Soluble salt deposit in the Nihewan beds and its environmental significance

Autor:	Weili Qiu, Yongliang Li, Qiumin Zhai, Rongquan Li, Jianguo Qiao
Rok vydání:	2000
Předmět:	chemistry.chemical_classification Gypsum Geochemistry Salt (chemistry) Structural basin engineering.material chemistry.chemical_compound chemistry Stage (stratigraphy) Salt deposit engineering General Earth and Planetary Sciences Sedimentary rock Sulfate Chlorite Geomorphology Geology
Zdroj:	Science in China Series D: Earth Sciences. 43:464-479
ISSN:	1862-2801 1006-9313
DOI:	10.1007/bf02875308
Popis:	Observation and experimental analysis of soluble salt deposit along four profiles across the strata deposited in Nihewan paleolake basin enabled us to recognize the nature and evolution stages of the Nihewan paleolake and its significance in stratigraphical division and paleo-environmental reconstruction. The Nihewan paleolake was at least a weak-saline to semi-saline lake and represents an intracontinental lake in the semi-arid region. The lower member of sedimentary strata in the paleolake contains gypsum layer and gypsum lamellae. Soluble salt is mainly composed of SO 4 2- and Ca 2+ ions, representing a trend of the paleolake evolving into a stage of sulfate lake. The upper member of the strata has predominantly Cl - , K + , and Na + ions in soluble salt, indicating a starting development of the paleolake to chlorite lake, but no salt rock was deposited, indicating a drying trend of the area.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0710246387b22b30c9f814ce1e6999d1 https://doi.org/10.1007/bf02875308 Zobrazit plný text záznamu Full text from SpringerLink