rio grande rise

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


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


Levantamento Regional:

60 km

200 km

• MBES/backscatter

• Water Column

• Gravimetry

• Magnetometry

• SBP (Sísmica rasa)

• CTD

• Water Samples


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

?

?


Regional Survey

CTD/Rosette

Station

CTD/Rosette

Station


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


March 2013

COLMEIA COLd Mantle Exhumation and Intra-transform Accretion

March 2013


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


Rio Grande Rise São Paulo Ridge

~1500km

• MBES/Backscatter • Gravimetry • Magnetometry • CDT • Dredging

Data on the Rio Grande Rise


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


Start

Finish

Movement

Spot Sampler - TV GRAB


Start

Finish

Movement

Core Sampler - Jumbo Piston Core


Start

Finish

Movement

Rock Samples on Board Ship


Bathymetric Map - Rio Grande Rise - Alpha Area


Pockmaks

Width ~30km

Length ~400km

Probaly caused escape gas??

Area: ~50,000km²

Mud Volcano


Backscattering survey


3D View - Rio Grande Rise - Pockmarks

Sediment

Rock

Pockmarks

Width ~30km


Cobalt-Rich

Ferromanganese Crusts


Alpha

Bravo


Biotite

gnaisse

Granite Pegmatite

ProERG - Summary in numbers

2009 - 2010 (Brazilian Navy Partnership)


2011 - 2013


• 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



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

Second Plan for the Dives


5 Dives Shinkai 1 Deep Tow

2 Dives Shinkai 1 Deep Tow


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


ISA Work Plan – next 5 years

Next Steps

CTD/Rosette

Station


Lowered ADCP AUV

ROV

HROV

Seafloor

Drill

ROV Drill

Roberto Ventura Santos

Director of Geology and Mineral Resources (DGM)

Ivo Pessanha Head of Marine Geology Division (DIGEOM)

[email protected]

www.cprm.gov.br

Geological Survey

of Brazil - CPRM

rio grande rise

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