Paleogeographical History of the Aral Sea

Autor:	A.A. Svitoch
Rok vydání:	2009
Předmět:	Tectonic subsidence Paleontology biology Denudation Stage (stratigraphy) Sedimentary rock Transgressive Structural basin biology.organism_classification Cerastoderma glaucum Geology Holocene
Zdroj:	The Handbook of Environmental Chemistry ISBN: 9783540882763
DOI:	10.1007/698_2009_7
Popis:	The Aral Sea basin formed as a result of joint action of tectonic subsidence and processes of arid denudation. The basin itself features rather irregular bottom topography, with depressions divided by an elongated elevation trending from north to south. Fragments of marine terraces occur locally at 54–72 m a.s.l. on the sea coasts. In the marine series infilling the basin there have been distinguished sediments attributable to the Akchagylian and Apsheronian transgressions of the Caspian Sea and those of the Khorezmian suite (Holocene) deposited during the last marine stage of the Aral Sea. The lower portion of the sequence is represented by diversified lacustrine formations containing occasional interlayers of gypsum and shells of brackish-water and freshwater mollusks. The upper part of the sedimentary sequence consists of alternating layers corresponding to transgressive and regressive phases of the Aral Sea; shells of Cerastoderma glaucum (Cardium edule) are typically present.
Databáze:	OpenAIRE
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