ISSN 0145-8752, Moscow University Geology Bulletin, 2018, Vol. 73, No. 2, pp. 121–130. © Allerton Press, Inc., 2018.
Original Russian Text © L.I. Demina, V.S. Zakharov, M.Yu. Promyslova, S.P. Zav’yalov, 2018, published in Vestnik Moskovskogo Universiteta, Seriya 4: Geologiya, 2018, No. 1,
The Relationship between the Taimyr Collision and Trap Magmatism
Based on Geological Data and Modeling Results
L. I. Demina
*, V. S. Zakharov
, M. Yu. Promyslova
, and S. P. Zav’yalov
Department of Geology, Moscow State University, Moscow, 119991 Russia
Received October 26, 2017
Abstract⎯Collision and trap magmatism are spatially conjugated within the Taimyr fold region. Trap mag-
matism is related in time to late collision and postcollision stages. Supercomputer modeling makes it to pos-
sible to reveal the potential for mantle and crust heating at the late collision stages, accompanied by large-
scale basaltic magmatism.
Keywords: collision, magmatism, traps, supercomputer modeling, and Taimyr
The Taimyr fold area of the northern framing of the
Siberian Platform is one of the largest structures in the
Arctic Region. It consists of three zones: the North-
ern, Central, and Southern Taimyr zones. These zones
are separated by large overthrusts, that is, as the Major
Taimyr and Pyasina–Faddeevsky overthrusts. The
Northern Taimyr zone is composed of rhythmically alter-
nating metasanstone, meta-aleurolite, and metapelite, as
well as amphibolite and amphibole–biotite crystal
schist (Bezzubtsev et al., 1986; Zabiyaka, 1974).
Within Central Taimyr zone there are allocated Pre-
riphean Mamonta–Shrenk and Faddeevka craton
blocks (terranes) (Proskurin et al., 2014), as well as
metamorphosed igneous, volcanosedimentary, and
carbonate rocks of predominantly Riphean age, over-
lapped by the Vendian–Early Carboniferous cover.
The Southern Taimyr zone is a trough composed of
Ordovician–Triassic sedimentary, carbonate, and vol-
canosedimentary rocks with ages from Ordovician to
Triassic (Vernikovskii, 1996).
The ideas on the geodynamic evolution of the
Taimyr fold region are extremely contradictory. Some
researchers relate its formation with the tectonic acti-
vation of the northern part of the Siberian Platform in
the Carboniferous–Permian (Bezzubtsev et al., 1986;
Pogrebitskii, 1971). A.I. Zabiyaka et al. (1986) identi-
fied Precambrian baikalides and karelides: Minino–
Valterovo miogeosyncline framed by the Kara Plat-
form and the Chukchi–Chelyuskin eugeosyncline of
the Siberian Platform, respectively. According to
V.A. Vernikovskii (1996), development of the Taimyr
fold region began in the Late Riphean from accretion
and collision of the island arc and continental blocks
with the Early Proterozoic crust. Collision of the
accretionary block and the Siberian Continent in the
Vendian was followed by development of the region as
a passive margin until the Late Carboniferous–Early
Permian, which was characterized by the collision of
the Kara and Siberian continents and the closing of
the Taimyr branch of the Paleo-Asiatic Ocean. This
collision stage (306–258 Ma ago) was fixed by calc-
alkali granitic magmatism and zonal metamorphism.
In the range from 264 to 247 Ma years ago, postcolli-
sional granitoid magmatism of the latite series was
replaced by intensive trap magmatism at the Permian
and Triassic boundary (249–242 Ma ago).
Such a spatial and temporal relationship between
collisional and trap magmatism is not accidental. The
nature of this relationship is one of the main problems
of the geodynamic evolution in the Taimyr fold region.
The currently prevailing point of view on the super-
plume nature of the trap magmatism in the studied
region does not take its relationship to the collision
process into account, which, in our opinion, is obvi-
ous. It is hard to imagine that the hot mantle uplifting
needed for the basalt magmatism formation is com-
pletely independent and is in no way related to the col-
lision process that involves a considerable volume of
the lithosphere and the sublithospheric mantle.
It is reasonable to apply supercomputer modeling
to understand the processes that accompany the colli-
sion and to explain the relationship between colli-
sional and trap magmatism. Formation of the basalt
(trap) magmatism in the intercontinental conditions
without a plume during the continental collision pro-
cess was described, for example, in (Lustrino, 2005).
However, such constructions are schematic and are
not supported by a computer model.