Geo-Marine Letters

, Volume 4, Issue 2, pp 69–76 | Cite as

Basalt from Louisiana continental shelf

  • Richard Rezak
  • Thomas T. Tieh


A basalt outcrop was discovered on Alderdice Bank on the outer Louisiana continental shelf. The basalt shows an age of 76.8 ± 3.3 × 106 years. Textural, mineralogical, and chemical characteristics indicate that it is an alkali basalt of shallow intrusive origin. It was probably brought to the seafloor by salt tectonics and exposed due to salt dissolution.

An accurate account of the Mesozoic geologic history of the Gulf of Mexico must consider the apparent consanguinity of all magmatic rocks of the region, including the Alderdice Bank basalt, and the apparent basinward decrease in age of magmatic activities.


Chemical Characteristic Continental Shelf Geologic History Magmatic Rock Magmatic Activity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag New York Inc 1984

Authors and Affiliations

  • Richard Rezak
    • 1
  • Thomas T. Tieh
    • 2
  1. 1.Department of OceanographyTexas A&M UniversityCollege Station
  2. 2.Department of GeologyTexas A&M UniversityCollege Station

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