Diagenetic history of the Stanton Limestone (Missourian, Upper Pennsylvanian) in northern midcontinent
- Univ. of Iowa, Iowa City, IA (United States). Dept. of Geology
The Stanton Limestone in the northern midcontinent represents a complete cyclothem deposited during eustatic sea level change. The transgressive and regressive limestone members of the Stanton Limestone experienced initially different but later similar diagenetic patterns. Three phases of diagenesis are recognized. Early phase in the transgressive limestone took place during shallow burial probably up through maximum transgression. It is characterized by aragonite botryoids in skeletal cavities and in sheltered pore space beneath algal blades. Pervasive pyrite cement near the upper part resulted from sulfate reduction under the anoxic environment established at maximum transgression. Early diagenesis of the regressive limestone, however, is characterized by a great abundance of isopachous rims of fibrous to bladed calcite and inclusion-rich syntaxial overgrowths. The second phase of diagenesis involved meteoric water, which caused leaching of unstable grains and subsequent collapse and micro-brecciation in both limestones. Cements precipitated during early diagenesis were geochemically overprinted during meteoric diagenesis, giving rise to bright luminescence (higher Mn[sup 2+] ) under CL for all the early marine cements. The late diagenetic phase occurred during deeper burial when higher cyclothems were at their early to second phases of diagenesis. Much iron (Fe[sup 2+]) was incorporated into carbonate cements dominated by ankerite and Fe-dolomite, because of the reducing nature of deep burial environments. In some cases, silica void-filling and replacement of earlier cements represent the latest generation of cements.
- OSTI ID:
- 7281398
- Report Number(s):
- CONF-9303210--
- Journal Information:
- Geological Society of America, Abstracts with Programs; (United States), Journal Name: Geological Society of America, Abstracts with Programs; (United States) Vol. 25:3; ISSN GAAPBC; ISSN 0016-7592
- Country of Publication:
- United States
- Language:
- English
Similar Records
Contrasting styles of chemical compaction in the Upper Pennsylvanian Dennis Limestone in the Midcontinent region, U. S. A
Diagenetic history of Cotton Valley limestone at Teague Townsite field, Freestone County, Texas