loess-palaeosol successions, southern and central russian plain: generally drier, cooler...

Loess-Palaeosol Successions, Loess-Palaeosol Successions, southern and central Russian Plain: southern and central Russian Plain: Generally drier, cooler InterglacialsGenerally drier, cooler Interglacials

N. Catto, A. VelichkoN. Catto, A. VelichkoDept of Geography, Memorial University of Newfoundland, Dept of Geography, Memorial University of Newfoundland,

St. John’s, Canada St. John’s, Canada ncatto@mun.ca ncatto@mun.ca Institute of Palaeogeography, Russian Academy of Sciences, Moscow, Institute of Palaeogeography, Russian Academy of Sciences, Moscow,

Russian FederationRussian Federation

Covered

Figure 2B Figure 2A

Exposure 1

Exposure 2

Exposure 3

Exposure 4

Exposure 5

Exposure 6

Exposure 7

Modern Soil

Mezin Palaeosol Complex, PC 1

Kamenka Palaeosol Complex, PC 2

Inzhavino Palaeosol Complex, PC 3

Vorona Palaeosol Complex, PC 4

Semybalki Exposure, Sea of Azov coastline

Mezin, MIS 5.5

Kamenka, MIS 7

Inzhavino, MIS 9

Vorona, MIS 11

Vorona palaeosol complex

- calcareous concretions; overprinting

- cutans & Fe-oxides

- crotovinas

Inzhavino palaeosol complex

- post-depositional vertical fracturing

Mikulino (Mezin) Kamenka

Inzhavino (Likhvin) Vorona (Muchkap)

Fig. 12. Progressive shift of types of soil-forming processes with time.

Soil types

Soil Complex Chernozem (w. frost features)

Chernozem (leached)

Eluviated & Gleyed

Chernozem-Luvisol

Elvuiated Kastenozem

Semiarid Subtropical

soil

Contemporary (Holocene)

PC1 Mikulino Interglacial

PC2 Kamenka Interglacial

PC3 Likhvin Interglacial

PC4 Muchkap Interglacial

Progressive shift of soil-forming processes with time, Semybalki and Port-Katon

Korostylievo

Mikhailovka Composite

SemybalkiComposite

Port Katon

0 m

10 m

5e

7

9

11

1

3

Cromerian

2-4

6

8

10

12+

Palaeosol

Loess

Fluvial Sand

Don Glacial DiamictonCromerian Marine Sand

Cromerian Marine SiltPaleogeneInterglacials & interstadials italicized

Northward TransitionsNorthward Transitions Vorona (Muchkap)Vorona (Muchkap) - - semi-humid subtropical Mediterranean & kastenozems in Azov region - transitional to chernozems, & to luvisolic soils in central Don River Basin

Inzhavino (Likhvin)Inzhavino (Likhvin) - - strongly preserved chernozemic characteristics in Azov exposures

- northward through drier, cooler prairie chernozems to luvisols

Kamenka (MIS 7)Kamenka (MIS 7) - - luvisols, dark grey chernozems, and gleysols in Azov exposures - Northward transition to soils indicative of cooler, drier conditions

Northward Transitions:

Mikukino

Port-Katon

Mikhailovka

Korostylievo

Gololobova

Progressive increasing influence of frost action follows both temporal and northward trends

SummarySummary

Progressive shift towards cooler, drier Progressive shift towards cooler, drier conditions in Azov exposures over timeconditions in Azov exposures over time

Similar northward shift in exposures along Similar northward shift in exposures along transecttransect

Increasing dominance of westerly over Increasing dominance of westerly over southerly air flow patternssoutherly air flow patterns

Compatible with MIS 5.5-1 successions in Compatible with MIS 5.5-1 successions in Siberian exposuresSiberian exposures