Petrographic Characteristics of Transgressive and Regressive Limestone of Upper-Pennsylvanian (Virgilian) Oread Cyclothem, NE Oklahoma and SE Kansas
Department
Geosciences and Geological and Petroleum Engineering
Major
Geological Sciences and Engineering
Research Advisor
Yang, Wan
Advisor's Department
Geosciences and Geological and Petroleum Engineering
Funding Source
Missouri S&T Opportunities for Undergraduate Research Experiences (OURE) Program
Abstract
Limestone composition and texture indicate environmental conditions during landward (transgressive) and seaward (regressive) shoreline migrations. We studied six thick regressive Plattsmouth Limestone samples and five thin transgressive Leavenworth Limestone samples at two localities ~50 km apart. Microscopically, Leavenworth samples are dominantly biomicrites with crinoid and fusulinid fragments and coated grains, 1.3 mm in size, poorly-moderately sorted, and variably skewed. Plattsmouth samples are dominantly biomicrites with phylloidal algal and brachiopod fragments and coated grains, 3.6 mm in size, poorly to very poorly sorted, and variably skewed. Leavenworth samples become coarser and more poorly-sorted upward. Plattsmouth samples become finer and better sorted upward at inner shelf, but coarsen upward at algal mound. Plattsmouth is coarser and more poorly-sorted and has less fusulinid but more algae than Leavenworth. The differences conform with a giving-up mode of deposition during Leavenworth sea-level rise and a keeping-up mode during Plattsmouth slow sea-level fall.
Biography
Bin is a senior majoring in Geology. He is an international student from China. He received a scholarship from WAAIME in 2011.
Research Category
Sciences
Presentation Type
Poster Presentation
Document Type
Poster
Location
Upper Atrium/Hallway
Presentation Date
10 Apr 2012, 9:00 am - 11:45 am
Petrographic Characteristics of Transgressive and Regressive Limestone of Upper-Pennsylvanian (Virgilian) Oread Cyclothem, NE Oklahoma and SE Kansas
Upper Atrium/Hallway
Limestone composition and texture indicate environmental conditions during landward (transgressive) and seaward (regressive) shoreline migrations. We studied six thick regressive Plattsmouth Limestone samples and five thin transgressive Leavenworth Limestone samples at two localities ~50 km apart. Microscopically, Leavenworth samples are dominantly biomicrites with crinoid and fusulinid fragments and coated grains, 1.3 mm in size, poorly-moderately sorted, and variably skewed. Plattsmouth samples are dominantly biomicrites with phylloidal algal and brachiopod fragments and coated grains, 3.6 mm in size, poorly to very poorly sorted, and variably skewed. Leavenworth samples become coarser and more poorly-sorted upward. Plattsmouth samples become finer and better sorted upward at inner shelf, but coarsen upward at algal mound. Plattsmouth is coarser and more poorly-sorted and has less fusulinid but more algae than Leavenworth. The differences conform with a giving-up mode of deposition during Leavenworth sea-level rise and a keeping-up mode during Plattsmouth slow sea-level fall.
Comments
Joint project with Lu Zhu