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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract



Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes
Vol. 66 (1996)No. 3. (May), Pages 439-446

Diagenesis of Calcite Cement in Frio Formation Sandstones and its Relationship to Formation Water Chemistry

F. Leo Lynch, Lynton S. Land

ABSTRACT

Calcite cement is one of the most volumetrically important diagenetic minerals formed during burial of Frio Formation sandstones from the Corpus Christi area of Texas. Syndepositional calcite is restricted to shore-zone sandstones, whereas later, post-quartz-overgrowth, burial-diagenetic calcite is present in both shore-zone and shelf sandstones.

The d18O of burial-diagenetic calcite becomes depleted with depth. Chemical and textural evidence favors partial dissolution and reprecipitation (recrystallization) with consequent isotopic resetting as being responsible for the change in calcite d18O with progressive burial. The change in calcite 87Sr/86Sr with depth also supports progressive recrystallization of calcite.

There is a strong relationship between the 87Sr86Sr and trace element composition of calcite and formation water from individual growth-fault blocks. Significant differences in strontium isotopic and trace element composition exist between adjacent fault blocks, implying that each fault block has behaved as a chemically separate system since the time of calcite precipitation.


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