Abstract:
Geochemical analysis of rock samples acquired by dredging activities in the Scotia Sea between Feb and Mar 2004 aboard James Clark Ross (cruise no JR77).
The initial aim of this project was to carry out a higher resolution geochemical study of mantle flow using existing samples. This confirmed flow from the Bouvet domain into the East Scotia Sea and placed constraints on flow pathways. The second stage was to sample further within the West Scotia Sea and to use elemental and isotope (Sr, Nd, Pb, Hf) analyses to fingerprint mantle provenance. The results were used to locate and investigate the nature of the Pacific-South Atlantic mantle domain boundary and thus to contribute to the understanding and quantification of global upper mantle fluxes.
Keywords:
axial rift, global upper mantle fluxes, mantle domain boundary, mantle flow, oceanic rock, 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: | Data released under Open Government Licence V3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ |
| 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 | Prof J Pearce |
| Role(s) | Investigator |
| Organisation | University of Cardiff |
| Name | Dr P Leat |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr I Millar |
| Role(s) | Investigator |
| Organisation | British Geological Survey |
| Name | Dr Tiffany Barry |
| Role(s) | Investigator |
| Organisation | The Open University |
| 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: | ||
| Temporal Coverage: | |
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| Start Date | 2001-10-01 |
| End Date | 2005-09-30 |
| 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 |
| Distribution: | |
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| Distribution Media | Online FTP |
| Distribution Size | N/A |
| Distribution Format | N/A |
| Fees | See Natural Environment Research Council (NERC) Data Policy |
| Data Storage: | This data is managed by the UK Polar Data Centre (UK PDC) Geological Data Manager at BAS, and held on the BAS Storage Area Network (SAN). 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. |