|
Thin section, grain size, scanning electron microscope and XRD analyses are all
provided in house for rapid turnaround with high quality results. Samples are prepared
for thin section analysis by first impregnating the samples with epoxy to augment
sample cohesion and to prevent loss of material during the grinding procedure. A
blue dye is added to the epoxy to highlight the pore spaces. Each of the samples
is mounted on a frosted glass slide and then cut and ground in water to a thickness
of approximately 30 microns. Standard thin sections are stained for carbonates (Alizarin
Red-S and potassium ferricyanide) and potassium feldspar (sodium cobaltinitrite).
|
A general thin section description includes a complete description of the mineral
constituents of the rock, allochems, texture, sorting (or crystal size range), porosity
types and the type and abundance of pore-filling cements or alteration products.
A detailed thin section description includes all the information in the general
description, plus a 250-point count analysis to quantify grain types, matrix, cements,
and pore types. The report consists of a written discussion of the sample set, a
description of each sample, and descriptions of the photomicrographs.(2 color photomicrographs
are included).
Cathodoluminescence
An electron beam is used to activate emission from trace elements in the mineral
structure. Trace elements in cement phases are used to determine the diagenetic
history of sediments.
Epifluorescence Petrography
A thin section is impregnated with autofluorescing epoxy and is analyzed under UV
light. The fluorescence is particularly useful in highlighting microfractures and
microporosity and their relation (interconnectedness) to the macropore system.
|