Preliminary Results

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Preliminary Results

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DOSECC
Scientific Party
ICDP-OSG
LacCore
With funding from ICDP, U.S. NSF, and Swiss NSF
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Peten Lake District Peten, Guatemala
Guatemala
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Latitude 16o55N Longitude 89o50W Elevation 110
m Surface area 99.6 km2 Length gt20 km Width 3-4
km Max. depth 160 m
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Scientific Objectives
1. Paleoclimatic history of the northern lowland
Neotropics on decadal to millennial time scales
emphasizing marine-terrestrial linkages (e.g.,
Cariaco Basin, Greenland ice cores, etc.) 2.
Paleoecology and biogeography of the Maya
tropical lowland forest such as the response of
vegetation change to disturbance by humans,
climate change, and fire 3. Biogeochemical
cycling including integrated studies of
subsurface microbiology, geochemistry
(interstitial waters), and mineral
authigenesis/diagenesis
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Permitting (Jan 2-14)
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Arrival in Peten Mi casa es su casa (Jan 15)
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The waiting is the hardest part Lab
construction (Jan15-21)
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DIS/MSCL Laboratory
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Smear Slide/Pore Water Lab
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PISDP Propaganda
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No estamos perforando para el petróleo!
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Equipment arrives at Belize/Guat border (Jan 23)
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Platform is assembled
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Refrigerated container is offloaded (flirting
with disaster)
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Drilling Operations Begin Feb. 3. - March 13th
2006
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Drilling Summary
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Statistics of site drilled 7 Meters of
sediment recovered 1327 Metric tons of sediment
recovered 6.6 Deepest hole drilled 133.2
m MB of MSCL data 26 of photos taken 4860
of sandwiches eaten 980 of outboard boat
motors lost/destroyed 2 of dog bites requiring
rabies vaccination 1
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Drillsites N-S transect
w.d. 30 m Penetration 16.4 m
w.d. 46 m Penetration 133.2 m
w.d. 65 m Penetration 94.5 m
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Drillsites E-W transect
Site Pi-2
Site Pi-6
Site Pi-1
w.d. 54 m Pen. 66.5 m
w.d. 71 m Pen. 75.9 m
w.d. 65 m Pen. 94.5 m
Site Pi-3
w.d. 100 m Pen. 96.9 m
Site Pi-4
w.d. 150 m Pen. 67.4 m
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Some examples of lithologic variability
Some intervals are finely laminated (alternating
clay, organic matter and gypsum)
cm-scaled dark-light layering in deep sites
Gypsum crusts in a shallow site
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PI-3 wd100 m
PI-1 wd65.5 m
PI-2 wd52 m
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Hole B
Splice
Hole A
Site PI-2
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Density g/cm3
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100 m
Density g/cm3
65.5 m
Density g/cm3
Depth (mblf)
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Interstitial water chemistry
pH
Alkalinity
Site 3B
20
40
60
80
0
6.5
7.0
8.0
8.5
7.5
0
10
20
30
40
50
60
70
80
90
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• Lake Petén Itzá Drilling Project Initial Results
• All primary sites and one alternate site were
  drilled in water depths between 30 and 150 m with
  a total core recovery of 1327 m. The deepest site
  reached 133 m below lake floor.
• Triple coring at most sites resulted in complete
  recovery near real-time logging and splicing
  allowed verification of complete composite
  sections.
• ICDP-OSG group downhole-logged five of the seven
  sites.
• Lithologies, density and gamma logs show high
  degree of variability that, in some cases, is
  correlatable among sites.
• 1st splitting/description party - June 12-25 at
  LacCore.

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Participants
Abner Rodas, Adi Gilli, Alex Arrivillaga, Anders
Noren, Andy Mueller, Antoinette Luedin, Beau
Marshall, Bessie Oliva,Christian,Christina
Gallup,Cornelia Bronnimann, Dan Grossman, Daniel
Ariztegui, David Hodell, Dennis Nielson, Diana
Doug Prose, Doug Schnurrenberger, Dustin Grzesik,
Ed Brown, Emmanuel Chapron, Erin Endsley, Felix
Bussmann, Flavio Anselmetti, Florian Thevenon,
Franz Sperisen, Gabriella Alfaro,Gerald Islebe,
Jacobo Blijdenstein, Jaime Escobar, James Cramer,
Jason Curtis, Jochem Kueck, John Joice, Kent
Thomas, Kristina Brady, La Casa de Don David,
Lico Godoy, Liseth Perez, Luis Toruno, Margaret
Michael Dix, Mark Brenner, Mark Bush, Martin,
Melissa Orozco, Michial Strasser, Robert Hofmann,
Roland Blaser, Ryan Wilson, Silja Ramirez,
Stephanie Girardclos, Tony Ortiz,Valeria
Gamble,Vance Hiatt
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