Date of Award


Degree Name

Master of Science


Geological and Environmental Sciences

First Advisor

Dr. W. Thomas Straw

Second Advisor

Dr. William B. Harrison III

Third Advisor

Dr. John Grace

Access Setting

Masters Thesis-Open Access


The sedimentation rate of the A-l Evaporite of Michigan was determined by analysis of micrometeorites found as inclusions in the halite deposit. The samples were obtained from the Dow Chemical Company salt well number eight. The residue from the dissolved salt was magnetically separated and later analyzed by Particle Induced X-ray Emission (PIXE), X-ray diffraction , and microprobe techniques. The amount of extraterrestrial material was determined from the quantity of nickel present.

A sedimentation rate of .01 to .4 centimeters per year was calculated for the salt based on a constant influx rate of meteoritic material of 1 x 104 tons per year. This sedimentation rate is much slower than previously reported sedimentation rates for salt. This relatively slow sedimentation rate and the close association of hydrocarbons with salt suggests that the original hydrocarbon content of petroleum-producing evaporite basins may be much greater than previously believed.

Included in

Geology Commons