Matches in SemOpenAlex for { <https://semopenalex.org/work/W2125402012> ?p ?o ?g. }
Showing items 1 to 47 of
47
with 100 items per page.
- W2125402012 abstract "ABSTRACT About 10 meters of probable Oligocene or Miocene lacustrine sediments which crop out on top of Sentinel Butte in western North Dakota consist mostly of greenish-gray zeolitic mudstone interbedded with relatively thin layers of dolomite, limestone, and chalcedony. The dolomite layers are several centimeters thick and are mostly dolomicrite, with laminae or lenses of arkosic sand and pellets. They probably formed by deposition of protodolomite in shallow, closed, saline lakes. The limestone layers are up to 30 centimeters thick. Their basal portions contain varve couplets of micrite and organic matter. Graded bedding in micrite laminae and concentration of aeolian silt in organic laminae suggest that deposition of carbonate took place during a relatively brief portion of each year. Pres rvation of varves, fossil fish, and coprolites in the limestone imply deposition in a meromictic lake. In contrast, poor preservation of fish and bioturbation in the upper parts of two limestone beds record transition to holomictic conditions. Some variations in varve thickness appear rhythmic and possibly related to the sunspot cycle. Several asymmetric cycles of contrasting carbonate facies, ideally consisting of massive dolomite overlying clay and underlying laminated limestone, imply that the ancient lake in which the sequence was deposited underwent several episodes of shrinkage and closure during which its salinity increased, followed by expansion accompanied by abrupt development of ectogenic meromixis. Changes in authigenic mineralogy and upward increase in thickness of limestone beds relative to dolomite beds record a long-term trend toward freshening of basinal hydrology. Models involving ectogenic meromixis can explain intimate associations of evaporitic facies with varved sediments in other sedimentary sequences and may be applicable to some Precambrian iron formations." @default.
- W2125402012 created "2016-06-24" @default.
- W2125402012 creator A5063496108 @default.
- W2125402012 date "1981-01-01" @default.
- W2125402012 modified "2023-09-27" @default.
- W2125402012 title "Tertiary Lacustrine Sediments from Sentinel Butte, North Dakota and the Sedimentary Record of Ectogenic Meromixis" @default.
- W2125402012 doi "https://doi.org/10.1306/212f7c98-2b24-11d7-8648000102c1865d" @default.
- W2125402012 hasPublicationYear "1981" @default.
- W2125402012 type Work @default.
- W2125402012 sameAs 2125402012 @default.
- W2125402012 citedByCount "4" @default.
- W2125402012 countsByYear W21254020122012 @default.
- W2125402012 countsByYear W21254020122023 @default.
- W2125402012 crossrefType "journal-article" @default.
- W2125402012 hasAuthorship W2125402012A5063496108 @default.
- W2125402012 hasConcept C127313418 @default.
- W2125402012 hasConcept C151730666 @default.
- W2125402012 hasConcept C166957645 @default.
- W2125402012 hasConcept C167391731 @default.
- W2125402012 hasConcept C17409809 @default.
- W2125402012 hasConcept C205649164 @default.
- W2125402012 hasConcept C6494504 @default.
- W2125402012 hasConceptScore W2125402012C127313418 @default.
- W2125402012 hasConceptScore W2125402012C151730666 @default.
- W2125402012 hasConceptScore W2125402012C166957645 @default.
- W2125402012 hasConceptScore W2125402012C167391731 @default.
- W2125402012 hasConceptScore W2125402012C17409809 @default.
- W2125402012 hasConceptScore W2125402012C205649164 @default.
- W2125402012 hasConceptScore W2125402012C6494504 @default.
- W2125402012 hasLocation W21254020121 @default.
- W2125402012 hasOpenAccess W2125402012 @default.
- W2125402012 hasPrimaryLocation W21254020121 @default.
- W2125402012 hasRelatedWork W2069497390 @default.
- W2125402012 hasRelatedWork W2100067434 @default.
- W2125402012 hasRelatedWork W2159666545 @default.
- W2125402012 hasRelatedWork W2349677304 @default.
- W2125402012 hasRelatedWork W2765679345 @default.
- W2125402012 hasRelatedWork W2993808206 @default.
- W2125402012 hasRelatedWork W801022094 @default.
- W2125402012 hasRelatedWork W806980984 @default.
- W2125402012 hasRelatedWork W826816199 @default.
- W2125402012 hasRelatedWork W837008050 @default.
- W2125402012 hasVolume "Vol. 51" @default.
- W2125402012 isParatext "false" @default.
- W2125402012 isRetracted "false" @default.
- W2125402012 magId "2125402012" @default.
- W2125402012 workType "article" @default.