Polycyclic aromatic hydrocarbons (PAHs) evidence for frequent combustion events on land during the Permian–Triassic transition in Northwest China
Palaeogeography Palaeoclimatology Palaeoecology,
Journal Year:
2024,
Volume and Issue:
642, P. 112152 - 112152
Published: March 15, 2024
Language: Английский
Land-ocean connections in organic carbon cycling amid the Early Triassic (Smithian-Spathian) revealed through compound specific isotope analysis
Geochimica et Cosmochimica Acta,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Language: Английский
Frequent Millennial‐Scale Oceanic Redox Oscillations Recorded by Negative Pyrite Δ33S: Implications for Phanerozoic Extinctions
Geophysical Research Letters,
Journal Year:
2025,
Volume and Issue:
52(9)
Published: April 30, 2025
Abstract
Phanerozoic
extinctions
may
have
been
influenced
by
oceanic
redox
oscillations,
as
indicated
mixing‐induced
negative
pyrite
Δ
33
S
(Δ
py
).
However,
the
frequencies,
intensities,
and
timescales
of
these
oscillations
remain
elusive.
Here,
we
measured
stratigraphic
from
currently
anoxic
Cariaco
Basin,
spanning
∼0.6
million
years.
Our
results
reveal
two
distinct
patterns
that
are
linked
to
specific
potentially
analogous
recorded
during
extinctions.
During
Marine
Isotope
Stage
1–2
9–10,
bottom
water
experienced
on
a
timescale
10,000
years,
resulting
in
slightly
(−0.03‰).
In
contrast,
period
160–200
kyr
BP,
underwent
frequent
millennial‐
centennial‐timescales,
leading
significantly
more
values
(−0.09‰).
We
highlight
similarly
fluctuations
contributed
end‐Guadalupian
extinction,
when
notably
akin
those
observed
our
study
were
prevalent.
Language: Английский
Perfect storms shape biodiversity in time and space
Evolutionary Journal of the Linnean Society,
Journal Year:
2023,
Volume and Issue:
2(1)
Published: Jan. 1, 2023
Abstract
Many
of
the
most
dramatic
patterns
in
biological
diversity
are
created
by
“Perfect
Storms”
—rare
combinations
mutually
reinforcing
factors
that
push
origination,
extinction,
or
accommodation
to
extremes.
These
include
strongest
diversification
events
(e.g.
Cambrian
Explosion
animal
body
plans),
proliferation
hyperdiverse
clades
insects,
angiosperms),
richest
biodiversity
hotspots
New
World
Tropical
Montane
regions
and
ocean's
greatest
pump,
tropical
West
Pacific),
severe
extinction
Big
Five
mass
extinctions
Phanerozoic).
Human
impacts
on
modern
biota
also
a
Perfect
Storm,
both
mitigation
restoration
strategies
should
be
framed
accordingly,
drawing
biodiversity's
responses
multi-driver
processes
geologic
past.
This
approach
necessarily
weighs
contributing
factors,
identifying
their
often
non-linear
time-dependent
interactions,
instead
searching
for
unitary
causes.
Language: Английский
The stable sulfur isotope and abundance fluxes of reduced inorganic sulfur and organic sulfur phases recorded in the Permian-Triassic transition of the Meishan type section
Organic Geochemistry,
Journal Year:
2024,
Volume and Issue:
196, P. 104808 - 104808
Published: June 4, 2024
Sulfur
cycle
fluxes
implicated
in
the
Permian-Triassic
mass
extinction
have
traditionally
been
studied
by
sulfur
phase
abundances
sedimentary
rocks
and
stable
isotopic
value
(δ34S)
of
seawater
sulfate
inferred
from
mineral
analyses.
This
information
might
be
complemented
studies
reduced
inorganic
organic
produced
following
bacterial
reduction.
To
explore
this
potential
δ34S
concentration
analyses
total
(TRIS)
–
separately
forms
kerogen
(Ker)
individual
organosulfur
compounds,
specifically
dibenzothiophenes
(DBTs)
has
conducted
on
sediments
across
Late
Permian
to
Early
Triassic
marine
type
section
Meishan-1
(South
China).
The
relatively
steady
profiles
(e.g.,
<
5
‰
variation)
all
phases
measured
through
much
late
were
indicative
a
primary
control,
but
other
biogeochemical
modulators
caused
prominent
fluctuations
TRIS
DBT
adjacent
event.
δ34STRIS
profile
displayed
notable
34S
enrichment
(+15
increase)
bed
22–24
concomitant
with
lower
δ34SDBT
values
(−7
decrease),
whereas
co-eval
δ34SKerS
remained
constant.
contrasting
data
suggests
dynamic
behavior
specific
diagenetic
sulfurisation
processes
may
resolved
discrete
compounds
(i.e.,
dibenzothiophenes,
DBTs),
dissipated
collective
represented
bulk
fraction.
inverse
trend
observed
between
resulted
negative
Δδ34SDBT-TRIS
identifying
an
pathway(s)
unusual
preference
over
pyrite
(FeS2)
for
lighter
isotope.
A
redox
control
δ34SDBTs
deviations
interval
was
confirmed
coincident
variation
TRIS/(TRIS
+
KerS)
(Py)
highly
reactive
(HR)
iron
ratios
(FePy/FeHR).
(Fe)
speciation
indicated
transition
ferruginous
conditions,
ruling
out
Fe2+
limitation
as
factor
bias
against
evident
formation.
depletion
DBTs
promoted
setting
arise
rapid
irreversible
reaction
substrates
labile
anions
(e.g.
HS-)
or
supported
especially
localised
sediment–water
depositional
microenvironment.
Our
study
highlights
incorporating
isotope
analytics
phases,
particularly
into
holistic
assessment
biochemical
periods
Earth's
past.
Language: Английский
Dynamics of nutrient cycles in the Permian–Triassic oceans
Earth-Science Reviews,
Journal Year:
2024,
Volume and Issue:
258, P. 104914 - 104914
Published: Sept. 4, 2024
Language: Английский
Ultrahigh-Resolution Mass Spectrometry Advances for Biogeochemical Analysis: From Seafloor Sediments to Petroleum and Marine Oil Spills
Journal of the American Society for Mass Spectrometry,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 9, 2024
This
Perspective
explores
the
transformative
impact
of
ultrahigh-resolution
mass
spectrometry
(UHR-MS),
particularly
Fourier
transform
ion
cyclotron
resonance
(FT-ICR-MS),
in
characterization
complex
environmental
and
petroleum
samples.
UHR-MS
has
significantly
advanced
our
ability
to
identify
molecular
formulas
mixtures,
revolutionizing
study
biogeochemical
processes
organic
matter
evolution
on
wide
time
scales.
We
start
by
briefly
reviewing
main
technological
advances
context
applications,
highlighting
some
challenges
technology
such
as
quantitation
structural
identification.
then
showcase
a
selection
impactful
applications
published
last
20+
years.
In
field
lipidomics,
high-resolution
analysis
lipids
sediments
enables
multiproxy
studies
provides
novel
insights
into
past
conditions.
also
facilitated
kerogen,
complex,
poorly
soluble
mixture
formed
from
sedimented
over
geological
scales,
identification
polar
compounds
within
its
fractions.
(geo)chemistry,
enabled
biomarkers
petroporphyrins,
asphaltenes,
high-molecular-weight
naphthenic
acids,
shedding
light
complexity
crude
oil.
The
application
oil
spill
science
revealed
significant
transformations
during
weathering
processes,
photo-oxidation,
which
are
crucial
for
assessing
spills
improving
preparedness
future
spills.
These
advancements
underscore
role
this
maturing
analytical
deepening
understanding
geochemical
cycles,
potential
research
directions
geochemistry.
Language: Английский