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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. SPODDS SPECIAL FIELDTRIP NEW ZEALAND, 2010 Day 3 & 4. Content.

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SPODDS SPECIAL FIELDTRIP NEW ZEALAND, 2010 Day 3 & 4

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  1. 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 SPODDS SPECIAL FIELDTRIP NEW ZEALAND, 2010 Day 3 & 4

  2. Content • Map of the stops • Outcrops • Architecture • Stop description • Acknowledgements

  3. Map of the stops Lower Mt Messenger Formation

  4. Outcrops Mohakatino River North Jam Roll Potroz Section (won’t be visited) Rapanui Stream Tongaporutu River Inland section Waikiekie Stream

  5. Architecture Mohakatino Rv Jam Roll Packages in style of deposition Thin-bedded complex Siltstone package Potroz MTD Siltstone package Thick-bedded sandstones Scale 4m

  6. Stops description Lower Mt Messenger Formation: North • Mohakatino River • Jam Roll • Rapanui Stream • Tongaporutu River • 5. Inland section • 6. Waikiekie stream

  7. 1. Mohakatino River • Main 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 N Thick-bedded sandstone siltstone Bioturbated siltstone Thin bed of bioturbated sandstone Erosional contact between sandstone & siltstone

  8. 1. Mohakatino River • High density turbiduty currents • Energetic flows capable to erode • High rate of sedimentation • Small periods of time between flows

  9. 2. Jam Roll • Main lithofacies: • Mass Transport Deposits • Thick-bedded sandstones • Disturbed siltstone & mudstone deposits N Courtesy of Donald Lowe

  10. 2. Jam Roll MTD MTD Siltstone Thick-bedded sandstones • Key features: • Sliding blocks, soft sediment • deformation • Shearing surfaces • Active settings • Slope instabilities & failures

  11. 3. Rapanui Stream N • Siltstone dominated MTD • Main lithofacies: • Siltstone dominated MTD • Sandstone dominated MTD • Thick-bedded sandstones • Siltstone • Sandstone with thin mudstone beds Two different MTD brought together by fault Courtesy of Donald Lowe

  12. 3. Rapanui Stream • Sandstone dominated MTD

  13. 4. Tongaporutu River • Main lithofacies: • thick-bedded • amalgamated sandstone • thin-bedded siltstone • and sandstone • highly bioturbated • thick-bedded siltstone • mud-clast • conglomerates N

  14. 4. Tongaporutu River • Key features: • Overall upward fining cycle • compensational style • of deposition • Complete cycle of Deposition • Cross-stratification in thick- • bedded sandstones FinninngUpward

  15. 5. Inland section N

  16. 6. Waikiekie stream • Main lithofacies: • thick-bedded sandstones • thin-bedded siltstone • and sandstone • highly bioturbated • siltstone packages • mud-clast conglomerates • siltstone dominated MTD N • Key features: • Nested channels • Highly energetic flows • Transition between lower and • Upper Mt. Messenger Fm. Channels

  17. 6. Waikiekie stream Rotated blocks Channel

  18. Acknowledgements SPODDS Students:Jon Rotzien, Lisa Stright . Zane Jobe, Katie Maier, Julie Fosdick, Anne Bernhardt,Glenn Sharman, Blair Burgreen, Geological and Nuclear Sciences (GNS) in New Zealand

  19. Thank you for your attention! New Zealand, 2009

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