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Genesis of Volcanic Rocks, Heard Island Entry ID: ASAC_400 |
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Summary
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Abstract:
Metadata record for data from ASAC Project 400 See the link below for public details on this project. Taken from one of the referenced papers: Oceanic basalts are produced by melting of the Earth's mantle and are widely used to probe its composition. The observation of systematic, coupled variations in the neodymium, strontium and lead isotopic compositions of these basalts has been widely interpreted as reflecting the mixing of identifiable mantle components. White and Zindler and Hart have suggested that the isotopic compositions of mid-ocean-ridge and ocean island basalts (MORB and OIB) can be considered as mixtures of a depleted MORB-type mantle component with a few other components reflecting long-term enrichment of Rb/Sr, Nd/Sm and/or U/Pb ratios. It remains unclear whether these components should be considered as hypothetical mixing endmembers, or whether they exist physically as mantle reservoirs. This question may be addressed if the mixing endmembers of individual mantle plumes can be identified. To this end, we report linear Pb-Pb and curvilinear Pb-Nd and Pb-Sr isotopic covariations in Recent lavas of Heard Island, southern Indian Ocean, indicating binary mixing. The hyperbolic relationships are unique among oceanic basalts and tightly constrain the isotopic compositions of the plume source components, which do not coincide with the mantle endmember components of ref. 3. If our results are generally applicable to other plumes, they call into question the existence of large mantle reservoirs corresponding to these components, and indicate that actual oceanic basalt source reservoirs have intermediate isotopic compositions. |
Related URL
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Link:
VIEW PROJECT HOME PAGE
Description: Public information for ASAC project 400 Link: VIEW RELATED INFORMATION Description: Download point for the data - pdf file Link: VIEW RELATED INFORMATION Description: Citation reference for this metadata record and dataset |
Geographic Coverage
| N: -53.0 | S: -54.0 | E: 73.0 | W: 72.0 |
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Temporal Coverage
| Start Date: 1986-09-30 |
| Stop Date: 1995-03-31 |
Location Keywords
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OCEAN
> SOUTHERN OCEAN
GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN > HEARD AND MCDONALD ISLANDS |
Science Keywords
| SOLID EARTH >ROCKS/MINERALS/CRYSTALS >IGNEOUS ROCKS [Definition] |
| SOLID EARTH >TECTONICS >VOLCANIC ACTIVITY >ERUPTION DYNAMICS >LAVA COMPOSITION/TEXTURE [Definition] |
ISO Topic Category
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GEOSCIENTIFIC INFORMATION
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Quality
| Values provided in temporal and spatial coverage are approximate only. |
Access Constraints
| A pdf copy of one of the referenced papers is available for download from the provided URL. |
Use Constraints
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This data set conforms to the PICCCBY Attribution License (http://creativecommons.org/licenses/by/3.0/). Please follow instructions listed in the citation reference at the provided URL when using these data. |
Keywords
| Heard Island |
| mantle |
| lava |
| reservoir |
| basalt |
Data Set Progress
| COMPLETE |
Data Center
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Australian Antarctic Data Centre, Australia
[Information]
Data Center URL: http://data.aad.gov.au
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Distribution
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Distribution_Media:
HTTP
Distribution_Size: 1,298 kb Distribution_Format: pdf Fees: free |
Personnel
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IAN
NICHOLLS Role: INVESTIGATOR Role: TECHNICAL CONTACT Phone: +61 3 9905 4894 Email: ian.nicholls at sci.monash.edu.au Contact Address: Department of Earth Sciences Monash University City: Clayton Province or State: Victoria Postal Code: 3168 Country: Australia |
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DAVE
CONNELL Role: DIF AUTHOR Phone: +61 3 6232 3244 Fax: +61 3 6232 3351 Email: dave.connell at aad.gov.au Contact Address: Australian Antarctic Division 203 Channel Highway City: Kingston Province or State: Tasmania Postal Code: 7050 Country: Australia |
Publications/References
Barling J., Goldstein S.L. (1990) Extreme isotopic variations in Heard Island lavas and the nature of mantle reservoirs. Nature 348. 59
Barling J. (1990) Heard and McDonald Islands. Volcanoes of the Antarctic Plate and Southern Oceans 48. 435-441
Barling J. (1990) The Petrogenesis of the Newer Lavas of Heard Island, Southern Indian Ocean;
Barling J. (1990) Heard and McDonald Islands. Volcanoes of the Antarctic Plate and Southern Oceans 48. 435-441
Barling J. (1990) The Petrogenesis of the Newer Lavas of Heard Island, Southern Indian Ocean;
Creation and Review Dates
DIF Creation Date:
2000-10-12
Last DIF Revision Date:
2010-07-26
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