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Titolo:
FRIO SHALE MINERALOGY AND THE STOICHIOMETRY OF THE SMECTITE-TO-ILLITEREACTION - THE MOST IMPORTANT REACTION IN CLASTIC SEDIMENTARY DIAGENESIS
Autore:
LYNCH FL;
Indirizzi:
UNIV TEXAS,DEPT GEOL SCI AUSTIN TX 78712
Titolo Testata:
Clays and clay minerals
fascicolo: 5, volume: 45, anno: 1997,
pagine: 618 - 631
SICI:
0009-8604(1997)45:5<618:FSMATS>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTH TEXAS; BURIAL DIAGENESIS; PELITIC SEDIMENTS; CLAY-MINERALS; GULF; DEHYDRATION; SANDSTONES; BASIN; MONTMORILLONITE; TRANSFORMATION;
Keywords:
DIAGENESIS; ILLITE-SMECTITE; MASS BALANCE; MINERALOGY; SHALE;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
70
Recensione:
Indirizzi per estratti:
Citazione:
F.L. Lynch, "FRIO SHALE MINERALOGY AND THE STOICHIOMETRY OF THE SMECTITE-TO-ILLITEREACTION - THE MOST IMPORTANT REACTION IN CLASTIC SEDIMENTARY DIAGENESIS", Clays and clay minerals, 45(5), 1997, pp. 618-631

Abstract

Burial diagenesis of shales of the Frio Formation resulted in an increase in the abundance of mixed-layer illite-smectite (IS), albite and chlorite, and a decrease in the abundance of K-feldspar, illite and kaolinite. Some of the mineralogic trends determined in this study contrast with the results of Hower et al. (1976) and other studies of Frio shales. The differences are due to improvements in laboratory and clayquantification techniques since the time of the earlier research. I-Scomposition changed from similar to 20% to greater than or equal to 80% illite, and mineralogic and chemical reaction of IS continued throughout burial. Shale diagenesis was an open-system process that required addition of K2O and Al2O3, and resulted in loss of SiO2. The amount of SiO2 made available by shale diagenesis is sufficient to be the source of the quartz-overgrowth cements in the associated Frio sandstones. The relationships between IS diagenesis and fluid flow from shales into sandstones, generation of abnormal formation-water fluid pressure,onset of sandstone diagenesis and distribution of authigenic phases in sandstones indicate that reaction of the I-S in shales is one of themost important components of the sandstone/shale/formation water diagenetic system.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 16:56:24