rio grande rise
TRANSCRIPT
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Seabed Mapping - Marine Geology Cooperation
Roberto Ventura Santos Director of Geology and Mineral Resources (DGM)
Ivo Pessanha
Head of Marine Geology Division (DIGEOM)
High Level Meeting EU - Brazil Atlantic Ocean Research Cooperation
Rio de Janeiro, November, 2015
Geological Survey
of Brazil - CPRM
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Marine Geology Programme
• Mineral Potential Assessment of the Brazilian Continental Shelf (REMPLAC).
• Prospecting and Exploration of Mineral Resources of the International Area in the South and Equatorial Atlantic (PROAREA).
Geological Survey of Brazil - CPRM
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Geological Survey of Brazil - CPRM
Start
Finish
Movement
DIVISION OF MARINE GEOLOGY 1.The Brazilian Shallow Platform 2.Jequitinhonha Project 3.Mid-Atlantic Ridge Project – PROCORDILHEIRA 4.Rio Grande Rise Project – PROERG
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Geological Survey of Brazil - CPRM
Levantamento Regional:
60 km
200 km
• MBES/backscatter
• Water Column
• Gravimetry
• Magnetometry
• SBP (Sísmica rasa)
• CTD
• Water Samples
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Geological Survey of Brazil - CPRM
Water Samples - Mid-Atlantic Ridge
Sub-sampling of the water samples were done as follows:
1) Aliquots were sampled in gas tight glass bulbs for CH4 analyses.
2) Aliquots were sampled into acid washed Nalgene bottles for Mn analyses.
3) Aliquots were sampled into Nalgene bottles for pH, CO2 and total alkalinity the one hand and for SiO2 analyses and
archiving.
Sampling for CH4 in glas bulbs
R/V Ocean Stalwart
Sampling in Nalgene - pH,CO2, SiO2
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20
4 k
m
SEGMENTO 11
x
?
?
Geological Survey of Brazil - CPRM
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Regional Survey
CTD/Rosette
Station
CTD/Rosette
Station
Geological Survey of Brazil - CPRM
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ProCordilheira – Summary in numbers
2011 - 2013
• MBES/backscatter 90.000 km²
• SBP 12.000 km linear
• Gravimetry 15.000 km linear
• Magnetometry 12.000 km linear
• CTD 71 stations
• Water samples 1600
• Chemical analysis 3.500
Geological Survey of Brazil - CPRM
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March 2013
COLMEIA COLd Mantle Exhumation and Intra-transform Accretion
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March 2013
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March 2013
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March 2013
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Geological Survey of Brazil - CPRM
Start
Finish
Movement
PROJECTS OF THE DIVISION OF MARINE GEOLOGY 1.The Brazilian Shallow Platform 2.Jequitinhonha Project 3. Mid-Atlantic Ridge Project – PROCORDILHEIRA 4. Rio Grande Rise Project – PROERG
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General Map - Rio Grande Rise - São Paulo Ridge
Geological Survey of Brazil - CPRM
Rio Grande Rise São Paulo Ridge
~1500km
• MBES/Backscatter • Gravimetry • Magnetometry • CDT • Dredging
Data on the Rio Grande Rise
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Geological Survey of Brazil - CPRM
Start
Finish
Movement
R/V Sirius 2009/2010 R/V Marion Dufresne 2011
R/V Fugro Gauss 2011/2012 R/V Yokuska 2013
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Start
Finish
Movement
Dredging in the Rio Grande Rise
Geological Survey of Brazil - CPRM
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Start
Finish
Movement
Spot Sampler - TV GRAB
Geological Survey of Brazil - CPRM
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Start
Finish
Movement
Core Sampler - Jumbo Piston Core
Geological Survey of Brazil - CPRM
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Start
Finish
Movement
Rock Samples on Board Ship
Geological Survey of Brazil - CPRM
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Bathymetric Map - Rio Grande Rise - Alpha Area
Geological Survey of Brazil - CPRM
Pockmaks
Width ~30km
Length ~400km
Probaly caused escape gas??
Area: ~50,000km²
Mud Volcano
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Geological Survey of Brazil - CPRM
Backscattering survey
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Geological Survey of Brazil - CPRM
3D View - Rio Grande Rise - Pockmarks
Sediment
Rock
Pockmarks
Width ~30km
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Geological Survey of Brazil - CPRM
Cobalt-Rich
Ferromanganese Crusts
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Geological Survey of Brazil - CPRM
Alpha
Bravo
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Geological Survey of Brazil - CPRM
Biotite
gnaisse
Granite Pegmatite
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ProERG - Summary in numbers
2009 - 2010 (Brazilian Navy Partnership)
• MBES/backscatter 46.220 km²
2011 - 2013
• MBES/backscatter 84.123 km²
• SBP 9.288 km linear
• Gravimetry 9.288 km linear
• Magnetometry 9.288 km linear
• CTD 31 stations
• Geological samples 137 drag profiles (15 tons)
• Seabed video record 15 profiles
• Jumbo piston core 4 with recovery of up to 50 m
Geological Survey of Brazil - CPRM
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Geological Survey of Brazil - CPRM
Submersible Shinkai 6500 and Deep Tow - On Board of the R/V YOKOSUKA
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Second Plan for the Dives
Geological Survey of Brazil - CPRM
5 Dives Shinkai 1 Deep Tow
2 Dives Shinkai 1 Deep Tow
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Geological Survey of Brazil - CPRM
3D View - São Paulo Ridge - SP 01
Sediment - Ripple Marks
Basalt- Carbonate
Nodules Crust
Nodules Crust - Breach - Volcanic Rocks Carbonate / Fe-Mn Crust
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Planning Phase
Background
Information
Questions and
Concepts
ISBA
Recommendations
ISA, 2007
ISBA/19/LTC/8
Field Phase Survey I
Survey II
Environmental Baseline
Monitoring Plan
“Geophysical
Exploration"
Exploration with
Monitoring Phase
Geological Exploration
Monitoring Survey III
Geological Survey of Brazil - CPRM
ISA Work Plan – next 5 years
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Next Steps
CTD/Rosette
Station
Geological Survey of Brazil - CPRM
Lowered ADCP AUV
ROV
HROV
Seafloor
Drill
ROV Drill
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Geological Survey of Brazil - CPRM
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Roberto Ventura Santos
Director of Geology and Mineral Resources (DGM)
Ivo Pessanha Head of Marine Geology Division (DIGEOM)
www.cprm.gov.br
Geological Survey
of Brazil - CPRM