Ship Request

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  Melting Off-Axis  -  2016  -  Atlantis  
  Project Information  
Project Title: Melting in the Off-Axis Environment - Field and Modeling Studies of the 8° 20'N Seamount Chain and EPR Axis- Alvin Diving Project Status: Submitted
Principal Investigator: Patricia Gregg, UIUC Project Institution: UIUC
Project ID: 104033 Version #: 4
Date Submitted: 8/8/2013 8:04:00 AM Created By: Daniel J. Fornari
Date Last Modified: 2/5/2015 8:37:00 PM URI Serial #: None
Funding Agencies: NSF/OCE/MGG - 1356610 - Funded
Summary of Field Work: The 8°20’N Seamount chain, located west of the East Pacific Rise (EPR) Siqueiros transform fault ridge-transform intersection (RTI), is an ideal location to test models of melt production and transport because it consists of a ridge-perpendicular volcanic chain extending ~200 km (to ~ 3.6 My seafloor) away from the ridge axis. We propose that melts delivered through the crust to build these seamounts provide geochemical ‘probes’ into the upper mantle adjacent to a fast-spreading MOR axis. This investigation will provide critical constraints to study the formation of off-axis oceanic crust and the development of near-axis seamount chains, and to test models of melt distribution and extraction, all of which are fundamental first-order processes associated with the formation of oceanic lithosphere and the evolution of the upper mantle.

Our 2-yr interdisciplinary investigation includes: (1) a seagoing expedition to collect geophysical data, conduct 15 (fifteen) Alvin dives to systematically make observations and collect in situ lava samples, and also dredge the 8°20’N Seamount Chain; (2) analytical geochemistry to collect major and trace element data; (3) geophysical data analyses; and (4) petrologic-geodynamic modeling of mantle melting and melt extraction.

Our acquisition plan for the bathymetric, gravity and magnetics survey data covering the 8°20’N Seamount chain includes first conducting shipboard underway surveying using the RV Atlantis’ EM2112 multibeam system, a BGM-3 gravimeter, and a Marine Magnetics SeaSpy towed magnetometer. Our proposed survey includes ~4 days of E-W oriented survey lines spaced ~9 km apart to provide reasonable overlap in bathymetric and derived-sidescan coverage, which should be nominally ~3.5x water depth over most of the survey area. We will spend an additional 4 days collecting N-S oriented tie lines at lengths over specific seamounts, which are critical for addressing seamount formation using magnetics data. The 60-km long tie lines will be collected during the geophysical survey, while the shorter 15 and 30 km N-S lines will be collected at night during the Alvin diving portion of the program.

The second phase of the field effort will be devoted to site-specific Alvin diving along the seamount chain and collecting observations and in situ samples, and at night conducting both dredging and TowCam surveys as reconnaissance of ~30 volcanoes in the 8°20’N chain focusing on sampling the largest seamounts farthest away, at the midpoint, and the ones closest to the EPR axis. The Alvin diving and dredge plan will be dictated by the findings of our multibeam and derived-sidescan surveys, as well as reconnaissance using TowCam, but we expect that we will devote approximately 2-3 Alvin dives to each of at least 5-7 of the largest volcanoes at distal, middle and proximal locations with respect to the EPR axis in order to better constrain whether magmas feeding them were of similar compositions throughout their construction (i.e., sampling summit and basal edifice lavas, or on flank-scarps that may expose older flows). We will also dredge as many additional volcanoes of various sizes distributed evenly along the 8°20’N chain as we can during nights when Alvin is charging batteries.

Based on extensive experience by Fornari and Perfit with Alvin diving and dredging both seamounts and the EPR axis, we are confident that we can accomplish at least 2 dredges each night when Alvin is charging its batteries and that we can collect ~20 well located samples with Alvin on each dive.
Summary of Facility Requirements: RV Atlantis with Alvin submersible and USBL navigation, and near-bottom sonar mapping system with DVL navigation and compartmentalized baskets for rock collecting. Atlantis geophysical survey systems must include EM2112 multibeam system, BGM3 gravimeter, towed SeaSpy magnetometer. The science party will provide the WHOI-MISO TowCam deep sea camera system which requires the stbd CTD winch and hydroboom, with 3 conductor 0.322" CTD wire with winch controls and tension/wire out readouts in the main lab.

At least 6 fully rigged SIO style dredges should be available with SIO weak link system and spares calibrated bolts for weak links. Extra net bags, chain bags, burlap, and dredging supplies should be available through the operator.

2 functioning deep sea pingers (12 kHz) should be available.

Extra USBL beacons for the TowCam and dredge wire should also be available

The PI P. Gregg has moved to U. Illinois as of Summer 2014
Ship Request Identification
Type of Request: Primary Ship Use Request Status: Submitted
Request ID: 1006450 Created By: Daniel J. Fornari
Date Last Modified: 2/5/2015 8:37:00 PM Date Submitted: 8/8/2013 8:04:00 AM
Requested Ship, Operating Days and Dates
Year: 2016 Ship/Facility: Atlantis
Earliest Start Date: 1/1/2016 Multi-Ship Op: No
Latest Start Date: 4/1/2016 Other Ship(s):

Operating Days Needed: Science Days Mob Days De-Mob Days Estimated Transit Days Total Days
23 3 3 7 36
Repeating Cruise?
(within same year)
No Interval:   # of Cruises:  

Description of Repeating cruise requirements:
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations:
Work Area for Cruise
Short Description of Op Area
for use in schedules:
8 20N EPR
Description of Op Area: East Pacific Rise flank west of Siqueiros Transform between 8N and 8 30'N and 104W and 107W
Op Area Size/Dia.: 10800
  Lat/Long Marsden Grid Navy Op Area
8° N / 104° W map
11 map
NP13 map
8.5° N / 107° W map
11 map
NP13 map
  Show Degrees Minutes    
Foreign Clearance and Permitting Requirements
Foreign Clearance Required? No Coastal States:
 Important Info on Foreign Research Clearances  

Are you or any member in your science party bringing in any science equipment items which are regulated for export by the International Traffic in Arms Regulations (ITAR) and/or the Export Administration Regulations (EAR)?
No If yes, have you applied for the necessary permits through your export control office? No
 Questions about ITAR/EAR regulations?

Comments about foreign clearance requirements or
description of any other special permitting requirements
(e.g., MMPA, ESA, IHA, Marine Sanctuaries, etc.)
Port Calls
Requested Start Port Intermediate Port(s) Requested End Port
Manzanillo, Mexico None Manzanillo, Mexico
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops
start/end port could also be Pt. Caldera (Puntarenas) Costa Rica depending on ship movement/logistics

 Important Info on Working in Foreign Ports

Science Party
Chief Scientist: Patricia Gregg, UIUC
# in Science Party 20 # of different science teams 3 # Marine Technicians to be
provided by ship operator:
(include in science party total)
Explanation of Science Party Requirements and Technician Requirements multibeam and dredging shipboard techs required
Alvin near-bottom mapping is required, data processor from NDSF requested for near-bottom multibeam
TowCam will have its own engineer provided by the science party
Instrumentation Requirements That Impact Scheduling Decisions
Selected Dynamic PositioningUnselected ADCPSelected MultibeamUnselected Seismic
Selected Dredging/Coring/Large Dia. Trawl WireUnselected Stern A-frameUnselected Fiber Optic (.681)Unselected 0.680 Coax Wire
Unselected SCUBA DivingUnselected Radioisotope use - briefly describeUnselected NO Radioisotope use/Natural level workSelected Other Operator Provided Inst. - Describe
0 PI-Provided Vans - briefly describe Unselected MOCNESS  
Explain Instrumentation or Capability
requirements that could affect choice
of ship in scheduling.

EM2112 multibeam
BGM3 gravimeter
SeaSpy towed magnetometer for geophysical surveying

6 SIO style dredges and weak links with spare net bags

Major Ancillary Facilities (that require coordination of schedules with ship schedule)
Unselected Helicopter Ops (USCG)Unselected Twin OtterUnselected Unmanned Aerial Systems (UAS) 
Autonomous Underwater Vehicle (AUV)
Unselected Other AUVUnselected Sentry  
Coring Facility
Unselected Jumbo Piston CoringUnselected Large Gravity Core Unselected MC800 multicorer w/ MISO camera/telemetryUnselected OSU Coring Facility (MARSSAM)
Unselected Other Large Coring FacilityUnselected WHOI Long Core  
Human Occupied Vehicle (HOV)
Selected AlvinUnselected Clelia (HBOI)Unselected JSL I & II (HBOI)Unselected Other HOV
Other Facility
Unselected MISO Facility - deep-sea imagingUnselected Other FacilityUnselected Potential Fields Pool Equipment 
Remotely Operated Vehicle (ROV)
Unselected JasonUnselected Other ROV  
Seismic Facility
Unselected Ocean Bottom Seismograph Instrument Center (OBSIC)Unselected Ocean Bottom Seismograph Instrument Pool (OBSIP)Unselected Ocean-Bottom Seismometer Program (UTIG)Unselected Other Seismic/OBS Facility
Unselected PASSCALUnselected Portable MCS groupUnselected Portable MCS/SCS groupUnselected U.S. Geological Survey Ocean Bottom Seismometer Facility (USGS at WHOI)
Towed Underwater Vehicle
Unselected ARGO IIUnselected Hawaii MR1 (HMRG)Unselected IMI12 (HMRG)Unselected IMI120 (HMRG - formerly DSL 120A)
Unselected IMI30 (HMRG)Selected Other Towed Underwater VehicleUnselected Towfish 
UNOLS Van Pool
Unselected AUV Lab Van #1Unselected Clean Lab VanUnselected Cold Lab VanUnselected General Purpose Lab Van
Unselected Radioisotope Lab VanUnselected Wet Lab Van  
UNOLS Winch Pool
Unselected Mooring SpoolerUnselected Portable WinchUnselected Turn Table 
Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems.
WHOI MISO TowCam system

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