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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 58 (1988)No. 6. (November), Pages 992-1002

Loss of Provenance Information Through Subsurface Diagenesis in Plio-Pleistocene Sandstones, Northern Gulf of Mexico

Kitty Lou Milliken

ABSTRACT

Subsurface alteration of plagioclase, potassium feldspar, and a variety of nonopaque heavy minerals has substantially modified the detrital composition of Plio-Pleistocene sediments in the northern Gulf of Mexico. Albitization of plagioclase and dissolution of unstable grains are the two principal mechanisms of grain alteration. Grain alteration increases progressively with depth and has taken place without the influence of significant amounts of meteoric fluids. The degree to which strictly subsurface grain alteration has affected these young sediments suggests that grain assemblages in older rocks should be viewed most skeptically with regard to their state of preservation.


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