Woods Hole Oceanographic Institution

Cruise Planning Synopsis


AT42-17: Kelley "Pythia's Oasis"

Ship

R/V Atlantis

Vehicles

AUV Sentry, ROV Jason
- added ROV Jason on Jul 18, 2019 11:12 AM by Sarah Fuller
- added AUV Sentry on Jul 18, 2019 11:12 AM by Sarah Fuller

Cruise Party

Deborah Kelley: Chief Scientist, Principal Investigator
Univerity of Washington, School of Oceanography 1501 NE Boat St P.O. BOX 357940 Seattle, WA USA 98195
+1 206 685 9556
dskelley@uw.edu
- added Deborah Kelley as Chief Scientist on Jul 18, 2019 11:12 AM by Sarah Fuller
- added Deborah Kelley as Principal Investigator on Jul 18, 2019 11:12 AM by Sarah Fuller

Departure: Sep 17, 2019

Newport

Arrival: Oct 3, 2019

Newport

Operations Area

Due west of Newport Oregon
- Due west of Newport Oregon on Jul 18, 2019 11:12 AM by Sarah Fuller
Lat/Lon: 44° 29.0′ N / 125° 4.0′ W
- set lat to 44° 29.0′ N, set lon to 125° 4.0′ W on Jul 18, 2019 11:12 AM by Sarah Fuller
Depth Range: 800 / 1400
- set min to 800, set max to 1400 on Jul 18, 2019 11:12 AM by Sarah Fuller
Will the vessel be operating within 200 NM of a foreign country? NA
- NA on Jul 18, 2019 11:12 AM by Sarah Fuller
Are visas or special travel documents required? no
- set to no on Jul 18, 2019 11:12 AM by Sarah Fuller

Science Objectives

During a single remotely operated vehicle (ROV) dive in 2015, a remarkable seep site called Pythia’s Oasis was discovered 19 km inboard from the toe of the accretionary prism of the Cascadia Margin at a water depth of ~1040 m. The site is unlike any seep yet described along active margins, hosting an intense fluid-dominated venting system issuing low-salinity, hydrocarbon-bearing fluids at 11.8 C, greater than three times above background seawater values. The emanating fluids carry low concentrations of suspended particles from a discrete orifice, reminiscent of a mid-ocean ridge hot spring. The bubble component of the vent rises as a plume > 450 m into the overlying hydrosphere; it has been active for at least three years. A second adjacent site includes an extensive collapse zone hosting multiple seeps issuing diffuse, schlieren flow reflecting egress of warm and/or low salinity fluids. Two other plumes have also been documented. The goal of this two-year collaborative effort is to characterize the geology and chemistry of this extraordinary seep site to test three specific hypotheses:

1. Fluids originate from a meteoric source, and thus, play no role in the seismogenic behavior of the margin, but may contribute to element transport between land and ocean, impacting the current understanding of coastal hydrogeology.

2. Fluids originate from smectite-illite dehydration in the accreted sediments rather than at the plate boundary, providing important information on fluid production and overpressure development within the accretionary prism above the plate boundary.

3. Fluids originate from high temperature metamorphic reactions at depth in the seismogenic region of the Cascadia Subduction Zone (CSZ), resulting in extreme overpressures at the plate boundary. If so, either these dehydration reactions explain the partially locked behavior of the fault in this section of the margin or suggest that the locked seismogenic zone may not correspond to moderate overpressures as postulated for Nankai and Costa Rica.

- During a single remotely operated vehicle (ROV) dive in 2015, a remarkable seep site called Pythia’s Oasis was discovered 19 km inboard from the toe of the accretionary prism of the Cascadia Margin at a water depth of ~1040 m. The site is unlike any seep yet described along active margins, hosting an intense fluid-dominated venting system issuing low-salinity, hydrocarbon-bearing fluids at 11.8 C, greater than three times above background seawater values. The emanating fluids carry low concentrations of suspended particles from a discrete orifice, reminiscent of a mid-ocean ridge hot spring. The bubble component of the vent rises as a plume > 450 m into the overlying hydrosphere; it has been active for at least three years. A second adjacent site includes an extensive collapse zone hosting multiple seeps issuing diffuse, schlieren flow reflecting egress of warm and/or low salinity fluids. Two other plumes have also been documented. The goal of this two-year collaborative effort is to characterize the geology and chemistry of this extraordinary seep site to test three specific hypotheses:

1. Fluids originate from a meteoric source, and thus, play no role in the seismogenic behavior of the margin, but may contribute to element transport between land and ocean, impacting the current understanding of coastal hydrogeology.

2. Fluids originate from smectite-illite dehydration in the accreted sediments rather than at the plate boundary, providing important information on fluid production and overpressure development within the accretionary prism above the plate boundary.

3. Fluids originate from high temperature metamorphic reactions at depth in the seismogenic region of the Cascadia Subduction Zone (CSZ), resulting in extreme overpressures at the plate boundary. If so, either these dehydration reactions explain the partially locked behavior of the fault in this section of the margin or suggest that the locked seismogenic zone may not correspond to moderate overpressures as postulated for Nankai and Costa Rica.

 on Jul 18, 2019 11:12 AM by Sarah Fuller

Science Activities

During this expedition utilizing Jason and Sentry, the key science activities include 1) completing a high resolution bathymetric map of the Pythias site and surrounding area; 2) completing a photomosaic of the keep seep sites for documentation of the geology, tectonics, seeps, and associated biology, 3) conducting multiple surveys with Jason for sampling and seafloor/seep characterization; 4) fluid sampling of the seep sites using IGTs' and major samplers for fluid chemistry; collection of multiple push cores for pore fluid chemistry, 5) conduting a heat flow probe survey (Rob Harris-OSU) in a 'pogo' fashion; and 6) use of the OSU core facility infrastucture (Paul Walczak -container, flat rack, coring shack, and Hiab crane) to recover a series of cores.
- During this expedition utilizing Jason and Sentry, the key science activities include 1) completing a high resolution bathymetric map of the Pythias site and surrounding area; 2) completing a photomosaic of the keep seep sites for documentation of the geology, tectonics, seeps, and associated biology, 3) conducting multiple surveys with Jason for sampling and seafloor/seep characterization; 4) fluid sampling of the seep sites using IGTs' and major samplers for fluid chemistry; collection of multiple push cores for pore fluid chemistry, 5) conduting a heat flow probe survey (Rob Harris-OSU) in a 'pogo' fashion; and 6) use of the OSU core facility infrastucture (Paul Walczak -container, flat rack, coring shack, and Hiab crane) to recover a series of cores.
 on Jul 18, 2019 11:12 AM by Sarah Fuller

Additional Info

Pre-cruise Planning Meeting: Teleconference
- Teleconference on Jul 18, 2019 11:12 AM by Sarah Fuller
- on Jul 18, 2019 11:12 AM by Sarah Fuller

Stations:

  Station 1
  Distance: 50-60
  Days: 16
  Latitude: 44° 29.0’ N
  Longitude: 125° 4.0’ W
- added Name: Lat: 44° 29.0’ N, Lon: 125° 4.0’ W, Distance: 50-60, Days: 16 on Jul 18, 2019 11:12 AM by Sarah Fuller

Supporting documentation:

Funding

Funding Agency: NSF
Grant or contract number: OCE 1658201

Scientific Instrumentation for R/V Atlantis


Science Van 1 Revisions
-added Science Van1 on Jul 18, 2019 11:12 AM by Sarah Fuller

Science Van 2 Revisions
-added Science Van2 on Jul 18, 2019 11:12 AM by Sarah Fuller

Science Van 3 Revisions
-added Science Van3 on Jul 18, 2019 11:12 AM by Sarah Fuller

Science Van 4 Revisions
-added Science Van4 on Jul 18, 2019 11:12 AM by Sarah Fuller

Shipboard Equipment

12 kHz Pinger for Wire Use,
A-Frame,
ADCP 75 kHz,
Bathymetry System 12 kHz,
Bathymetry System 3.5 kHz ,
Crane,
Deionized Water System,
Fume Hood,
Multibeam ,
Navigation - Heading,
Navigation - Position,
Science Underway Seawater System,
Sippican XBT System (Mark 21),
Transponder Navigation - Sonardyne USBL
-added 12 kHz Pinger for Wire Use on Jul 18, 2019 11:12 AM by Sarah Fuller
-added A-Frame on Jul 18, 2019 11:12 AM by Sarah Fuller
-added ADCP 75 kHz on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Bathymetry System 12 kHz on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Bathymetry System 3.5 kHz on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Crane on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Deionized Water System on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Fume Hood on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Multibeam on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Navigation - Heading on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Navigation - Position on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Science Underway Seawater System on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Sippican XBT System (Mark 21) on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Transponder Navigation - Sonardyne USBL on Jul 18, 2019 11:12 AM by Sarah Fuller

Shipboard Communication

Basic Internet access via HiSeasNet
-added Basic Internet access via HiSeasNet on Jul 18, 2019 11:12 AM by Sarah Fuller

CTD/Water Sampling

911+ Rosette 24-position, 10-liter bottle Rosette with dual T/C sensors,
SBE43 oxygen sensor,
Wet Labs C*Star transmissometer (660nm wavelength),
Wet Labs ECO-AFL fluorometer,
Wet Labs FLNTURTD Combination Flourometer and Turbidity Sensor
-added 911+ Rosette 24-position, 10-liter bottle Rosette with dual T/C sensors on Jul 18, 2019 11:12 AM by Sarah Fuller
-added SBE43 oxygen sensor on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Wet Labs C*Star transmissometer (660nm wavelength) on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Wet Labs ECO-AFL fluorometer on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Wet Labs FLNTURTD Combination Flourometer and Turbidity Sensor on Jul 18, 2019 11:12 AM by Sarah Fuller

Critical CTD Sensors

pH
- added pH on Jul 18, 2019 11:12 AM by Sarah Fuller

MET Sensors

Air temperature,
Barometric Pressure,
Relative Humidity,
Short Wave Solar Radiation,
Wind speed and direction
-added Air temperature on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Barometric Pressure on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Relative Humidity on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Short Wave Solar Radiation on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Wind speed and direction on Jul 18, 2019 11:12 AM by Sarah Fuller

Sediment Sampling

Gravity corers
-added Gravity corers on Jul 18, 2019 11:12 AM by Sarah Fuller

Sample Storage

Climate Controlled Walk-in,
Freezer -70°C 25 cu. ft.,
Freezer -70°C 3.2 cu. ft. ea.,
Refrigerator 8.6 cu. ft.,
Scientific Walk-in Freezer,
Scientific Walk-in Refrigerator
-added Climate Controlled Walk-in on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Freezer -70°C 25 cu. ft. on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Freezer -70°C 3.2 cu. ft. ea. on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Refrigerator 8.6 cu. ft. on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Scientific Walk-in Freezer on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Scientific Walk-in Refrigerator on Jul 18, 2019 11:12 AM by Sarah Fuller
Storage Notes:

Navigation

Will you be using Long Base Line (LBL) navigation? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
How many nets? null
How many tansponders? null
Will you be using Ultra-short baseline (USBL) navigation?no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller

Navigation

GPS,
USBL
-added GPS on Jul 18, 2019 11:12 AM by Sarah Fuller
-added USBL on Jul 18, 2019 11:12 AM by Sarah Fuller
Navigation Notes: May conduct concurrent sentry and jason dives
- added May conduct concurrent sentry and jason dives on Jul 18, 2019 11:12 AM by Sarah Fuller

Winches

CTD Winch with .322" Electro-mechanical wire,
Hydro Winch with .25" hydro wire,
Trawl Winch with 9/16th trawl wire
-added CTD Winch with .322" Electro-mechanical wire on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Hydro Winch with .25" hydro wire on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Trawl Winch with 9/16th trawl wire on Jul 18, 2019 11:12 AM by Sarah Fuller
Winch Notes: See note under OSU coring facility - during precruise meeting with Paul Walczak and Evan Solomon (Co-Chief) it will be important to talk about use of the Alvin LARS system for coring.
- added See note under OSU coring facility - during precruise meeting with Paul Walczak and Evan Solomon (Co-Chief) it will be important to talk about use of the Alvin LARS system for coring. on Jul 18, 2019 11:12 AM by Sarah Fuller

Wire use and application

CTD Winch with .322" Electro-mechanical wire,
Trawl Winch with 9/16th trawl wire
-added CTD Winch with .322" Electro-mechanical wire on Jul 18, 2019 11:12 AM by Sarah Fuller
-added Trawl Winch with 9/16th trawl wire on Jul 18, 2019 11:12 AM by Sarah Fuller
Winch Notes: See note under OSU coring facility - during precruise meeting with Paul Walczak (OSU) and Evan Solomon (UW-Co-Chief) it will be important to talk about use of the Alvin LARS system for coring and for the heat flow probe (Rob Harris - OSU).
- added See note under OSU coring facility - during precruise meeting with Paul Walczak (OSU) and Evan Solomon (UW-Co-Chief) it will be important to talk about use of the Alvin LARS system for coring and for the heat flow probe (Rob Harris - OSU). on Jul 18, 2019 11:12 AM by Sarah Fuller

Standard Oceanographic Cables

Slip ring required? no
Non-standard wire required? no
Traction winch required? no

Specialized Deck Equipment

Mooring Deployment/Recovery Equipment Required: no Type: 
Cruise Specific Science Winch Required: yes Type: Heat flow and coring
Nets Required: no Type: 
Cruise Specific Science Winch Revisions

- Cruise Specific Science Winch Required? : changed from no to yes on Jul 19, 2019 1:17 PM by Eric Benway
- Cruise Specific Science Winch Required? : added no on Jul 18, 2019 11:12 AM by Sarah Fuller
- Type : added Heat flow and coring on Jul 18, 2019 11:12 AM by Sarah Fuller

Over the Side Equipment

Will you be bringing any equipment (winches, blocks, etc.) that lowers instruments over the side? yes
Details: 
Hiab crane - starboard side just aft of the door for the CTD boom for coring
- added 
Hiab crane - starboard side just aft of the door for the CTD boom for coring
 on Jul 18, 2019 11:12 AM by Sarah Fuller

Special Requirements

Elecrical Power: no Identify 
Equipment Handling: no Identify: 
Inter/intraship Communications: no Identify: 
Science Stowage: no Identify: 
Water: no Identify: 

Additional Cruise Items/Activities

Explosive Devices:no
Portable Air Compressors:no
Flammable Gases:yes
Small Boat Operations:no
SCUBA Diving Operations:no

Hazardous Material

Will hazardous material be utilized?yes
- added yes on Jul 18, 2019 11:12 AM by Sarah Fuller
Describe deployment method and quantity:
Will discuss during precruise
- added Will discuss during precruise on Jul 18, 2019 11:12 AM by Sarah Fuller

Radioactive Material

Radioiosotopes:no

Additional Information

Is night time work anticipated on this cruise?yes
- added yes on Jul 18, 2019 11:12 AM by Sarah Fuller
Specialized tech support (Seabeam, coring, other):
Jason-sentry dives, coring, and heat flow surveys
- added Jason-sentry dives, coring, and heat flow surveys on Jul 18, 2019 11:12 AM by Sarah Fuller
Other required equipment and special needs:

Scientific Instrumentation for HOV Jason


Current Chart(s):

Site Survey

Will you provide detailed charts of the work area(s)?no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
If no, willl you need R/V Atlantis to generate maps of the work area(s)?no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Will you need post-dive maps of the work area generated?no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller

Navigation

Will you be using Long Base Line (LBL) navigation? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
How many nets? null
How many tansponders? null
Will you be using Ultra-short baseline (USBL) navigation?no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Will you be using Doppler/GPS navigation? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
What type of samples do you expect to collect?Sediment, carbonates, animals (maybe), fluids (IGT's) and majors
- added Sediment, carbonates, animals (maybe), fluids (IGT's) and majors on Jul 18, 2019 11:12 AM by Sarah Fuller

Elevators

Will you be using elevators to transport samples to the surface?yes
- changed from no to yes on Jul 19, 2019 1:17 PM by Eric Benway
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
If yes, how many would you anticipate? perhaps would like to have it onboard, but may not use
- added perhaps would like to have it onboard, but may not use on Jul 18, 2019 11:12 AM by Sarah Fuller

Science Supplied Equipment

Are you supplying equipment to be used on HOV Jason yes
- added yes on Jul 18, 2019 11:12 AM by Sarah Fuller
Has this equipment been used on Jason before? yes
- added yes on Jul 18, 2019 11:12 AM by Sarah Fuller
Please give a brief description of the equipment, its intended purpose, the cruise # it was last used on if any and its deployment method.
We will supply the IGT gas-tight samplers - will have been used on AT42-12 Regional Cabled Array cruise
- added We will supply the IGT gas-tight samplers - will have been used on AT42-12 Regional Cabled Array cruise on Jul 18, 2019 11:12 AM by Sarah Fuller
Does this equipment use an external pressure housing? yes
- added yes on Jul 18, 2019 11:12 AM by Sarah Fuller
If yes, what is the pressure rating?
and test pressure?
Has the pressure housing been tested per Alvin Pressure Test requirements? yes
- added yes on Jul 18, 2019 11:12 AM by Sarah Fuller
Pressure housing schematic with dimensions and include air and water weights.
Does the equipment have an associated computer or control panel for remote operation from the personnel sphere? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Air weight of this equipment?
Water weight of this equipment?
Does the equipment require data or a power interface from the vehicle? yes
- added yes on Jul 18, 2019 11:12 AM by Sarah Fuller
Does this equipment require hydraulic inputs from the vehicle? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Hydraulic schematic of the equipment requirements.
Does this equipment require manipulation? yes
- added yes on Jul 18, 2019 11:12 AM by Sarah Fuller
If yes, please describe how the equipment is to be manipulated:
Placement of nozzle in seep sites
- added Placement of nozzle in seep sites on Jul 18, 2019 11:12 AM by Sarah Fuller
Will this equipment be deployed off the vehicle? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
If yes, please describe how the equipment is intended for deployment:
No only includes placement by the manipulator into the sampling site
- added No only includes placement by the manipulator into the sampling site on Jul 18, 2019 11:12 AM by Sarah Fuller
If yes, will the equipment be disconnected from the vehicle and left in situ? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
How long will the deployment be?
Will the equipment be recovered by the same vehicle? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
If recovering equipment deployed with another vehicle, provide pressure rating:
and test pressure:
Does this equipment use any glass spheres for either buoyancy or as pressure housings? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller

Hazardous Material

Will hazardous material be utilized?no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Describe deployment method and quantity:

Additional Information

Brief operations description or comments:

Scientific Instrumentation for AUV Sentry


Current Chart(s):

What type of samples do you expect to collect?Only geophysical data and imagery
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller

Site Survey

Will you provide detailed charts of the work area(s)?yes
- added yes on Jul 18, 2019 11:12 AM by Sarah Fuller
If no, willl you need R/V Atlantis to generate maps of the work area(s)?no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Will you need post-dive maps of the work area generated?no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller

Navigation

Will you be using Long Base Line (LBL) navigation? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
How many nets? null
How many tansponders? null
Will you be using Ultra-short baseline (USBL) navigation?no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Will you be using Doppler/GPS navigation? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
- added Only geophysical data and imagery on Jul 18, 2019 11:12 AM by Sarah Fuller

Science Supplied Equipment

Are you supplying equipment to be used on HOV AbeSentry no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Has this equipment been used on AbeSentry before? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Please give a brief description of the equipment, its intended purpose, the cruise # it was last used on if any and its deployment method.
Does this equipment use an external pressure housing? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Has the pressure case been tested to the anticipated depth of deployment?& no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller
Pressure housing schematic with dimensions and include air and water weights.
Air weight of this equipment?
Water weight of this equipment?
Does the equipment require data or a power interface from the vehicle? no
Does the equipment meet the electrical requirements of the Sentry User Manual? no
- added no on Jul 18, 2019 11:12 AM by Sarah Fuller

Additional Information

Brief operations description or comments:

Checklist & Notes

Checklist

U.S. Customs Form: no
Diplomatic Clearance: no
Date Submitted:
Date Approved:
Agent Information:
Countries:
Notes:
Isotope Use Approval: no
Isotope Notes:
SCUBA Diving: no

Checklist

SSSG Tech: