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

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

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

Geological Survey of Brazil - CPRM

Levantamento Regional:

60 km

200 km

• MBES/backscatter

• Water Column

• Gravimetry

• Magnetometry

• SBP (Sísmica rasa)

• CTD

• Water Samples

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

20

4 k

m

SEGMENTO 11

x

?

?

Geological Survey of Brazil - CPRM

Regional Survey

CTD/Rosette

Station

CTD/Rosette

Station

Geological Survey of Brazil - CPRM

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

March 2013

COLMEIA COLd Mantle Exhumation and Intra-transform Accretion

March 2013

March 2013

March 2013

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

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

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

Start

Finish

Movement

Dredging in the Rio Grande Rise

Geological Survey of Brazil - CPRM

Start

Finish

Movement

Spot Sampler - TV GRAB

Geological Survey of Brazil - CPRM

Start

Finish

Movement

Core Sampler - Jumbo Piston Core

Geological Survey of Brazil - CPRM

Start

Finish

Movement

Rock Samples on Board Ship

Geological Survey of Brazil - CPRM

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

Geological Survey of Brazil - CPRM

Backscattering survey

Geological Survey of Brazil - CPRM

3D View - Rio Grande Rise - Pockmarks

Sediment

Rock

Pockmarks

Width ~30km

Geological Survey of Brazil - CPRM

Cobalt-Rich

Ferromanganese Crusts

Geological Survey of Brazil - CPRM

Alpha

Bravo

Geological Survey of Brazil - CPRM

Biotite

gnaisse

Granite Pegmatite

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

Geological Survey of Brazil - CPRM

Submersible Shinkai 6500 and Deep Tow - On Board of the R/V YOKOSUKA

Second Plan for the Dives

Geological Survey of Brazil - CPRM

5 Dives Shinkai 1 Deep Tow

2 Dives Shinkai 1 Deep Tow

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

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

Next Steps

CTD/Rosette

Station

Geological Survey of Brazil - CPRM

Lowered ADCP AUV

ROV

HROV

Seafloor

Drill

ROV Drill

Geological Survey of Brazil - CPRM

Roberto Ventura Santos

Director of Geology and Mineral Resources (DGM)

Ivo Pessanha Head of Marine Geology Division (DIGEOM)

ivo.pessanha@cprm.gov.br

www.cprm.gov.br

Geological Survey

of Brazil - CPRM