The
high
frequency
of
fires
in
mires
during
the
formation
some
mire
systems
Jurassic
is
thought
to
have
influenced
how
terrestrial
ecosystems
evolved.
Ancient
mires,
now
present
as
coal
seams,
contain
high-resolution
paleoenvironmental
and
paleoclimatic
records.
Thus,
analysis
beds
provides
valuable,
insightful
practical
knowledge
on
changes
paleoclimate
and,
this
case,
fire
prevalence.
Using
petrographic,
carbon
isotopic,
mercury
content,
polycyclic
aromatic
hydrocarbon
(PAH)
determinations,
Middle
No.
4
Coal
from
Binchang
mining
area,
Ordos
Basin,
was
examined
order
understand
nature
mires.
results
show
that
exhibits
a
content
inertinite
(average
70%).
Notably,
correlation
coefficient
(r
=
0.79)
between
concentration
PAH
(with
>3
rings)
proportion
indicates
predominantly
result
fire.
presence
natural
char
coke
coals
further
substantiates
frequent
incidence
southern
Basin.
High
can
be
attributed
availability
fuel
(i.e.,
buildup
organic
material),
atmospheric
oxygen
levels,
intermittent
dry
climatic
conditions.
average
mean
reflectance
(specifically,
fusinite
semifusinite)
bed
ranges
1.22%
1.90%,
well
pyrogenic
PAHs,
suggesting
their
may
been
affected
by
low-
moderate-temperature
significant
impacts
hydrological
ecosystems.
These
effects
included
disruption
soil
structure
post-fire,
possible
occurrence
anoxic
events
lakes.
Energy Exploration & Exploitation,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 5, 2025
The
study
of
coal
seams
provides
valuable
insights
into
the
environmental
changes
that
have
occurred
throughout
Earth's
geological
history.
Coal
formation
was
notably
widespread
during
Jurassic
period
in
mid-latitude
East
Asia.
To
reconstruct
paleoenvironmental
conditions
prevailing
peat
Turpan-Hami
Basin,
China,
we
conducted
a
comprehensive
44
Middle
samples.
Our
investigative
approach
encompassed
petrographic
analysis,
and
gas
chromatography-mass
spectrometry
to
compare
our
findings
with
existing
literature.
Biomarkers
from
steranes
diterpenes
suggest
OM
coals
No.
4
seam
predominantly
originated
terrestrial
higher
plants,
conifers
being
one
important
sources
OM.
Vitrinite
reflectance,
hopane,
sterane
maturity
biomarkers
indicate
most
samples
exhibit
low
thermal
maturity.
Previous
studies
suggested
No.4
formed
saline
water
environment
based
on
trace
element
indicators.
However,
this
study,
biomarker
analysis
(low
gammacerane
index,
high
Pr/Ph
ratio,
sulfur
content),
suggests
accumulation
freshwater
environments.
anomaly
indicators
previous
may
be
attributed
introduction
elements
overlying
strata
via
surface
(groundwater)
or
hydrothermal
fluids.
Since
vegetation
depositional
environments
indicated
by
are
more
consistent
setting,
offer
reliable
indication
compared
Ore Geology Reviews,
Год журнала:
2023,
Номер
161, С. 105663 - 105663
Опубликована: Сен. 7, 2023
Coal
seams,
as
a
terrestrial
carbon
sink,
are
not
only
important
sedimentary
and
energy
mineral
resources
but
also
excellent
recorders
of
paleoclimate
change.
The
study
coal-bearing
strata
is
particularly
significant
in
exploring
the
relationship
between
geological
records
orbital
forcing.
However,
understanding
coal
seams
different
sources
organic
matter
astronomical
cycles
incomplete.
This
focuses
on
Dameigou
Formation,
typical
Jurassic
seam
Qaidam
Basin,
Northwestern
China.
Organic
petrology
analysis,
biomarker
whole-rock
analysis
were
combined
to
reconstruct
vegetation
types
paleolake
water
level
changes
during
deposition.
In
addition,
using
time-series
method
high-precision
gamma-scanning
data
from
Well
D1,
we
established
floating
timescale
time-depth
model
for
cyclostratigraphical
analysis.
results
show
that
strata,
preserves
well-developed
Milankovitch
cycles,
climatic
conditions
formation
vary
among
seams.
Different
patterns
variation
eccentricity,
obliquity,
procession
determine
thickness
seam.
great
significance
factors
influenced
climate
evolution
deposition
Middle
Jurassic.
Acta Geologica Sinica - English Edition,
Год журнала:
2024,
Номер
98(4), С. 1064 - 1085
Опубликована: Авг. 1, 2024
Abstract
Inertinite‐rich
coal
is
widely
distributed
in
the
Ordos
Basin,
represented
by
No.
2
seam
of
Middle
Jurassic
Yan'an
Formation.
This
paper
combined
petrology
and
geochemistry
to
analyze
origin
inertinite,
changes
coal‐forming
environment
control
characteristics
wildfire.
Research
has
shown
that
there
are
two
forms
inertinite
sources
study
area.
Alongside
typical
fusinization,
wildfire
events
also
play
a
substantial
role
formation.
There
significant
fluctuations
samples
at
different
depths.
Coal
were
formed
dry
forest
swamp
with
low
water
levels
strong
oxidation,
which
have
high
content,
wet
limnic
showed
content.
Conversely,
content
origins
does
not
fully
correspond
depositional
characterized
dryness
oxidation.
Nonpyrogenic
inertinites
significantly
influenced
climatic
conditions,
while
pyrofusinite
was
entirely
controlled
conditions
but
rather
directly
impacted
events.
The
oxygen
level
main
factor
causing
widespread
Overall,
combination
activity
oxidation
generates
Basin.
Geomechanics and Geophysics for Geo-Energy and Geo-Resources,
Год журнала:
2023,
Номер
9(1)
Опубликована: Ноя. 8, 2023
Abstract
The
extensive
thinning
and
destruction
of
North
China
Craton
(NCC)
during
the
Early
Cretaceous
led
to
development
numerous
rift
basins
petroleum
systems.
However,
specific
relationship
between
NCC
evolution
hydrocarbon
generation
accumulation
in
these
sedimentary
is
still
unclear.
In
this
study
organic
geochemistry
oil-source
correlation
analyses
were
conducted
investigate
hydrocarbons
potential
migration
pathway
representative
Fuxin
Basin.
Results
demonstrate
that
semi-deep
lacustrine
source
rocks
developed
Jiufotang
Formation
(K
1
jf)
west
upper
Shahai
sh)
east,
both
which
are
enriched
with
matter
content
kerogen
Types
II
III.
Based
on
hierarchical
cluster
analysis
crude
oils
biomarker
fingerprints,
two
oil
types
(A
B)
deduced.
Type
A
characterized
by
high
gammacerane,
low
pristane/phytane,
relatively
C
29
regular
sterane
methylphenanthrene
index,
consistent
K
jf
characteristics
west.
Therefore,
likely
generated
from
rock
accumulated
turbidite
sand
bodies
and/or
migrated
sh
reservoir
through
strike-slip
faults.
B
dominated
moderate
27
1,2,5-trimethylnaphthalenes,
good
agreement
4
features.
basin
simulation
revealed
formations
was
linked
a
rapid
subsidence
basin,
induced
intense
extension
Cretaceous.
Subsequently,
subduction
Western
Pacific
plate
earliest
Late
epigenetic
fractures,
enabling
This
sheds
light
sources
an
extensional
setting
provides
insights
into
dynamic
process
associated
evolution.
