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The Salina evaporites in the Michigan Basin

Peter Sonnenfeld and Ihsan S. Al-Aasm
The Salina evaporites in the Michigan Basin (in Early sedimentary evolution of the Michigan Basin, Paul A. Catacosinos (editor) and Paul A. Daniels (editor))
Special Paper - Geological Society of America (1991) 256: 139-153


Evaporitic conditions in the Michigan Basin commenced in Late Ordovician time and continued into the Early Devonian. Five major evaporite (anhydrite/halite) cycles in the Silurian Salina Group (termed "A-1," "A-2," "B," "D," and "F") can be recognized. They are further subdivided into two or more cycles of evaporite deposition by intercalations of less soluble members. Only the lowermost Salina evaporite produced a sylvinite deposit. The water surface was enlarged in subsequent evaporite cycles, which did not go beyond halite saturation, suggesting an enlargement of the water supply. Additional seawater came from the Kokomo Sea in Indiana; continental waters likely also entered at times from the Moose River Basin. The Chatham sag eventually fed Michigan Basin brines into Ohio and Pennsylvania. A progressive overstepping of one evaporite unit over the one below indicates either subsidence affecting a wider area of rising sea level, the latter suggested by the inundation of northern Ohio beginning with the "B" unit of salt deposition. In no case does brine depth appear to have exceeded some tens of meters. The present morphology of reefs is dictated as much by compaction of surrounding micrites as by renewed growth on older reef mounds where rates of subsidence remained moderate. The amount of clay influx in the upper part of the Salina suggests that humid periods became more frequent at the expense of the duration of dryer periods. Post-Salina rocks initially contain numerous short-lived evaporite cycles, and then grade to open-marine sediments, deposited before the Michigan Basin became emergent land in the late Paleozoic

ISSN: 0072-1077
EISSN: 2331-219X
Serial Title: Special Paper - Geological Society of America
Serial Volume: 256
Title: The Salina evaporites in the Michigan Basin
Title: Early sedimentary evolution of the Michigan Basin
Author(s): Sonnenfeld, PeterAl-Aasm, Ihsan S.
Author(s): Catacosinos, Paul A.editor
Author(s): Daniels, Paul A., Jr.editor
Affiliation: Univ. Windsor, Dep. Geol., Windsor, ON, Canada
Affiliation: Delta Coll., Dep. Geol., University Center, MI, United States
Pages: 139-153
Published: 1991
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2256-X
Meeting name: AAPG, Eastern Section 15th annual meeting
Meeting location: Ann Arbor, MI, USA, United States
Meeting date: 19861986
References: 100
Accession Number: 1991-038334
Categories: Sedimentary petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: sects., chart, sketch maps
N41°45'00" - N48°25'00", W90°15'00" - W82°30'00"
Secondary Affiliation: Petro-Hunt Corp., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1991
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