Volcanic pulses in the Siberian Traps as inferred from Permo-Triassic geomagnetic secular variations - Volcanism and Global Environmental Change - page 65

Maymecha

Norilsk

3500

Maymechinsky

Samoedsky

3000

Kumginsky

2500

Kharaelakhsky

Delkansky

Mokulaevsky

2000

Morongovsky

Tyvankitsky

1500

Kotuy

Nadezhdinsky

1000

Tuklonsky Onkuchaksky

Onkuchaksky

Khakanchansky

Gudchikhinsky

500

Syverminsky

Pravoboyarsky Arydzhangsky

Ivakinsky

0

Tungusskaya series

Figure 5.2 Stratigraphy of volcanic sequences of Norilsk, Kotuy and Maymecha
regions. Correlation scheme after (Kamo et al ., 2003 ).

melanephelinite, augitite and other alkaline-ultrama c lavas interlayered in the

lower part of the section with alkaline-ultrama c tuffs. The Truba section contains

42 basaltic flows of the Onkuchaksky Formation.

The Ergalakh section ( 200 m thick) is located 15 km south of Norilsk
( Figure 5.1c ). The lowermost part of the Norilsk lava section, including the Ivakinsky,
Syverminsky and Gudchikhinsky formations ( Figure 5.2 ), is exposed there. Samples
were collected from12 basaltic

flows and from the Norilsk-2 intrusion, which cuts the
volcanic sequence. The Sunduk section is located about 90 km to the east of Norilsk
( Figure 5.1c ) and contains the lower half of the Norilsk volcanic sequence from the
Ivakinsky to Nadezhdinsky formations, with a total thickness of about 750 m. The
section consists of 42 tholeitic and picritic lava ows and ma ctuffs.

The rocks composing the studied sections are virtually flat-lying except in the

flows are slightly tilted with dip to the northwest at 3 - 5 .
Sedimentary rocks of nearby outcropping Tungusskaya sedimentary series are

Truba section, where

flat-lying, so we propose that the dip of the Truba flows represents local paleo-

topography due to erosion.
Additionally, we have used Heunemann et al .( 2004 ) from four sections
(Listvjanka, Icon, Abagalakh - 180 m) located in the

Norilsk area ( Figure 5.1c ). The Listvjanka section contains the three lowermost
units from the Ivakinsky to Gudchikhinsky formations, the Icon section contains
three units from the Tuklonsky to Morongovsky formations, the Abagalakh section
contains four units from the Morongovsky to Kumginsky formations, and the

2200 m - and Talnakh -