Presentation on theme: "PASADO: Potrok Aike maar lake Sediment Archive Drilling project."— Presentation transcript:
1PASADO:Potrok Aike maar lakeSediment Archive Drilling project
2Bernd Zolitschka, Flavio Anselmetti, Daniel Ariztegui, Laguna Potrok Aike (southern Patagonia, Argentina) the site of the ICDP lake drilling projectBernd Zolitschka, Flavio Anselmetti, Daniel Ariztegui,Hugo Corbella, Pierre Francus, Andreas Lücke, Nora Maidana, Christian Ohlendorf, Frank Schäbitz, Stefan Wastegard+ logo Pierre, stefan
7Hydrological variability LANDSAT 7, BANDAS 5,4,1 DEL 04/10/99Landsat images from E. Mazzoni et al.LANDSAT 7, BANDAS 5,4,1 DEL 26/09/02Precipitation: 325,6 mmHydrologically sensitive areaPTA = only permanent lakeTopography = very flatPrecipitation: mmINTA meteo station
8Lake level changes Glacial? overflow: 21 m above PDLL Little Ice Age: PDLL: present day lake levelLake level changes21 m8.7 – 7.3 cal. BP:35 m below PDLL8.8 m0 m = PDLL-35 mOverflow at +21m above PDLLMore indications, that this lake is hydrologically sensitiveAnselmetti et al., 2009(Sedimentology)
9Laguna Potrok Aike is hydrologically sensitive Seismic (3.5 kHz) and sedimentological evidence of a lake level low stand, i.e. a hydrological extreme event, at the submerged -35 m lake level terrace7300 cal. BP44,800 BPDocumentation for unconformity at the lake shoulder and ist timingAnselmetti et al., 2009 (Sedimentology)
10Observed hydrological variations YearLake level changesEvidencesAD 2006Reference levelMeasurementsAD 20023,5 m lowerMeasurementsLittle Ice Age(19th century)9,0 m higherDated lake level terrace~7300 cal. BP36,8 m lowerDated submerged lake level terracePre-Holocene21 m higherHighest lake level terrace; geomorphological evidence of an outflow;sedimentological evidence of a non-end-lake situation
13GLAD800 Deep drillingRecovering sediments of up to several hundred meters was scheduled for September to November 2008
14Time frame of PASADO in perspective PTADome CVostokMarine record200400600800Age (ka BP)EPICA community members, 2004
15Potrok Aike maar lake Sediment Archive Drilling project (PASADO) International fundingPotrok Aike maar lake Sediment Archive Drilling project (PASADO)is funded by:is co-funded by:
16Development of a maarSchematic structure of the Tertiary Messel Maar (Germany) with:lacustrine sedimentsvolcano-clastic sedimentsdiatreme brecciabasaltic ventFelder & Harms 2004
17Comparison of Messel with Laguna Potrok Aike N-S seismic reflection profilePirrung et al., 2003Schulze et al., 2005Gebhardt et al., subm.
18PASADO has two priorities Focus A:1. Lithosphere dynamics2. Volcanic systemsInvestigation of the Cenozoic back arc volcanism, phreatomagmatic formation and analysis of early sedimentation in a young maar diatreme and its volcanic history.Focus B:1. Earth history2. Global environment3. Climate change
19Focus BClimate reconstruction spanning several glacial cycles (the last 770 ka) based onMonitoring approach to understand and quantify links between climatic and environmental forcing on the sedimentary record.Multi-proxy approach combining different proxy parameters for quantitative climate reconstruction.Modelling approach applying model-proxy intercomparisons to understand and quantify climatic processes and the links between climate variability and climatic forcing.Inter-archive approach to link this lacustrine record with South Atlantic marine sediment records and with Antarctic ice cores.
20The potential of Laguna Potrok Aike prior to drillingGLAD-8001 m~400 m19 m~600 mlast millenniumlast 16,000 yearsDiatreme flankdiatreme-bedrocktransitionlast glacial cycles+diatreme brecciaAnselmetti et al., 2009 (Sedimentology)
21New techniques need to be applied and international scientific cooperation as well as funding is necessary to recover more than the intended 450 m of lacustrine sediments from 100 m deep Laguna Potrok Aike.This calls into action:&To achieve these goals, …Drilling, Observation andSampling of the Earth’sContinental CrustInternational Continental Scientific Drilling Program
22The active PIs of PASADO PASADO workshop 2006 Bernd Zolitschka1, GERFlavio Anselmetti, CHDaniel Ariztegui2, CHHugo Corbella4, ARGPierre Francus, CANAndreas Lücke6, GERNora Maidana7, ARGChristian Ohlendorf8, GERFrank Schäbitz9, GERStefan Wastegard10, SWE8104Missing on thisgroup photo are:FlavioAnselmettiandPierreFrancus69271
23PASADO project design Completed in 2008 Ongoing, completed in 2009 Started in June 2009To come in 2010 and laterOngoing
24Reality: Report about the field work in 2008 and first data
25Mobilisation: Only after two weeks of delay trucks were able to drive to Laguna Potrok Aike…
29Trucks, winches, crane, forklift: most welcome help during the process of launching
30With a delay of one month the platform was operational
31Drilling was carried out at these sites Due to this delay of one month we cancelled the first site at the 35 m lake level terraces completely and started with drilling in the center of the lake at almost 100 m of water depth.
32Almost exclusively the Hydraulic Piston Corer (HPC) was used…
33… to recover 533 m of sediments with a mean recovery rate of 94.3 %.
34MSCL at work in the field laboratory MSCL analyzed only magnetic susceptibility. Gamma ray density (GRAPE) could not be measured because we were not able to import the gamma ray source into Argentina. Measurements are currently redone with the gamma ray source at the Alfred-Wegener-Institute in Bremerhaven to obtain this data set for physical properties. It provides information about density, porosity, water content and grain sizes.MSCL at work in the field laboratory
37Distress at lakeDuring a heavy storm anchors did not hold and the platform was drifting towards the eastern shore with two of DOSECC staff and two downhole loggers onboard.
38Drilling summary Drilling time applied for: 60 days Potential drilling time on the lake: 34 daysActual drilling days: 12Weather-related downtime: 16 daysDowntime for technical reasons: 6 daysTotal hole depth applied for: 1850 mRealised total hole depth: 533 mDrilling time applied for: 60 daysPotential drilling time on the lake: 34 daysTotal hole depth applied for: 1850 mRealised total hole depth: 533 mDrilling time applied for: 60 daysTotal hole depth applied for: 1850
39What we have achieved after field work was over… GLAD-8001 m19 m100 mlast millenniumlast 16,000 yearsDiatreme flank… is the longest lake record for South America south of the tropics!!!last ≈100,000 yearsAnselmetti et al., 2009 (Sedimentology)
40Ultimate goals of PASADO: well dated multi-proxy quantitative climate reconstructions in combination with a climate-model intercomparisonSeveral „absolute“ dating methods (AMS 14C, Ar/Ar, OSL) will be applied in combination with stratigraphic „dating“ methods (tephra, pollen, paleomagnetic intensity) multiple dating approachQuantitative climate reconstructions:First results are available for pollen transfer functionsEstablishment of training sets is ongoing for chironomid and diatom transfer functionsTests have been successfully carried out for biomarker (TEX86)Proxy-model intercomparisons evaluated proxy-based hypotheses with GCM climate simulations applying regional climate modelling
41Scientific goalsCore opening started in March 2009 and will continue throuhghout the year. Based on a precise chronology we will obtain data and reconstructions about:Microbial activity (deep biosphere)Provenance of organic and minerogenic sedimentsVolcanic activityDust storm frequencyOccurrences of natural firesVariations of the Earth‘s magnetic fieldEvolution of the lacustrine ecosystemWater balanceQuantitative and qualitative climate parametersTemporal and regional variability of Southern Hemispheric Westerlies
42Information about PASADO is available in the world wide web PASADO project homepage:ICDP homepage:or
43Merci beaucoup! Muchísimas gracias! Thank you for your attention! Vielen Dank!Coring conditionsMerci beaucoup! Muchísimas gracias! Thank you for your attention!
44Merci beaucoup! Muchísimas gracias! Thank you for your attention! Vielen Dank!Merci beaucoup! Muchísimas gracias! Thank you for your attention!