Late Quaternary Caspian Sea environment: Late Khazarian and Early Khvalynian transgressions from the lower reaches of the Volga River

Tudryn, Alina; Chalié, Françoise; Lavrushin, Yu A.; Антипов, М. П.; Спиридонова, Е. А.; Lavrushin, V. Yu.; Tucholka, P.; Leroy, Suzanne A.G.

doi:10.1016/j.quaint.2012.10.032

Cited by 58 publications

(25 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Micromorphology confirms that mono-clay layers also have a layered microstructure and could be subdivided into three sub-facies, including fine silty and coarse-silty micro-layers indicating variable sedimentation environments diagnostic for Chocolate clays [17,22,40]. Tudryn et al [20] point out that these sediments suggest a rather calm depositional environment and visually, may resemble varied sediments in periglacial lakes. They have a high content of non-silicate iron fractions that are responsible for their specific Chocolate color (Table 2)-the presence of iron oxides (hydro goethite and manganese) impregnating the entire clay series.…”

Section: Discussionmentioning

confidence: 90%

See 1 more Smart Citation

Landscape Dynamics in the Caspian Lowlands Since the Last Deglaciation Reconstructed From the Pedosedimentary Sequence of Srednaya Akhtuba, Southern Russia

et al. 2018

View full text Add to dashboard Cite

Surface Kastanozem of the Lower Volga area was first studied as a part of the pedocomplex, with the lower part (148–160 cm) formed in Early Khvalynian Chocolate clays (13–15 ka), the middle part (100–148 cm) in a mixed clay-loess sediment sand, and the upper part (0–100 cm) in loess. This resulted from local aeolian transport, with the source material derived from the rewinding of marine sediments. They are enriched in aggregates of Chocolate clays and glauconitic grains of a fine sand-course silt size and have similar contents of clay minerals. The high salinity of similar types evidences marine genesis for both Chocolate clays and source material for loess sediments. Clay fragments of a sand and silt size are responsible for the heavy texture and high gypsum content of loess. The study of soils with the focus on micromorphology and clay mineralogy allows the identification of the complex character of a shift from marine to sub-areal sedimentation. This shift was accompanied by short breaks in sedimentation, allowing the development of synlithogenic soil horizons of Late Khvalynian, after-Khvanynian, and Boreal time. The features of shallowly buried soil horizons confirm increased aridity after the last deglaciation. Surface Calcic Kastanozem is a full Holocene soil reflecting the present environment. However, it is deeply influenced by shallow buried soil horizons and Chocolate clays.

show abstract

Section: Discussionmentioning

confidence: 90%

“…The Srednaya Akhtuba section is a unique exposure representing the most complete sequence of Late Pleistocene continental and marine deposits interbedded with seven pedogenetic levels from MIS 5 to MIS 1 (Figure 2, [1,4,15,[17][18][19][20][21]).…”

Section: Study Areamentioning

confidence: 99%

Landscape Dynamics in the Caspian Lowlands Since the Last Deglaciation Reconstructed From the Pedosedimentary Sequence of Srednaya Akhtuba, Southern Russia

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Many more different types of refugia have been proposed, as for instance 'palaeorefugia and neorefugia' (Nekola, 1999), 'macro-and microrefugia' (Rull, 2009), and 'nunatak, peripheral and lowland refugia' for mountain species (Holderegger, Thiel-Egenter, 2009). We refer to Tzedakis et al (2013) who critically commented on these terms. To avoid terminological debate and to be in line with the terminology used in older literature, we will only use the terms 'glacial' and 'interglacial' refugia in its broadest sense referring "to an area, of any size, in which a taxon persisted, at any population density, during a cold [or warm] stage" (Bennett et al, 1991).…”

Section: General Aspectsmentioning

confidence: 99%

The Eurasian steppe belt: Status quo, origin and evolutionary history

2019

Turczaninowia

View full text Add to dashboard Cite

We present a comprehensive review of the characteristics and structure of the Eurasian steppe and of its evolutionary history in space and time. During the last decades, tremendous advances in research methods in earth and palaeontological sciences have greatly increased knowledge on palaeoclimates and palaeoenvironments of the Cenozoic era. We discuss well-known facts against the background of the recent progress made in these fields and others related to our topics, and address open questions. In Part I (Status quo), we deal with steppe classification systems, human impact and present state of the Eurasian steppe. Here, we concentrate on prehistoric times when the first human cultures emerged, and on the last 100 to 200 years when drastic changes occurred and in many regions steppe nearly completely disappeared. In Part II (Origin and evolutionary history of the Eurasian steppe) we attend to the origin and evolution of grasses and grassland in general, and to the evolution and climate/landscape history of the Eurasian steppe belt in particular. Uplift of the Himalayan-Tibet Plateau, changes in land-sea distribution and global climate trends have been invoked as driving forces behind Cenozoic paleoclimate changes, but there is little consensus which one is the most important driver. We finally identify gaps/challenges in our knowledge about the evolutionary history of the Eurasian steppe and discuss research directions, which might help to unravel the florogenetic and steppe habitat dynamics from the beginning of steppe formation to the present time.

show abstract

“…Throughout the Quaternary, the Caspian Sea level underwent several changes. Numerous studies relating to this question reconstruct sea level oscillations, and include sea level variation curves (Kroonenberg et al, 1997;Mamedov, 1997;Rychagov, 1997;Mikhailov et al, 2003;Hoogendoorn et al, 2005;Tudryn et al, 2013;Leroy et al, 2013aLeroy et al, , 2013bLeroy et al, , 2013cLeroy et al, , 2014Naderi Beni et al, 2013aOllivier et al, 2015). About six main regression/transgression periods since 30 ka are generally recognized.…”

Section: Introductionmentioning

confidence: 99%

Base level changes, river avulsions and Holocene human settlement dynamics in the Caspian Sea area (middle Kura valley, South Caucasus)

Ollivier

Fontugne

Lyonnet

et al. 2016

Quaternary International

View full text Add to dashboard Cite

Late Quaternary Caspian Sea environment: Late Khazarian and Early Khvalynian transgressions from the lower reaches of the Volga River

Cited by 58 publications

References 45 publications

Landscape Dynamics in the Caspian Lowlands Since the Last Deglaciation Reconstructed From the Pedosedimentary Sequence of Srednaya Akhtuba, Southern Russia

Landscape Dynamics in the Caspian Lowlands Since the Last Deglaciation Reconstructed From the Pedosedimentary Sequence of Srednaya Akhtuba, Southern Russia

The Eurasian steppe belt: Status quo, origin and evolutionary history

Base level changes, river avulsions and Holocene human settlement dynamics in the Caspian Sea area (middle Kura valley, South Caucasus)

Contact Info

Product

Resources

About