Abstract
Detection of small amount of mineral or
minerals which may otherwise be obscured by the
more abundant or easily detected minerals is possible
if H» analysis of various size fractions of clay rather
than the bulk clay sample. To study this, bulk clay
(<2fjm) samples from three profiles (Caernarfon,
Lleiniog and Penmon) were sub-divided into four size
fractions (2-0.63, 0.63-0.2, 0.2-0.063 and
<0.063fan). Clay fractions saturated with different
cations were mounted on the glass slides, treated by
different diagnostic treatments and X- rayed on a
Phillips Wide-range goniometer (PW-1050/23) which
was equipped with a PW-1011 generator producing Mn
filtered Fe-Ka radiation at 50kv and 40mA. The
results indicated that hydrous mica, vermiculite and
kaolinite were the dominant clay minerals showing
decreasing and increasing trends with depth and
occurred in the coarse fraction. Smectite, present in
minor amounts, occurred in the finer fraction with
varying amounts of chlorite which was found in the
coarse fraction in smaller amounts. Mineralogies of the soils were inferred to be originated from the underlying parent materials (Carboniferous sandstone) or contributing rocks, i.e. Shale
A. Ali , D.A. Jenkins. (1996) CLAY MINERALOGY OF GLACIAL DEPOSITS : II. VARIOUS CLAY FRACTIONS AND ORIGIN OF CLAY MINERALS IN SOILS, The Journal Soil & Environment , Volume 12, Issue (3-4).
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