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Titolo:
Diagenesis of the Purington Shale in the Illinois Basin and implications for the diagenetic state of sedimentary rocks of shallow Paleozoic basins
Autore:
Moore, DM;
Indirizzi:
Illinois State Geol Survey, Champaign, IL 61820 USA Illinois State Geol Survey Champaign IL USA 61820 Champaign, IL 61820 USA
Titolo Testata:
JOURNAL OF GEOLOGY
fascicolo: 5, volume: 108, anno: 2000,
pagine: 553 - 567
SICI:
0022-1376(200009)108:5<553:DOTPSI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY-DIFFRACTION; TEXAS GULF-COAST; FRIO FORMATION; SOUTH TEXAS; ILLITE TRANSFORMATION; ARGILLACEOUS SEDIMENT; DETRITAL FELDSPARS; CLAY-MINERALS; SMECTITE; BURIAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Moore, DM Illinois State Geol Survey, 615 E Peabody Dr, Champaign, IL 61820 USA Illinois State Geol Survey 615 E Peabody Dr Champaign IL USA 61820
Citazione:
D.M. Moore, "Diagenesis of the Purington Shale in the Illinois Basin and implications for the diagenetic state of sedimentary rocks of shallow Paleozoic basins", J GEOLOGY, 108(5), 2000, pp. 553-567

Abstract

The clay minerals, micas, and feldspars of the Pennsylvanian-age PuringtonShale have been more diagenetically active than generally recognized. Theyhave undergone diagenetic changes comparable to those of Cenozoic and Mesozoic sedimentary rocks buried three to four times as deeply and heated to approximately twice the temperature. The Purington Shale on the Western Shelf of the Illinois Basin has experienced maximum burial of less than or equal to 1.0 km and was never heated to more than 60 degrees C, except for a very brief time at about 80 degrees C. The illite/smectite (I/S) of the Purington Shale has greater than or equal to 90% illite. The chemical compositions of the feldspar assemblage in the 0.09-0.063-mm fraction differ from most modern detrital suites of feldspars but are similar to diagenetic sequences described by others from much greater burial depths and are extensively,but not completely, albitized. The simplest interpretation of the apparently advanced stage of diagenesis is that the diagenetic processes have been operating at less pressure and lower temperature but for a longer time; an example of low-temperature, time-dependent diagenesis. By similar reasoning, the apparently anomalously advanced maturity of all of the sedimentary rocks in the relatively shallow Illinois Basin is explained. This generalization should be considered for all shallow Paleozoic basins and should influence (1) exploration for petroleum, (2) use of modal and chemical analyses for determining provenance, and (3) use of chemical composition of shales asproxy for crustal evolution.

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Documento generato il 04/12/20 alle ore 15:24:31