De
tri
tal SHRIMP U–Pb
resul
ts f
rom fou
r samples of me
tasedimen
t show
tha
t the Jack Hills me
tasedimen
ta
ry bel
t, Na
rrye
r te
rrane, Yilga
rn c
ra
ton, Wes
te
rn Aus
tralia con
tains
two li
thologically simila
r siliciclas
tic associa
tions wi
th disc
re
te age
and sou
rce cha
rac
te
ris
tics. An olde
r associa
tion only con
tains zi
rcons wi
th ages g
rea
te
r than 3000 Ma
and p
robably accumula
ted p
rio
r to 2700 Ma. G
rains in
the
range 3600–3000 Ma a
re likely de
rived f
rom g
rani
tic gneisses su
rrounding
the me
tasedimen
ta
ry bel
t. The olde
r associa
tion was in pa
rt sou
rced f
rom,
and likely accumula
ted on, gneisses of
the Na
rrye
r te
rrane, howeve
r,
the sou
rce of
the oldes
t (>4000 Ma) g
rains is unknown. The younge
r associa
tion con
tains zi
rcons wi
th
the bulk of
the ages be
tween 2800
and 2600 Ma,
and de
tri
tal g
rains as young as 1800 Ma. I
t also shows ages in
the
range 3600–3000 Ma
and a few g
rains as old as 4100 Ma. The younge
r associa
tion has a significan
t con
tribu
tion of zi
rcons de
rived f
rom Yilga
rn c
ra
ton
and Cap
rico
rn o
rogen
and was deposi
ted af
te
r rc=""h
ttp://www.sciencedi
rec
t.com/scidi
rimg/en
ti
ties/223c.gif"" al
t=""no
t, ve
rt, simila
r"" bo
rde
r=0>1800 Ma, possibly in a fo
rel
and basin se
tting close
to
the olde
r associa
tion wi
th
the
two
then
tec
tonically in
te
rleaved.