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PASADO: Potrok Aike maar lake Sediment Archive Drilling project.

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Presentation on theme: "PASADO: Potrok Aike maar lake Sediment Archive Drilling project."— Presentation transcript:

1 PASADO: Potrok Aike maar lake Sediment Archive Drilling project

2 Laguna Potrok Aike (southern Patagonia, Argentina) the site of the ICDP lake drilling project Bernd Zolitschka, Flavio Anselmetti, Daniel Ariztegui, Hugo Corbella, Pierre Francus, Andreas Lücke, Nora Maidana, Christian Ohlendorf, Frank Schäbitz, Stefan Wastegard

3 Southern Hemisphere LGM PTA Laguna Potrok Aike ( PTA) is climatically influenced by: El Nino Southern Oscillation (ENSO) Antarctic Oscillation (Polar Easterlies) Southern Hemispheric Westerlies

4 Lago Argentino Lago Cardiel Southern Patagonia Lago Viedma Crater lakes of the Pali Aike Volcanic Field Southern Patagonia South America

5 Volcanological map of the Pali Aike Volcanic Field Zolitschka et al., 2006 (Scientific Drilling) Laguna Potrok Aike Age of the backarc volcanism: Pliocene to Holocene ( Ma)

6 Laguna Potrok Aike

7 LANDSAT 7, BANDAS 5,4,1 DEL 04/10/99 Landsat images from E. Mazzoni et al. Precipitation: mm LANDSAT 7, BANDAS 5,4,1 DEL 26/09/02 Precipitation: 325,6 mm Hydrological variability INTA meteo station

8 Lake level changes 21 m 8.8 m 0 m = PDLL -35 m Glacial? overflow: 21 m above PDLL Little Ice Age: 8.8 m above PDLL PDLL: present day lake level 8.7 – 7.3 cal. BP: 35 m below PDLL Anselmetti et al., 2009 (Sedimentology)

9 Laguna 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 terrace 7300 cal. BP 44,800 BP Anselmetti et al., 2009 (Sedimentology)

10 Highest lake level terrace; geomorphological evidence of an outflow; sedimentological evidence of a non-end-lake situation 21 m higherPre-Holocene Dated submerged lake level terrace 36,8 m lower~7300 cal. BP Dated lake level terrace9,0 m higherLittle Ice Age (19 th century) Measurements3,5 m lowerAD 2002 MeasurementsReference levelAD 2006 EvidencesLake level changesYear Observed hydrological variations

11 Laguna Potrok Aike

12 Our vision

13 Recovering sediments of up to several hundred meters was scheduled for September to November 2008 GLAD800 Deep drilling

14 Time frame of PASADO in perspective Age (ka BP) EPICA community members, 2004 PTA Dome C Marine record Vostok

15 Potrok Aike maar lake Sediment Archive Drilling project (PASADO) is funded by: is co-funded by: International funding

16 Felder & Harms 2004 Schematic structure of the Tertiary Messel M aar (Germany) with: lacustrine sediments volcano-clastic sediments diatreme breccia basaltic vent Development of a maar

17 Comparison of Messel with Laguna Potrok Aike Pirrung et al., 2003 Schulze et al., 2005 Gebhardt et al., subm. N-S seismic reflection profile

18 Focus B: 1. Earth history 2. Global environment 3. Climate change PASADO has two priorities Focus A: 1. Lithosphere dynamics 2. Volcanic systems Investigation of the Cenozoic back arc volcanism, phreatomagmatic formation and analysis of early sedimentation in a young maar diatreme and its volcanic history.

19 Climate reconstruction spanning several glacial cycles (the last 770 ka) based on 1.Monitoring approach to understand and quantify links between climatic and environmental forcing on the sedimentary record. 2.Multi-proxy approach combining different proxy parameters for quantitative climate reconstruction. 3.Modelling approach applying model-proxy intercomparisons to understand and quantify climatic processes and the links between climate variability and climatic forcing. 4.Inter-archive approach to link this lacustrine record with South Atlantic marine sediment records and with Antarctic ice cores. Focus B

20 ~600 m The potential of Laguna Potrok Aike prior to drilling 19 m 1 m last 16,000 years last glacial cycles + diatreme breccia GLAD-800 diatreme- bedrock transition last millennium Diatreme flank ~400 m Anselmetti et al., 2009 (Sedimentology)

21 New 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: Drilling, Observation and Sampling of the Earths Continental Crust International Continental Scientific Drilling Program &

22 The active PIs of PASADO PASADO workshop 2006 Bernd Zolitschka 1, GER Flavio Anselmetti, CH Daniel Ariztegui 2, CH Hugo Corbella 4, ARG Pierre Francus, CAN Missing on this group photo are: Flavio Anselmetti and Pierre Francus Andreas Lücke 6, GER Nora Maidana 7, ARG Christian Ohlendorf 8, GER Frank Schäbitz 9, GER Stefan Wastegard 10, SWE

23 PASADO project design Completed in 2008 To come in 2010 and later Started in June 2009 Ongoing, completed in 2009 Ongoing

24 Reality: Report about the field work in 2008 and first data

25 Mobilisation: Only after two weeks of delay trucks were able to drive to Laguna Potrok Aike…

26 … and finally were unloaded near the lake!

27 In the meantime the camp* was set up *Potrok City

28 The Launcher almost ready to go!

29 Trucks, winches, crane, forklift: most welcome help during the process of launching

30 With a delay of one month the platform was operational

31 Drilling was carried out at these sites

32 Almost exclusively the Hydraulic Piston Corer (HPC) was used…

33 … to recover 533 m of sediments with a mean recovery rate of 94.3 %.

34 MSCL at work in the field laboratory

35 Sedimentology section of the field laboratory

36 Pore water sampling in the field laboratory

37 Distress at lake

38 Drilling summary Drilling time applied for: 60 days Potential drilling time on the lake: 34 days Total hole depth applied for: 1850 m Realised total hole depth: 533 m Drilling time applied for: 60 days Total hole depth applied for: 1850 Drilling time applied for: 60 days Potential drilling time on the lake: 34 days –Actual drilling days: 12 –Weather-related downtime: 16 days –Downtime for technical reasons: 6 days Total hole depth applied for: 1850 m Realised total hole depth: 533 m

39 100 m What we have achieved after field work was over… 19 m 1 m last 16,000 years last 100,000 years GLAD-800 last millennium Diatreme flank Anselmetti et al., 2009 (Sedimentology)

40 Ultimate goals of PASADO Ultimate goals of PASADO: well dated multi-proxy quantitative climate reconstructions in combination with a climate-model intercomparison Several absolute dating methods (AMS 14 C, Ar/Ar, OSL) will be applied in combination with stratigraphic dating methods (tephra, pollen, paleomagnetic intensity) multiple dating approach Quantitative climate reconstructions: –First results are available for pollen transfer functions –Establishment of training sets is ongoing for chironomid and diatom transfer functions –Tests have been successfully carried out for biomarker (TEX 86 ) Proxy-model intercomparisons evaluated proxy-based hypotheses with GCM climate simulations applying regional climate modelling

41 Scientific goals Microbial activity (deep biosphere) Provenance of organic and minerogenic sediments Volcanic activity Dust storm frequency Occurrences of natural fires Variations of the Earths magnetic field Evolution of the lacustrine ecosystem Water balance Quantitative and qualitative climate parameters Temporal and regional variability of Southern Hemispheric Westerlies Core opening started in March 2009 and will continue throuhghout the year. Based on a precise chronology we will obtain data and reconstructions about:

42 Information about PASADO is available in the world wide web PASADO project homepage: ICDP homepage: or

43 Coring conditions Vielen Dank! Merci beaucoup! Muchísimas gracias! Thank you for your attention!

44 Vielen Dank!

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