Tectonics a ff - GeoPRISMSgeoprisms.org › ... › 2015 › 01 ›...
Transcript of Tectonics a ff - GeoPRISMSgeoprisms.org › ... › 2015 › 01 ›...
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Tectonics affects sedimentation; sedimentation affects tectonics
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Why do subduction inputs matter?
! Stratigraphic partitioning at décollement interval!! imbricate thrusts/folds, splay faults, thrust vergence!
! Sandy turbidite intervals above/below décollement!! diffuse/focused drainage, pore pressure, critical taper!
! Detrital clay mineral assemblages above/below décollement interval !! friction, fault-slip behavior (SSE)!
! Diagenesis and fluid production above/below décollement interval !! pore pressure, effective stress!
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Saffer & Bekins (2002) Geology
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Thermal models from: Harris et al. (2011) G-Cubed
(Saffer, Harris, Underwood, 2012 AGU)
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(Saffer, Harris, Underwood, 2012 AGU)
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IODP 322-C0011AIODP 322-C0012B
ODP 190-1173
ODP 190-1178
ODP 190-1175
ODP 131-808 ODP 190-1177
ODP 190-1177
DSDP 31-297
DSDP 31-298
DSDP 87-582DSDP 87-583 Muroto
Ashizuri
Kumano
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Note that Kuroshio Current intensified ~3 Ma Isthmus of Panama closed Stronger subtropical gyre
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Mount Fuji
Izu Peninsula
Suruga Trough
Sagami Trough
Yoshikawa & Nemoto (2010) Marine Geology
Fuji River
Izu- Bonin arc
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Yoshikawa & Nemoto (2010) Marine Geology
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Kumano Basin
Muroto Basin
Shiono-misaki Canyon
Tenryu Canyon
Kashinosaki Knoll
Kinan Seamounts
Shikoku Basin
Suruga Trough
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Inputs to Ashizuri transect!
Smooth basement;!turbidites subducted!
Site
1177
De
pth
(m
ete
rs b
elo
w s
ea
flo
or)
NW SE
0
500
600
700
800
400
300
200
100
400
500
600
700
800
300
hemipelagic/
pyroclastic
facies
hemipelagic
facies
siliciclastic
turbidite
facies
volcaniclastic
facies
basalt basement
wa
sh
do
wn
to
30
0 m
bsf
SITE 1177
Depth
(m
ete
rs b
elo
w s
eafloor)
Décollement propagates just above turbidite facies!
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Inputs to Muroto transect!
Basement high along Kinan seamount chain;!no turbidites subducted!
Décollement propagates within hemipelagic facies!
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Stratigraphic correlation from Muroto to Ashizuri!
Base of hemipelagic/pyroclastic facies (USB) at 3.3 to 3.9 Ma!
Age of décollement zone = !3.8-5.3 Ma!5.0-6.3 Ma!
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Site NT2-11B Site C0002 Site C0001
Sites C0003-C0005, Site C0008Sites C0006-C0007 Site NT1-07A Site NT1-01A
0 10
km
De
pth
(km
)
2
4
6
8
10
Kashinosaki Knoll
Site C0011! Site C0012!
Seismogenic Zone Experiment: Which units subduct to up-dip limit?!
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Base of hanging wall =!5.32 Ma;!oldest USB = 7.6 to 7.8 Ma!
Underwood & Moore (2012)
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Kumano transect (NanTroSEIZE)!
Miocene turbidites in lower Shikoku Basin are subducted
IODP Expeditions 322, 333 & 338
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Underwood & Guo (in press)
Clay mineral assemblages change during late Miocene!
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Unusually high content of smectite – important for fluid production and pore pressure as strata move toward up-dip limit of seismogenic zone
Underwood & Guo (in press)
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Modulation of clay minerals
! Parent rocks in source areas!! Climate and topography!! Volcanism!! Prevailing wind direction!! Surface/bottom currents!! Bathymetry => gravity flows!! Early diagenesis (volc. glass => smectite)!
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Kimura et al. (2005) GSA Bulletin
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Anomalous near-trench volcanism Abundant detrital smectite Volcanic/mixed turbidites into Shikoku Basin
Formation of basement high (Kashinosaki Knoll) near back-arc ridge axis (Kinan seamounts)
After: Kimura et al. (2005) – GSA Bulletin
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Cessation of near-trench volcanism Progressive erosion of plutons and accretionary prism
Explosive arc volcanism => abundant air-fall ash layers Detrital clay => illite + chlorite
After: Kimura et al. (2005) – GSA Bulletin
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Influences on sand bodies
! Parent rocks in source areas!! Climate and topography!! Volcanism!! Bathymetry => gravity flows!! Incision of submarine canyons!! Sea level!! Basement relief (seamounts)!! Prism architecture (upslope trapping)!
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Correlation of lithostratigraphy between Sites C0011 and C0012!
Base of hemipelagic/pyroclastic facies (USB) at 7.6-7.8 Ma!
Projection of décollement zone ~5.3 Ma)!
Kyushu fan
Zenisu fan
Note that sand bodies extend to crest of Kashinosaki Knoll
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1 km
Channel
Daini Zenisu fanDaiichi Zenisu fan 500 m
C0011
1000 m
Kyushu Fan
Daini Zenisu fan
Daiichi Zenisu fan
2 km
Lobes
C0011 C0012
Dep
th fr
om M
SL (k
m)
4
6
8
10
12
0 2 4 6 8 10kmAccretionary prism
Trench-wedge
Zenisu fansKyushu Fan
Oceanic basement
Seafloor
NNW SSE
C0011 C0012
0 2 4 6 8 10km
Kashinosaki Knoll
350
400
450
mbsf
(A)
(B)
(C)
(D)
Channel
Channel
Site C0011: Unit II Daiichi Zenisu fan
Zenisu fan lower = channeled, mixed provenance upper = sheets, volc. provenance
Pickering et al. (in press) G-cubed
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Pickering et al. (in press) G-cubed
Zenisu
Kyushu
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Plio-Pleistocene!Kazusa Group!Boso Peninsula!(forearc basin)!
Pickering et al. (1999) J. Geol. Soc. London
Model for comparison to Kumano forearc basin
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Pickering et al. (in press) G-cubed
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Monterey canyon/fan!
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Pickering et al. (in press) G-cubed
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Lessons learned from Nankai:
! Three drilling transects, five decades!! Ashizuri!
! DSDP Legs 31, 87 !! ODP Leg 190!
! Muroto!! ODP Legs 131, 190, 196!
! Kumano!! IODP Expeditions 314, 315, 316, 319, 338 (prism, forearc)!! IODP Expeditions 322, 333, 338 (inputs)!! IODP Expedition 348 (scheduled => deep prism)!! IODP Expedition 3xx (planned => megasplay)!
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Lessons learned from Nankai: ! Facies boundaries are time-transgressive!! Facies units are not continuous along strike!! Turbidites are subducted at frontal decollement!! Sand influx/deposition were influenced by:!
! Basement topography in Shikoku Basin!! Reorganizations of plate boundary, arc collision!! Incision of submarine canyons!! Eustatic lowstands!
! Clay mineral assemblages were influence by:!! Anomalous near-trench volcanism!! Progressive unroofing of plutons, accreted sediments!! Temporal changes in ocean water circulation!
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So, what does this mean for planning Hikurangi science?!
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Hikurangi Plateau
Davy et al. (2008) G-Cubed
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Mountjoy et al.!(2009)!Mar. Geol.!
Cook Strait
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Hikurangi channel
Lewis et al. (1998) Basin Research
Lewis & Pantin (2002) Marine Geol.
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Pouderoux et al. (2012)!Marine Geology!
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Transverse inputs:!Fewer turbidity currents with rising S.L. !
Pouderoux et al. (2012)!Marine Geology!
Poverty re-entrant!
Ruatoria re-entrant!
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Hawke Bay forearc basin
Detailed stratigraphic architecture!History of last 1.1 Myr!11 depositional sequences!Strat. ties to onshore + wells!Retrogradational trend!Arcward migration of depocenter!Out-of-sequence thrust!Eustatic S.L., O-isotopes!
Paquet et al. (2011) GSA Bull.
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What next? A strawman:
! Holistic 3-D assessment of entire regional system!! Source (shelf, canyons) to sink (Hikurangi Trough)!! Provenance, dispersal paths!! Facies, sand body geometry, submarine slides!
! Discriminate between transverse/axial delivery!! Quantify sediment composition (clay + sand)!! Document cycles/timing of climate/eustasy!! Verify timing of major shifts in sedimentation rate!
! Canyon incision, onset of Pleistocene glaciation?!! Drill/core to basement of Hikurangi Plateau !
! Host rocks for SSE!