Abstract:
Dredging for rock samples was conducted in the West Scotia Sea during James Clark Ross cruise no JR77 between Feb and Mar 2004. The aim was to acquire rock samples to constrain the history of the mantle beneath the Scotia Sea, from which the oceanic crust was derived by melting. Twenty days of rock dredging were conducted at fourteen sites in five main areas. Thirteen dredges were successful in recovering oceanic rocks of mixed sizes, up to and including very large boulders and dredge paths of up to 1 km were followed. The cruise also (remarkably) recovered fresh mantle peridotite nodules from the West Scotia Ridge, the first of its type - to our knowledge - from the world's ocean ridge system.
Keywords:
axil rift, dredge, global upper mantle fluxes, mantle domain boundary, mantle flow, mantle provenance, oceanic rock, peridotite, spreading centre
| Access Constraints: | Requests for data can be made via the UK Polar Data Centre (UK PDC) at BAS. |
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| Use Constraints: | This data is governed by the NERC Data Policy. |
| Creation Date: | 2007-08-24 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Dr Tiffany Barry |
| Role(s) | Investigator |
| Organisation | The Open University |
| Name | Dr P Leat |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr I Millar |
| Role(s) | Investigator |
| Organisation | British Geological Survey |
| Name | Prof J Pearce |
| Role(s) | Investigator |
| Organisation | University of Cardiff |
| Parent Dataset: | N/A |
| Reference: | Pearce, J.A. & Stern, R.J., 2006. The origin of back-arc basin magmas: trace element and isotope perspectives. AGU Geophys. Monograph Series, 166, 63-86 Pearce J.A. 2005. Mantle Preconditioning by Melt Extraction during Flow: Theory and Petrogenetic Implications. J. Petrol. 48 , 973-998. Barry, T.L., Pearce, J.A., Leat, P.T., Millar, I.L. and A.P. le Roex. Hf isotope evidence for selective mobility of high-field-strength elements in a subduction setting: South Sandwich Islands. Earth and Planetary Science Letters, 252, 223-244. Barry, T.L., Pearce, J.A., Leat, P.T. and Millar, I.L. 2005. Some isotopic constraints on fluid versus melt transfer from slab to wedge: Hf isotope evidence from the South Sandwich Arc. Geochim. Cosmochim. Acta, 69, A634-A634. Leat, P.T., Pearce, J.A., Barker, P.F., Millar, I.L. and Larter, R.D. 2004. Magma genesis and mantle flow at a subducting slab edge: the South Sandwich arc-basin system. Earth and Planetary Science Letters, 227, 17-35. Pearce, J.A., Stern, R.J., Barry, T.L., Leat, P.T. and Millar, I.L. 2004. Geochemical tracing of mantle flow above subduction zones. EOS Trans. Amer. Geophys. Union, 80 (47), T23D-02. Leat, P.T., Pearce, J.A., Livermore, R. and Morris, P. 2004. Cruise Report: JR77 & JR78. AFI project no: AFI 02/36 Geochemical Tracing of Pacific-to-Atlantic Mantle Flow through the Drake Passage/Scotia Sea Gateway |
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| Lineage: | The dredge rig equipment and method of deployment is described in the Cruise Report. | |
| Temporal Coverage: | |
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| Start Date | 2004-02-19 |
| End Date | 2004-03-03 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -58 |
| Northernmost | -54 |
| Longitude | |
| Westernmost | -55 |
| Easternmost | -40 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Southern Ocean |
| Detailed Location | Drake Passage |
| Location | Southern Ocean |
| Detailed Location | Burdwood Fracture Zone |
| Location | Southern Ocean |
| Detailed Location | Scotia Sea |
| Location | Southern Ocean |
| Detailed Location | Lost Fracture Zone |
| Location | Southern Ocean |
| Detailed Location | Endurance Fracture Zone |
| Location | Southern Ocean |
| Detailed Location | Quest Fracture Zone |
| Data Storage: | This data are managed by the UK Polar Data Centre (UK PDC) Geological Data Manager and held in the rock store. The data analysis associated with this dataset is also managed by the Geological Data Manager. The geophysical data held for this and the linked datasets is: Multibeam swath bathymetry data, raw, processed and xyz formats, with a total storage of 17.6Gb, and TOPAS sub-bottom profiler data, 3Gb. |
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