Geoscience Frontiers,
Journal Year:
2024,
Volume and Issue:
15(5), P. 101866 - 101866
Published: May 11, 2024
Mesozoic
magmatic
rocks
occur
widely
in
the
South
China
Block
and
are
generally
interpreted
as
manifestations
of
subduction
Paleo-Pacific
oceanic
lithosphere
beneath
Asia.
Subduction-driven
magmatism
southeast
(SE)
continued
from
Late
Permian
through
Cretaceous
with
an
inferred
lull
between
125
Ma
115
that
is
known
literature
"magmatic
quiescence".
We
report
in-situ
zircon
U–Pb
ages,
Hf–O
whole-rock
Sr–Nd
isotopes,
geochemistry
granitoids
on
Hainan
Island
discuss
their
evolution
within
framework
geodynamics
SE
China.
recognize
two
main
stages
emplacement
Hainan,
first
around
120
then
100–95
Ma,
displaying
high-K
calc-alkaline,
I-type
geochemical
affinities.
Granites
both
age
groups
enriched
LILE
LREE,
but
depleted
Nb,
Ta,
Ba,
Sr,
Eu.
The
granites
have
εHf(t)
values
–2.6
to
2.3
corresponding
Hf
crustal
model
ages
(TDMC),
ranging
0.79
Ga
1.03
Ga,
δ18O
6.9
‰
7.7
‰.
Zircons
–4.2
1.1
1.08
1.42
6.7
8.4
Increasing
younger
crystallization
indicate
addition
more
juvenile
components
reworking
material
into
melt
evolution.
range
–0.4
–4.1
–7.7
–4.0,
respectively.
calculated
two–stage
(T2DM)
clusters
1.25
1.53
Ga.
These
isotopic
data
suggest
magmas
were
produced
by
partial
melting
Mesoproterozoic
metabasaltic
rocks,
which
make
up
much
crystalline
basement
southern
Cathaysia
block.
characteristics
resemble
those
arcs
Circum–Pacific
orogenic
belts
identical
nearly
coeval
granitoid
intrusions
continental
fragments
Sea
basin.
interpret
these
Peri–South
region
remnants
a
once
contiguous
arc
system
bounded
margin
entire
Southeast
Our
findings
do
not
support
existence
episode
quiescence
geological
record
Gondwana Research,
Journal Year:
2023,
Volume and Issue:
128, P. 161 - 263
Published: Oct. 19, 2023
Based
on
the
marine
magnetic
anomalies
identified
in
Argo
Abyssal
Plain
offshore
northwestern
Australia,
conceptual
continent
of
Argoland
must
have
rifted
off
Late
Jurassic
(∼155
Ma)
and
drifted
northward
towards
SE
Asia.
Intriguingly,
Asia
there
are
no
intact
relics
a
major
such
as
India,
but
instead
region
displays
an
intensely
deformed,
long-lived
accretionary
orogen
that
formed
during
more
than
100
million
years
oceanic
continental
subduction.
Within
this
orogen,
fragments
may
represent
parts
Argoland.
After
accretion
these
fragments,
was
further
deformed.
We
compiled
orogenic
architecture
history
post-accretionary
deformation
Asia,
well
NW
Australian
passive
margin.
Gondwana-derived
blocks
mega-units
SW
Borneo,
Greater
Paternoster,
East
Java,
South
Sulawesi,
West
Burma,
Mount
Victoria
Land
collectively
These
found
between
sutures
with
Triassic
to
Middle
basins
all
pre-date
break-up
systematically
restore
within
upper
plate
system
above
modern
Sunda
trench,
use
estimate
where
accreted
at
Sundaland
(Eurasian)
margin
Cretaceous
(∼110–85
Ma),
subsequently
reconstruct
their
tectonic
transport
back
Australian-Greater
Indian
Our
reconstruction
shows
originated
northern
Bird's
Head
east
Wallaby-Zenith
Fracture
Zone
west,
south
which
it
bordered
India.
show
lithospheric
fragment
broke
northwest
Australia
consisted
multiple
intervening
basins,
we
here
call
Argopelago.
up
into
Argopelago
rifting
Lhasa
from
Gondwana,
were
surrounded
by
similar
Zealandia
reconstructed
Adria
Mediterranean.
Geophysical Research Letters,
Journal Year:
2021,
Volume and Issue:
48(18)
Published: Sept. 9, 2021
Abstract
Distributions
of
slabs
within
Earth's
mantle
are
increasingly
used
to
reconstruct
past
subduction
zones,
based
on
first‐order
assumptions
that
sink
vertically
after
slab
break‐off,
and
thus
delineate
paleo‐trench
locations.
Non‐vertical
motions,
which
occur
prior
represent
a
potentially
significant
source
error
for
slab‐based
plate
reconstructions,
but
poorly
understood.
We
constrain
lateral
migration
the
Indian
overlying
India‐Asia
collision
zone
by
comparing
tomographically
imaged
structure
with
plate‐kinematic
constraints.
Following
coupling
Australian
plates
at
onset
collision,
∼1,000
km
was
driven
vertical
slab.
The
sinking
behaviors
individual
do
not
evolve
in
isolation,
instead
influence,
or
influenced
by,
other
same
network.
Hence,
migrations
may
be
determined
interpreting
behavior
collectively,
respect
kinematics.
Gondwana Research,
Journal Year:
2022,
Volume and Issue:
111, P. 142 - 164
Published: Aug. 4, 2022
Combined
U-Pb
zircon
data
of
granitic,
dioritic,
and
gabbroic
suites
reveal
development
arc-related
magmatism
in
South
Borneo
throughout
the
Late
Mesozoic
but
dominantly
Cretaceous
(144–72
Ma).
igneous
constitute
Schwaner-Singkawang,
Kuching-LongPahangai,
Meratus-West
Java
magmatic
arc
zones.
Arc-related
felsic
are
low-K
tholeiitic,
calc-alkaline
to
high-K
calc-alkaline.
Most
them
metaluminous
(A/CNK
0.7–1.1),
I-type,
have
high
large-ion
lithophile
element
(LILE)
contents,
low
high-field
strength
(HFSE)
crystallization
temperatures
(688–769
°C).
A
few
rocks
adakite
characteristics,
such
as
Sr/Y
Y.
granitic
from
Schwaner,
which
evolved
at
elevated
temperature
(761–852
°C),
diverse
compositions
that
range
I-type
transitional
A-type.
The
highly
fractionated
chemistry
these
samples
is
attributed
an
intraplate
stretching
tectonic
setting.
This
regime
consistent
with
controls
synchronous
tholeiitic
within
North
Schwaner.
Two
subduction
systems
beneath
Sundaland
converged
interacted
during
Cretaceous.
Paleo-Pacific
north
built
arc-trench
architectures,
shown
by
Early
Lupar
Line
mélange,
Schwaner
Singkawang
arc,
mélange
Kuching-LongPahangai
arc.
Meso-Tethys
southeast
produced
Schwaner-Singkawang
Meratus
Luk-Ulo
mélanges,
When
entered
into
Cretaceous,
slab
rollback
led
crustal
regions,
production
A-type
suites.
Though
debatable,
we
infer
SW
block
be
a
continuation;
Semitau
shows
affinity
for
Cathaysia.
Both
terranes
would
accrete
onto
Indosinian
orogeny.
