Cruise DRFT06RRLima, Peru – Easter Island, Chile

Survey of the Nazca Ridge and Easter/Salas y Gomez Seamount Chain

November 5th – December 14th, 2001

on the R/V Roger Revelle

David Naar, Univ. of S. Florida, Chief ScientistKevin Johnson, Bishop Museum, Co-ChiefDoug Pyle, Oregon State Univ., Co-ChiefPaul Wessel, Univ. of Hawaii, Co-ChiefGreg Berman and Kate Ciembronowicz, USFBrian Donahue and Leigh Ann Elgin, USFYasushi Harada and Jyotiranjan S. Ray, UHChris Russo, Oregon State UniversityHetu Sheth, University of HawaiiAmy Wright, USF

(in spirit: Robert Duncan, Co-PI, OSU & John Mahoney, Co-PI, UH)

Cruise ParticipantsCruise Participants::

Predicted bathymetry map of study Predicted bathymetry map of study area with previous sample locationsarea with previous sample locations

Box EBox E

SMT 19SMT 19

Cone Type VolcanoCone Type Volcano

SMT 19 - 2D - BathymetrySMT 19 - 2D - Bathymetry

-23d 50’

-24d 00’

-83d 50’ -83d 40’ -83d 30’

SMT 19 - Sidescan DataSMT 19 - Sidescan Data

23d 40’

24d 00’

23d 50’

Back Scatter (dB)

-45 -40 -35 -25 -20 -15 -10 -5

-84d 00’ -83d 45’ -83d 30’ -83d 15’

0 10 20

Kilometers

SMT 19 - 2D Bathymetry - CarisSMT 19 - 2D Bathymetry - Caris

23d 40’

24d 00’

23d 50’

-84d 00’ -83d 45’ -83d 30’ -83d 15’

0 10 20

Kilometers

Processed at 110 Meters per pixel

SMT 19 - 3D – Bathymetry CarisSMT 19 - 3D – Bathymetry Caris

Processed at 110 meters per pixel, vertical exaggeration 10 X

SMT 20 SMT 20

Ridge type volcanic structureRidge type volcanic structure

SMT 20 - 2D BathymetrySMT 20 - 2D Bathymetry

-23d 50’

-24d 00’

-84d 10’ -84d 00’ -83d 50’

SMT 20 - Sidescan DataSMT 20 - Sidescan Data

24d 00’

24d 20’

24d 10’

Back Scatter (dB)

-45 -40 -35 -25 -20 -15 -10 -5

-84d 30’ -84d 15’ -84d 00’ -83d 45’ -83d 30’

0 10 20

Kilometers

SMT 20 - 2D Bathymetry - CarisSMT 20 - 2D Bathymetry - Caris

0 10 20

Kilometers

24d 00’

24d 20’

24d 10’

-84d 30’ -84d 15’ -84d 00’ -83d 45’ -83d 30’

Processed at 110 Meters per pixel

SMT 20 - 3D – Bathymetry CarisSMT 20 - 3D – Bathymetry Caris

Processed at 110 meters per pixel, vertical exaggeration 10 X

Plate Boundaries

See wax video

Hot Spot Time AnimationHot Spot Time Animation

Dredge Stats……Dredge Stats……Total: 68 – Total: 68 – datable geochem other empty 24 9 24 11This comes out to a batting average of352 for rocks suitable for dating485 for rocks suitable for geochemistry(not bad for old volcanoes – IODP next)(other includes biology, sediments, andAlien space pods)

Thanks to the Captain and Crewof the R/V Revelle and our

computer experts Dan Jacobson and Steve Foley

Special thanks to Gene Pillard, “The Guru of Dredging”

For additional information:For additional information:

on board:on board:http://revelle.uscd.edu/Revelle/drft06rr/http://revelle.uscd.edu/Revelle/drft06rr/

on land:on land:http://www.marine.usf.edu/http://www.marine.usf.edu/

And Finally

The Cruise T-shirt

The Front

see Kate, $15 each

The Back