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BIO- AND MAGNETOSTRATIGRAPHIC DATA ON THE JURASSIC-CRETACEOUS BOUNDARY OF THE KASHPIR AND GORODISHCHI SECTIONS (VOLGA REGION, RUSSIA)

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BIO- AND MAGNETOSTRATIGRAPHIC
DATA ON THE JURASSIC-CRETACEOUS
BOUNDARY OF THE KASHPIR AND
GORODISHCHI SECTIONS (VOLGA
REGION, RUSSIA)
Baraboshkin E.Yu.1, Guzhikov A.Yu.2, Manikin
A.G.2, Pimenov M.V.2
1Lomonosov
Moscow State University, Moscow
2Chernyshevsky Saratov State University, Saratov
Kashpir-Marievka
Localities
Gorodischi
K1h2
K1v
K1rz
J3v3
J3v3
J3v2-v-n
J3v2-pd
J3v2
ZRDTZR
C
R-Zr
DRZ
Samples
Thickness
Zone
Substage
UP
Stage
System
Minerals distribution:
Gorodischi
Anatase
N
I
Garnet - Gr
Disthene - Dis
Staurolite
Epidote
Tr-Rut-Zr
L
M
I D
D
I
G
L
O
V
Dorsoplanites panderi
A
E
S
S
A
R
Tourmaline - Tr
Rutile - Rut
J
U
Zircon - Zr
Sphene
Amphibole
Pyroxene
Ilmenite
Black shale
Carbonate rocks
Sandstone
Siltstone
Mudstone
Sampl
Zone
SSt
Syst
CRETACEOUS
RYAZANIAN
J U R A S S I C
U P P E R V O L G I A N
Grainsize
Heavy
minerals
Minerals distribution:
Kashpir
Sandstone with phosphorites
Mudstone
Sandstone
M VOLG
Grainsize, mm
J3v3
Rut-Zr+Dis
Rut-Zr
Paleogeography &
Sourseland
Rut-Zr
Tur-Rut-Zr
K1rz
Dis-Rut-Gr
Rut-Zr+Dis
Rut-Zr
Rut-Zr
Tur-Rut-Zr
Surface currents
Tethyan
Boreal
Sediment input
Biostratigraphy
STAGE
SUBSTAGE
ZONE, SUBZONE
Polyptychites polyptychus
Valanginian
Lower
Polyptychites michalskii
Nikitinoceras syzranicum
Pseudogarnieria undulatoplicatilis
Peregrinoceras albidum
Surites tzikwinianus
Ryazanian
Transcaspiites transfigurabilis
Riasanites
rjasanensis
Hectoroceras kochi
Riasanites subrjasanensis
Craspedites milkovensis
Craspedites
nodiger
Volgian
Upper
Craspedites mosquensis
Craspedites subditus
Kachpurites fulgens
Craspedites nekrassovi
Kachpurites fulgens
Kashpir: Upper Volgian
Craspedites
mosquensis Geras.
Craspedites
milkovensis
(Strem.)
Garniericeras
catenulatum (Fisch.)
Craspedites
subditus (Trd.)
Craspedites
nekrassovi Prig.
Kachpurites
fulgens (Trd.)
Craspedites
okensis
(d’Orb.)
Epivirgatites
nikitini (Mich.)
Kashpir: Ryazanian-Valanginian
Nikitinoceras
syzranicum
Nikitinoceras
glaber
Peregrinoceras cf.
Surites tzikwinianus
albidum Casey
(Bogosl.)
Riasanites cf.
rjasanensis (Nik.)
Paleomagnetic
sampling
•23 samples studied from the
interval of ~2.5 m in
Gorodische section
• 30 samples from the interval
of ~7 m in Kashpir section
Location, stratigraphy and
paleomagnetic sampling in
Gorodischi and Kashpir
sections
The results of magnetic cleanings (Kashpir)
The results of magnetic cleanings (Kashpir)
Magnetostratigraphic
correlation of Middle
Volgian – Ryazanian in
Kashpir & Gorodischi
Lower
Valanginian
Magnetostratigraphic
correlation of the
J/K boundary
interval
Boreal succession: Dzyuba et
al., 2013; Guzhikov, 2013;
Houša et al., 2007
Tethyan succession: Dzyuba et
al., 2013; Gradstein et al., 2012;
Guzhikov, 2013
Volgian composite: this study
Conclusions
• Biostratigraphy needs additional discussion
• Heavy minerals distribution confirm
paleogeographic changes
• It is possible to use paleomagnetic
information in the condensed sections
• Additional sampling is needed
• The most confident magnetostratigraphic
correlation: the base of R. rjasanensis Zone is
not younger than M17r Chron and is likely to
be close to the base of the Boreal Sibiricus
Zone and Tethyan Occitanica Zone
Thank you!
The study has been supported by RFBR grants № 14-05-31152, 1305-00745а, 12-05-00196а, 14-05-31152-мол_а and the RF Ministry of
Education and Sciences in the scientific field (project 1757)
Автор
Nastya
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