BODC Cruise Metadata Report for RRS James Cook (740H) cruise JC007
Introduction
This report collates information from the BODC cruise inventory and oceanographic databases. It presents
- Cruise Inventory Information
- A summary of BODC data holdings for the cruise from the
- References - including cruise tracks and cruise reports
Cruise Inventory Information
| Long name | RRS James Cook (740H) cruise JC007 |
|---|---|
| Short name | JC007 |
| Objectives and Narrative |
The three key objectives of our original proposal were to test:
1. The hypothesis that mantle upwelling and melting is focused at the centres of slow spreading ridge segments and transposed by sub-horizontal flow away from there. 2. The hypothesis that plate accretion and separation mechanisms are fundamentally different in 'magma-starved' areas. 3. Mechanisms of detachment faulting and extensional strain localisation in the lower crust and upper mantle. We proposed to achieve these objectives by detailed surveying and sampling across an extensive region of magma-poor seafloor spreading around Fifteen Twenty Fracture Zone (FTFZ), coupled with microstructural, geochemical and palaeomagnetic analyses. TOBI deep-towed sidescan and magnetic data were to be obtained both to inform the choice of sampling sites and to aid in structural, lithological and geodynamic interpretations. We spent 29 days on the Mid-Atlantic Ridge (MAR) in the vicinity of 13 to 15N. We collected multibeam ship-based bathymetry, gravity and magnetic data and TOBI sidescan, magnetic and water-column data from a total area of about 8,000 km2. We recovered samples from 47 drill and dredge stations throughout the area, in support of the objectives. |
| Ship | RRS James Cook |
| Departure Port | Santa Cruz de Tenerife, Spain |
| Departure Date | 2007-03-05 |
| Arrival Port | Santa Cruz de Tenerife, Spain |
| Arrival Date | 2007-04-17 |
| Principal Scientist(s) | Roger C Searle (University of Durham, Department of Earth Sciences) |
| Responsible Organisation | University of Durham, Department of Earth Sciences |
| Associated Project(s) | |
| IHB Sea Areas Visited | North Atlantic Ocean |
| Marsden Squares Visited | 40/41/74/75/76 |
| Work Area Description | Tropical North Atlantic |
| Unable to lookup cruise bounds at this time | |
| Work Area Bounding Polygon | |
| Southern Limit | unknown |
| Northern Limit | unknown |
| Western Limit | unknown |
| Eastern Limit | unknown |
Cruise Inventory Datasets
| Physical oceanography | |
|---|---|
| Subsurface temperature and salinity measurements |
Quantity:
activity duration in days =
11
Description: TOBI deep-towed continuous CTD measurements |
| Geology and geophysics | |
| Core - rock |
Quantity:
number of cores =
7
Description: 7 oriented 8 unoriented rock cores using BGS oriented rock drill (''BRIDGE" drill) |
| Dredge |
Quantity:
number of hauls =
30
Description: Dredge hauls recovering a variety of rock types |
| Geophysical measurements made at depth |
Quantity:
activity duration in days =
11
Description: TOBI deep-towed continuous 3-component magnetic field data |
| Gravity measurements |
Quantity:
activity duration in days =
42
Description: Continuous gravity measurements with LaCoste & Romberg marine meter S-75, tied to Earth Gravity Network stations in Tenerife |
| Long/short range side scan sonar |
Quantity:
activity duration in days =
11
Description: TOBI deep-towed 30 kHz sidescan sonar, 6 km swath width |
| Magnetic measurements |
Quantity:
activity duration in days =
20
Description: Continuous measurements on passage and in survey area |
| Multi-beam echosounding |
Quantity:
activity duration in days =
40
Description: Simrad EM120 multibeam echosounding, depth and backscatter data. |
Cruise Inventory Mooring/Buoy Operations
No information on datasets is currently available
Summary of BODC Data Holdings for the Cruise
National Oceanographic Database
No data currently held for this cruise in the BODC National Oceanographic Database
Project Database
No data currently held for this cruise in the BODC Project Database
