Environmental Engineering Reference
In-Depth Information
Maymecha
Norilsk
3500
Maymechinsky
Samoedsky
3000
Meimechites
Kumginsky
Picrites
2500
Kharaelakhsky
Delkansky
Mokulaevsky
2000
Ayan River picrite
Morongovsky
Maslovskoe
Tyvankitsky
1500
Kotuy
Nadezhdinsky
Black
et al.
, 2012
1000
Tuklonsky
Onkuchaksky
Onkuchaksky
Khakanchansky
4270/13
Cy50
Gudchikhinsky
500
Syverminsky
Arydzhansky
Pravoboyarsky
Ivakinsky
0
Tungusskaya series
Figure 10.1 Stratigraphy of volcanic sections of Norilsk and Maymecha River
modi
ed after Kamo
et al
.(
2003
). Symbols indicate stratigraphic position of
samples: open symbols, uncontaminated by crust;
filled symbols, contaminated
by crust.
new data for melt inclusions in olivine from alkaline picrites from two localities:
Ayan River and the Delkansky suite of the Maymecha
-
Kotuy province. The Ayan
picrites are exposed in a single 100-m-thick flow in the Putorana plateau at a level
that stratigraphically corresponds to the upper part of the Morongovsky suite in the
middle of the main, tholeiitic,
c
alkaline lavas whose composition ranges from trachyte to meimechite. They are
probably younger than the main
-
Kotuy region is dominated by ma
c
-
ultrama
flood-basalt sequence (Fedorenko
et al
.,
1996
).
We also report data for melt inclusions in clinopyroxene phenocrysts from
the border of the Southern Maslovskoe intrusion, a tholeiitic ma
c
sill in the Norilsk region (Krivolutskaya
et al
.,
2012
). This sample provides volatile
contents (Cl, F, B, S, H
2
O) of tholeiitic basalts of the main volcanic sequence.
Inclusion-bearing minerals were separated and heated for 20 minutes at 1250
C
(olivine) and 1200
C (clinopyroxene) then quenched to produce glassy inclusions.
The samples were prepared in a vertical quenching furnace at controlled oxygen
fugacity corresponding to the quartz
c
-
ultrama
magnetite (QFM) buffer at the
Vernadsky Institute of Geochemistry, Moscow. Quenched grains were mounted
in epoxy and polished to expose glass inclusions on the surface.
Electron probe microanalyses were conducted on the Jeol Jxa 8200 Superprobe at
-
fayalite
-
