Formation conditions of the postcollisional granites of the Kara orogen (North Taimyr, Central Arctic): application of 3D numeric modeling

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Resumo

Using 3D numerical modeling, we analyze the formation of postcollisional granitoids of the Kara orogen in Northern Taimyr under conditions of elevated heat flow due to the orogen’s breakup prior to its mantle plume episode (280–250 Ma). The initial geometry of the model area, the boundary conditions and physical properties for the crust and the mantle have been selected to reflect the structure of the crust in the junction zone of the Kara, Central Taimyr, and Siberian blocks. Comparing 2D and 3D modeling results with identical parameters and medium physical properties defined by the Rayleigh number shows that 3D modeling yields a more realistic and correct description of relevant magmatic processes. At the base of the modeled Earth crust at ~50 km an area of melting of continental crust appears, possibly with slight input of mantle component, which generates magma uplift and the formation of closely spaced granitoid intrusions. Plutons with diameters 10–20 km were emplaced at depths 14–8 km during 15 million years, which is close to the actual geological position of postcollisional stocks of the Kara orogen.

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Sobre autores

V. Vernikovsky

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: MatushkinNY@ipgg.sbras.ru

Academician of the RAS

Rússia, Novosibirsk; Novosibirsk

A. Semenov

V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: MatushkinNY@ipgg.sbras.ru
Rússia, Novosibirsk; Novosibirsk

O. Polyansky

V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: MatushkinNY@ipgg.sbras.ru
Rússia, Novosibirsk

A. Babichev

V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: MatushkinNY@ipgg.sbras.ru
Rússia, Novosibirsk; Novosibirsk

A. Vernikovskaya

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: MatushkinNY@ipgg.sbras.ru
Rússia, Novosibirsk; Novosibirsk

N. Matushkin

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Autor responsável pela correspondência
Email: MatushkinNY@ipgg.sbras.ru
Rússia, Novosibirsk; Novosibirsk

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2. Fig. 1. Geological and tectonic scheme of the north-eastern part of the Kara orogen according to [2] with modifications. 1–2 – Southern domain (South Taimyr folded belt) – deformed passive margin of the Siberian paleocontinent): 1 – mainly dolomites and limestones of the North Byrranga zone (O–C2); 2 – mainly sandstones, argillites and coal-bearing deposits of the South Byrranga zone (C3–P2); 3–5 – formations of the Siberian traps (P3–T1): 3 – basalts and tuffs; 4 – dolerite sills; 5 – alkaline and subalkaline syenites, granites and monzonites (249–233 Ma); 6–10 – Central domain (Central Taimyr accretionary belt): 6 – Mammoth-Shrenkov (I) and Faddeevsky (II) granite-metamorphic terranes (PP–MP); 7 – Neoproterozoic granitoids (940–850 Ma); 8 – island-arc complexes (NP1–3); 9 – ophiolites, including plagiogranites (750–730 Ma); 10 – carbonate terranes; 11 – deformed cover of the Siberian paleocontinent (NP3–C1); 12 – Northern domain (North Taimyr (Kara) block) – passive margin of the Kara microcontinent (NP3–Є); 13 – syncollisional granites (315–305 and 287–282 Ma); 14 – post-collisional granites (264–248 Ma) (red dotted line – supposed contours of intrusions); 15 – tectonic sutures – thrusts (G – Main Taimyr, F – Pyasino-Faddeevsky); 16 – P – Boundary thrust; 17 – overlying deposits (J–Q). U‒Pb age values ​​for zircons are taken from [1, 2, 5, 6]

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3. Fig. 2. Results of 3D modeling. The area corresponds to the rectangle in Fig. 1, where the left far edge of the model refers to the Kara block, the right near edge – to the Central Taimyr block, the lower surface – to the base of the earth's crust. The isothermal surface of the solidus is shown at 30 (a) and 36 (b) million years from the onset of the increased heat flow, the maximum rise is indicated by marks. The color scale is given in the range of 240–730 °C to detail the structure of the massifs.

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4. Fig. 3. Horizontal sections of the model (Fig. 2) at a depth of 10 and 15 km for time points of 21, 24, 27, 30, 33.5 and 36 million years, which corresponds to the geological time of 260–245 million years ago. Red areas with a temperature of >730 °C show the shape and position in plan of the massifs at this time.

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5. Fig. 4. Comparison of the results of modeling in two-dimensional (left) and three-dimensional (right) formulations is given for similar geometry of the model area. The vertical section in the 3D version of the model is given in the middle of the model area, where portions of partial melt rise to different depth levels. The area of ​​partial melting (upper row) and temperature (lower row) are shown.

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