Ad. Cohen et Em. Stack, SOME OBSERVATIONS REGARDING THE POTENTIAL EFFECTS OF DOMING OF TROPICAL PEAT DEPOSITS ON THE COMPOSITION OF COAL BEDS, International journal of coal geology, 29(1-3), 1996, pp. 39-65
Citations number
87
Categorie Soggetti
Mining & Mineral Processing","Geosciences, Interdisciplinary","Energy & Fuels
Several important concepts relative to the origin of coal beds can be
gleaned from studies of modern domed and planar peat deposits in tropi
cal-subtropical settings. These are: (1) laterally, some portions of a
single continuous peat deposit may be domed and some portions may be
planar; (2) domed deposits are most often found to have begun as plana
r deposits; (3) domed-formed peat facies may be overridden by planar-f
ormed peat facies, due to such factors as sea level rise and/or increa
sed rate of local and basinal subsidence; (4) domed peat facies tend t
o have less mineral matter and contain fewer inorganic splits than pla
nar facies; (5) sulfur intrusion from marine waters can be retarded by
doming, allowing low-sulfur peats to form relatively near to the coas
tline; (6) marine transgression can cause high-sulfur, marine-influenc
ed, planar, peat facies to override freshwater domed or planar facies,
resulting in enrichment of the upper parts of these underlying facies
in sulfur and ash; (7) dome-formed peat facies tend to be thicker and
more uniform in composition than planar-formed facies, with dome-form
ed peat facies having the potential to produce the more uniform bright
coal types (clarains and vitrains) and planar-formed pear facies ofte
n producing duller coal types and/or alternating, durainic (inertinite
-rich) and vitrainic (wood-derived) bands; (8) actively developing pea
t domes in wet settings often exhibit no appreciable increase in inert
initic material toward their tops; although the tops of either domed o
r planar peat deposits can be enriched in inertinitic material if the
water table is lowered by either local or regional changes in hydrolog
y or climate.