Repeated Structural Reworking in the Basement of the Central Colombian Andes Unraveled by a Multi‐Chronometric Approach
Tectonics,
Journal Year:
2024,
Volume and Issue:
43(10)
Published: Oct. 1, 2024
Abstract
Long‐lived
orogens
are
often
characterized
by
basement
blocks
affected
polyphase
thick‐skinned
deformation.
Deciphering
these
events
is
challenging
due
to
the
heterogeneous
and
complex
structural
histories
resulting
from
superposition
of
multiple
deformation
phases.
For
instance,
Central
Cordillera
Colombia
was
shaped
tectonic
phases
during
Mesozoic
Cenozoic,
which
have
been
poorly
constrained
in
both
space
time.
To
unravel
history
this
mountain
belt,
we
conducted
field
mapping
applied
a
multi‐chronometric
approach
that
included
zircon
apatite
U‐Pb
dating
igneous
basement,
epidote
titanite
structurally
controlled
mineralization
events,
K‐Ar
fault
rock
illite,
fission
track
(U‐Th‐Sm)/He
bedrock
thermochronology
zircon.
The
results
reveal
six
along
two
systems
past
184
Myr.
This
started
Jurassic
with
magmatism
ductile
deformation;
followed
brittle‐ductile
fluid‐assisted
basin
subsidence
inversion
Cretaceous.
Finally,
Cenozoic
brittle
strike‐slip
compressional
Our
findings
show
response
reworking,
highlighting
prominent
role
ancient
upper‐plate
discontinuities,
magmatism,
fluids.
Language: Английский
Comparison between thermal models across the Middle Magdalena Valley, Eastern Cordillera, and Eastern Llanos basins in Colombia
Open Geosciences,
Journal Year:
2024,
Volume and Issue:
16(1)
Published: Jan. 1, 2024
Abstract
In
this
research,
we
compared
thermochronological
and
traditional
one-dimensional
thermal
models
across
the
Middle
Magdalena
Valley
(MMV),
Eastern
Cordillera,
Llanos
Basins
in
Colombia.
These
allow
us
to
relate
cooling/heating
histories
exhumation
events,
subsidence,
fault
activities,
fluid
flow.
The
Cordillera
are
discriminated
as
prospective
zones
for
hydrocarbon
(HC)
generation.
De
Armas
Syncline
at
MMV
basin
shows
high
maturity
(127°C),
describing
rocks
completely
depleted
terms
of
HC
eastern
zone
syncline
is
buried
until
it
reaches
temperatures
above
150°C.
contrast
between
suggests
a
possible
sediment
supply
scenario
from
west
east
Soapaga
Fault.
basin,
both
explain
latest
uplift
processes
hinterland
foothill
basin.
evolution,
three
basins
different,
reaching
different
levels
burial
maturity.
However,
cooling
events
related
exhumation,
have
similarities
they
controlled
by
mountain
building
Language: Английский