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Tectonic and paleoclimatic significance of Quaternary to Holocene-aged river terraces of the Waipaoa Catchment, east coast, North Island, New Zealand. MICHAEL MARDEN , Landcare Research P rivate Bag 445 Gisborne, New Zealand email: mardenm @landcareresearch.co.nz

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  1. Tectonic and paleoclimatic significance of Quaternary to Holocene-aged river terraces of the Waipaoa Catchment, east coast, North Island, New Zealand. MICHAEL MARDEN, Landcare ResearchPrivate Bag 445 Gisborne, New Zealandemail: mardenm @landcareresearch.co.nz KELVIN BERRYMAN, Institute of Geological & Nuclear SciencesP. O. Box 30 368Lower Hutt, New Zealand.email: k.berryman@gns.cri.nz ALAN PALMER, Institute of Natural ResourcesCollege of SciencesMassey University,Palmerston North, New Zealand. email: A.S.Palmer@massey.ac.nz COLIN MAZENGARB, Mineral Resources Tasmania PO Box 56, Rosny Park Tasmania, Australia. email: cmazen@mrt.tas.gov.au

  2. Symbol Base Tephra Age Quat. undifferentiated Qun Rotoehu 110 000+ Waipaoa 4 W4 Rotoehu 90 000 - 110 000 Waipaoa 3 WRe Rotoehu c.50 - 60000 Waipaoa 2a WMn Mangaone c. 33 000 Waipaoa 2 WOm Omateroa 28 220 ±630 Waipaoa 1b WKk Kawakawa 22590 ±230 Waipaoa 1a WOk Okareka c. 18 000 Waipaoa 1 Wrk Rerewhakaaitu 14700 ±110 Holocene 8 HWh Waiohau 118500 ±60 Holocene 7 HKp Karapiti 9820 ±80 Holocene 6 HRm Rotoma 8530 ±10 Holocene 5 HMa Mamuka 7250 ±20 Holocene 4 HWk Whakatane 4830 ±20 Holocene3 HWm Waimihia 3280 ±20 Holocene 2 HTp Taupo 1850 ±10 Holocene 1 HKa Kaharoa 770 ±20 Hun Holocene undifferentiated

  3. Big Picture Scenario • Construct sediment budget for the Waipaoa basin for specific time periods as constrained by dated terraces spanning the last 100ka • Establish differences in mechanism drivers, scale and timing of periods of slope adjustment due to river incision across subcatchments within Waipaoa basin

  4. Reliant on Good Databases • Improve knowledge of terrace ages through tephra analyses and GPS especially in tributary catchments • Intensify work on Holocene terraces • Establish timing of major periods of sedimentation and storage volumes in tributary valley floors • Improve knowledge of subsurface geometry of tributary streams and the main stem of the Waipaoa

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