Radiogenic
heat
production
is
fundamental
to
the
energy
budget
of
planets.
Roughly
half
that
Earth
loses
through
its
surface
today
comes
from
three
long-lived,
heat-producing
elements
(potassium,
thorium,
and
uranium).
These
have
long
been
believed
be
highly
lithophile
thus
concentrate
in
mantle
rocky
However,
our
study
shows
they
all
become
siderophile
under
pressure
temperature
conditions
relevant
core
formation
large
planets
dubbed
super-Earths.
Mantle
convection
super-Earths
then
primarily
driven
by
heating
rather
than
a
mix
internal
cooling
above
as
Earth.
Partitioning
these
sources
radiogenic
into
remarkably
increases
core-mantle
boundary
(CMB)
total
flow
across
CMB
Consequently,
are
likely
host
long-lived
volcanism
strong
magnetic
dynamos.
Journal of Geophysical Research Planets,
Год журнала:
2025,
Номер
130(2)
Опубликована: Фев. 1, 2025
Abstract
Atla
Regio
is
a
large
topographic
rise,
at
the
equator
of
Venus,
considered
to
sit
above
young
mantle
upwelling.
Hosting
several
giant
shield
volcanoes,
including
Maat
Mons,
it
strong
candidate
for
recent
eruptive
activity.
Through
detailed
analysis
material
units
and
structures
Ozza,
Sapas
northern
Dali
Chasma
surrounding
plains,
we
have
unraveled
tectono‐magmatic
evolution
Regio.
Lithostratigraphic
analysis,
volcanic
styles,
lava
flow
relationships,
rift–associated
clusters,
graben‐fissure
systems
pit
cratering,
in
relation
regional
plains
other
older
features,
has
enabled
establishment
model
volcanism.
Structural
reveals
that
Ozza
Mons
transition
outward
into
three
major
rifts,
two
new,
unnamed
volcanoes
are
identified.
Our
evidenced
by
stratigraphy
cross‐cutting
relationships
with
respect
stratigraphic
marker
provided
ejecta
halo
Uvaysi
impact,
using
sound
principles.
A
relative
chronostratigraphic
framework
area
around
thus
been
constructed,
our
findings
agreement
prior
research.
new
history
proposed
here,
where
volcanism
was
initially
concentrated
along
Chasma,
before
plume
took
over
finally,
became
most
locus
We
propose
pattern
displaced
centers
here
indicative
minor
crustal
adjustments
relatively
long‐lived
plume.
Journal of Geophysical Research Planets,
Год журнала:
2025,
Номер
130(3)
Опубликована: Март 1, 2025
Abstract
The
Baltis
Vallis
channel
on
Venus
preserves
a
record
of
long‐wavelength
deformation
generated
by
convecting
mantle,
providing
unique
window
into
the
planet's
geodynamics.
Notably,
observed
topography
along
is
not
downhill,
suggesting
complex
interactions
between
surface
processes
and
mantle
dynamics.
We
statistically
compare
dynamic
with
topographies
suite
stagnant‐lid
convection
models
to
constrain
Venus'
interior
Vallis's
relatively
young
age
(likely
250
Myr)
low
root‐mean‐square
relief
217
m
indicate
vigorous
in
Venus's
Rayleigh
number
4
,
implying
viscosity
1–2
orders
magnitude
lower
than
Earth's.
This
difference
may
result
from
either
water‐rich,
less‐degassed
or
higher‐temperature
beneath
an
insulating
lid.
Additionally,
our
simulations
suggest
that
melt
advection
dominate
heat
transport
Venus,
potentially
leading
non‐linear
temperature
profiles
crust.
Upcoming
missions
such
as
VERITAS
EnVision
will
deliver
higher‐resolution
gravity
topographic
data,
further
constraints
present‐day
internal
dynamics
origin
Vallis.
Astrobiology,
Год журнала:
2024,
Номер
24(4), С. 423 - 441
Опубликована: Апрель 1, 2024
The
possible
existence
of
a
microbial
community
in
the
venusian
clouds
is
one
most
intriguing
hypotheses
modern
astrobiology.
Such
must
be
characterized
by
high
survivability
potential
under
severe
environmental
conditions,
extreme
which
are
very
low
pH
levels
and
water
activity.
Considering
different
scenarios
for
origin
life
geological
history
our
planet,
few
these
discussed
context
hypothetical
within
cloud
layer.
liquid
on
surface
ancient
Venus
key
outstanding
questions
influencing
this
possibility.
We
link
inherent
attributes
as
we
know
it
that
favor
persistence
such
an
environment
review
life's
its
evolution
strong
greenhouse
effect
loss
Venus.
also
propose
roadmap
describe
novel
methodological
approach
astrobiological
research
framework
future
missions
to
with
intent
reveal
whether
exists
today
planet.
Geophysical Research Letters,
Год журнала:
2023,
Номер
50(15)
Опубликована: Июль 29, 2023
Abstract
The
long‐wavelength
gravity
and
topography
of
Venus
are
dominated
by
mantle
convective
flows,
hence
sensitive
to
the
planet's
viscosity
structure
density
anomalies.
By
modeling
dynamic
signatures
making
use
a
Bayesian
inference
approach,
we
investigate
Venusian
constraining
radial
variations.
We
performed
inversions
under
wide
range
model
assumptions
that
consistently
predicted
existence
thin
low‐viscosity
zone
in
uppermost
mantle.
is
about
235
km
thick
has
reduction
5–15
times
with
respect
underlying
Drawing
parallel
Earth,
reduced
could
be
result
partial
melting
as
suggested
for
origin
asthenosphere.
These
results
support
interpretation
geologically
active
world
predominantly
governed
ongoing
magmatic
processes.
Journal of Geophysical Research Planets,
Год журнала:
2023,
Номер
128(10)
Опубликована: Окт. 1, 2023
Abstract
Venus'
tectonic
evolution
is
not
well
understood.
Thousands
of
kilometers
possible
subduction
sites
on
Venus
have
been
identified
along
networks
rift
zone
trenches
called
chasmata.
Rift
zones
are
strong
candidates
for
recycling
due
to
pre‐existing
weaknesses
in
the
lithosphere.
Recently,
peel‐back
delamination
(PBD)
was
proposed
as
a
mechanism
regional‐scale
lithospheric
initiated
at
Venusian
(Adams
et
al.,
2022,
https://doi.org/10.1029/2022je007460
).
PBD
occurs
when
mantle
becomes
sufficiently
thick
and
negatively
buoyant
decouple
peel
away
from
overlying
crust
remaining
surface.
Both
positively
lithosphere
were
shown
undergo
buoyancy‐driven
PBD,
though
inhibited
by
increasing
positive
plate
buoyancy.
In
this
study,
we
use
2D
numerical
models
verify
that
can
be
thinner,
more
than
with
no
plume‐rift
interactions.
Our
results
show
plume‐induced
plates
facilitated
excess
negative
buoyancy
plume
force,
it
crustal
decreasing
width.
We
propose
an
age‐progressive
framework
zones,
where
young,
thin
require
larger
force
destabilized
thicker,
yet
still
plates.
thickness
constraints
predict
may
most
likely
initiate
near
Dali‐Diana
Chasmata
system.
