80] (excluding the uppermost Samoedsky formation, for which reliable paleomagnetic data are scarce), the Verkhnetamsky formation of Taimyr reveals a reversed interval [82]. Moreover, there is an opinion that a Middle-Late Triassic magmatic pulse occurred in the Southern Taimyr based on paleomagnetic and 40 Ar/ 39 Ar study of mafic sills and extrusive rocks [83,84]. To resolve the problem, a detailed magnetostratigraphic and geochemical investigation of the Taimyr lava sections is required.…”

Section: Volcanic Rocksmentioning

confidence: 99%

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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Radiometric Constraints on the Timing, Tempo, and Effects of Large Igneous Province Emplacement

Kasbohm

Schoene

Burgess

2021

Large Igneous Provinces

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There is an apparent temporal correlation between large igneous province (LIP) emplacement and global environmental crises, including mass extinctions. Advances in the precision and accuracy of geochronology in the past decade have significantly improved estimates of the timing and duration of LIP emplacement, mass extinction events, and global climate perturbations, and in general have supported a temporal link between them. In this chapter, we review available geochronology of LIPs and of global extinction or climate events. We begin with an overview of the methodological advances permitting improved precision and accuracy in LIP geochronology. We then review the characteristics and geochronology of 12 LIP/event couplets from the past 700 Ma of Earth history, comparing the relative timing of magmatism and global change, and assessing the chronologic support for LIPs playing a causal role in Earth's climatic and biotic crises. We find that (1) improved geochronology in the last decade has shown that nearly all well-dated LIPs erupted in < 1 Ma, irrespective of tectonic setting; (2) for well-dated LIPs with correspondingly well-dated mass extinctions, the LIPs began several hundred ka prior to a relatively short duration extinction event; and (3) for LIPs with a convincing temporal connection to mass extinctions, there seems to be no single characteristic that makes a LIP deadly. Despite much progress, higher precision geochronology of both eruptive and intrusive LIP events and better chronologies from extinction and climate proxy records will be required to further understand how these catastrophic volcanic events have changed the course of our planet's surface evolution.

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Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps?

Cited by 17 publications

References 79 publications

The main pulse of the Siberian Traps expanded in size and composition

The main pulse of the Siberian Traps expanded in size and composition

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

Radiometric Constraints on the Timing, Tempo, and Effects of Large Igneous Province Emplacement

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