Deep Earth Processes
What we do....
Dr Holyoke's research and teaching interests are in the general area of structural geology applied to solving problems related to the physical and chemical evolution of the Earth’s crust and upper mantle. His group uses a combination of active testing of how changing variables in experiments affects the microstructures that develop due to specific deformation mechanisms. They also use observational analysis of naturally deformed rocks to constrain the conditions that produce these same microstructures in nature. Understanding these grain-scale processes contributes to our understanding of larger scale processes and controls on plate tectonics
Associated Laboratories and Equipment
- Research and teaching computer laboratories - approximately 30 multimedia computers with direct Internet connections
- Digitizers, digital cameras, flat-bed and slide scanners - for image processing
- Geoscience visualization laboratory with three Sun Ultra-10 computers
- Large format color ink jet plotter - for poster presentations
- Petroleum geology and computer mapping software (Geographix, Geoquest, ArcView)
Environmental Scanning Electron Microscopy Laboratory
Scanning Electron Microscopy is an integral part of many aspects of research in geology, biology, chemistry, engineering, physics and polymer sciences. Our facility supports a FEI (formerly Philips) Quanta 200 Environmental Scanning Electron Microscope and EDS attachment. This is an interdisciplinary facility, servicing the entire University of Akron community and the surrounding northeastern Ohio region.
ESEM affords the user the ability to image wet, oily, dirty, uncoated specimens in their natural state, without the need for a high vacuum and electrical conductivity required by a conventional SEM. ESEM technologies allow the sample to be exposed to a range of pressures, temperatures and gas compositions. The tolerance of gases at pressures above 4.6 Torr allows saturated vapor pressures to be maintained at temperatures above freezing, thus allowing the presence of liquid water and precluding the need to dry specimens before imaging them. An ESEM also allows the environment to be altered within the sample chamber, enabling the ESEM to serve as an experimental chamber, allowing direct visualization of dynamic processes. An ESEM has the high resolution capability to obtain high quality images of uncoated, hydrated samples in a low-vacuum environment, opening a vast array of research opportunities, extending the capabilities of electron imaging to new frontiers.
Our facility is available to researchers from the Northeast Ohio area. If you have a question about our ESEM and whether it will fulfill your imaging and analytical needs, please feel free to contact us. We will be happy to answer any questions that you might have. This lab was created with the support of NSF EAR Grant 0320898.
This lab was created with the support of NSF EAR Grant 0320898.
- Internal user rate without technician-$35/hr
- Internal user rate with technician-$50/hr
- External user rate without technician– $85/hr
- External user rate with technician- $100/hr
Mr. Thomas J. Quick
- X-ray diffraction system - determines mineral phases in powdered samples
- Image analyzer Cathodluminoscope - identifies mineral phases in thin sections
- Research microscopes, rock saws and automated thin section equipment - for preparation of rock and mineral specimens
- Resistivity Transmitter and Receiver
- Portable 12-Channel Seismograph
(All are used for measuring the geophysical properties of surficial deposits and shallow features such as buried valleys.)
- Inductively coupled plasma spectrometer (ICP) - determines chemical composition of natural waters
- Atomic absorption spectrometer (AA) - determines chemical composition of natural waters
- Ion chromatograph - determines chemical composition of natural waters
- Gas chromatograph - analyzes organic compounds
- Coal analyzer and oxygen bomb calorimeter - for coal analyses
- Two passenger vans
- A four-wheel-drive vehicle
- Portable rock corer - collects rock samples up to 18 inches long and 1 inch in diameter
- Giddings soil probe - core samples of glacial deposits up to 40 feet long
- Flow meter - measures stream velocity
- Dissolve oxygen meter, pH meter and conductivity meter
- A variety of sediment piston corers
- Magnetic susceptibility bridge
Environmental Magnetics Laboratory
A new environmental magnetics laboratory has been constructed in the Department of Geology with funding from the U.S. National Science Foundation and the State of Ohio. This laboratory contains all the equipment needed for measuring the full suite of environmental magnetic parameters. Magnetic susceptibility can be measured on whole-cores and also at very high resolution of split cores. Subsamples can be measured for the frequency dependence of susceptibility. A Molspin magnetometer is used to measure the magnetic remanence. An AF demagnetizer with ARM attachment allows both the demagnetization of samples and imparting of an ARM. A pulse magnetizer is used to impart the samples with an IRM. The measurement of the full hysteresis loop, on samples as small as a few milligrams, is accomplished with an alternating gradient magnetometer.
- Bartington Instruments MS2 Magnetic susceptibility system with 2 loop sensors, high-resolution surface scanning sensor and dual frequency single sample sensor.
- Molspin Spinner Magnetometer
- Dtech 2000 AF demagnetizer capable of AF fields to 200 mT as well as both ARM and pARM
- ASC IM10-30 Impulse Magnetizer with 2 coil (fields to 12 kGauss) and a 1.25 coil (fields to 26 kGauss)
- Magnetic Measurements Ltd. fluxgate controlled Low Field 2.5 m3 Cage
- Princeton Measurements Corp. Alternating Gradient Magnetometer