The Transfer of Volatiles Within Interacting Magmas and its Effect on the Magma Mingling ProcessAuthor InfoSocial Media
2011, BS, Kent State University, College of Arts and Sciences / Department of Geology.
The input of volatile-charged mafic magma into chemically evolved felsic magma reservoirs in the shallow crust leads to the exchange of heat and chemical components that may serve as the trigger for subsequent volcanic eruption. The exchange of volatiles, which occurs via diffusion and potentially through fluid movement, is particularly important to this process.
In order to simulate the magma mingling process and the role of volatiles within this process, we have conducted a series of hydrothermal experiments involving a hydrous basaltic-andesite glass containing trace olivine (prepared from a natural sample of Augustine volcano in Alaska’s Aleutian Arc) with crystal-deficient, anhydrous or hydrous Los Posos rhyolite glass (also natural) at 100 MPa. Some experiments were conducted under fluid-absent conditions while others involved O-H-Cl±S-bearing fluids. Temperature was varied during these experiments, with most beginning at 1100°C. Temperature was subsequently reduced to 800°C in several steps, where it remained until an isobaric quench. The run durations ranged from 25 to 125 hours.
The experimental products exhibit interesting textural and chemical features. The rhyolitic run product glass, whether hydrous or anhydrous initially, exhibits minimal crystallization throughout the experiments, whereas the starting basaltic-andesite glass shows significant crystallization of iron and titanium oxides, plagioclase, and pyroxene. The exchange of Cl between the two melts was significant for fluid-present and fluid-absent conditions, and the concentration of Cl in the more felsic melt was strongly controlled by well established Cl solubility relationships involving the cations Ca, Al, Na, and Mg and the presence or absence of S.
Elizabeth Griffith, PhD (Committee Chair)
James Webster, PhD (Advisor)
Donald Palmer, PhD (Committee Member)
Brett Ellman, PhD (Committee Member)
Bentley Wall, PhD (Committee Member)
volatile; volatiles; chlorine; magma; mingling; mixing; volcanology
Wayman, M. (2011). The Transfer of Volatiles Within Interacting Magmas and its Effect on the Magma Mingling Process. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/
Wayman, Matthew. "The Transfer of Volatiles Within Interacting Magmas and its Effect on the Magma Mingling Process." Electronic Thesis or Dissertation. Kent State University, 2011. OhioLINK Electronic Theses and Dissertations Center. 02 Mar 2015.
Wayman, Matthew C. "The Transfer of Volatiles Within Interacting Magmas and its Effect on the Magma Mingling Process." Electronic Thesis or Dissertation. Kent State University, 2011. https://etd.ohiolink.edu/