Abstract
Backscattered electron microscopy, in conjunction with energy dispersive X-ray analysis, was used to record diagenetic changes associated with foraminiferal remains from wells along the Texas Gulf Coast. Foraminiferal tests are found at all depths in these wells, which penetrate the relatively underformed Miocene Anahuac and Oligocene Frio Formations to depths of over six kilometers. Mineralogical changes are shown to be greatest when they occurred in direct association with foraminiferal remains. During progressive recrystallization, the intergranular and intragranular carbonate cements nucleated first on foraminiferal tests, then increased in size, formed complex zoned rhombs, and eventually fossil ghosts. Other changes associated with foraminiferal remains include the formation of large, individual hopper-shaped pyrite crystals and pyrite framboids, test fillings of chlorite and interlayered illite/chlorite, and lowered porosity.
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