See more from this Division: Topical Sessions
See more from this Session: The Gulf of Mexico as a Geologic Laboratory: Making New Links in Depositional Systems from the Coastal Plain to Deep Water
Abstract:
Yegua sandstones from the upper Texas coastal plain show similar partitioning of rock fragments preferentially into lowstand basin-floor fan deposits, whereas lowstand prograding-wedge deposits are more quartz rich. In contrast, composition of Miocene sandstones on the upper Texas and Louisiana shelf varies with geographic location and is controlled mainly by provenance. Miocene sandstones from the central Texas coast (Matagorda Bay) contain abundant volcanic rock fragments derived from volcanism in West Texas and Mexico. Miocene sandstones from offshore Louisiana are quartz rich, reflecting the greater distance from the volcanic source; Miocene sandstones from Galveston and High Island areas show intermediate composition.
In formations with minimal change in provenance, detrital mineral composition may vary subtly in different systems-tract settings. In formations with diverse provenance, however, mineralogical differences caused by depositional setting are likely to be overshadowed.
See more from this Division: Topical Sessions
See more from this Session: The Gulf of Mexico as a Geologic Laboratory: Making New Links in Depositional Systems from the Coastal Plain to Deep Water