SPODDS SPECIAL FIELDTRIP NEW ZEALAND, 2010
Day 3 & 4
Stanford Project on Deepwater Depositional Systems
DEEPWATER DEPOSITS OF THE LOWER MOUNT MESSENGER FORMATION, UPPER MIOCENE,
TARANAKI BASIN
Presented By:
Larisa U. Masalimova Research Advisor:
Donald R. Lowe
Content
• Map of the stops• Outcrops• Architecture• Stop description• Acknowledgements
Map of the stopsLower Mt Messenger Formation
OutcropsMohakatino River
Jam Roll
Rapanui Stream
Tongaporutu River
Potroz Section(won’t be visited)
Waikiekie Stream
Inland section
North
ArchitectureMohakatino Rv Jam Roll
Potroz
Packages in style of depositionThin-bedded complex
Thick-bedded sandstones
MTD
Siltstone package
Siltstone package
4mScale
1. Mohakatino River2. Jam Roll3. Rapanui Stream4. Tongaporutu River5. Inland section6. Waikiekie stream
Stops description
North
Lower Mt Messenger Formation:
1. Mohakatino RiverMain lithofacies:
•Thick-bedded sandstone (S3- Ta), thickness 50 cm to 3 m• Sandstone with plane lamination (Tb) and ripples (Tc)•Thick bioturbated siltstone package with thin ash layers and thin sandstone beds•Thin mud layers (Te) •MTD
Bioturbated siltstone Thin bed of bioturbated sandstone
siltstone
Thick-bedded sandstone
Erosional contact between sandstone & siltstone
N
1. Mohakatino River
• High density turbiduty currents• Energetic flows capable to erode• High rate of sedimentation• Small periods of time between flows
2. Jam Roll
deposits
Main lithofacies: •Mass Transport Deposits•Thick-bedded sandstones•Disturbed siltstone & mudstone
N
Courtesy of Donald Lowe
2. Jam Roll
Siltstone
MTD MTD
Thick-bedded sandstonesKey features:•Sliding blocks, soft sedimentdeformation•Shearing surfaces•Active settings•Slope instabilities & failures
3. Rapanui Stream
Main lithofacies: •Siltstone dominated MTD•Sandstone dominated MTD•Thick-bedded sandstones•Siltstone •Sandstone with thin mudstone beds
Two different MTD broughttogether by fault
Siltstone dominated MTDN
Courtesy of Donald Lowe
3. Rapanui Stream
Sandstone dominated MTD
4. Tongaporutu RiverMain lithofacies:• thick-bedded amalgamated
sandstone• thin-bedded siltstone and sandstone • highly bioturbated thick-bedded siltstone• mud-clast conglomerates
N
4. Tongaporutu River
Finninng Upward
Cross-stratification in thick-bedded sandstones
Key features:•Overall upward fining cycle•compensational style of deposition•Complete cycle of Deposition
5. Inland section
N
6. Waikiekie stream
Channels
Main lithofacies:• thick-bedded sandstones• thin-bedded siltstone and sandstone • highly bioturbated siltstone packages• mud-clast conglomerates•siltstone dominated MTD
Key features:Nested channelsHighly energetic flowsTransition between lower
andUpper Mt. Messenger
Fm.
N
6. Waikiekie streamRotated blocks
Channel
18
SPODDS Students:Jon Rotzien, Lisa Stright .Zane Jobe, Katie Maier, Julie Fosdick,
Anne Bernhardt,Glenn Sharman, Blair Burgreen,
Acknowledgements
Geological and Nuclear Sciences (GNS) in New Zealand
Thank you for your attention!
New Zealand, 2009