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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1989-003-FA

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Other ID: none

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Principal Investigator(s): Kim D. Klitgord

Affiliate Investigator(s): Leonid V. Dmitriev - Vernadsky Institute of Geochemistry

Information Specialist(s):

Data Type(s): Sonar: Multibeam, Electro-Magnetic: Magnetics, Electro-Magnetic: Gravity, Sampling: Biology, Sampling: Geology, Seismics: Air Gun / Water Gun

Scientific Purpose/Goals: The overall objective of the 12th cruise leg 1 of the R/V PETROV was to initiate an integrated geological sampling and geophysical surveying program of the Mid-Atlantic Ridge between the Atlantis Fracture Zone and the Hayes Fracture Zone, from 30 degrees N to 34 degrees N. The sampling and survey program was designed to address specific scientific objectives related to understanding the geological, geochemical, and geodynamic processes that help to control the generation and subsequent deformation of oceanic lithosphere. These scientific objectives are summarized as follows: 1) Establishing the morphotectonic framework of the axial Mid-Atlantic Ridge by: a. identifying and mapping the large-offset and the "zero-offset transform/fracture zones and the variability in their fault systems; b. identifying and mapping the axial bathymetric high, rift-valley graben, and flanking fault blocks including the segmentation characteristics of the ridge; and c. identifying and mapping magnetic lineations that provide age-isochron information and other magnetic signatures that reflect magmatic processes at the ridge. 2) Establishing the magmatic contribution to oceanic crustal generation by: a. determining the geochemical variations along the ridge axis in young oceanic crust; b. examining the relationships between these variations and ridge segmentation; and c. examining of small-scale variations at large-offset, small-offset, and zero-offset transform zones. 3) Investigating the deformation of oceanic crust within transform/fracture zones by: establishing the metamorphic character of mafic and ultramafic rocks, including microfabric, fluid-inclusion, and geochemical evidence.

Vehicle(s):

Start Port/Location: Rotterdam, Netherlands

End Port/Location: Bridgetown, Barbados

Start Date: 1989-02-02

End Date: 1989-02-28

Equipment Used: Air gun, Marine magnetometer, Gravity meter (wh), Dredge, Hollming Echos 625 multibeam

Information to be Derived:

Summary of Activity and Data Gathered:

Staff: Kim D. Klitgord

Affiliate Staff:
Dr. Leonid Dmitriev - Soviet co-chief scientist (Vernadsky Institute of Geochemistry
Moscow
Russia); Dr. John F. Casey - petrologist (University of Houston
Houston
TX
USA); Mr. Kevin Johnston - petrologist (MIT-WHOI joint program
Woods Hole
MA
USA); Prof. Vladimar Tulin - gravity specialist (Institute of Physics of the Earth
Moscow
Russia); Dr. Sergei Silantiev - metamorphic petrologist (Vernadsky Institute of Geochemistry
Moscow
Russia); Sergei Zahpunny - Expedition secretary
facilitator (Vernadsky Institute of Geochemistry
Moscow
Russia); Ruben Magakyan - petrologist - chief of dredge operations (Vernadsky Institute of Geochemistry
Moscow
Russia); Mikhail Reisner - computer expert (Vernadsky Institute of Geochemistry
Moscow
Russia); Matalia Kononkova - petrologist and watch stander (Institute of Geology
Moscow
Russia); Dr. Vladimar V. Mayorshin - magnetic specialist (Institute of Terrestrial Maganetism - Troizk
Moscow
Russia); Mikhail Zakharov - multibeam bathymetry specialist (Institute of Geology
Moscow
Russia); Vadim Golod - seismic specialist (Institute of Geology
Moscow
Russia); Boris Bazylev - ultramafic petrologist
dredge operations team (Vernadsky Institute of Geochemistry
Moscow
Russia); Lyudmila Polosina - thin-section lab operations (Vernadsky Institute of Geochemistry
Moscow
Russia); Olga Tsameryan - petrologist
multibeam bathymetry watch (Vernadsky Institute of Geochemistry
Moscow
Russia)

Notes: Project = Mid-Atlantic Ridge Crest Processes, Mid-Atlantic Ridge Crest Processes

Information from Foghorn:All geophysical measurement and geologic sampling systems provided by the Soviets: Multibeam bathymetric mapping system; Gravity system; Magnetometer system; Navigation system; Single-Channel Seismic Reflection Profiling System; Deep-Sea Winch and Barrel Dredge Rock Sampling System; Water Chemistry and Physical Oceanography system;
Added equipment AirGun based on information written on the box in the WHOI library.

Location:

Atlantis Fracture Zone, Hayes Fracture Zone, Mid-Atlantic Ridge axis, North Atlantic;

Boundaries
North: 35 South: 30 West: -45 East: -30

Platform(s):

photo of Akademik Boris Petrov
Akademik Boris Petrov

Publications

Klitgord, K.D., Dmitriev, L.V., Casey, J.F., Silantiev, S., and Johnson, K., 1993, U.S.-Soviet collaborative geological and geophysical survey of the Mid-Atlantic Ridge near 31 degrees N, the Petrov Fracture Zone: U.S. Geological Survey Open-File Report 94-007, 23 p., https://doi.org/10.3133/ofr1994007.

Portals/Viewers

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Air gun --- Air Gun / Water Gun
1989-003-FA-SE-001 (microfilm of RUSSIAN COOP-KLITGORD)
Marine magnetometer --- Magnetics
Gravity meter (wh) --- Gravity
Dredge --- Biology
Geology
Hollming Echos 625 multibeam --- Multibeam

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