Department
Geosciences and Geological and Petroleum Engineering
Major
Geology
Research Advisor
Hogan, John P.
Advisor's Department
Geosciences and Geological and Petroleum Engineering
Abstract
Ovoid K-feldspar mantled by Na-feldspar is called rapakivi. Rapakivi may form either by (1) decompression during ascent of felsic magma through the crust to a shallow magma chamber or by (2) mixing of mafic- and felsic-magma within a magma chamber. We suggest feldspars compositions may be used to distinguish between these two models. Rapakivi formed during decompression should have similar compositions. Conversely, if rapakivi have variable compositions this suggests variable interaction with compositionally unique magma at different times during crystallization. Cores and mantles of rapakivi feldspars from the Deer Isle Pluton, Maine will be drilled out and analyzed using Inductively Coupled Plasma - Mass Spectrometry and Optical Emission Spectrometry to determine subtle differences (ppm) in trace and Rare Earth Element abundances. These data will be used to resolve between the two models of formation.
Biography
Jason is a senior attending the University of Missouri-Rolla majoring in Geology. He is the son of Alan and Darcy Kaiser and is from St. Louis, Missouri. He is actively involved in the CL Dake society (American Association of Petroleum Geologists) and is Vice President of Sigma Gamma Epsilon. Jason plans on attending graduate school.
Research Category
Research Proposals
Presentation Type
Research Proposal Poster
Document Type
Poster
Location
Havener Center, Carver-Turner Room
Presentation Date
11 April 2007, 1:00 pm - 3:00 pm
Formation of Rapakivi Textures in Granite of the Deer Isle Pluton, Maine
Havener Center, Carver-Turner Room
Ovoid K-feldspar mantled by Na-feldspar is called rapakivi. Rapakivi may form either by (1) decompression during ascent of felsic magma through the crust to a shallow magma chamber or by (2) mixing of mafic- and felsic-magma within a magma chamber. We suggest feldspars compositions may be used to distinguish between these two models. Rapakivi formed during decompression should have similar compositions. Conversely, if rapakivi have variable compositions this suggests variable interaction with compositionally unique magma at different times during crystallization. Cores and mantles of rapakivi feldspars from the Deer Isle Pluton, Maine will be drilled out and analyzed using Inductively Coupled Plasma - Mass Spectrometry and Optical Emission Spectrometry to determine subtle differences (ppm) in trace and Rare Earth Element abundances. These data will be used to resolve between the two models of formation.
